/************************************************************************** * files.c * * * * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, * * 2008, 2009, 2010, 2011, 2013, 2014 Free Software Foundation, Inc. * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 3, or (at your option) * * any later version. * * * * This program is distributed in the hope that it will be useful, but * * WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * * General Public License for more details. * * * * You should have received a copy of the GNU General Public License * * along with this program; if not, write to the Free Software * * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * * 02110-1301, USA. * * * **************************************************************************/ #include "proto.h" #include #include #include #include #include #include #include #include #include #define LOCKBUFSIZE 8192 /* Verify that the containing directory of the given filename exists. */ bool has_valid_path(const char *filename) { char *namecopy = mallocstrcpy(NULL, filename); char *parentdir = dirname(namecopy); struct stat parentinfo; bool validity = FALSE; if (stat(parentdir, &parentinfo) == -1) { if (errno == ENOENT) statusline(ALERT, _("Directory '%s' does not exist"), parentdir); else statusline(ALERT, _("Path '%s': %s"), parentdir, strerror(errno)); } else if (!S_ISDIR(parentinfo.st_mode)) statusline(ALERT, _("Path '%s' is not a directory"), parentdir); else if (access(parentdir, X_OK) == -1) statusline(ALERT, _("Path '%s' is not accessible"), parentdir); else validity = TRUE; free(namecopy); return validity; } /* Add an entry to the circular list of openfile structs. */ void make_new_buffer(void) { if (openfile == NULL) { openfile = make_new_opennode(); /* Make the first open file the only element in the list. */ openfile->prev = openfile; openfile->next = openfile; } else { openfilestruct *newnode = make_new_opennode(); /* Add the new open file after the current one in the list. */ newnode->prev = openfile; newnode->next = openfile->next; openfile->next->prev = newnode; openfile->next = newnode; /* Make the new file the current one. */ openfile = newnode; /* There is more than one file open: show Close in help lines. */ exitfunc->desc = close_tag; } /* Start initializing the new buffer. */ openfile->filename = mallocstrcpy(NULL, ""); initialize_buffer_text(); openfile->current_x = 0; openfile->placewewant = 0; openfile->current_y = 0; openfile->modified = FALSE; #ifndef NANO_TINY openfile->mark_set = FALSE; openfile->mark_begin = NULL; openfile->mark_begin_x = 0; openfile->fmt = NIX_FILE; openfile->undotop = NULL; openfile->current_undo = NULL; openfile->last_action = OTHER; openfile->current_stat = NULL; openfile->lock_filename = NULL; #endif #ifndef DISABLE_COLOR openfile->syntax = NULL; openfile->colorstrings = NULL; #endif } /* Initialize the text of the current openfile struct. */ void initialize_buffer_text(void) { assert(openfile != NULL); openfile->fileage = make_new_node(NULL); openfile->fileage->data = mallocstrcpy(NULL, ""); openfile->filebot = openfile->fileage; openfile->edittop = openfile->fileage; openfile->current = openfile->fileage; openfile->totsize = 0; } /* Mark the current file as modified if it isn't already, and then * update the titlebar to display the file's new status. */ void set_modified(void) { if (openfile->modified) return; openfile->modified = TRUE; titlebar(NULL); #ifndef NANO_TINY if (!ISSET(LOCKING) || openfile->filename[0] == '\0') return; if (openfile->lock_filename == NULL) { /* TRANSLATORS: Keep the next two messages at most 76 characters. */ statusbar(_("Warning: Modifying a file which is not locked," " check directory permission?")); } else { char *fullname = get_full_path(openfile->filename); write_lockfile(openfile->lock_filename, fullname, TRUE); free(fullname); } #endif } #ifndef NANO_TINY /* Actually write the lockfile. This function will ALWAYS annihilate * any previous version of the file. We'll borrow INSECURE_BACKUP here * to decide about lockfile paranoia here as well... * * Args: * lockfilename: file name for lock * origfilename: name of the file the lock is for * modified: whether to set the modified bit in the file * * Returns: 1 on success, 0 on failure (but continue loading), -1 on * failure and abort. */ int write_lockfile(const char *lockfilename, const char *origfilename, bool modified) { int cflags, fd; FILE *filestream; pid_t mypid; uid_t myuid; struct passwd *mypwuid; struct stat fileinfo; char *lockdata = charalloc(1024); char myhostname[32]; ssize_t lockdatalen = 1024; ssize_t wroteamt; /* Run things which might fail first before we try and blow away the * old state. */ myuid = geteuid(); if ((mypwuid = getpwuid(myuid)) == NULL) { statusbar(_("Couldn't determine my identity for lock file (getpwuid() failed)")); goto free_and_fail; } mypid = getpid(); if (gethostname(myhostname, 31) < 0) { if (errno == ENAMETOOLONG) myhostname[31] = '\0'; else { statusline(HUSH, _("Couldn't determine hostname for lock file: %s"), strerror(errno)); goto free_and_fail; } } /* Check if the lock exists before we try to delete it...*/ if (stat(lockfilename, &fileinfo) != -1) if (delete_lockfile(lockfilename) < 0) goto free_and_fail; if (ISSET(INSECURE_BACKUP)) cflags = O_WRONLY | O_CREAT | O_APPEND; else cflags = O_WRONLY | O_CREAT | O_EXCL | O_APPEND; fd = open(lockfilename, cflags, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); /* Maybe we just don't have write access. Print an error message * and continue. */ if (fd < 0) { statusline(HUSH, _("Error writing lock file %s: %s"), lockfilename, strerror(errno)); free(lockdata); return 0; } /* Now we've got a safe file stream. If the previous open() call * failed, this will return NULL. */ filestream = fdopen(fd, "wb"); if (fd < 0 || filestream == NULL) { statusline(HUSH, _("Error writing lock file %s: %s"), lockfilename, strerror(errno)); goto free_and_fail; } /* Okay, so at the moment we're following this state for how to * store the lock data: * * byte 0 - 0x62 * byte 1 - 0x30 * bytes 2-12 - program name which created the lock * bytes 24,25 - little endian store of creator program's PID * (b24 = 256^0 column, b25 = 256^1 column) * bytes 28-44 - username of who created the lock * bytes 68-100 - hostname of where the lock was created * bytes 108-876 - filename the lock is for * byte 1007 - 0x55 if file is modified * * Looks like VIM also stores undo state in this file, so we're * gonna have to figure out how to slap a 'OMG don't use recover on * our lockfile' message in here... * * This is likely very wrong, so this is a WIP. */ memset(lockdata, 0, lockdatalen); lockdata[0] = 0x62; lockdata[1] = 0x30; lockdata[24] = mypid % 256; lockdata[25] = mypid / 256; snprintf(&lockdata[2], 11, "nano %s", VERSION); strncpy(&lockdata[28], mypwuid->pw_name, 16); strncpy(&lockdata[68], myhostname, 31); strncpy(&lockdata[108], origfilename, 768); if (modified == TRUE) lockdata[1007] = 0x55; wroteamt = fwrite(lockdata, sizeof(char), lockdatalen, filestream); if (wroteamt < lockdatalen) { statusline(HUSH, _("Error writing lock file %s: %s"), lockfilename, ferror(filestream)); goto free_and_fail; } #ifdef DEBUG fprintf(stderr, "In write_lockfile(), write successful (wrote %lu bytes)\n", (unsigned long)wroteamt); #endif if (fclose(filestream) == EOF) { statusline(HUSH, _("Error writing lock file %s: %s"), lockfilename, strerror(errno)); goto free_and_fail; } openfile->lock_filename = (char *) lockfilename; free(lockdata); return 1; free_and_fail: free(lockdata); return -1; } /* Less exciting, delete the lockfile. Return -1 if unsuccessful and * complain on the statusbar, 1 otherwise. */ int delete_lockfile(const char *lockfilename) { if (unlink(lockfilename) < 0 && errno != ENOENT) { statusline(HUSH, _("Error deleting lock file %s: %s"), lockfilename, strerror(errno)); return -1; } return 1; } /* Deal with lockfiles. Return -1 on refusing to override the lockfile, * and 1 on successfully creating it; 0 means we were not successful in * creating the lockfile but we should continue to load the file and * complain to the user. */ int do_lockfile(const char *filename) { char *namecopy = (char *) mallocstrcpy(NULL, filename); char *secondcopy = (char *) mallocstrcpy(NULL, filename); size_t locknamesize = strlen(filename) + strlen(locking_prefix) + strlen(locking_suffix) + 3; char *lockfilename = charalloc(locknamesize); static char lockprog[11], lockuser[17]; struct stat fileinfo; int lockfd, lockpid, retval = -1; snprintf(lockfilename, locknamesize, "%s/%s%s%s", dirname(namecopy), locking_prefix, basename(secondcopy), locking_suffix); free(secondcopy); #ifdef DEBUG fprintf(stderr, "lock file name is %s\n", lockfilename); #endif if (stat(lockfilename, &fileinfo) != -1) { ssize_t readtot = 0; ssize_t readamt = 0; char *lockbuf, *question, *promptstr; int room, ans; if ((lockfd = open(lockfilename, O_RDONLY)) < 0) { statusline(HUSH, _("Error opening lock file %s: %s"), lockfilename, strerror(errno)); goto free_the_name; } lockbuf = charalloc(LOCKBUFSIZE); do { readamt = read(lockfd, &lockbuf[readtot], LOCKBUFSIZE - readtot); readtot += readamt; } while (readamt > 0 && readtot < LOCKBUFSIZE); if (readtot < 48) { statusline(HUSH, _("Error reading lock file %s: " "Not enough data read"), lockfilename); free(lockbuf); goto free_the_name; } strncpy(lockprog, &lockbuf[2], 10); lockpid = (unsigned char)lockbuf[25] * 256 + (unsigned char)lockbuf[24]; strncpy(lockuser, &lockbuf[28], 16); free(lockbuf); #ifdef DEBUG fprintf(stderr, "lockpid = %d\n", lockpid); fprintf(stderr, "program name which created this lock file should be %s\n", lockprog); fprintf(stderr, "user which created this lock file should be %s\n", lockuser); #endif /* TRANSLATORS: The second %s is the name of the user, the third that of the editor. */ question = _("File %s is being edited (by %s with %s, PID %d); continue?"); room = COLS - strlenpt(question) - strlenpt(lockuser) - strlenpt(lockprog) + 3; if (room < 4) namecopy = mallocstrcpy(namecopy, "_"); else if (room < strlenpt(filename)) sprintf(namecopy, "...%s", display_string(filename, strlenpt(filename) - room + 3, room, FALSE)); /* Allow extra space for username (14), program name (8), PID (3), * and terminating \0 (1), minus the %s (2) for the file name. */ promptstr = charalloc(strlen(question) + 24 + strlen(namecopy)); sprintf(promptstr, question, namecopy, lockuser, lockprog, lockpid); ans = do_yesno_prompt(FALSE, promptstr); free(promptstr); if (ans < 1) { blank_statusbar(); goto free_the_name; } } retval = write_lockfile(lockfilename, filename, FALSE); free_the_name: free(namecopy); if (retval < 1) free(lockfilename); return retval; } /* Perform a stat call on the given filename, allocating a stat struct * if necessary. On success, *pstat points to the stat's result. On * failure, *pstat is freed and made NULL. */ void stat_with_alloc(const char *filename, struct stat **pstat) { if (*pstat == NULL) *pstat = (struct stat *)nmalloc(sizeof(struct stat)); if (stat(filename, *pstat) != 0) { free(*pstat); *pstat = NULL; } } #endif /* !NANO_TINY */ /* If it's not "", filename is a file to open. We make a new buffer, if * necessary, and then open and read the file, if applicable. */ bool open_buffer(const char *filename, bool undoable) { bool new_buffer = (openfile == NULL #ifndef DISABLE_MULTIBUFFER || ISSET(MULTIBUFFER) #endif ); /* Whether we load into this buffer or a new one. */ char *realname; /* The filename after tilde expansion. */ FILE *f; int rc; /* rc == -2 means that we have a new file. -1 means that the * open() failed. 