/**************************************************************************
* files.c -- This file is part of GNU nano. *
* *
* Copyright (C) 1999-2011, 2013-2020 Free Software Foundation, Inc. *
* Copyright (C) 2015-2020 Benno Schulenberg *
* *
* GNU nano 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 of the License, *
* or (at your option) any later version. *
* *
* GNU nano 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, see http://www.gnu.org/licenses/. *
* *
**************************************************************************/
#include "proto.h"
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#define RW_FOR_ALL (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
#ifndef NANO_TINY
static pid_t pid_of_command = -1;
/* The PID of a forked process -- needed when wanting to abort it. */
#endif
/* Add an item to the circular list of openfile structs. */
void make_new_buffer(void)
{
openfilestruct *newnode = nmalloc(sizeof(openfilestruct));
#ifdef ENABLE_MULTIBUFFER
if (openfile == NULL) {
/* Make the first open file the only element in the list. */
newnode->prev = newnode;
newnode->next = newnode;
startfile = newnode;
} else {
/* 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;
/* There is more than one file open: show "Close" in help lines. */
exitfunc->desc = close_tag;
more_than_one = !inhelp || more_than_one;
}
#endif
/* Make the new buffer the current one, and start initializing it. */
openfile = newnode;
openfile->filename = copy_of("");
openfile->filetop = make_new_node(NULL);
openfile->filetop->data = copy_of("");
openfile->filebot = openfile->filetop;
openfile->current = openfile->filetop;
openfile->current_x = 0;
openfile->placewewant = 0;
openfile->current_y = 0;
openfile->edittop = openfile->filetop;
openfile->firstcolumn = 0;
openfile->totsize = 0;
openfile->modified = FALSE;
#ifdef ENABLE_WRAPPING
openfile->spillage_line = NULL;
#endif
#ifndef NANO_TINY
openfile->mark = NULL;
openfile->fmt = NIX_FILE;
openfile->undotop = NULL;
openfile->current_undo = NULL;
openfile->last_saved = NULL;
openfile->last_action = OTHER;
openfile->statinfo = NULL;
openfile->lock_filename = NULL;
#endif
#ifdef ENABLE_COLOR
openfile->syntax = NULL;
#endif
}
#ifndef NANO_TINY
/* Delete the lockfile. Return TRUE on success, and FALSE otherwise. */
bool delete_lockfile(const char *lockfilename)
{
if (unlink(lockfilename) < 0 && errno != ENOENT) {
statusline(MILD, _("Error deleting lock file %s: %s"),
lockfilename, strerror(errno));
return FALSE;
} else
return TRUE;
}
#define LOCKSIZE 1024
#define SKIPTHISFILE (char *)-1
const char *locking_prefix = ".";
const char *locking_suffix = ".swp";
/* Write a lock file, under the given lockfilename. This always annihilates an
* existing version of that file. Return TRUE on success; FALSE otherwise. */
bool write_lockfile(const char *lockfilename, const char *filename, bool modified)
{
#ifdef HAVE_PWD_H
pid_t mypid = getpid();
uid_t myuid = geteuid();
struct passwd *mypwuid = getpwuid(myuid);
char myhostname[32];
int fd;
FILE *filestream = NULL;
char *lockdata;
size_t wroteamt;
if (mypwuid == NULL) {
/* TRANSLATORS: Keep the next eight messages at most 76 characters. */
statusline(MILD, _("Couldn't determine my identity for lock file"));
return FALSE;
}
if (gethostname(myhostname, 31) < 0 && errno != ENAMETOOLONG) {
statusline(MILD, _("Couldn't determine hostname: %s"), strerror(errno));
return FALSE;
} else
myhostname[31] = '\0';
/* First make sure to remove an existing lock file. */
if (!delete_lockfile(lockfilename))
return FALSE;
/* Create the lock file -- do not accept an existing one. */
fd = open(lockfilename, O_WRONLY|O_CREAT|O_EXCL, RW_FOR_ALL);
if (fd > 0)
filestream = fdopen(fd, "wb");
if (filestream == NULL) {
statusline(MILD, _("Error writing lock file %s: %s"),
lockfilename, strerror(errno));
if (fd > 0)
close(fd);
return FALSE;
}
lockdata = charalloc(LOCKSIZE);
memset(lockdata, 0, LOCKSIZE);
/* This is the lock data we will store (other bytes remain 0x00):
*
* bytes 0-1 - 0x62 0x30
* bytes 2-11 - name of program that created the lock
* bytes 24-27 - PID (little endian) of creator process
* bytes 28-43 - username of the user who created the lock
* bytes 68-99 - hostname of machine from where the lock was created
* bytes 108-876 - filename that the lock is for
* byte 1007 - 0x55 if file is modified
*
* Nano does not write the page size (bytes 12-15), nor the modification
* time (bytes 16-19), nor the inode of the relevant file (bytes 20-23).
* Nano also does not use all available space for user name (40 bytes),
* host name (40 bytes), and file name (890 bytes). Nor does nano write
* some byte-order-checking numbers (bytes 1008-1022). */
lockdata[0] = 0x62;
lockdata[1] = 0x30;
snprintf(&lockdata[2], 10, "nano %s", VERSION);
lockdata[24] = mypid % 256;
lockdata[25] = (mypid / 256) % 256;
lockdata[26] = (mypid / (256 * 256)) % 256;
lockdata[27] = mypid / (256 * 256 * 256);
strncpy(&lockdata[28], mypwuid->pw_name, 16);
strncpy(&lockdata[68], myhostname, 32);
strncpy(&lockdata[108], filename, 768);
lockdata[1007] = (modified) ? 0x55 : 0x00;
wroteamt = fwrite(lockdata, sizeof(char), LOCKSIZE, filestream);
free(lockdata);
if (fclose(filestream) == EOF || wroteamt < LOCKSIZE) {
statusline(MILD, _("Error writing lock file %s: %s"),
lockfilename, strerror(errno));
return FALSE;
}
#endif
return TRUE;
}
/* First check if a lock file already exists. If so, and ask_the_user is TRUE,
* then ask whether to open the corresponding file anyway. Return SKIPTHISFILE
* when the user answers "No", return the name of the lock file on success, and
* return NULL on failure. */
char *do_lockfile(const char *filename, bool ask_the_user)
{
char *namecopy = copy_of(filename);
char *secondcopy = copy_of(filename);
size_t locknamesize = strlen(filename) + strlen(locking_prefix) +
strlen(locking_suffix) + 3;
char *lockfilename = charalloc(locknamesize);
struct stat fileinfo;
snprintf(lockfilename, locknamesize, "%s/%s%s%s", dirname(namecopy),
locking_prefix, basename(secondcopy), locking_suffix);
free(secondcopy);
free(namecopy);
if (!ask_the_user && stat(lockfilename, &fileinfo) != -1)
warn_and_briefly_pause(_("Someone else is also editing this file"));
else if (stat(lockfilename, &fileinfo) != -1) {
char *lockbuf, *question, *pidstring, *postedname, *promptstr;
static char lockprog[11], lockuser[17];
int lockfd, lockpid, room, choice;
ssize_t readamt;
if ((lockfd = open(lockfilename, O_RDONLY)) < 0) {
statusline(ALERT, _("Error opening lock file %s: %s"),
lockfilename, strerror(errno));
free(lockfilename);
return NULL;
}
lockbuf = charalloc(LOCKSIZE);
readamt = read(lockfd, lockbuf, LOCKSIZE);
close(lockfd);
/* If not enough data has been read to show the needed things,
* or the two magic bytes are not there, skip the lock file. */