0 means that the open() succeeded. */ assert(filename != NULL); #ifndef DISABLE_OPERATINGDIR if (check_operating_dir(filename, FALSE)) { statusline(ALERT, _("Can't insert file from outside of %s"), operating_dir); return FALSE; } #endif realname = real_dir_from_tilde(filename); /* When the specified filename is not empty, and the thing exists, * verify that it is a normal file. */ if (strcmp(filename, "") != 0) { struct stat fileinfo; if (stat(realname, &fileinfo) == 0 && !S_ISREG(fileinfo.st_mode)) { if (S_ISDIR(fileinfo.st_mode)) statusline(ALERT, _("\"%s\" is a directory"), realname); else statusline(ALERT, _("\"%s\" is not a normal file"), realname); free(realname); return FALSE; } } /* If we're going to load into a new buffer, first create the new * buffer and (if possible) lock the corresponding file. */ if (new_buffer) { make_new_buffer(); if (has_valid_path(realname)) { #ifndef NANO_TINY if (ISSET(LOCKING) && filename[0] != '\0') { if (do_lockfile(realname) < 0) { #ifndef DISABLE_MULTIBUFFER if (openfile->next) { close_buffer(); free(realname); return FALSE; } #endif } } #endif /* !NANO_TINY */ } } /* If the filename isn't blank, and we are not in NOREAD_MODE, * open the file. Otherwise, treat it as a new file. */ rc = (filename[0] != '\0' && !ISSET(NOREAD_MODE)) ? open_file(realname, new_buffer, FALSE, &f) : -2; /* If we have a file, and we're loading into a new buffer, update * the filename. */ if (rc != -1 && new_buffer) openfile->filename = mallocstrcpy(openfile->filename, realname); /* If we have a non-new file, read it in. Then, if the buffer has * no stat, update the stat, if applicable. */ if (rc > 0) { read_file(f, rc, realname, undoable, new_buffer); #ifndef NANO_TINY if (openfile->current_stat == NULL) stat_with_alloc(realname, &openfile->current_stat); #endif } /* If we have a file, and we're loading into a new buffer, move back * to the beginning of the first line of the buffer. */ if (rc != -1 && new_buffer) { openfile->current = openfile->fileage; openfile->current_x = 0; openfile->placewewant = 0; } #ifndef DISABLE_COLOR /* If we're loading into a new buffer, update the colors to account * for it, if applicable. */ if (new_buffer) color_update(); #endif free(realname); return TRUE; } #ifndef DISABLE_SPELLER /* Open the specified file, and if that succeeds, blow away the text of * the current buffer and read the file contents into its place. */ void replace_buffer(const char *filename) { FILE *f; int descriptor; assert(filename != NULL && filename[0] != '\0'); /* Open the file quietly. */ descriptor = open_file(filename, FALSE, TRUE, &f); /* If opening failed, forget it. */ if (descriptor < 0) return; /* Reinitialize the text of the current buffer. */ free_filestruct(openfile->fileage); initialize_buffer_text(); /* Insert the processed file into its place. */ read_file(f, descriptor, filename, FALSE, TRUE); /* Put current at a place that is certain to exist. */ openfile->current = openfile->fileage; } #endif /* !DISABLE_SPELLER */ /* Update the screen to account for the current buffer. */ void display_buffer(void) { /* Update the titlebar, since the filename may have changed. */ titlebar(NULL); #ifndef DISABLE_COLOR /* Make sure we're using the buffer's associated colors. */ color_init(); /* If there are multiline coloring regexes, and there is no * multiline cache data yet, precalculate it now. */ if (openfile->syntax && openfile->syntax->nmultis > 0 && openfile->fileage->multidata == NULL) precalc_multicolorinfo(); #endif /* Update the edit window. */ edit_refresh(); } #ifndef DISABLE_MULTIBUFFER /* Switch to a neighbouring file buffer; to the next if to_next is TRUE; * otherwise, to the previous one. */ void switch_to_prevnext_buffer(bool to_next) { assert(openfile != NULL); /* If only one file buffer is open, say so and get out. */ if (openfile == openfile->next) { statusbar(_("No more open file buffers")); return; } /* Switch to the next or previous file buffer. */ openfile = to_next ? openfile->next : openfile->prev; #ifdef DEBUG fprintf(stderr, "filename is %s\n", openfile->filename); #endif /* Update the screen to account for the current buffer. */ display_buffer(); /* Indicate the switch on the statusbar. */ statusline(HUSH, _("Switched to %s"), ((openfile->filename[0] == '\0') ? _("New Buffer") : openfile->filename)); #ifdef DEBUG dump_filestruct(openfile->current); #endif display_main_list(); } /* Switch to the previous entry in the openfile filebuffer. */ void switch_to_prev_buffer_void(void) { switch_to_prevnext_buffer(FALSE); } /* Switch to the next entry in the openfile filebuffer. */ void switch_to_next_buffer_void(void) { switch_to_prevnext_buffer(TRUE); } /* Delete an entry from the circular list of open files, and switch to the * one after it. Return TRUE on success, and FALSE if there are no other * open buffers. */ bool close_buffer(void) { assert(openfile != NULL); /* If only one file buffer is open, get out. */ if (openfile == openfile->next) return FALSE; #ifndef DISABLE_HISTORIES if (ISSET(POS_HISTORY)) update_poshistory(openfile->filename, openfile->current->lineno, xplustabs() + 1); #endif /* Switch to the next file buffer. */ switch_to_prevnext_buffer(TRUE); /* Close the file buffer we had open before. */ unlink_opennode(openfile->prev); /* If only one buffer is open now, show Exit in the help lines. */ if (openfile == openfile->next) exitfunc->desc = exit_tag; return TRUE; } #endif /* !DISABLE_MULTIBUFFER */ /* A bit of a copy and paste from open_file(), is_file_writable() just * checks whether the file is appendable as a quick permissions check, * and we tend to err on the side of permissiveness (reporting TRUE when * it might be wrong) to not fluster users editing on odd filesystems by * printing incorrect warnings. */ int is_file_writable(const char *filename) { struct stat fileinfo, fileinfo2; int fd; FILE *f; char *full_filename; bool ans = TRUE; if (ISSET(VIEW_MODE)) return TRUE; assert(filename != NULL); /* Get the specified file's full path. */ full_filename = get_full_path(filename); /* Okay, if we can't stat the absolute path due to some component's * permissions, just try the relative one. */ if (full_filename == NULL || (stat(full_filename, &fileinfo) == -1 && stat(filename, &fileinfo2) != -1)) full_filename = mallocstrcpy(NULL, filename); if ((fd = open(full_filename, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)) == -1 || (f = fdopen(fd, "a")) == NULL) ans = FALSE; else fclose(f); close(fd); free(full_filename); return ans; } /* Make a new line of text from the given buf, which is of length buf_len. * Then attach this line after prevnode. */ filestruct *read_line(char *buf, size_t buf_len, filestruct *prevnode) { filestruct *freshline = (filestruct *)nmalloc(sizeof(filestruct)); /* Convert nulls to newlines. buf_len is the string's real length. */ unsunder(buf, buf_len); buf[buf_len] = '\0'; assert(openfile->fileage != NULL && strlen(buf) == buf_len); #ifndef NANO_TINY /* If file conversion isn't disabled, strip a '\r' from the line. */ if (buf_len > 0 && buf[buf_len - 1] == '\r' && !ISSET(NO_CONVERT)) buf[buf_len - 1] = '\0'; #endif freshline->data = mallocstrcpy(NULL, buf); #ifndef DISABLE_COLOR freshline->multidata = NULL; #endif freshline->prev = prevnode; if (prevnode == NULL) { /* Special case: we're inserting into the first line. */ freshline->next = openfile->fileage; openfile->fileage = freshline; freshline->lineno = 1; } else { prevnode->next = freshline; freshline->next = NULL; freshline->lineno = prevnode->lineno + 1; } return freshline; } /* Read an open file into the current buffer. f should be set to the * open file, and filename should be set to the name of the file. * undoable means do we want to create undo records to try and undo * this. Will also attempt to check file writability if fd > 0 and * checkwritable == TRUE. */ void read_file(FILE *f, int fd, const char *filename, bool undoable, bool checkwritable) { size_t num_lines = 0; /* The number of lines in the file. */ size_t len = 0; /* The length of the current line of the file. */ size_t bufx = MAX_BUF_SIZE; /* The size of each chunk of the file that we read. */ char input = '\0'; /* The current input character. */ char *buf; /* The buffer where we store chunks of the file. */ filestruct *fileptr = openfile->current->prev; /* The line after which to start inserting. */ int input_int; /* The current value we read from the file, whether an input * character or EOF. */ bool writable = TRUE; /* Is the file writable (if we care) */ #ifndef NANO_TINY int format = 0; /* 0 = *nix, 1 = DOS, 2 = Mac, 3 = both DOS and Mac. */ #endif assert(openfile->fileage != NULL && openfile->current != NULL); buf = charalloc(bufx); buf[0] = '\0'; #ifndef NANO_TINY if (undoable) add_undo(INSERT); #endif /* Read the entire file into the filestruct. */ while ((input_int = getc(f)) != EOF) { input = (char)input_int; /* If it's a *nix file ("\n") or a DOS file ("\r\n"), and file * conversion isn't disabled, handle it! */ if (input == '\n') { #ifndef NANO_TINY /* If it's a DOS file or a DOS/Mac file ('\r' before '\n' on * the first line if we think it's a *nix file, or on any * line otherwise), and file conversion isn't disabled, * handle it! */ if ((num_lines == 0 || format != 0) && !ISSET(NO_CONVERT) && len > 0 && buf[len - 1] == '\r') { if (format == 0 || format == 2) format++; } #endif /* Read in the line properly. */ fileptr = read_line(buf, len, fileptr); num_lines++; /* Reset the length in preparation for the next line. */ len = 0; #ifndef NANO_TINY /* If it's a Mac file ('\r' without '\n' on the first line if we * think it's a *nix file, or on any line otherwise), and file * conversion isn't disabled, handle it! */ } else if ((num_lines == 0 || format != 0) && !ISSET(NO_CONVERT) && len > 0 && buf[len - 1] == '\r') { /* If we currently think the file is a *nix file, set format * to Mac. If we currently think the file is a DOS file, * set format to both DOS and Mac. */ if (format == 0 || format == 1) format += 2; /* Read in the line properly. */ fileptr = read_line(buf, len, fileptr); num_lines++; /* Store the character after the \r as the first character * of the next line. */ buf[0] = input; len = 1; #endif } else { /* Store the character. */ buf[len] = input; /* Keep track of the total length of the line. It might have * nulls in it, so we can't just use strlen() later. */ len++; /* If needed, increase the buffer size, MAX_BUF_SIZE characters at * a time. Don't bother decreasing it; it is freed at the end. */ if (len == bufx) { bufx += MAX_BUF_SIZE; buf = charealloc(buf, bufx); } } } /* Perhaps this could use some better handling. */ if (ferror(f)) nperror(filename); fclose(f); if (fd > 0 && checkwritable) { close(fd); writable = is_file_writable(filename); } /* Did we not get a newline and still have stuff to do? */ if (len > 0) { #ifndef NANO_TINY /* If file conversion isn't disabled and the last character in * this file is '\r', set format to Mac if we currently think * the file is a *nix file, or to both DOS and Mac if we * currently think the file is a DOS file. */ if (buf[len - 1] == '\r' && !ISSET(NO_CONVERT) && format < 2) format += 2; #endif /* Read in the last line properly. */ fileptr = read_line(buf, len, fileptr); num_lines++; } free(buf); /* Attach the file we got to the filestruct. If we got a file of * zero bytes, don't do anything. */ if (num_lines > 0) { /* If the file we got doesn't end in a newline (nor in a Mac return), * tack its last line onto the beginning of the line at current. */ if (len > 0 && (input != '\r' || ISSET(NO_CONVERT))) { filestruct *dropline = fileptr; size_t current_len = strlen(openfile->current->data); /* Adjust the current x-coordinate to compensate for the * change in the current line. */ if (num_lines == 1) openfile->current_x += len; else openfile->current_x = len; /* Tack the text at fileptr onto the beginning of the text * at current. */ openfile->current->data = charealloc(openfile->current->data, len + current_len + 1); charmove(openfile->current->data + len, openfile->current->data, current_len + 1); strncpy(openfile->current->data, fileptr->data, len); /* Step back one line, and blow away the unterminated line, * since its text has been copied into current. */ fileptr = fileptr->prev; delete_node(dropline); } if (fileptr == NULL) /* After inserting a single unterminated line at the top, * readjust the top-of-file pointer. */ openfile->fileage = openfile->current; else { /* Attach the line at current after the line at fileptr. */ fileptr->next = openfile->current; openfile->current->prev = fileptr; } /* Renumber, starting with the last line of the file we inserted. */ renumber(openfile->current); } openfile->totsize += get_totsize(openfile->fileage, openfile->filebot); /* If the NO_NEWLINES flag isn't set, and text has been added to * the magicline (i.e. a file that doesn't end in a newline has been * inserted at the end of the current buffer), add a new magicline, * and move the current line down to it. */ if (!ISSET(NO_NEWLINES) && openfile->filebot->data[0] != '\0') { new_magicline(); openfile->current = openfile->filebot; openfile->current_x = 0; } /* Set the current place we want to the end of the last line of the * file we inserted. */ openfile->placewewant = xplustabs(); #ifndef NANO_TINY if (undoable) update_undo(INSERT); if (format == 3) { if (writable) statusline(HUSH, P_("Read %lu line (Converted from DOS and Mac format)", "Read %lu lines (Converted from DOS and Mac format)", (unsigned long)num_lines), (unsigned long)num_lines); else /* TRANSLATORS: Keep the next handful of messages at most 76 characters long. */ statusline(ALERT, P_("Read %lu line (Converted from DOS and Mac format - NO write permission)", "Read %lu lines (Converted from DOS and Mac format - NO write permission)", (unsigned long)num_lines), (unsigned long)num_lines); } else if (format == 2) { openfile->fmt = MAC_FILE; if (writable) statusline(HUSH, P_("Read %lu line (Converted from Mac format)", "Read %lu lines (Converted from Mac format)", (unsigned long)num_lines), (unsigned long)num_lines); else statusline(ALERT, P_("Read %lu line (Converted from Mac format - Warning: No write permission)", "Read %lu lines (Converted from Mac format - Warning: No write permission)", (unsigned long)num_lines), (unsigned long)num_lines); } else if (format == 1) { openfile->fmt = DOS_FILE; if (writable) statusline(HUSH, P_("Read %lu line (Converted from DOS format)", "Read %lu lines (Converted from DOS format)", (unsigned long)num_lines), (unsigned long)num_lines); else statusline(ALERT, P_("Read %lu line (Converted from DOS format - Warning: No write permission)", "Read %lu lines (Converted from DOS format - Warning: No write permission)", (unsigned long)num_lines), (unsigned long)num_lines); } else #endif if (writable) statusline(HUSH, P_("Read %lu line", "Read %lu lines", (unsigned long)num_lines), (unsigned long)num_lines); else statusline(ALERT, P_("Read %lu line (Warning: No write permission)", "Read %lu lines (Warning: No write permission)", (unsigned long)num_lines), (unsigned long)num_lines); if (num_lines < editwinrows) focusing = FALSE; #ifndef NANO_TINY if (ISSET(MAKE_IT_UNIX)) openfile->fmt = NIX_FILE; #endif } /* Open the file (and decide if it exists). If newfie is TRUE, display * "New File" if the file is missing. Otherwise, say "[filename] not * found". * * Return -2 if we say "New File", -1 if the file isn't opened, and the * fd opened otherwise. The file might still have an error while reading * with a 0 return value. *f is set to the opened file. */ int open_file(const char *filename, bool newfie, bool quiet, FILE **f) { struct stat fileinfo, fileinfo2; int fd; char *full_filename; assert(filename != NULL && f != NULL); /* Get the specified file's full path. */ full_filename = get_full_path(filename); /* Okay, if we can't stat the path due to a component's * permissions, just try the relative one. */ if (full_filename == NULL || (stat(full_filename, &fileinfo) == -1 && stat(filename, &fileinfo2) != -1)) full_filename = mallocstrcpy(full_filename, filename); if (stat(full_filename, &fileinfo) == -1) { /* All cases below return. */ free(full_filename); /* Well, maybe we can open the file even if the OS says it's * not there. */ if ((fd = open(filename, O_RDONLY)) != -1) { if (!quiet) statusbar(_("Reading File")); return fd; } if (newfie) { if (!quiet) statusbar(_("New File")); return -2; } statusline(ALERT, _("File \"%s\" not found"), filename); return -1; } else if (S_ISDIR(fileinfo.st_mode) || S_ISCHR(fileinfo.st_mode) || S_ISBLK(fileinfo.st_mode)) { free(full_filename); /* Don't open directories, character files, or block files. * Sorry, /dev/sndstat! */ statusline(ALERT, S_ISDIR(fileinfo.st_mode) ? _("\"%s\" is a directory") : _("\"%s\" is a device file"), filename); return -1; } else if ((fd = open(full_filename, O_RDONLY)) == -1) { free(full_filename); statusline(ALERT, _("Error reading %s: %s"), filename, strerror(errno)); return -1; } else { /* The file is A-OK. Open it. */ *f = fdopen(fd, "rb"); if (*f == NULL) { statusline(ALERT, _("Error reading %s: %s"), filename, strerror(errno)); close(fd); } else statusbar(_("Reading File")); } free(full_filename); return fd; } /* This function will return the name of the first available extension * of a filename (starting with [name][suffix], then [name][suffix].1, * etc.). Memory is allocated for the return value. If no writable * extension exists, we return "". */ char *get_next_filename(const char *name, const char *suffix) { unsigned long i = 0; char *buf; size_t wholenamelen; assert(name != NULL && suffix != NULL); wholenamelen = strlen(name) + strlen(suffix); /* Reserve space for: the name plus the suffix plus a dot plus * possibly five digits plus a null byte. */ buf = charalloc(wholenamelen + 7); sprintf(buf, "%s%s", name, suffix); while (TRUE) { struct stat fs; if (stat(buf, &fs) == -1) return buf; /* Limit the number of backup files to a hundred thousand. */ if (++i == 100000) break; sprintf(buf + wholenamelen, ".%lu", i); } /* We get here only if there is no possible save file. Blank out * the filename to indicate this. */ null_at(&buf, 0); return buf; } /* Insert a file into a new buffer if the MULTIBUFFER flag is set, or * into the current buffer if it isn't. If execute is TRUE, insert the * output of an executed command instead of a file. */ void do_insertfile( #ifndef NANO_TINY bool execute #else void #endif ) { int i; const char *msg; char *ans = mallocstrcpy(NULL, ""); /* The last answer the user typed at the statusbar prompt. */ filestruct *edittop_save = openfile->edittop; ssize_t was_current_lineno = openfile->current->lineno; size_t was_current_x = openfile->current_x; ssize_t was_current_y = openfile->current_y; bool edittop_inside = FALSE; #ifndef NANO_TINY bool right_side_up = FALSE, single_line = FALSE; #endif while (TRUE) { #ifndef NANO_TINY if (execute) { msg = #ifndef DISABLE_MULTIBUFFER ISSET(MULTIBUFFER) ? _("Command to execute in new buffer [from %s] ") : #endif _("Command to execute [from %s] "); } else #endif /* NANO_TINY */ { msg = #ifndef DISABLE_MULTIBUFFER ISSET(MULTIBUFFER) ? _("File to insert into new buffer [from %s] ") : #endif _("File to insert [from %s] "); } present_path = mallocstrcpy(present_path, "./"); i = do_prompt(TRUE, #ifndef DISABLE_TABCOMP TRUE, #endif #ifndef NANO_TINY execute ? MEXTCMD : #endif MINSERTFILE, ans, #ifndef DISABLE_HISTORIES NULL, #endif edit_refresh, msg, #ifndef DISABLE_OPERATINGDIR operating_dir != NULL && strcmp(operating_dir, ".") != 0 ? operating_dir : #endif "./"); /* If we're in multibuffer mode and the filename or command is * blank, open a new buffer instead of canceling. If the * filename or command begins with a newline (i.e. an encoded * null), treat it as though it's blank. */ if (i == -1 || ((i == -2 || *answer == '\n') #ifndef DISABLE_MULTIBUFFER && !ISSET(MULTIBUFFER) #endif )) { statusbar(_("Cancelled")); break; } else { size_t pww_save = openfile->placewewant; #if !defined(NANO_TINY) || !defined(DISABLE_BROWSER) functionptrtype func = func_from_key(&i); #endif ans = mallocstrcpy(ans, answer); #ifndef NANO_TINY #ifndef DISABLE_MULTIBUFFER if (func == new_buffer_void) { /* Don't allow toggling if we're in view mode. */ if (!ISSET(VIEW_MODE)) TOGGLE(MULTIBUFFER); else beep(); continue; } #endif if (func == flip_execute_void) { execute = !execute; continue; } #endif /* !NANO_TINY */ #ifndef DISABLE_BROWSER if (func == to_files_void) { char *tmp = do_browse_from(answer); if (tmp == NULL) continue; /* We have a file now. Indicate this. */ free(answer); answer = tmp; i = 0; } #endif /* If we don't have a file yet, go back to the statusbar prompt. */ if (i != 0 #ifndef DISABLE_MULTIBUFFER && (i != -2 || !ISSET(MULTIBUFFER)) #endif ) continue; #ifndef NANO_TINY /* Keep track of whether the mark begins inside the * partition and will need adjustment. */ if (openfile->mark_set) { filestruct *top, *bot; size_t top_x, bot_x; mark_order((const filestruct **)&top, &top_x, (const filestruct **)&bot, &bot_x, &right_side_up); single_line = (top == bot); } #endif #ifndef DISABLE_MULTIBUFFER if (!ISSET(MULTIBUFFER)) #endif { /* If we're not inserting into a new buffer, partition * the filestruct so that it contains no text and hence * looks like a new buffer, and keep track of whether * the top of the edit window is inside the partition. */ filepart = partition_filestruct(openfile->current, openfile->current_x, openfile->current, openfile->current_x); edittop_inside = (openfile->edittop == openfile->fileage); } /* Convert newlines to nulls in the given filename. */ sunder(answer); align(&answer); #ifndef NANO_TINY if (execute) { #ifndef DISABLE_MULTIBUFFER if (ISSET(MULTIBUFFER)) /* Open a blank buffer. */ open_buffer("", FALSE); #endif /* Save the command's output in the current buffer. */ execute_command(answer); #ifndef DISABLE_MULTIBUFFER if (ISSET(MULTIBUFFER)) { /* Move back to the beginning of the first line of * the buffer. */ openfile->current = openfile->fileage; openfile->current_x = 0; openfile->placewewant = 0; } #endif } else #endif /* !NANO_TINY */ { /* Make sure the path to the file specified in answer is * tilde-expanded. */ answer = mallocstrassn(answer, real_dir_from_tilde(answer)); /* Save the file specified in answer in the current buffer. */ open_buffer(answer, TRUE); } #ifndef DISABLE_MULTIBUFFER if (ISSET(MULTIBUFFER)) { #ifndef DISABLE_HISTORIES if (ISSET(POS_HISTORY)) { ssize_t priorline, priorcol; #ifndef NANO_TINY if (!execute) #endif if (check_poshistory(answer, &priorline, &priorcol)) do_gotolinecolumn(priorline, priorcol, FALSE, FALSE); } #endif /* !DISABLE_HISTORIES */ /* Update the screen to account for the current buffer. */ display_buffer(); } else #endif /* !DISABLE_MULTIBUFFER */ { filestruct *top_save = openfile->fileage; /* If we were at the top of the edit window before, set * the saved value of edittop to the new top of the edit * window. */ if (edittop_inside) edittop_save = openfile->fileage; /* Update the current x-coordinate to account for the * number of characters inserted on the current line. * If the mark was positioned after the cursor and on the * same line, adjust the mark's coordinates to compensate * for the change in this line. */ openfile->current_x = strlen(openfile->filebot->data); if (openfile->fileage == openfile->filebot) { #ifndef NANO_TINY if (openfile->mark_set) { openfile->mark_begin = openfile->current; if (!right_side_up) openfile->mark_begin_x += openfile->current_x; } #endif openfile->current_x += was_current_x; } #ifndef NANO_TINY else if (openfile->mark_set) { if (!right_side_up) { if (single_line) { openfile->mark_begin = openfile->current; openfile->mark_begin_x -= was_current_x; } else openfile->mark_begin_x -= openfile->current_x; } } #endif /* Update the current y-coordinate to account for the * number of lines inserted. */ openfile->current_y += was_current_y; /* Unpartition the filestruct so that it contains all * the text again. Note that we've replaced the * non-text originally in the partition with the text in * the inserted file/executed command output. */ unpartition_filestruct(&filepart); /* Renumber starting with the beginning line of the old * partition. */ renumber(top_save); /* Restore the old edittop. */ openfile->edittop = edittop_save; /* Restore the old place we want. */ openfile->placewewant = pww_save; /* Mark the file as modified if it changed. */ if (openfile->current->lineno != was_current_lineno || openfile->current_x != was_current_x) set_modified(); /* Update the screen. */ edit_refresh(); } break; } } free(ans); } /* Insert a file into a new buffer or the current buffer, depending on * whether the MULTIBUFFER flag is set. If we're in view mode, only * allow inserting a file into a new buffer. */ void do_insertfile_void(void) { if (ISSET(RESTRICTED)) { show_restricted_warning(); return; } #ifndef DISABLE_MULTIBUFFER if (ISSET(VIEW_MODE) && !ISSET(MULTIBUFFER)) statusbar(_("Key invalid in non-multibuffer mode")); else #endif do_insertfile( #ifndef NANO_TINY FALSE #endif ); display_main_list(); } /* When passed "[relative path]" or "[relative path][filename]" in * origpath, return "[full path]" or "[full path][filename]" on success, * or NULL on error. Do this if the file doesn't exist but the relative * path does, since the file could exist in memory but not yet on disk). * Don't do this if the relative path doesn't exist, since we won't be * able to go there. */ char *get_full_path(const char *origpath) { int attempts = 0; /* How often we've tried climbing back up the tree. */ struct stat fileinfo; char *currentdir, *d_here, *d_there, *d_there_file = NULL; const char *last_slash; bool path_only; if (origpath == NULL) return NULL; /* Get the current directory. If it doesn't exist, back up and try * again until we get a directory that does, and use that as the * current directory. */ currentdir = charalloc(PATH_MAX + 1); d_here = getcwd(currentdir, PATH_MAX + 1); while (d_here == NULL && attempts < 20) { IGNORE_CALL_RESULT(chdir("..")); d_here = getcwd(NULL, PATH_MAX + 1); attempts++; } /* If we succeeded, canonicalize it in d_here. */ if (d_here != NULL) { align(&d_here); /* If the current directory isn't "/", tack a slash onto the end * of it. */ if (strcmp(d_here, "/") != 0) { d_here = charealloc(d_here, strlen(d_here) + 2); strcat(d_here, "/"); } /* Otherwise, set d_here to "". */ } else { d_here = mallocstrcpy(NULL, ""); free(currentdir); } d_there = real_dir_from_tilde(origpath); /* If stat()ing d_there fails, assume that d_there refers to a new * file that hasn't been saved to disk yet. Set path_only to TRUE * if d_there refers to a directory, and FALSE otherwise. */ path_only = (stat(d_there, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode)); /* If path_only is TRUE, make sure d_there ends in a slash. */ if (path_only) { size_t d_there_len = strlen(d_there); if (d_there[d_there_len - 1] != '/') { d_there = charealloc(d_there, d_there_len + 2); strcat(d_there, "/"); } } /* Search for the last slash in d_there. */ last_slash = strrchr(d_there, '/'); /* If we didn't find one, then make sure the answer is in the format * "d_here/d_there". */ if (last_slash == NULL) { assert(!path_only); d_there_file = d_there; d_there = d_here; } else { /* If path_only is FALSE, then save the filename portion of the * answer (everything after the last slash) in d_there_file. */ if (!path_only) d_there_file = mallocstrcpy(NULL, last_slash + 1); /* Remove the filename portion of the answer from d_there. */ null_at(&d_there, last_slash - d_there + 1); /* Go to the path specified in d_there. */ if (chdir(d_there) == -1) { free(d_there); d_there = NULL; } else { free(d_there); /* Get the full path. */ currentdir = charalloc(PATH_MAX + 1); d_there = getcwd(currentdir, PATH_MAX + 1); /* If we succeeded, canonicalize it in d_there. */ if (d_there != NULL) { align(&d_there); /* If the current directory isn't "/", tack a slash onto * the end of it. */ if (strcmp(d_there, "/") != 0) { d_there = charealloc(d_there, strlen(d_there) + 2); strcat(d_there, "/"); } /* Otherwise, make sure that we return NULL. */ } else { path_only = TRUE; free(currentdir); } /* Finally, go back to the path specified in d_here, * where we were before. We don't check for a chdir() * error, since we can do nothing if we get one. */ IGNORE_CALL_RESULT(chdir(d_here)); } /* Free d_here, since we're done using it. */ free(d_here); } /* At this point, if path_only is FALSE and d_there isn't NULL, * d_there contains the path portion of the answer and d_there_file * contains the filename portion of the answer. If this is the * case, tack the latter onto the end of the former. d_there will * then contain the complete answer. */ if (!path_only && d_there != NULL) { d_there = charealloc(d_there, strlen(d_there) + strlen(d_there_file) + 1); strcat(d_there, d_there_file); } /* Free d_there_file, since we're done using it. */ free(d_there_file); return d_there; } /* Return the full version of path, as returned by get_full_path(). On * error, or if path doesn't reference a directory, or if the directory * isn't writable, return NULL. */ char *check_writable_directory(const char *path) { char *full_path = get_full_path(path); if (full_path == NULL) return NULL; /* If we can't write to path or path isn't a directory, return NULL. */ if (access(full_path, W_OK) != 0 || full_path[strlen(full_path) - 1] != '/') { free(full_path); return NULL; } return full_path; } /* This function calls mkstemp(($TMPDIR|P_tmpdir|/tmp/)"nano.XXXXXX"). * On success, it returns the malloc()ed filename and corresponding FILE * stream, opened in "r+b" mode. On error, it returns NULL for the * filename and leaves the FILE stream unchanged. */ char *safe_tempfile(FILE **f) { char *full_tempdir = NULL; const char *tmpdir_env; int fd; mode_t original_umask = 0; assert(f != NULL); /* If $TMPDIR is set, set tempdir to it, run it through * get_full_path(), and save the result in full_tempdir. Otherwise, * leave full_tempdir set to NULL. */ tmpdir_env = getenv("TMPDIR"); if (tmpdir_env != NULL) full_tempdir = check_writable_directory(tmpdir_env); /* If $TMPDIR is unset, empty, or not a writable directory, and * full_tempdir is NULL, try P_tmpdir instead. */ if (full_tempdir == NULL) full_tempdir = check_writable_directory(P_tmpdir); /* if P_tmpdir is NULL, use /tmp. */ if (full_tempdir == NULL) full_tempdir = mallocstrcpy(NULL, "/tmp/"); full_tempdir = charealloc(full_tempdir, strlen(full_tempdir) + 12); strcat(full_tempdir, "nano.XXXXXX"); original_umask = umask(0); umask(S_IRWXG | S_IRWXO); fd = mkstemp(full_tempdir); if (fd != -1) *f = fdopen(fd, "r+b"); else { free(full_tempdir); full_tempdir = NULL; } umask(original_umask); return full_tempdir; } #ifndef DISABLE_OPERATINGDIR /* Initialize full_operating_dir based on operating_dir. */ void init_operating_dir(void) { assert(full_operating_dir == NULL); if (operating_dir == NULL) return; full_operating_dir = get_full_path(operating_dir); /* If get_full_path() failed or the operating directory is * inaccessible, unset operating_dir. */ if (full_operating_dir == NULL || chdir(full_operating_dir) == -1) { free(full_operating_dir); full_operating_dir = NULL; free(operating_dir); operating_dir = NULL; } } /* Check to see if we're inside the operating directory. Return FALSE * if we are, or TRUE otherwise. If allow_tabcomp is TRUE, allow * incomplete names that would be matches for the operating directory, * so that tab completion will work. */ bool check_operating_dir(const char *currpath, bool allow_tabcomp) { /* full_operating_dir is global for memory cleanup. It should have * already been initialized by init_operating_dir(). Also, a * relative operating directory path will only be handled properly * if this is done. */ char *fullpath; bool retval = FALSE; const char *whereami1, *whereami2 = NULL; /* If no operating directory is set, don't bother doing anything. */ if (operating_dir == NULL) return FALSE; assert(full_operating_dir != NULL); fullpath = get_full_path(currpath); /* If fullpath is NULL, it means some directory in the path doesn't * exist or is unreadable. If