if (readamt < 68 || lockbuf[0] != 0x62 || lockbuf[1] != 0x30) {
statusline(ALERT, _("Bad lock file is ignored: %s"), lockfilename);
free(lockfilename);
free(lockbuf);
return NULL;
}
strncpy(lockprog, &lockbuf[2], 10);
lockprog[10] = '\0';
lockpid = (((unsigned char)lockbuf[27] * 256 + (unsigned char)lockbuf[26]) * 256 +
(unsigned char)lockbuf[25]) * 256 + (unsigned char)lockbuf[24];
strncpy(lockuser, &lockbuf[28], 16);
lockuser[16] = '\0';
free(lockbuf);
pidstring = charalloc(11);
sprintf (pidstring, "%u", (unsigned int)lockpid);
/* Display newlines in filenames as ^J. */
as_an_at = FALSE;
/* 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 %s); open anyway?");
room = COLS - breadth(question) + 7 - breadth(lockuser) -
breadth(lockprog) - breadth(pidstring);
if (room < 4)
postedname = copy_of("_");
else if (room < breadth(filename)) {
char *fragment = display_string(filename,
breadth(filename) - room + 3, room, FALSE, FALSE);
postedname = charalloc(strlen(fragment) + 4);
strcpy(postedname, "...");
strcat(postedname, fragment);
free(fragment);
} else
postedname = display_string(filename, 0, room, FALSE, FALSE);
/* Allow extra space for username (14), program name (8), PID (8),
* and terminating \0 (1), minus the %s (2) for the file name. */
promptstr = charalloc(strlen(question) + 29 + strlen(postedname));
sprintf(promptstr, question, postedname, lockuser, lockprog, pidstring);
free(postedname);
free(pidstring);
choice = do_yesno_prompt(FALSE, promptstr);
free(promptstr);
/* When the user cancelled while we're still starting up, quit. */
if (choice < 0 && !we_are_running)
finish();
if (choice < 1) {
free(lockfilename);
wipe_statusbar();
return SKIPTHISFILE;
}
}
if (write_lockfile(lockfilename, filename, FALSE))
return lockfilename;
free(lockfilename);
return NULL;
}
/* 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 */
/* Verify that the containing directory of the given filename exists. */
bool has_valid_path(const char *filename)
{
char *namecopy = copy_of(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);
#ifndef NANO_TINY
else if (ISSET(LOCKING) && !ISSET(VIEW_MODE) && access(parentdir, W_OK) < 0)
statusline(MILD, _("Directory '%s' is not writable"), parentdir);
#endif
else
validity = TRUE;
free(namecopy);
return validity;
}
/* Compute and store how many extra rows each line needs when softwrapping. */
void compute_the_extra_rows_per_line(void)
{
#ifndef NANO_TINY
if (ISSET(SOFTWRAP))
for (linestruct *ln = openfile->filetop; ln != NULL; ln = ln->next)
ln->extrarows = extra_chunks_in(ln);
#endif
}
/* This does one of three things. If the filename is "", it just creates
* a new empty buffer. When the filename is not empty, it reads that file
* into a new buffer when requested, otherwise into the existing buffer. */
bool open_buffer(const char *filename, bool new_one)
{
char *realname;
/* The filename after tilde expansion. */
#ifndef NANO_TINY
char *thelocksname = NULL;
#endif
struct stat fileinfo;
int descriptor = 0;
/* Code 0 means new file, -1 means failure, and else it's the fd. */
FILE *f;
/* Display newlines in filenames as ^J. */
as_an_at = FALSE;
#ifdef ENABLE_OPERATINGDIR
if (outside_of_confinement(filename, FALSE)) {
statusline(ALERT, _("Can't read file from outside of %s"), operating_dir);
return FALSE;
}
#endif
realname = real_dir_from_tilde(filename);
/* Don't try to open directories, character files, or block files. */
if (*filename != '\0' && stat(realname, &fileinfo) == 0) {
if (S_ISDIR(fileinfo.st_mode)) {
statusline(ALERT, _("\"%s\" is a directory"), realname);
free(realname);
return FALSE;
}
if (S_ISCHR(fileinfo.st_mode) || S_ISBLK(fileinfo.st_mode)) {
statusline(ALERT, _("\"%s\" is a device file"), realname);
free(realname);
return FALSE;
}
#ifdef NANO_TINY
if (S_ISFIFO(fileinfo.st_mode)) {
statusline(ALERT, _("\"%s\" is a FIFO"), realname);
free(realname);
return FALSE;
}
#endif
}
/* When loading into a new buffer, first check the file's path is valid,
* and then (if requested and possible) create a lock file for it. */
if (new_one && has_valid_path(realname)) {
#ifndef NANO_TINY
if (ISSET(LOCKING) && !ISSET(VIEW_MODE) && filename[0] != '\0') {
thelocksname = do_lockfile(realname, TRUE);
/* When not overriding an existing lock, don't open a buffer. */
if (thelocksname == SKIPTHISFILE) {
free(realname);
return FALSE;
}
}
#endif
}
if (new_one)
make_new_buffer();
/* If we have a filename and are not in NOREAD mode, open the file. */
if (filename[0] != '\0' && !ISSET(NOREAD_MODE))
descriptor = open_file(realname, new_one, &f);
/* If we've successfully opened an existing file, read it in. */
if (descriptor > 0) {
install_handler_for_Ctrl_C();
read_file(f, descriptor, realname, !new_one);
restore_handler_for_Ctrl_C();
#ifndef NANO_TINY
if (openfile->statinfo == NULL)
stat_with_alloc(realname, &openfile->statinfo);
#endif
}
/* When we've loaded a file into a new buffer, set the filename
* and put the cursor at the start of the buffer. */
if (descriptor >= 0 && new_one) {
openfile->filename = mallocstrcpy(openfile->filename, realname);
#ifndef NANO_TINY
openfile->lock_filename = thelocksname;
#endif
openfile->current = openfile->filetop;
openfile->current_x = 0;
openfile->placewewant = 0;
}
compute_the_extra_rows_per_line();
#ifdef ENABLE_COLOR
/* If a new buffer was opened, check whether a syntax can be applied. */
if (new_one)
find_and_prime_applicable_syntax();
#endif
free(realname);
return TRUE;
}
/* Mark the current file as modified if it isn't already, and
* then update the title bar to display the file's new status. */
void set_modified(void)
{
if (openfile->modified)
return;
openfile->modified = TRUE;
titlebar(NULL);
#ifndef NANO_TINY
if (openfile->lock_filename != NULL)
write_lockfile(openfile->lock_filename, openfile->filename, TRUE);
#endif
}
/* Update the title bar and the multiline cache to match the current buffer. */
void prepare_for_display(void)
{
/* Update the title bar, since the filename may have changed. */
if (!inhelp)
titlebar(NULL);
#ifdef ENABLE_COLOR
/* Precalculate the data for any multiline coloring regexes. */
precalc_multicolorinfo();
have_palette = FALSE;
#endif
refresh_needed = TRUE;
}
#ifdef ENABLE_MULTIBUFFER
/* Show name of current buffer and its number of lines on the status bar. */
void mention_name_and_linecount(void)
{
size_t count = openfile->filebot->lineno -
(openfile->filebot->data[0] == '\0' ? 1 : 0);
#ifndef NANO_TINY
if (openfile->fmt != NIX_FILE)
/* TRANSLATORS: First %s is file name, second %s is file format. */
statusline(HUSH, P_("%s -- %zu line (%s)", "%s -- %zu lines (%s)", count),
openfile->filename[0] == '\0' ?
_("New Buffer") : tail(openfile->filename), count,
openfile->fmt == DOS_FILE ? _("DOS") : _("Mac"));
else
#endif
statusline(HUSH, P_("%s -- %zu line", "%s -- %zu lines", count),
openfile->filename[0] == '\0' ?