allow_tabcomp is FALSE, then currpath * is what the user typed somewhere. We don't want to report a * non-existent directory as being outside the operating directory, * so we return FALSE. If allow_tabcomp is TRUE, then currpath * exists, but is not executable. So we say it isn't in the * operating directory. */ if (fullpath == NULL) return allow_tabcomp; whereami1 = strstr(fullpath, full_operating_dir); if (allow_tabcomp) whereami2 = strstr(full_operating_dir, fullpath); /* If both searches failed, we're outside the operating directory. * Otherwise, check the search results. If the full operating * directory path is not at the beginning of the full current path * (for normal usage) and vice versa (for tab completion, if we're * allowing it), we're outside the operating directory. */ if (whereami1 != fullpath && whereami2 != full_operating_dir) retval = TRUE; free(fullpath); /* Otherwise, we're still inside it. */ return retval; } #endif #ifndef NANO_TINY /* Although this sucks, it sucks less than having a single 'my system is * messed up and I'm blanket allowing insecure file writing operations'. */ int prompt_failed_backupwrite(const char *filename) { static int i; static char *prevfile = NULL; /* What was the last file we were * passed so we don't keep asking * this? Though maybe we should... */ if (prevfile == NULL || strcmp(filename, prevfile)) { i = do_yesno_prompt(FALSE, _("Failed to write backup file, continue saving? (Say N if unsure) ")); prevfile = mallocstrcpy(prevfile, filename); } return i; } void init_backup_dir(void) { char *full_backup_dir; if (backup_dir == NULL) return; full_backup_dir = get_full_path(backup_dir); /* If get_full_path() failed or the backup directory is * inaccessible, unset backup_dir. */ if (full_backup_dir == NULL || full_backup_dir[strlen(full_backup_dir) - 1] != '/') { free(full_backup_dir); free(backup_dir); backup_dir = NULL; } else { free(backup_dir); backup_dir = full_backup_dir; } } #endif /* !NANO_TINY */ /* Read from inn, write to out. We assume inn is opened for reading, * and out for writing. We return 0 on success, -1 on read error, or -2 * on write error. */ int copy_file(FILE *inn, FILE *out) { int retval = 0; char buf[BUFSIZ]; size_t charsread; assert(inn != NULL && out != NULL && inn != out); do { charsread = fread(buf, sizeof(char), BUFSIZ, inn); if (charsread == 0 && ferror(inn)) { retval = -1; break; } if (fwrite(buf, sizeof(char), charsread, out) < charsread) { retval = -2; break; } } while (charsread > 0); if (fclose(inn) == EOF) retval = -1; if (fclose(out) == EOF) retval = -2; return retval; } /* Write a file out to disk. If f_open isn't NULL, we assume that it is * a stream associated with the file, and we don't try to open it * ourselves. If tmp is TRUE, we set the umask to disallow anyone else * from accessing the file, we don't set the filename to its name, and * we don't print out how many lines we wrote on the statusbar. * * tmp means we are writing a temporary file in a secure fashion. We * use it when spell checking or dumping the file on an error. If * append is APPEND, it means we are appending instead of overwriting. * If append is PREPEND, it means we are prepending instead of * overwriting. If nonamechange is TRUE, we don't change the current * filename. nonamechange is ignored if tmp is FALSE, we're appending, * or we're prepending. * * Return TRUE on success or FALSE on error. */ bool write_file(const char *name, FILE *f_open, bool tmp, append_type append, bool nonamechange) { bool retval = FALSE; /* Instead of returning in this function, you should always * set retval and then goto cleanup_and_exit. */ size_t lineswritten = 0; const filestruct *fileptr = openfile->fileage; int fd; /* The file descriptor we use. */ mode_t original_umask = 0; /* Our umask, from when nano started. */ #ifndef NANO_TINY bool realexists; /* The result of stat(). TRUE if the file exists, FALSE * otherwise. If name is a link that points nowhere, realexists * is FALSE. */ #endif struct stat st; /* The status fields filled in by stat(). */ char *realname; /* The filename after tilde expansion. */ FILE *f = f_open; /* The actual file, realname, we are writing to. */ char *tempname = NULL; /* The name of the temporary file we write to on prepend. */ assert(name != NULL); if (*name == '\0') return -1; if (!tmp) titlebar(NULL); realname = real_dir_from_tilde(name); #ifndef DISABLE_OPERATINGDIR /* If we're writing a temporary file, we're probably going outside * the operating directory, so skip the operating directory test. */ if (!tmp && check_operating_dir(realname, FALSE)) { statusline(ALERT, _("Can't write outside of %s"), operating_dir); goto cleanup_and_exit; } #endif /* If the temp file exists and isn't already open, give up. */ if (tmp && (lstat(realname, &st) != -1) && f_open == NULL) goto cleanup_and_exit; #ifndef NANO_TINY /* Check whether the file (at the end of the symlink) exists. */ realexists = (stat(realname, &st) != -1); /* If we haven't stat()d this file before (say, the user just * specified it interactively), stat and save the value now, * or else we will chase null pointers when we do modtime checks, * preserve file times, and so on, during backup. */ if (openfile->current_stat == NULL && !tmp && realexists) stat_with_alloc(realname, &openfile->current_stat); /* We backup only if the backup toggle is set, the file isn't * temporary, and the file already exists. Furthermore, if we * aren't appending, prepending, or writing a selection, we backup * only if the file has not been modified by someone else since nano * opened it. */ if (ISSET(BACKUP_FILE) && !tmp && realexists && ((append != OVERWRITE || openfile->mark_set) || (openfile->current_stat && openfile->current_stat->st_mtime == st.st_mtime))) { int backup_fd; FILE *backup_file; char *backupname; struct utimbuf filetime; int copy_status; int backup_cflags; /* Save the original file's access and modification times. */ filetime.actime = openfile->current_stat->st_atime; filetime.modtime = openfile->current_stat->st_mtime; if (f_open == NULL) { /* Open the original file to copy to the backup. */ f = fopen(realname, "rb"); if (f == NULL) { statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno)); /* If we can't read from the original file, go on, since * only saving the original file is better than saving * nothing. */ goto skip_backup; } } /* If backup_dir is set, we set backupname to * backup_dir/backupname~[.number], where backupname is the * canonicalized absolute pathname of realname with every '/' * replaced with a '!'. This means that /home/foo/file is * backed up in backup_dir/!home!foo!file~[.number]. */ if (backup_dir != NULL) { char *backuptemp = get_full_path(realname); if (backuptemp == NULL) /* If get_full_path() failed, we don't have a * canonicalized absolute pathname, so just use the * filename portion of the pathname. We use tail() so * that e.g. ../backupname will be backed up in * backupdir/backupname~ instead of * backupdir/../backupname~. */ backuptemp = mallocstrcpy(NULL, tail(realname)); else { size_t i = 0; for (; backuptemp[i] != '\0'; i++) { if (backuptemp[i] == '/') backuptemp[i] = '!'; } } backupname = charalloc(strlen(backup_dir) + strlen(backuptemp) + 1); sprintf(backupname, "%s%s", backup_dir, backuptemp); free(backuptemp); backuptemp = get_next_filename(backupname, "~"); if (*backuptemp == '\0') { statusline(HUSH, _("Error writing backup file %s: %s"), backupname, _("Too many backup files?")); free(backuptemp); free(backupname); /* If we can't write to the backup, DON'T go on, since * whatever caused the backup file to fail (e.g. disk * full may well cause the real file write to fail, * which means we could lose both the backup and the * original! */ goto cleanup_and_exit; } else { free(backupname); backupname = backuptemp; } } else { backupname = charalloc(strlen(realname) + 2); sprintf(backupname, "%s~", realname); } /* First, unlink any existing backups. Next, open the backup * file with O_CREAT and O_EXCL. If it succeeds, we have a file * descriptor to a new backup file. */ if (unlink(backupname) < 0 && errno != ENOENT && !ISSET(INSECURE_BACKUP)) { if (prompt_failed_backupwrite(backupname)) goto skip_backup; statusline(HUSH, _("Error writing backup file %s: %s"), backupname, strerror(errno)); free(backupname); goto cleanup_and_exit; } if (ISSET(INSECURE_BACKUP)) backup_cflags = O_WRONLY | O_CREAT | O_APPEND; else backup_cflags = O_WRONLY | O_CREAT | O_EXCL | O_APPEND; backup_fd = open(backupname, backup_cflags, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); /* Now we've got a safe file stream. If the previous open() * call failed, this will return NULL. */ backup_file = fdopen(backup_fd, "wb"); if (backup_fd < 0 || backup_file == NULL) { statusline(HUSH, _("Error writing backup file %s: %s"), backupname, strerror(errno)); free(backupname); goto cleanup_and_exit; } /* We shouldn't worry about chown()ing something if we're not * root, since it's likely to fail! */ if (geteuid() == NANO_ROOT_UID && fchown(backup_fd, openfile->current_stat->st_uid, openfile->current_stat->st_gid) == -1 && !ISSET(INSECURE_BACKUP)) { if (prompt_failed_backupwrite(backupname)) goto skip_backup; statusline(HUSH, _("Error writing backup file %s: %s"), backupname, strerror(errno)); free(backupname); fclose(backup_file); goto cleanup_and_exit; } if (fchmod(backup_fd, openfile->current_stat->st_mode) == -1 && !ISSET(INSECURE_BACKUP)) { if (prompt_failed_backupwrite(backupname)) goto skip_backup; statusline(HUSH, _("Error writing backup file %s: %s"), backupname, strerror(errno)); free(backupname); fclose(backup_file); /* If we can't write to the backup, DONT go on, since * whatever caused the backup file to fail (e.g. disk * full) may well cause the real file write to fail, which * means we could lose both the backup and the original! */ goto cleanup_and_exit; } #ifdef DEBUG fprintf(stderr, "Backing up %s to %s\n", realname, backupname); #endif /* Copy the file. */ copy_status = copy_file(f, backup_file); if (copy_status != 0) { statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno)); goto cleanup_and_exit; } /* And set its metadata. */ if (utime(backupname, &filetime) == -1 && !ISSET(INSECURE_BACKUP)) { if (prompt_failed_backupwrite(backupname)) goto skip_backup; statusline(HUSH, _("Error writing backup file %s: %s"), backupname, strerror(errno)); /* If we can't write to the backup, DON'T go on, since * whatever caused the backup file to fail (e.g. disk full * may well cause the real file write to fail, which means * we could lose both the backup and the original! */ goto cleanup_and_exit; } free(backupname); } skip_backup: #endif /* !NANO_TINY */ if (f_open == NULL) { original_umask = umask(0); /* If we create a temp file, we don't let anyone else access it. * We create a temp file if tmp is TRUE. */ if (tmp) umask(S_IRWXG | S_IRWXO); else umask(original_umask); } /* If we're prepending, copy the file to a temp file. */ if (append == PREPEND) { int fd_source; FILE *f_source = NULL; if (f == NULL) { f = fopen(realname, "rb"); if (f == NULL) { statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno)); goto cleanup_and_exit; } } tempname = safe_tempfile(&f); if (tempname == NULL) { statusline(HUSH, _("Error writing temp file: %s"), strerror(errno)); goto cleanup_and_exit; } if (f_open == NULL) { fd_source = open(realname, O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR); if (fd_source != -1) { f_source = fdopen(fd_source, "rb"); if (f_source == NULL) { statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno)); close(fd_source); fclose(f); unlink(tempname); goto cleanup_and_exit; } } } if (f_source == NULL || copy_file(f_source, f) != 0) { statusline(HUSH, _("Error writing %s: %s"), tempname, strerror(errno)); unlink(tempname); goto cleanup_and_exit; } } if (f_open == NULL) { /* Now open the file in place. Use O_EXCL if tmp is TRUE. This * is copied from joe, because wiggy says so *shrug*. */ fd = open(realname, O_WRONLY | O_CREAT | ((append == APPEND) ? O_APPEND : (tmp ? O_EXCL : O_TRUNC)), S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); /* Set the umask back to the user's original value. */ umask(original_umask); /* If we couldn't open the file, give up. */ if (fd == -1) { statusline(HUSH, _("Error writing %s: %s"), realname, strerror(errno)); if (tempname != NULL) unlink(tempname); goto cleanup_and_exit; } f = fdopen(fd, (append == APPEND) ? "ab" : "wb"); if (f == NULL) { statusline(HUSH, _("Error writing %s: %s"), realname, strerror(errno)); close(fd); goto cleanup_and_exit; } } /* There might not be a magicline. There won't be when writing out * a selection. */ assert(openfile->fileage != NULL && openfile->filebot != NULL); while (fileptr != NULL) { size_t data_len = strlen(fileptr->data), size; /* Convert newlines to nulls, just before we write to disk. */ sunder(fileptr->data); size = fwrite(fileptr->data, sizeof(char), data_len, f); /* Convert nulls to newlines. data_len is the string's real * length. */ unsunder(fileptr->data, data_len); if (size < data_len) { statusline(HUSH, _("Error writing %s: %s"), realname, strerror(errno)); fclose(f); goto cleanup_and_exit; } /* If we're on the last line of the file, don't write a newline * character after it. If the last line of the file is blank, * this means that zero bytes are written, in which case we * don't count the last line in the total lines written. */ if (fileptr == openfile->filebot) { if (fileptr->data[0] == '\0') lineswritten--; } else { #ifndef NANO_TINY if (openfile->fmt == DOS_FILE || openfile->fmt == MAC_FILE) { if (putc('\r', f) == EOF) { statusline(HUSH, _("Error writing %s: %s"), realname, strerror(errno)); fclose(f); goto cleanup_and_exit; } } if (openfile->fmt != MAC_FILE) #endif if (putc('\n', f) == EOF) { statusline(HUSH, _("Error writing %s: %s"), realname, strerror(errno)); fclose(f); goto cleanup_and_exit; } } fileptr = fileptr->next; lineswritten++; } /* If we're prepending, open the temp file, and append it to f. */ if (append == PREPEND) { int fd_source; FILE *f_source = NULL; fd_source = open(tempname, O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR); if (fd_source != -1) { f_source = fdopen(fd_source, "rb"); if (f_source == NULL) close(fd_source); } if (f_source == NULL) { statusline(ALERT, _("Error reading %s: %s"), tempname, strerror(errno)); fclose(f); goto cleanup_and_exit; } if (copy_file(f_source, f) == -1) { statusline(HUSH, _("Error writing %s: %s"), realname, strerror(errno)); goto cleanup_and_exit; } unlink(tempname); } else if (fclose(f) != 0) { statusline(HUSH, _("Error writing %s: %s"), realname, strerror(errno)); goto cleanup_and_exit; } if (!tmp && append == OVERWRITE) { if (!nonamechange) { openfile->filename = mallocstrcpy(openfile->filename, realname); #ifndef DISABLE_COLOR /* We might have changed the filename, so update the colors * to account for it, and then make sure we're using them. */ color_update(); color_init(); /* If color syntaxes are available and turned on, we need to * call edit_refresh(). */ if (openfile->colorstrings != NULL && !ISSET(NO_COLOR_SYNTAX)) edit_refresh(); #endif } #ifndef NANO_TINY if (!openfile->mark_set) /* Get or update the stat info to reflect the current state. */ stat_with_alloc(realname, &openfile->current_stat); #endif statusline(HUSH, P_("Wrote %lu line", "Wrote %lu lines", (unsigned long)lineswritten), (unsigned long)lineswritten); openfile->modified = FALSE; titlebar(NULL); } retval = TRUE; cleanup_and_exit: free(realname); free(tempname); return retval; } #ifndef NANO_TINY /* Write a marked selection from a file out to disk. Return TRUE on * success or FALSE on error. */ bool write_marked_file(const char *name, FILE *f_open, bool tmp, append_type append) { bool retval; bool old_modified = openfile->modified; /* Save the status, because write_file() unsets the modified flag. */ bool added_magicline = FALSE; /* Whether we added a magicline after filebot. */ filestruct *top, *bot; size_t top_x, bot_x; assert(openfile->mark_set); /* Partition the filestruct so that it contains only the marked text. */ mark_order((const filestruct **)&top, &top_x, (const filestruct **)&bot, &bot_x, NULL); filepart = partition_filestruct(top, top_x, bot, bot_x); /* If we are doing magicline, and the last line of the partition * isn't blank, then add a newline at the end of the buffer. */ if (!ISSET(NO_NEWLINES) && openfile->filebot->data[0] != '\0') { new_magicline(); added_magicline = TRUE; } retval = write_file(name, f_open, tmp, append, TRUE); /* If we added a magicline, remove it now. */ if (added_magicline) remove_magicline(); /* Unpartition the filestruct so that it contains all the text again. */ unpartition_filestruct(&filepart); if (old_modified) set_modified(); return retval; } #endif /* !NANO_TINY */ /* Write the current file to disk. If the mark is on, write the current * marked selection to disk. If exiting is TRUE, write the entire file * to disk regardless of whether the mark is on, and without prompting if * the TEMP_FILE flag is set and the current file has a name. Return 0 * on error, 1 on success, and 2 when the buffer is to be discarded. */ int do_writeout(bool exiting) { int i; append_type append = OVERWRITE; char *ans; /* The last answer the user typed at the statusbar prompt. */ #ifndef DISABLE_EXTRA static bool did_credits = FALSE; #endif bool maychange = FALSE; /* Whether it's okay to save the file under a different name. */ bool result = FALSE; if (exiting && openfile->filename[0] != '\0' && ISSET(TEMP_FILE)) { result = write_file(openfile->filename, NULL, FALSE, OVERWRITE, FALSE); if (result) return 1; /* The write succeeded. */ } ans = mallocstrcpy(NULL, #ifndef NANO_TINY (!exiting && openfile->mark_set) ? "" : #endif openfile->filename); while (TRUE) { const char *msg; #ifndef NANO_TINY const char *formatstr, *backupstr; formatstr = (openfile->fmt == DOS_FILE) ? _(" [DOS Format]") : (openfile->fmt == MAC_FILE) ? _(" [Mac Format]") : ""; backupstr = ISSET(BACKUP_FILE) ? _(" [Backup]") : ""; /* If we're using restricted mode, don't display the "Write * Selection to File" prompt. This function is disabled, since * it allows reading from or writing to files not specified on * the command line. */ if (!ISSET(RESTRICTED) && !exiting && openfile->mark_set) msg = (append == PREPEND) ? _("Prepend Selection to File") : (append == APPEND) ? _("Append Selection to File") : _("Write Selection to File"); else #endif /* !NANO_TINY */ msg = (append == PREPEND) ? _("File Name to Prepend to") : (append == APPEND) ? _("File Name to Append to") : _("File Name to Write"); present_path = mallocstrcpy(present_path, "./"); /* If we're using restricted mode, and the filename isn't blank, * disable tab completion. */ i = do_prompt(!ISSET(RESTRICTED) || openfile->filename[0] == '\0', #ifndef DISABLE_TABCOMP TRUE, #endif MWRITEFILE, ans, #ifndef DISABLE_HISTORIES NULL, #endif edit_refresh, "%s%s%s", msg, #ifndef NANO_TINY formatstr, backupstr #else "", "" #endif ); /* If the filename or command begins with a newline (i.e. an * encoded null), treat it as though it's blank. */ if (i < 0 || *answer == '\n') { statusbar(_("Cancelled")); break; } else { functionptrtype func = func_from_key(&i); /* Upon request, abandon the buffer, if user is sure. */ if (func == discard_buffer) { if (openfile->modified) i = do_yesno_prompt(FALSE, _("Save modified buffer anyway? ")); else i = 0; if (i == 0) { free(ans); return 2; /* Yes, discard the buffer. */ } else continue; /* Go back to the filename prompt. */ } ans = mallocstrcpy(ans, answer); #ifndef DISABLE_BROWSER if (func == to_files_void) { char *tmp = do_browse_from(answer); if (tmp == NULL) continue; /* We have a file now. Indicate this. */ free(answer); answer = tmp; } else #endif /* !DISABLE_BROWSER */ #ifndef NANO_TINY if (func == dos_format_void) { openfile->fmt = (openfile->fmt == DOS_FILE) ? NIX_FILE : DOS_FILE; continue; } else if (func == mac_format_void) { openfile->fmt = (openfile->fmt == MAC_FILE) ? NIX_FILE : MAC_FILE; continue; } else if (func == backup_file_void) { TOGGLE(BACKUP_FILE); continue; } else #endif /* !NANO_TINY */ if (func == prepend_void) { append = (append == PREPEND) ? OVERWRITE : PREPEND; continue; } else if (func == append_void) { append = (append == APPEND) ? OVERWRITE : APPEND; continue; } else if (func == do_help_void) { continue; } #ifdef DEBUG fprintf(stderr, "filename is %s\n", answer); #endif #ifndef DISABLE_EXTRA /* If the current file has been modified, we've pressed * Ctrl-X at the edit window to exit, we've pressed "y" at * the "Save modified buffer" prompt to save, we've entered * "zzy" as the filename to save under (hence "xyzzy"), and * this is the first time we've done this, show an Easter * egg. Display the credits. */ if (!did_credits && exiting && !ISSET(TEMP_FILE) && strcasecmp(answer, "zzy") == 0) { do_credits(); did_credits = TRUE; break; } #endif if (append == OVERWRITE) { size_t answer_len = strlen(answer); bool name_exists, do_warning; char *full_answer, *full_filename; struct stat st; /* Convert newlines to nulls, just before we get the * full path. */ sunder(answer); full_answer = get_full_path(answer); full_filename = get_full_path(openfile->filename); name_exists = (stat((full_answer == NULL) ? answer : full_answer, &st) != -1); if (openfile->filename[0] == '\0') do_warning = name_exists; else do_warning = (strcmp((full_answer == NULL) ? answer : full_answer, (full_filename == NULL) ? openfile->filename : full_filename) != 0); /* Convert nulls to newlines. answer_len is the * string's real length. */ unsunder(answer, answer_len); free(full_filename); free(full_answer); if (do_warning) { /* If we're using restricted mode, we aren't allowed * to overwrite an existing file with the current * file. We also aren't allowed to change the name * of the current file if it has one, because that * would allow reading from or writing to files not * specified on the command line. */ if (ISSET(RESTRICTED)) continue; if (!maychange) { #ifndef NANO_TINY if (exiting || !openfile->mark_set) #endif { i = do_yesno_prompt(FALSE, _("Save file under DIFFERENT NAME? ")); if (i < 1) continue; maychange = TRUE; } } if (name_exists) { char *question = _("File \"%s\" exists; OVERWRITE? "); char *message = charalloc(strlen(question) + strlen(answer) + 1); sprintf(message, question, answer); i = do_yesno_prompt(FALSE, message); free(message); if (i < 1) continue; } } #ifndef NANO_TINY /* Complain if the file exists, the name hasn't changed, * and the stat information we had before does not match * what we have now. */ else if (name_exists && openfile->current_stat && (openfile->current_stat->st_mtime < st.st_mtime || openfile->current_stat->st_dev != st.st_dev || openfile->current_stat->st_ino != st.st_ino)) { i = do_yesno_prompt(FALSE, _("File was modified since you opened it;" " continue saving? ")); if (i == 0 || i == -1) continue; } #endif } /* Convert newlines to nulls, just before we save the file. */ sunder(answer); align(&answer); /* Here's where we allow the selected text to be written to * a separate file. If we're using restricted mode, this * function is disabled, since it allows reading from or * writing to files not specified on the command line. */ #ifndef NANO_TINY if (!ISSET(RESTRICTED) && !exiting && openfile->mark_set) result = write_marked_file(answer, NULL, FALSE, append); else #endif result = write_file(answer, NULL, FALSE, append, FALSE); break; } } free(ans); return result ? 