_("New Buffer") : tail(openfile->filename), count);
}
/* Update title bar and such after switching to another buffer.*/
void redecorate_after_switch(void)
{
/* If only one file buffer is open, there is nothing to update. */
if (openfile == openfile->next) {
statusbar(_("No more open file buffers"));
return;
}
#ifndef NANO_TINY
/* While in a different buffer, the screen may have been resized
* or softwrap mode may have been toggled, so make sure that the
* starting column for the first row gets an appropriate value. */
ensure_firstcolumn_is_aligned();
compute_the_extra_rows_per_line();
#endif
/* Update title bar and multiline info to match the current buffer. */
prepare_for_display();
/* Ensure that the main loop will redraw the help lines. */
currmenu = MMOST;
/* Prevent a possible Shift selection from getting cancelled. */
shift_held = TRUE;
/* Indicate on the status bar where we switched to. */
mention_name_and_linecount();
}
/* Switch to the previous entry in the list of open files. */
void switch_to_prev_buffer(void)
{
openfile = openfile->prev;
redecorate_after_switch();
}
/* Switch to the next entry in the list of open files. */
void switch_to_next_buffer(void)
{
openfile = openfile->next;
redecorate_after_switch();
}
/* Remove the current buffer from the circular list of buffers. */
void close_buffer(void)
{
openfilestruct *orphan = openfile;
if (orphan == startfile)
startfile = startfile->next;
orphan->prev->next = orphan->next;
orphan->next->prev = orphan->prev;
free(orphan->filename);
free_lines(orphan->filetop);
#ifndef NANO_TINY
free(orphan->statinfo);
free(orphan->lock_filename);
/* Free the undo stack. */
discard_until(NULL);
#endif
openfile = orphan->prev;
free(orphan);
/* When just one buffer remains open, show "Exit" in the help lines. */
if (openfile == openfile->next)
exitfunc->desc = exit_tag;
}
#endif /* ENABLE_MULTIBUFFER */
/* Encode any NUL bytes in the given line of text (of the given length),
* and return a dynamically allocated copy of the resultant string. */
char *encode_data(char *text, size_t length)
{
recode_NUL_to_LF(text, length);
text[length] = '\0';
return copy_of(text);
}
/* The number of bytes by which we expand the line buffer while reading. */
#define LUMPSIZE 120
/* Read the given open file f into the current buffer. filename should be
* set to the name of the file. undoable means that undo records should be
* created and that the file does not need to be checked for writability. */
void read_file(FILE *f, int fd, const char *filename, bool undoable)
{
ssize_t was_lineno = openfile->current->lineno;
/* The line number where we start the insertion. */
size_t was_leftedge = 0;
/* The leftedge where we start the insertion. */
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 bufsize = LUMPSIZE;
/* The size of the line buffer; increased as needed. */
char *buf = charalloc(bufsize);
/* The buffer in which we assemble each line of the file. */
linestruct *topline;
/* The top of the new buffer where we store the read file. */
linestruct *bottomline;
/* The bottom of the new buffer. */
int onevalue;
/* The current value we read from the file, either a byte or EOF. */
int errornumber;
/* The error code, in case an error occurred during reading. */
bool writable = TRUE;
/* Whether the file is writable (in case we care). */
#ifndef NANO_TINY
int format = 0;
/* 0 = Unix, 1 = DOS, 2 = Mac. */
#endif
#ifndef NANO_TINY
if (undoable)
add_undo(INSERT, NULL);
if (ISSET(SOFTWRAP))
was_leftedge = leftedge_for(xplustabs(), openfile->current);
#endif
/* Create an empty buffer. */
topline = make_new_node(NULL);
bottomline = topline;
#ifndef NANO_TINY
block_sigwinch(TRUE);
#endif
/* Lock the file before starting to read it, to avoid the overhead
* of locking it for each single byte that we read from it. */
flockfile(f);
control_C_was_pressed = FALSE;
/* Read in the entire file, byte by byte, line by line. */
while ((onevalue = getc_unlocked(f)) != EOF) {
char input = (char)onevalue;
if (control_C_was_pressed) {
statusline(ALERT, _("Interrupted"));
break;
}
/* When the byte before the current one is a CR and we're doing
* format conversion, then strip this CR when it's before a LF
* OR when the file is in Mac format. Also, when still on the
* first line, set the format to either DOS (1) or Mac (2). */
if (input == '\n') {
#ifndef NANO_TINY
if (len > 0 && buf[len - 1] == '\r' && !ISSET(NO_CONVERT)) {
if (num_lines == 0)
format = 1;
len--;
}
} else if ((num_lines == 0 || format == 2) &&
len > 0 && buf[len - 1] == '\r' && !ISSET(NO_CONVERT)) {
format = 2;
len--;
#endif
} else {
/* Store the byte. */
buf[len] = input;
/* Keep track of the total length of the line. It might have
* NUL bytes in it, so we can't just use strlen() later. */
len++;
/* When needed, increase the line-buffer size. Don't bother
* decreasing it -- it gets freed when reading is finished. */
if (len == bufsize) {
bufsize += LUMPSIZE;
buf = charealloc(buf, bufsize);
}
continue;
}
/* Store the data and make a new line. */
bottomline->data = encode_data(buf, len);
bottomline->next = make_new_node(bottomline);
bottomline = bottomline->next;
num_lines++;
/* Reset the length in preparation for the next line. */
len = 0;
#ifndef NANO_TINY
/* If it was a Mac line, then store the byte after the \r
* as the first byte of the next line. */
if (input != '\n')
buf[len++] = input;
#endif
}
errornumber = errno;
/* We are done with the file, unlock it. */
funlockfile(f);
#ifndef NANO_TINY
block_sigwinch(FALSE);
#endif
/* When reading from stdin, restore the terminal and reenter curses mode. */
if (isendwin()) {
if (!isatty(STANDARD_INPUT))
reconnect_and_store_state();
terminal_init();
doupdate();
}
/* If there was a real error during the reading, let the user know. */
if (ferror(f) && errornumber != EINTR && errornumber != 0)
statusline(ALERT, strerror(errornumber));
fclose(f);
if (fd > 0 && !undoable && !ISSET(VIEW_MODE))
writable = (access(filename, W_OK) == 0);
/* If the file ended with newline, or it was entirely empty, make the
* last line blank. Otherwise, put the last read data in. */
if (len == 0)
bottomline->data = copy_of("");
else {
#ifndef NANO_TINY
bool mac_line_needs_newline = FALSE;
/* If the final character is a CR and file conversion isn't disabled,
* strip this CR and indicate that an extra blank line is needed. */
if (buf[len - 1] == '\r' && !ISSET(NO_CONVERT)) {
if (num_lines == 0)
format = 2;
buf[--len] = '\0';
mac_line_needs_newline = TRUE;
}
#endif
/* Store the data of the final line. */
bottomline->data = encode_data(buf, len);
num_lines++;
#ifndef NANO_TINY
if (mac_line_needs_newline) {
bottomline->next = make_new_node(bottomline);
bottomline = bottomline->next;
bottomline->data = copy_of("");
}
#endif
}
free(buf);
/* Insert the just read buffer into the current one. */
ingraft_buffer(topline);
/* Set the desired x position at the end of what was inserted. */
openfile->placewewant = xplustabs();
if (!writable)
statusline(ALERT, _("File '%s' is unwritable"), filename);
#ifndef NANO_TINY
else if (format == 2) {
/* TRANSLATORS: Keep the next three messages at most 78 characters. */
openfile->fmt = MAC_FILE;
statusline(HUSH, P_("Read %zu line (Converted from Mac format)",
"Read %zu lines (Converted from Mac format)",
num_lines), num_lines);
} else if (format == 1) {
openfile->fmt = DOS_FILE;
statusline(HUSH, P_("Read %zu line (Converted from DOS format)",
"Read %zu lines (Converted from DOS format)",
num_lines), num_lines);
}
#endif
else
statusline(HUSH, P_("Read %zu line", "Read %zu lines",
num_lines), num_lines);
/* If we inserted less than a screenful, don't center the cursor. */
if (undoable && less_than_a_screenful(was_lineno, was_leftedge))
focusing = FALSE;
#ifndef NANO_TINY
if (undoable)
update_undo(INSERT);
if (ISSET(MAKE_IT_UNIX))
openfile->fmt = NIX_FILE;
#endif
}
/* Open the file with the given name. If the file does not exist, display
* "New File" if new_one is TRUE, and say "File not found" otherwise.
* Return 0 if we say "New File", -1 upon failure, and the obtained file
* descriptor otherwise. The opened filestream is returned in *f. */
int open_file(const char *filename, bool new_one, FILE **f)
{
char *full_filename = get_full_path(filename);
struct stat fileinfo;
int fd;
/* If the absolute path is unusable (due to some component's permissions),
* try the given path instead (as it is probably relative). */
if (full_filename == NULL || stat(full_filename, &fileinfo) == -1)
full_filename = mallocstrcpy(full_filename, filename);
if (stat(full_filename, &fileinfo) == -1) {
free(full_filename);
if (new_one) {
statusbar(_("New File"));
return 0;
} else {
statusline(ALERT, _("File \"%s\" not found"), filename);
return -1;
}
}
#ifndef NANO_TINY
if (S_ISFIFO(fileinfo.st_mode))
statusbar(_("Reading from FIFO..."));
block_sigwinch(TRUE);
install_handler_for_Ctrl_C();
#endif
/* Try opening the file. */
fd = open(full_filename, O_RDONLY);
#ifndef NANO_TINY
restore_handler_for_Ctrl_C();
block_sigwinch(FALSE);
#endif
if (fd == -1) {
if (errno == EINTR || errno == 0)
statusline(ALERT, _("Interrupted"));
else
statusline(ALERT, _("Error reading %s: %s"), filename, strerror(errno));
} else {
/* The file is A-OK. Associate a stream with it. */
*f = fdopen(fd, "rb");
if (*f == NULL) {
statusline(ALERT, _("Error reading %s: %s"), filename, strerror(errno));
close(fd);
fd = -1;
} else
statusbar(_("Reading..."));
}
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;
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);
}
/* There is no possible save file: blank out the filename. */
*buf = '\0';
return buf;
}
#ifndef NANO_TINY
/* Send an unconditional kill signal to the running external command. */
RETSIGTYPE cancel_the_command(int signal)
{
kill(pid_of_command, SIGKILL);
}
/* Send the text that starts at the given line to file descriptor fd. */
void send_data(const linestruct *line, int fd)
{
FILE *tube = fdopen(fd, "w");
if (tube == NULL)
exit(4);
/* Send each line, except a final empty line. */
while (line != NULL && (line->next != NULL || line->data[0] != '\0')) {
fprintf(tube, "%s%s", line->data, line->next == NULL ? "" : "\n");
line = line->next;
}
fclose(tube);
}
/* Execute the given command in a shell. Return TRUE on success. */
bool execute_command(const char *command)
{
int from_fd[2], to_fd[2];
/* The pipes through which text will be written and read. */
const bool should_pipe = (command[0] == '|');
FILE *stream;
struct sigaction oldaction, newaction = {{0}};
/* Original and temporary handlers for SIGINT. */
/* Create a pipe to read the command's output from, and, if needed,
* a pipe to feed the command's input through. */
if (pipe(from_fd) == -1 || (should_pipe && pipe(to_fd) == -1)) {
statusline(ALERT, _("Could not create pipe"));
return FALSE;
}
/* Fork a child process to run the command in. */
if ((pid_of_command = fork()) == 0) {
const char *theshell = getenv("SHELL");
if (theshell == NULL)
theshell = (char *)"/bin/sh";
/* Child: close the unused read end of the output pipe. */
close(from_fd[0]);
/* Connect the write end of the output pipe to the process' output streams. */
dup2(from_fd[1], fileno(stdout));
dup2(from_fd[1], fileno(stderr));
/* If the parent sends text, connect the read end of the
* feeding pipe to the child's input stream. */
if (should_pipe) {
dup2(to_fd[0], fileno(stdin));
close(to_fd[1]);
}
/* Run the given command inside the preferred shell. */
execl(theshell, tail(theshell), "-c", should_pipe ? &command[1] : command, NULL);
/* If the exec call returns, there was an error. */
exit(1);
}
/* Parent: close the unused write end of the pipe. */
close(from_fd[1]);
if (pid_of_command == -1) {
statusline(ALERT, _("Could not fork"));
close(from_fd[0]);
return FALSE;
}
statusbar(_("Executing..."));
/* If the command starts with "|", pipe buffer or region to the command. */
if (should_pipe) {
linestruct *was_cutbuffer = cutbuffer;
bool whole_buffer = FALSE;
cutbuffer = NULL;
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER)) {
openfile = openfile->prev;
if (openfile->mark)
copy_marked_region();
else
whole_buffer = TRUE;
} else
#endif
{
/* TRANSLATORS: This one goes with Undid/Redid messages. */
add_undo(COUPLE_BEGIN, N_("filtering"));
if (openfile->mark == NULL) {
openfile->current = openfile->filetop;
openfile->current_x = 0;
}
add_undo(CUT, NULL);
do_snip(openfile->mark != NULL, openfile->mark == NULL, FALSE);
openfile->filetop->has_anchor = FALSE;
update_undo(CUT);
}
/* Create a separate process for piping the data to the command. */
if (fork() == 0) {
send_data(whole_buffer ? openfile->filetop : cutbuffer, to_fd[1]);
exit(0);
}
close(to_fd[0]);
close(to_fd[1]);
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER))
openfile = openfile->next;
#endif
free_lines(cutbuffer);
cutbuffer = was_cutbuffer;
}
/* Re-enable interpretation of the special control keys so that we get
* SIGINT when Ctrl-C is pressed. */
enable_kb_interrupt();
/* Set up a signal handler so that ^C will terminate the forked process. */
newaction.sa_handler = cancel_the_command;
newaction.sa_flags = 0;
sigaction(SIGINT, &newaction, &oldaction);
stream = fdopen(from_fd[0], "rb");
if (stream == NULL)
statusline(ALERT, _("Failed to open pipe: %s"), strerror(errno));
else
read_file(stream, 0, "pipe", TRUE);
if (should_pipe && !ISSET(MULTIBUFFER))
add_undo(COUPLE_END, N_("filtering"));
/* Wait for the external command (and possibly data sender) to terminate. */
wait(NULL);
if (should_pipe)
wait(NULL);
/* Restore the original handler for SIGINT. */
sigaction(SIGINT, &oldaction, NULL);
/* Restore the terminal to its desired state, and disable
* interpretation of the special control keys again. */
terminal_init();
return TRUE;
}
#endif /* NANO_TINY */
/* Insert a file into the current buffer, or into a new buffer when
* the MULTIBUFFER flag is set. */
void do_insertfile(bool execute)
{
int response;
const char *msg;
char *given = copy_of("");
/* The last answer the user typed at the status-bar prompt. */
#ifndef NANO_TINY
format_type was_fmt = openfile->fmt;
#endif
/* Display newlines in filenames as ^J. */
as_an_at = FALSE;
/* Reset the flag that is set by the Spell Checker and Linter and such. */
ran_a_tool = FALSE;
while (TRUE) {
#ifndef NANO_TINY
if (execute) {
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER))
/* TRANSLATORS: The next six messages are prompts. */
msg = _("Command to execute in new buffer");
else
#endif
msg = _("Command to execute");
} else
#endif
{
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER))
#ifndef NANO_TINY
if ISSET(NO_CONVERT)
msg = _("File to read unconverted into new buffer [from %s]");
else
#endif
msg = _("File to read into new buffer [from %s]");