1 : 0; } /* Write the current buffer to disk, or discard it. */ void do_writeout_void(void) { /* If the user chose to discard the buffer, close it. */ if (do_writeout(FALSE) == 2) close_and_go(); display_main_list(); } #ifndef NANO_TINY /* If it has a name, write the current file to disk without prompting. */ void do_savefile(void) { if (openfile->filename[0] != '\0') write_file(openfile->filename, NULL, FALSE, OVERWRITE, FALSE); else do_writeout_void(); } #endif /* Return a malloc()ed string containing the actual directory, used to * convert ~user/ and ~/ notation. */ char *real_dir_from_tilde(const char *buf) { char *retval; assert(buf != NULL); if (*buf == '~') { size_t i = 1; char *tilde_dir; /* Figure out how much of the string we need to compare. */ for (; buf[i] != '/' && buf[i] != '\0'; i++) ; /* Get the home directory. */ if (i == 1) { get_homedir(); tilde_dir = mallocstrcpy(NULL, homedir); } else { const struct passwd *userdata; tilde_dir = mallocstrncpy(NULL, buf, i + 1); tilde_dir[i] = '\0'; do { userdata = getpwent(); } while (userdata != NULL && strcmp(userdata->pw_name, tilde_dir + 1) != 0); endpwent(); if (userdata != NULL) tilde_dir = mallocstrcpy(tilde_dir, userdata->pw_dir); } retval = charalloc(strlen(tilde_dir) + strlen(buf + i) + 1); sprintf(retval, "%s%s", tilde_dir, buf + i); free(tilde_dir); } else retval = mallocstrcpy(NULL, buf); return retval; } #if !defined(DISABLE_TABCOMP) || !defined(DISABLE_BROWSER) /* Our sort routine for file listings. Sort alphabetically and * case-insensitively, and sort directories before filenames. */ int diralphasort(const void *va, const void *vb) { struct stat fileinfo; const char *a = *(const char *const *)va; const char *b = *(const char *const *)vb; bool aisdir = stat(a, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode); bool bisdir = stat(b, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode); if (aisdir && !bisdir) return -1; if (!aisdir && bisdir) return 1; /* Standard function brain damage: We should be sorting * alphabetically and case-insensitively according to the current * locale, but there's no standard strcasecoll() function, so we * have to use multibyte strcasecmp() instead. */ return mbstrcasecmp(a, b); } /* Free the memory allocated for array, which should contain len * elements. */ void free_chararray(char **array, size_t len) { if (array == NULL) return; for (; len > 0; len--) free(array[len - 1]); free(array); } #endif #ifndef DISABLE_TABCOMP /* Is the given path a directory? */ bool is_dir(const char *buf) { char *dirptr; struct stat fileinfo; bool retval; assert(buf != NULL); dirptr = real_dir_from_tilde(buf); retval = (stat(dirptr, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode)); free(dirptr); return retval; } /* These functions, username_tab_completion(), cwd_tab_completion() * (originally exe_n_cwd_tab_completion()), and input_tab(), were * adapted from busybox 0.46 (cmdedit.c). Here is the notice from that * file, with the copyright years updated: * * Termios command line History and Editting, originally * intended for NetBSD sh (ash) * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 * Main code: Adam Rogoyski * Etc: Dave Cinege * Majorly adjusted/re-written for busybox: * Erik Andersen * * You may use this code as you wish, so long as the original author(s) * are attributed in any redistributions of the source code. * This code is 'as is' with no warranty. * This code may safely be consumed by a BSD or GPL license. */ /* We consider the first buf_len characters of buf for ~username tab * completion. */ char **username_tab_completion(const char *buf, size_t *num_matches, size_t buf_len) { char **matches = NULL; const struct passwd *userdata; assert(buf != NULL && num_matches != NULL && buf_len > 0); *num_matches = 0; while ((userdata = getpwent()) != NULL) { if (strncmp(userdata->pw_name, buf + 1, buf_len - 1) == 0) { /* Cool, found a match. Add it to the list. This makes a * lot more sense to me (Chris) this way... */ #ifndef DISABLE_OPERATINGDIR /* ...unless the match exists outside the operating * directory, in which case just go to the next match. */ if (check_operating_dir(userdata->pw_dir, TRUE)) continue; #endif matches = (char **)nrealloc(matches, (*num_matches + 1) * sizeof(char *)); matches[*num_matches] = charalloc(strlen(userdata->pw_name) + 2); sprintf(matches[*num_matches], "~%s", userdata->pw_name); ++(*num_matches); } } endpwent(); return matches; } /* We consider the first buf_len characters of buf for filename tab * completion. */ char **cwd_tab_completion(const char *buf, bool allow_files, size_t *num_matches, size_t buf_len) { char *dirname = mallocstrcpy(NULL, buf); char *slash, *filename; size_t filenamelen; char **matches = NULL; DIR *dir; const struct dirent *nextdir; *num_matches = 0; null_at(&dirname, buf_len); /* If there's a / in the name, split out filename and directory parts. */ slash = strrchr(dirname, '/'); if (slash != NULL) { char *wasdirname = dirname; filename = mallocstrcpy(NULL, ++slash); /* Cut off the filename part after the slash. */ *slash = '\0'; dirname = real_dir_from_tilde(dirname); /* A non-absolute path is relative to the current browser directory. */ if (dirname[0] != '/') { dirname = charealloc(dirname, strlen(present_path) + strlen(wasdirname) + 1); sprintf(dirname, "%s%s", present_path, wasdirname); } free(wasdirname); } else { filename = dirname; dirname = mallocstrcpy(NULL, present_path); } assert(dirname[strlen(dirname) - 1] == '/'); dir = opendir(dirname); if (dir == NULL) { /* Don't print an error, just shut up and return. */ beep(); free(filename); free(dirname); return NULL; } filenamelen = strlen(filename); while ((nextdir = readdir(dir)) != NULL) { bool skip_match = FALSE; #ifdef DEBUG fprintf(stderr, "Comparing \'%s\'\n", nextdir->d_name); #endif /* See if this matches. */ if (strncmp(nextdir->d_name, filename, filenamelen) == 0 && (*filename == '.' || (strcmp(nextdir->d_name, ".") != 0 && strcmp(nextdir->d_name, "..") != 0))) { /* Cool, found a match. Add it to the list. This makes a * lot more sense to me (Chris) this way... */ char *tmp = charalloc(strlen(dirname) + strlen(nextdir->d_name) + 1); sprintf(tmp, "%s%s", dirname, nextdir->d_name); #ifndef DISABLE_OPERATINGDIR /* ...unless the match exists outside the operating * directory, in which case just go to the next match. */ if (check_operating_dir(tmp, TRUE)) skip_match = TRUE; #endif /* ...or unless the match isn't a directory and allow_files * isn't set, in which case just go to the next match. */ if (!allow_files && !is_dir(tmp)) skip_match = TRUE; free(tmp); if (skip_match) continue; matches = (char **)nrealloc(matches, (*num_matches + 1) * sizeof(char *)); matches[*num_matches] = mallocstrcpy(NULL, nextdir->d_name); ++(*num_matches); } } closedir(dir); free(dirname); free(filename); return matches; } /* Do tab completion. place refers to how much the statusbar cursor * position should be advanced. refresh_func is the function we will * call to refresh the edit window. */ char *input_tab(char *buf, bool allow_files, size_t *place, bool *lastwastab, void (*refresh_func)(void), bool *listed) { size_t num_matches = 0, buf_len; char **matches = NULL; assert(buf != NULL && place != NULL && *place <= strlen(buf) && lastwastab != NULL && refresh_func != NULL && listed != NULL); *listed = FALSE; /* If the word starts with `~' and there is no slash in the word, * then try completing this word as a username. */ if (*place > 0 && *buf == '~') { const char *slash = strchr(buf, '/'); if (slash == NULL || slash >= buf + *place) matches = username_tab_completion(buf, &num_matches, *place); } /* Match against files relative to the current working directory. */ if (matches == NULL) matches = cwd_tab_completion(buf, allow_files, &num_matches, *place); buf_len = strlen(buf); if (num_matches == 0 || *place != buf_len) beep(); else { size_t match, common_len = 0; char *mzero, *glued; const char *lastslash = revstrstr(buf, "/", buf + *place); size_t lastslash_len = (lastslash == NULL) ? 0 : lastslash - buf + 1; char *match1 = charalloc(mb_cur_max()); char *match2 = charalloc(mb_cur_max()); int match1_len, match2_len; /* Get the number of characters that all matches have in common. */ while (TRUE) { match1_len = parse_mbchar(matches[0] + common_len, match1, NULL); for (match = 1; match < num_matches; match++) { match2_len = parse_mbchar(matches[match] + common_len, match2, NULL); if (match1_len != match2_len || strncmp(match1, match2, match2_len) != 0) break; } if (match < num_matches || matches[0][common_len] == '\0') break; common_len += match1_len; } free(match1); free(match2); mzero = charalloc(lastslash_len + common_len + 1); strncpy(mzero, buf, lastslash_len); strncpy(mzero + lastslash_len, matches[0], common_len); common_len += lastslash_len; mzero[common_len] = '\0'; /* Cover also the case of the user specifying a relative path. */ glued = charalloc(strlen(present_path) + strlen(mzero) + 1); sprintf(glued, "%s%s", present_path, mzero); assert(common_len >= *place); if (num_matches == 1 && (is_dir(mzero) || is_dir(glued))) { mzero[common_len++] = '/'; assert(common_len > *place); } if (num_matches > 1 && (common_len != *place || !*lastwastab)) beep(); /* If the matches have something in common, show that part. */ if (common_len != *place) { buf = charealloc(buf, common_len + buf_len - *place + 1); charmove(buf + common_len, buf + *place, buf_len - *place + 1); strncpy(buf, mzero, common_len); *place = common_len; } if (!