else
#endif
#ifndef NANO_TINY
if ISSET(NO_CONVERT)
msg = _("File to insert unconverted [from %s]");
else
#endif
msg = _("File to insert [from %s]");
}
present_path = mallocstrcpy(present_path, "./");
response = do_prompt(TRUE, TRUE,
#ifndef NANO_TINY
execute ? MEXECUTE :
#endif
MINSERTFILE, given,
#ifndef NANO_TINY
execute ? &execute_history :
#endif
NULL, edit_refresh, msg,
#ifdef ENABLE_OPERATINGDIR
operating_dir != NULL ? operating_dir :
#endif
"./");
/* If we're in multibuffer mode and the filename or command is
* blank, open a new buffer instead of canceling. */
if (response == -1 || (response == -2 && !ISSET(MULTIBUFFER))) {
statusbar(_("Cancelled"));
break;
} else {
ssize_t was_current_lineno = openfile->current->lineno;
size_t was_current_x = openfile->current_x;
#if !defined(NANO_TINY) || defined(ENABLE_BROWSER) || defined(ENABLE_MULTIBUFFER)
functionptrtype func = func_from_key(&response);
#endif
given = mallocstrcpy(given, answer);
if (ran_a_tool)
break;
#ifdef ENABLE_MULTIBUFFER
if (func == flip_newbuffer) {
/* Allow toggling only when not in view mode. */
if (!ISSET(VIEW_MODE))
TOGGLE(MULTIBUFFER);
else
beep();
continue;
}
#endif
#ifndef NANO_TINY
if (func == flip_convert) {
TOGGLE(NO_CONVERT);
continue;
}
if (func == flip_execute) {
execute = !execute;
continue;
}
if (func == flip_pipe) {
add_or_remove_pipe_symbol_from_answer();
given = mallocstrcpy(given, answer);
continue;
}
#endif
#ifdef ENABLE_BROWSER
if (func == to_files) {
char *chosen = do_browse_from(answer);
/* If no file was chosen, go back to the prompt. */
if (chosen == NULL)
continue;
free(answer);
answer = chosen;
response = 0;
}
#endif
/* If we don't have a file yet, go back to the prompt. */
if (response != 0 && (!ISSET(MULTIBUFFER) || response != -2))
continue;
#ifndef NANO_TINY
if (execute) {
#ifdef ENABLE_MULTIBUFFER
/* When in multibuffer mode, first open a blank buffer. */
if (ISSET(MULTIBUFFER))
open_buffer("", TRUE);
#endif
/* If the command is not empty, execute it and read its output
* into the buffer, and add the command to the history list. */
if (*answer != '\0') {
execute_command(answer);
#ifdef ENABLE_HISTORIES
update_history(&execute_history, answer);
#endif
}
#ifdef ENABLE_MULTIBUFFER
/* If this is a new buffer, put the cursor at the top. */
if (ISSET(MULTIBUFFER)) {
openfile->current = openfile->filetop;
openfile->current_x = 0;
openfile->placewewant = 0;
set_modified();
}
#endif
} else
#endif /* !NANO_TINY */
{
/* Make sure the specified path is tilde-expanded. */
answer = free_and_assign(answer, real_dir_from_tilde(answer));
/* Read the file into a new buffer or into current buffer. */
open_buffer(answer, ISSET(MULTIBUFFER));
}
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER)) {
#ifdef ENABLE_HISTORIES
if (ISSET(POSITIONLOG)) {
ssize_t priorline, priorcol;
#ifndef NANO_TINY
if (!execute)
#endif
if (has_old_position(answer, &priorline, &priorcol))
do_gotolinecolumn(priorline, priorcol, FALSE, FALSE);
}
#endif
/* Update title bar and color info for this new buffer. */
prepare_for_display();
} else
#endif /* ENABLE_MULTIBUFFER */
{
/* If the file actually changed, mark it as modified. */
if (openfile->current->lineno != was_current_lineno ||
openfile->current_x != was_current_x)
set_modified();
#ifndef NANO_TINY
/* Ensure that the buffer retains the format that it had. */
openfile->fmt = was_fmt;
#endif
refresh_needed = TRUE;
}
break;
}
}
free(given);
}
/* If the current mode of operation allows it, go insert a file. */
void do_insertfile_void(void)
{
if (!in_restricted_mode())
do_insertfile(FALSE);
}
#ifndef NANO_TINY
/* If the current mode of operation allows it, go prompt for a command. */
void do_execute(void)
{
if (!in_restricted_mode())
do_insertfile(TRUE);
}
#endif
/* For the given bare path (or path plus filename), return the canonical,
* absolute path (plus filename) when the path exists, and NULL when not. */
char *get_full_path(const char *origpath)
{
char *allocation, *here, *target, *last_slash;
char *just_filename = NULL;
int attempts = 0;
struct stat fileinfo;
bool path_only;
if (origpath == NULL)
return NULL;
allocation = charalloc(PATH_MAX + 1);
here = getcwd(allocation, PATH_MAX + 1);
/* If getting the current directory failed, go up one level and try again,
* until we find an existing directory, and use that as the current one. */
while (here == NULL && attempts < 20) {
IGNORE_CALL_RESULT(chdir(".."));
here = getcwd(allocation, PATH_MAX + 1);
attempts++;
}
/* If we found a directory, make sure its path ends in a slash. */
if (here != NULL) {
if (strcmp(here, "/") != 0) {
here = charealloc(here, strlen(here) + 2);
strcat(here, "/");
}
} else {
here = copy_of("");
free(allocation);
}
target = real_dir_from_tilde(origpath);
/* Determine whether the target path refers to a directory. If stat()ing
* target fails, however, assume that it refers to a new, unsaved file. */
path_only = (stat(target, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode));
/* If the target is a directory, make sure its path ends in a slash. */
if (path_only) {
size_t length = strlen(target);
if (target[length - 1] != '/') {
target = charealloc(target, length + 2);
strcat(target, "/");
}
}
last_slash = strrchr(target, '/');
/* If the target path does not contain a slash, then it is a bare filename
* and must therefore be located in the working directory. */
if (last_slash == NULL) {
just_filename = target;
target = here;
} else {
/* If target contains a filename, separate the two. */
if (!path_only) {
just_filename = copy_of(last_slash + 1);
*(last_slash + 1) = '\0';
}
/* If we can't change to the target directory, give up. Otherwise,
* get the canonical path to this target directory. */
if (chdir(target) == -1) {
free(target);
target = NULL;
} else {
free(target);
allocation = charalloc(PATH_MAX + 1);
target = getcwd(allocation, PATH_MAX + 1);
/* If we got a result, make sure it ends in a slash.
* Otherwise, ensure that we return NULL. */
if (target != NULL) {
if (strcmp(target, "/") != 0) {
target = charealloc(target, strlen(target) + 2);
strcat(target, "/");
}
} else {
path_only = TRUE;
free(allocation);
}
/* Finally, go back to where we were before. We don't check
* for an error, since we can't do anything if we get one. */
IGNORE_CALL_RESULT(chdir(here));
}
free(here);
}
/* If we were given more than a bare path, concatenate the target path
* with the filename portion to get the full, absolute file path. */
if (!path_only && target != NULL) {
target = charealloc(target, strlen(target) + strlen(just_filename) + 1);
strcat(target, just_filename);
}
free(just_filename);
return target;
}
/* Check whether the given path refers to a directory that is writable.
* Return the absolute form of the path on success, and NULL on failure. */
char *check_writable_directory(const char *path)
{
char *full_path = get_full_path(path);
if (full_path == NULL)
return NULL;
if (full_path[strlen(full_path) - 1] != '/' || access(full_path, W_OK) != 0) {
free(full_path);
return NULL;
}
return full_path;
}
/* Create, safely, a temporary file in the standard temp directory.
* On success, return the malloc()ed filename, plus the corresponding
* file stream opened in read-write mode. On error, return NULL. */
char *safe_tempfile(FILE **stream)
{
const char *env_dir = getenv("TMPDIR");
char *tempdir = NULL, *tempfile_name = NULL;
int fd;
/* Get the absolute path for the first directory among $TMPDIR
* and P_tmpdir that is writable, otherwise use /tmp/. */
if (env_dir != NULL)
tempdir = check_writable_directory(env_dir);
if (tempdir == NULL)
tempdir = check_writable_directory(P_tmpdir);
if (tempdir == NULL)
tempdir = copy_of("/tmp/");
tempfile_name = charealloc(tempdir, strlen(tempdir) + 12);
strcat(tempfile_name, "nano.XXXXXX");
fd = mkstemp(tempfile_name);
if (fd == -1) {
free(tempfile_name);
return NULL;
}
*stream = fdopen(fd, "r+b");
return tempfile_name;
}
#ifdef ENABLE_OPERATINGDIR
/* Change to the specified operating directory, when it's valid. */
void init_operating_dir(void)
{
char *target = get_full_path(operating_dir);
/* If the operating directory is inaccessible, fail. */
if (target == NULL || chdir(target) == -1)
die(_("Invalid operating directory: %s\n"), operating_dir);
free(operating_dir);
operating_dir = charealloc(target, strlen(target) + 1);
}
/* Check whether the given path is outside of the operating directory.
* Return TRUE if it is, and FALSE otherwise. If allow_tabcomp is TRUE,
* incomplete names that can grow into matches for the operating directory
* are considered to be inside, so that tab completion will work. */
bool outside_of_confinement(const char *currpath, bool allow_tabcomp)
{
char *fullpath;
bool is_inside, begins_to_be;
/* If no operating directory is set, there is nothing to check. */
if (operating_dir == NULL)
return FALSE;
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 is outside the
* operating directory. */
if (fullpath == NULL)
return allow_tabcomp;
is_inside = (strstr(fullpath, operating_dir) == fullpath);
begins_to_be = (allow_tabcomp &&
strstr(operating_dir, fullpath) == operating_dir);
free(fullpath);
return (!is_inside && !begins_to_be);
}
#endif
#ifndef NANO_TINY
/* Transform the specified backup directory to an absolute path,
* and verify that it is usable. */
void init_backup_dir(void)
{
char *target = get_full_path(backup_dir);
/* If we can't get an absolute path (which means it doesn't exist or
* isn't accessible), or it's not a directory, fail. */
if (target == NULL || target[strlen(target) - 1] != '/')
die(_("Invalid backup directory: %s\n"), backup_dir);
free(backup_dir);
backup_dir = charealloc(target, strlen(target) + 1);
}
/* Report the reason why the backup failed and ask what to do. Return TRUE
* when the user wants to save the file itself anyway. But refuse to go on
* if the backup failed due to a lack of space. */
bool user_wants_to_proceed(void)
{
warn_and_briefly_pause(strerror(errno));
if (errno == ENOSPC) {
currmenu = MMOST;
return FALSE;
} else
return (do_yesno_prompt(FALSE, _("Cannot make backup; "
"continue and save the file? ")) == 1);
}
#endif /* !NANO_TINY */
/* Read all data from inn, and write it to out. File inn must be open for
* reading, and out for writing. Return 0 on success, a negative number on
* read error, and a positive number on write error. File inn is always
* closed by this function, out is closed only if close_out is true. */
int copy_file(FILE *inn, FILE *out, bool close_out)
{
int retval = 0;
char buf[BUFSIZ];
size_t charsread;
int (*flush_out_fnc)(FILE *) = (close_out) ? fclose : fflush;
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 = -3;
if (flush_out_fnc(out) == EOF)
retval = 4;
return retval;
}
/* Write the current buffer to disk. If thefile isn't NULL, we write to a
* temporary file that is already open. If tmp is TRUE (when spell checking
* or emergency dumping, for example), we set the umask to disallow anyone else
* from accessing the file, and don't print out how many lines we wrote on the
* status bar. If method is APPEND or PREPEND, it means we will be appending
* or prepending instead of overwriting the given file. If fullbuffer is TRUE
* and when writing normally, we set the current filename and stat info.
* Return TRUE on success, and FALSE otherwise. */
bool write_file(const char *name, FILE *thefile, bool tmp,
kind_of_writing_type method, bool fullbuffer)
{
#ifndef NANO_TINY
bool is_existing_file;
/* Becomes TRUE when the file is non-temporary and exists. */
struct stat st;
/* The status fields filled in by stat(). */
char *backupname = NULL;
/* The name of the backup file, in case we make one. */
#endif
char *realname = real_dir_from_tilde(name);
/* The filename after tilde expansion. */
char *tempname = NULL;
/* The name of the temporary file we use when prepending. */
linestruct *line = openfile->filetop;
/* An iterator for moving through the lines of the buffer. */
size_t lineswritten = 0;
/* The number of lines written, for feedback on the status bar. */
bool retval = FALSE;
/* The return value, to become TRUE when writing has succeeded. */
#ifdef ENABLE_OPERATINGDIR
/* If we're writing a temporary file, we're probably going outside
* the operating directory, so skip the operating directory test. */
if (!tmp && outside_of_confinement(realname, FALSE)) {
statusline(ALERT, _("Can't write outside of %s"), operating_dir);
goto cleanup_and_exit;
}
#endif
#ifndef NANO_TINY
/* Check whether the file (at the end of the symlink) exists. */
is_existing_file = (!tmp) && (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 and such during backup. */
if (openfile->statinfo == NULL && is_existing_file)
stat_with_alloc(realname, &openfile->statinfo);
/* When the user requested a backup, we do this only if the file exists and
* isn't temporary AND the file has not been modified by someone else since
* we opened it (or we are appending/prepending or writing a selection). */
if (ISSET(MAKE_BACKUP) && is_existing_file && openfile->statinfo &&
(openfile->statinfo->st_mtime == st.st_mtime ||
method != OVERWRITE || openfile->mark)) {
static struct timespec filetime[2];
int backup_cflags, backup_fd, verdict;
FILE *original = NULL, *backup_file = NULL;
/* Remember the original file's access and modification times. */
filetime[0].tv_sec = openfile->statinfo->st_atime;
filetime[1].tv_sec = openfile->statinfo->st_mtime;
/* Open the file of which a backup must be made. */
original = fopen(realname, "rb");
/* If we can't read from the original file, go on, since saving
* only the current buffer is better than saving nothing. */
if (original == NULL) {
statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno));
goto skip_backup;
}
/* If no backup directory was specified, we make a simple backup
* by appending a tilde to the original file name. Otherwise,
* we create a numbered backup in the specified directory. */
if (backup_dir == NULL) {
backupname = charalloc(strlen(realname) + 2);
sprintf(backupname, "%s~", realname);
} else {
char *backuptemp = get_full_path(realname);
/* If we have a valid absolute path, replace each slash
* in this full path with an exclamation mark. Otherwise,
* just use the file-name portion of the given path. */
if (backuptemp) {
for (int i = 0; backuptemp[i] != '\0'; i++)
if (backuptemp[i] == '/')
backuptemp[i] = '!';
} else
backuptemp = copy_of(tail(realname));
backupname = charalloc(strlen(backup_dir) + strlen(backuptemp) + 1);
sprintf(backupname, "%s%s", backup_dir, backuptemp);
free(backuptemp);
backuptemp = get_next_filename(backupname, "~");
free(backupname);
backupname = backuptemp;
/* If all numbered backup names are taken, the user must
* be fond of backups. Thus, without one, do not go on. */
if (*backupname == '\0') {
statusline(ALERT, _("Too many existing backup files"));
goto cleanup_and_exit;
}
}
/* Now first try to delete an existing backup file. */
if (unlink(backupname) < 0 && errno != ENOENT && !ISSET(INSECURE_BACKUP)) {
warn_and_briefly_pause(_("Cannot delete existing backup"));
if (user_wants_to_proceed())
goto skip_backup;
statusline(HUSH, _("Cannot delete backup %s: %s"),
backupname, strerror(errno));
goto cleanup_and_exit;
}
if (ISSET(INSECURE_BACKUP))
backup_cflags = O_WRONLY | O_CREAT | O_TRUNC;
else
backup_cflags = O_WRONLY | O_CREAT | O_EXCL;
/* Create the backup file (or truncate the existing one). */
backup_fd = open(backupname, backup_cflags, S_IRUSR|S_IWUSR);
if (backup_fd >= 0)
backup_file = fdopen(backup_fd, "wb");
if (backup_file == NULL) {
warn_and_briefly_pause(_("Cannot create backup file"));
if (user_wants_to_proceed())
goto skip_backup;
statusline(HUSH, _("Cannot create backup %s: %s"),
backupname, strerror(errno));
goto cleanup_and_exit;
}
/* Try to change owner and group to those of the original file;
* ignore errors, as a normal user cannot change the owner. */
IGNORE_CALL_RESULT(fchown(backup_fd, openfile->statinfo->st_uid,
openfile->statinfo->st_gid));
/* Set the backup's permissions to those of the original file.