*lastwastab) *lastwastab = TRUE; else if (num_matches > 1) { int longest_name = 0, ncols, editline = 0; /* Sort the list of available choices. */ qsort(matches, num_matches, sizeof(char *), diralphasort); /* Find the length of the longest among the choices. */ for (match = 0; match < num_matches; match++) { size_t namelen = strlenpt(matches[match]); if (namelen > longest_name) longest_name = namelen; } if (longest_name > COLS - 1) longest_name = COLS - 1; /* Each column will be (longest_name + 2) columns wide, i.e. * two spaces between columns, except that there will be * only one space after the last column. */ ncols = (COLS + 1) / (longest_name + 2); /* Blank the edit window and hide the cursor. */ blank_edit(); curs_set(0); wmove(edit, 0, 0); /* Now print the list of matches out there. */ for (match = 0; match < num_matches; match++) { char *disp; wmove(edit, editline, (longest_name + 2) * (match % ncols)); if (match % ncols == 0 && editline == editwinrows - 1 && num_matches - match > ncols) { waddstr(edit, _("(more)")); break; } disp = display_string(matches[match], 0, longest_name, FALSE); waddstr(edit, disp); free(disp); if ((match + 1) % ncols == 0) editline++; } wnoutrefresh(edit); *listed = TRUE; } free(glued); free(mzero); } free_chararray(matches, num_matches); /* When we didn't list any matches now, refresh the edit window, just * in case a previous tab showed a list, so we know where we are. */ if (!*listed) refresh_func(); return buf; } #endif /* !DISABLE_TABCOMP */ /* Return the filename part of the given path. */ const char *tail(const char *path) { const char *slash = strrchr(path, '/'); if (slash == NULL) return path; else return ++slash; } #ifndef DISABLE_HISTORIES /* Return the constructed dirfile path, or NULL if we can't find the home * directory. The string is dynamically allocated, and should be freed. */ char *construct_filename(const char *str) { char *newstr = NULL; if (homedir != NULL) { size_t homelen = strlen(homedir); newstr = charalloc(homelen + strlen(str) + 1); strcpy(newstr, homedir); strcpy(newstr + homelen, str); } return newstr; } char *histfilename(void) { return construct_filename("/.nano/search_history"); } /* Construct the legacy history filename. * (Deprecate in 2.5, delete later.) */ char *legacyhistfilename(void) { return construct_filename("/.nano_history"); } char *poshistfilename(void) { return construct_filename("/.nano/filepos_history"); } void history_error(const char *msg, ...) { va_list ap; va_start(ap, msg); vfprintf(stderr, _(msg), ap); va_end(ap); fprintf(stderr, _("\nPress Enter to continue\n")); while (getchar() != '\n') ; } /* Now that we have more than one history file, let's just rely on a * .nano dir for this stuff. Return 1 if the dir exists or was * successfully created, and return 0 otherwise. */ int check_dotnano(void) { int ret = 1; struct stat dirstat; char *nanodir = construct_filename("/.nano"); if (stat(nanodir, &dirstat) == -1) { if (mkdir(nanodir, S_IRWXU | S_IRWXG | S_IRWXO) == -1) { history_error(N_("Unable to create directory %s: %s\n" "It is required for saving/loading search history or cursor positions.\n"), nanodir, strerror(errno)); ret = 0; } } else if (!S_ISDIR(dirstat.st_mode)) { history_error(N_("Path %s is not a directory and needs to be.\n" "Nano will be unable to load or save search history or cursor positions.\n"), nanodir); ret = 0; } free(nanodir); return ret; } /* Load the search and replace histories from ~/.nano/search_history. */ void load_history(void) { char *nanohist = histfilename(); char *legacyhist = legacyhistfilename(); struct stat hstat; if (stat(legacyhist, &hstat) != -1 && stat(nanohist, &hstat) == -1) { if (rename(legacyhist, nanohist) == -1) history_error(N_("Detected a legacy nano history file (%s) which I tried to move\n" "to the preferred location (%s) but encountered an error: %s"), legacyhist, nanohist, strerror(errno)); else history_error(N_("Detected a legacy nano history file (%s) which I moved\n" "to the preferred location (%s)\n(see the nano FAQ about this change)"), legacyhist, nanohist); } /* Assume do_rcfile() has reported a missing home directory. */ if (nanohist != NULL) { FILE *hist = fopen(nanohist, "rb"); if (hist == NULL) { if (errno != ENOENT) { /* Don't save history when we quit. */ UNSET(HISTORYLOG); history_error(N_("Error reading %s: %s"), nanohist, strerror(errno)); } } else { /* Load a history list (first the search history, then the * replace history) from the oldest entry to the newest. * Assume the last history entry is a blank line. */ filestruct **history = &search_history; char *line = NULL; size_t buf_len = 0; ssize_t read; while ((read = getline(&line, &buf_len, hist)) >= 0) { if (read > 0 && line[read - 1] == '\n') { read--; line[read] = '\0'; } if (read > 0) { unsunder(line, read); update_history(history, line); } else history = &replace_history; } fclose(hist); free(line); } free(nanohist); free(legacyhist); } } /* Write the lines of a history list, starting with the line at h, to * the open file at hist. Return TRUE if the write succeeded, and FALSE * otherwise. */ bool writehist(FILE *hist, filestruct *h) { filestruct *p; /* Write a history list from the oldest entry to the newest. Assume * the last history entry is a blank line. */ for (p = h; p != NULL; p = p->next) { size_t p_len = strlen(p->data); sunder(p->data); if (fwrite(p->data, sizeof(char), p_len, hist) < p_len || putc('\n', hist) == EOF) return FALSE; } return TRUE; } /* Save the search and replace histories to ~/.nano/search_history. */ void save_history(void) { char *nanohist; /* Don't save unchanged or empty histories. */ if (!history_has_changed() || (searchbot->lineno == 1 && replacebot->lineno == 1)) return; nanohist = histfilename(); if (nanohist != NULL) { FILE *hist = fopen(nanohist, "wb"); if (hist == NULL) fprintf(stderr, _("Error writing %s: %s\n"), nanohist, strerror(errno)); else { /* Make sure no one else can read from or write to the * history file. */ chmod(nanohist, S_IRUSR | S_IWUSR); if (!writehist(hist, searchage) || !writehist(hist, replaceage)) fprintf(stderr, _("Error writing %s: %s\n"), nanohist, strerror(errno)); fclose(hist); } free(nanohist); } } /* Save the recorded last file positions to ~/.nano/filepos_history. */ void save_poshistory(void) { char *poshist = poshistfilename(); char *statusstr = NULL; poshiststruct *posptr; FILE *hist; if (poshist == NULL) return; hist = fopen(poshist, "wb"); if (hist == NULL) fprintf(stderr, _("Error writing %s: %s\n"), poshist, strerror(errno)); else { /* Don't allow others to read or write the history file. */ chmod(poshist, S_IRUSR | S_IWUSR); for (posptr = position_history; posptr != NULL; posptr = posptr->next) { /* Assume 20 decimal positions each for line and column number, * plus two spaces, plus the line feed, plus the null byte. */ statusstr = charalloc(strlen(posptr->filename) + 44); sprintf(statusstr, "%s %ld %ld\n", posptr->filename, (long)posptr->lineno, (long)posptr->xno); if (fwrite(statusstr, sizeof(char), strlen(statusstr), hist) < strlen(statusstr)) fprintf(stderr, _("Error writing %s: %s\n"), poshist, strerror(errno)); free(statusstr); } fclose(hist); } free(poshist); } /* Update the recorded last file positions, given a filename, a line * and a column. If no entry is found, add a new one at the end. */ void update_poshistory(char *filename, ssize_t lineno, ssize_t xpos) { poshiststruct *posptr, *theone, *posprev = NULL; char *fullpath = get_full_path(filename); if (fullpath == NULL || fullpath[strlen(fullpath) - 1] == '/') { free(fullpath); return; } /* Look for a matching filename in the list. */ for (posptr = position_history; posptr != NULL; posptr = posptr->next) { if (!strcmp(posptr->filename, fullpath)) break; posprev = posptr; } /* Don't record files that have the default cursor position. */ if (lineno == 1 && xpos == 1) { if (posptr != NULL) { if (posprev == NULL) position_history = posptr->next; else posprev->next = posptr->next; free(posptr->filename); free(posptr); } free(fullpath); return; } theone = posptr; /* If we didn't find it, make a new node; otherwise, if we're * not at the end, move the matching one to the end. */ if (theone == NULL) { theone = (poshiststruct *)nmalloc(sizeof(poshiststruct)); theone->filename = mallocstrcpy(NULL, fullpath); if (position_history == NULL) position_history = theone; else posprev->next = theone; } else if (posptr->next != NULL) { if (posprev == NULL) position_history = posptr->next; else posprev->next = posptr->next; while (posptr->next != NULL) posptr = posptr->next; posptr->next = theone; } /* Store the last cursor position. */ theone->lineno = lineno; theone->xno = xpos; theone->next = NULL; free(fullpath); } /* Check the recorded last file positions to see if the given file * matches an existing entry. If so, return 1 and set line and column * to the retrieved values. Otherwise, return 0. */ int check_poshistory(const char *file, ssize_t *line, ssize_t *column) { poshiststruct *posptr; char *fullpath = get_full_path(file); if (fullpath == NULL) return 0; for (posptr = position_history; posptr != NULL; posptr = posptr->next) { if (!strcmp(posptr->filename, fullpath)) { *line = posptr->lineno; *column = posptr->xno; free(fullpath); return 1; } } free(fullpath); return 0; } /* Load the recorded file positions from ~/.nano/filepos_history. */ void load_poshistory(void) { char *poshist = poshistfilename(); FILE *hist; /* If the home directory is missing, do_rcfile() will have reported it. */ if (poshist == NULL) return; hist = fopen(poshist, "rb"); if (hist == NULL) { if (errno != ENOENT) { /* When reading failed, don't save history when we quit. */ UNSET(POS_HISTORY); history_error(N_("Error reading %s: %s"), poshist, strerror(errno)); } } else { char *line = NULL, *lineptr, *xptr; size_t buf_len = 0; ssize_t read, count = 0; poshiststruct *record_ptr = NULL, *newrecord; /* Read and parse each line, and store the extracted data. */ while ((read = getline(&line, &buf_len, hist)) > 2) { if (line[read - 1] == '\n') line[--read] = '\0'; unsunder(line, read); lineptr = parse_next_word(line); xptr = parse_next_word(lineptr); /* Create a new position record. */ newrecord = (poshiststruct *)nmalloc(sizeof(poshiststruct)); newrecord->filename = mallocstrcpy(NULL, line); newrecord->lineno = atoi(lineptr); newrecord->xno = atoi(xptr); newrecord->next = NULL; /* Add the record to the list. */ if (position_history == NULL) position_history = newrecord; else record_ptr->next = newrecord; record_ptr = newrecord; /* Impose a limit, so the file will not grow indefinitely. */ if (++count > 200) { poshiststruct *drop_record = position_history; position_history = position_history->next; free(drop_record->filename); free(drop_record); } } fclose(hist); free(line); } free(poshist); } #endif /* !DISABLE_HISTORIES */