* It is not a security issue if this fails, as we have created
* the file with just read and write permission for the owner. */
IGNORE_CALL_RESULT(fchmod(backup_fd, openfile->statinfo->st_mode));
/* Copy the existing file to the backup. */
verdict = copy_file(original, backup_file, FALSE);
if (verdict < 0) {
fclose(backup_file);
statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno));
goto cleanup_and_exit;
} else if (verdict > 0) {
fclose(backup_file);
warn_and_briefly_pause(_("Cannot write backup"));
if (user_wants_to_proceed())
goto skip_backup;
statusline(HUSH, _("Cannot write backup %s: %s"),
backupname, strerror(errno));
goto cleanup_and_exit;
}
/* Set the backup's timestamps to those of the original file.
* Failure is unimportant: saving the file apparently worked. */
IGNORE_CALL_RESULT(futimens(backup_fd, filetime));
if (fclose(backup_file) != 0) {
warn_and_briefly_pause(_("Cannot write backup"));
if (user_wants_to_proceed())
goto skip_backup;
statusline(HUSH, _("Cannot write backup %s: %s"),
backupname, strerror(errno));
goto cleanup_and_exit;
}
}
skip_backup:
/* When prepending, first copy the existing file to a temporary file. */
if (method == PREPEND) {
FILE *source = fopen(realname, "rb");
FILE *target = NULL;
int verdict;
if (source == NULL) {
statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno));
goto cleanup_and_exit;
}
tempname = safe_tempfile(&target);
if (tempname == NULL) {
statusline(ALERT, _("Error writing temp file: %s"), strerror(errno));
goto cleanup_and_exit;
}
verdict = copy_file(source, target, TRUE);
if (verdict < 0) {
statusline(ALERT, _("Error reading %s: %s"), realname, strerror(errno));
unlink(tempname);
goto cleanup_and_exit;
} else if (verdict > 0) {
statusline(ALERT, _("Error writing temp file: %s"), strerror(errno));
unlink(tempname);
goto cleanup_and_exit;
}
}
if (is_existing_file && S_ISFIFO(st.st_mode))
statusbar(_("Writing to FIFO..."));
#endif /* !NANO_TINY */
/* When it's not a temporary file, this is where we open or create it.
* For an emergency file, access is restricted to just the owner. */
if (thefile == NULL) {
mode_t permissions = (tmp ? S_IRUSR|S_IWUSR : RW_FOR_ALL);
int fd;
#ifndef NANO_TINY
block_sigwinch(TRUE);
install_handler_for_Ctrl_C();
#endif
/* Now open the file. Use O_EXCL for an emergency file. */
fd = open(realname, O_WRONLY | O_CREAT | ((method == APPEND) ?
O_APPEND : (tmp ? O_EXCL : O_TRUNC)), permissions);
#ifndef NANO_TINY
restore_handler_for_Ctrl_C();
block_sigwinch(FALSE);
#endif
/* If we couldn't open the file, give up. */
if (fd == -1) {
if (errno == EINTR || errno == 0)
statusline(ALERT, _("Interrupted"));
else
statusline(ALERT, _("Error writing %s: %s"), realname, strerror(errno));
#ifndef NANO_TINY
if (tempname != NULL)
unlink(tempname);
#endif
goto cleanup_and_exit;
}
thefile = fdopen(fd, (method == APPEND) ? "ab" : "wb");
if (thefile == NULL) {
statusline(ALERT, _("Error writing %s: %s"), realname, strerror(errno));
close(fd);
goto cleanup_and_exit;
}
}
if (!tmp)
statusbar(_("Writing..."));
while (TRUE) {
size_t data_len = strlen(line->data);
size_t wrote;
/* Decode LFs as the NULs that they are, before writing to disk. */
recode_LF_to_NUL(line->data);
wrote = fwrite(line->data, sizeof(char), data_len, thefile);
/* Re-encode any embedded NULs as LFs. */
recode_NUL_to_LF(line->data, data_len);
if (wrote < data_len) {
statusline(ALERT, _("Error writing %s: %s"), realname, strerror(errno));
fclose(thefile);
goto cleanup_and_exit;
}
/* If we've reached the last line of the buffer, don't write a newline
* character after it. If this last line is empty, it means zero bytes
* are written for it, and we don't count it in the number of lines. */
if (line->next == NULL) {
if (line->data[0] != '\0')
lineswritten++;
break;
}
#ifndef NANO_TINY
if (openfile->fmt == DOS_FILE || openfile->fmt == MAC_FILE) {
if (putc('\r', thefile) == EOF) {
statusline(ALERT, _("Error writing %s: %s"), realname, strerror(errno));
fclose(thefile);
goto cleanup_and_exit;
}
}
if (openfile->fmt != MAC_FILE)
#endif
if (putc('\n', thefile) == EOF) {
statusline(ALERT, _("Error writing %s: %s"), realname, strerror(errno));
fclose(thefile);
goto cleanup_and_exit;
}
line = line->next;
lineswritten++;
}
#ifndef NANO_TINY
/* When prepending, append the temporary file to what we wrote above. */
if (method == PREPEND) {
FILE *source = fopen(tempname, "rb");
int verdict;
if (source == NULL) {
statusline(ALERT, _("Error reading temp file: %s"), strerror(errno));
fclose(thefile);
goto cleanup_and_exit;
}
verdict = copy_file(source, thefile, TRUE);
if (verdict < 0) {
statusline(ALERT, _("Error reading temp file: %s"), strerror(errno));
goto cleanup_and_exit;
} else if (verdict > 0) {
statusline(ALERT, _("Error writing %s: %s"), realname, strerror(errno));
goto cleanup_and_exit;
}
unlink(tempname);
} else
#endif
if (fclose(thefile) != 0) {
statusline(ALERT, _("Error writing %s: %s"), realname, strerror(errno));
goto cleanup_and_exit;
}
/* When having written an entire buffer, update some administrivia. */
if (fullbuffer && method == OVERWRITE && !tmp) {
/* If the filename was changed, write a new lockfile when needed,
* and check whether it means a different syntax gets used. */
if (strcmp(openfile->filename, realname) != 0) {
#ifndef NANO_TINY
if (openfile->lock_filename != NULL) {
delete_lockfile(openfile->lock_filename);
free(openfile->lock_filename);
openfile->lock_filename = do_lockfile(realname, FALSE);
}
#endif
openfile->filename = mallocstrcpy(openfile->filename, realname);
#ifdef ENABLE_COLOR
const char *oldname, *newname;
oldname = openfile->syntax ? openfile->syntax->name : "";
find_and_prime_applicable_syntax();
newname = openfile->syntax ? openfile->syntax->name : "";
/* If the syntax changed, discard and recompute the multidata. */
if (strcmp(oldname, newname) != 0) {
for (line = openfile->filetop; line != NULL; line = line->next) {
free(line->multidata);
line->multidata = NULL;
}
precalc_multicolorinfo();
have_palette = FALSE;
refresh_needed = TRUE;
}
#endif
}
#ifndef NANO_TINY
/* Get or update the stat info to reflect the current state. */
stat_with_alloc(realname, &openfile->statinfo);
/* Record at which point in the undo stack the file was saved. */
openfile->last_saved = openfile->current_undo;
openfile->last_action = OTHER;
#endif
openfile->modified = FALSE;
titlebar(NULL);
}
if (!tmp)
statusline(HUSH, P_("Wrote %zu line", "Wrote %zu lines",
lineswritten), lineswritten);
retval = TRUE;
cleanup_and_exit:
#ifndef NANO_TINY
free(backupname);
#endif
free(tempname);
free(realname);
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 *stream, bool tmp,
kind_of_writing_type method)
{
linestruct *birthline, *topline, *botline, *stopper, *afterline;
char *was_datastart, saved_byte;
size_t top_x, bot_x;
bool retval;
get_region(&topline, &top_x, &botline, &bot_x);
/* When needed, prepare a magic end line for the region. */
if (bot_x > 0 && !ISSET(NO_NEWLINES)) {
stopper = make_new_node(botline);
stopper->data = copy_of("");
} else
stopper = NULL;
/* Make the marked area look like a separate buffer. */
afterline = botline->next;
botline->next = stopper;
saved_byte = botline->data[bot_x];
botline->data[bot_x] = '\0';
was_datastart = topline->data;
topline->data += top_x;
birthline = openfile->filetop;
openfile->filetop = topline;
retval = write_file(name, stream, tmp, method, FALSE);
/* Restore the proper state of the buffer. */
openfile->filetop = birthline;
topline->data = was_datastart;
botline->data[bot_x] = saved_byte;
botline->next = afterline;
if (stopper)
delete_node(stopper);
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. Do not ask for a name
* when withprompt is FALSE nor when the SAVE_ON_EXIT flag is set and the
* file already has a name. Return 0 on error, 1 on success, and 2 when
* the buffer is to be discarded. */
int do_writeout(bool exiting, bool withprompt)
{
bool result = FALSE;
kind_of_writing_type method = OVERWRITE;
char *given;
/* The filename we offer, or what the user typed so far. */
bool maychange = (openfile->filename[0] == '\0');
/* Whether it's okay to save the file under a different name. */
#ifdef ENABLE_EXTRA
static bool did_credits = FALSE;
#endif
/* Display newlines in filenames as ^J. */
as_an_at = FALSE;
#ifndef NANO_TINY
given = copy_of((openfile->mark && !exiting) ? "" : openfile->filename);
#else
given = copy_of(openfile->filename);
#endif
while (TRUE) {
const char *msg;
int response = 0, choice = 0;
functionptrtype func;
#ifndef NANO_TINY
const char *formatstr, *backupstr;
formatstr = (openfile->fmt == DOS_FILE) ? _(" [DOS Format]") :
(openfile->fmt == MAC_FILE) ? _(" [Mac Format]") : "";
backupstr = ISSET(MAKE_BACKUP) ? _(" [Backup]") : "";
/* When the mark is on, offer to write the selection to disk, but
* not when in restricted mode, because it would allow writing to
* a file not specified on the command line. */
if (openfile->mark && !exiting && !ISSET(RESTRICTED))
/* TRANSLATORS: The next six strings are prompts. */
msg = (method == PREPEND) ? _("Prepend Selection to File") :
(method == APPEND) ? _("Append Selection to File") :
_("Write Selection to File");
else if (method != OVERWRITE)
msg = (method == PREPEND) ? _("File Name to Prepend to") :
_("File Name to Append to");
else
#endif /* !NANO_TINY */
msg = _("File Name to Write");
present_path = mallocstrcpy(present_path, "./");
/* When we shouldn't prompt, use the existing filename. */
if ((!withprompt || (ISSET(SAVE_ON_EXIT) && exiting)) &&
openfile->filename[0] != '\0')
answer = mallocstrcpy(answer, openfile->filename);
else {
/* Ask for (confirmation of) the filename. Disable tab completion
* when using restricted mode and the filename isn't blank. */
response = do_prompt(!ISSET(RESTRICTED) || openfile->filename[0] == '\0',
TRUE, MWRITEFILE, given, NULL,
edit_refresh, "%s%s%s", msg,
#ifndef NANO_TINY
formatstr, backupstr
#else
"", ""
#endif
);
}
if (response < 0) {
statusbar(_("Cancelled"));
break;
}
func = func_from_key(&response);
/* Upon request, abandon the buffer. */
if (func == discard_buffer) {
free(given);
return 2;
}
given = mallocstrcpy(given, answer);
#ifdef ENABLE_BROWSER
if (func == to_files) {
char *chosen = do_browse_from(answer);
if (chosen == NULL)
continue;
free(answer);
answer = chosen;
} else
#endif
#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(MAKE_BACKUP);
continue;
} else if (func == prepend_void) {
method = (method == PREPEND) ? OVERWRITE : PREPEND;
continue;
} else if (func == append_void) {
method = (method == APPEND) ? OVERWRITE : APPEND;
continue;
}
#endif /* !NANO_TINY */
if (func == do_help) {
continue;
}
#ifdef ENABLE_EXTRA
/* If the user pressed Ctrl-X in the edit window, and answered "Y" at
* the "Save modified buffer?" prompt, and entered "zzy" as filename,
* and this is the first time around, show an Easter egg. */
if (exiting && !ISSET(SAVE_ON_EXIT) && openfile->filename[0] == '\0' &&
strcmp(answer, "zzy") == 0 && !did_credits) {
if (LINES > 5 && COLS > 31) {
do_credits();
did_credits = TRUE;
} else
/* TRANSLATORS: Concisely say the screen is too small. */
statusbar(_("Too tiny"));
break;
}
#endif
if (method == OVERWRITE) {
bool name_exists, do_warning;
char *full_answer, *full_filename;
struct stat st;
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);
free(full_filename);
free(full_answer);
if (do_warning) {
/* When in restricted mode, we aren't allowed to overwrite
* an existing file with the current buffer, nor to change
* the name of the current file if it already has one. */
if (ISSET(RESTRICTED)) {
/* TRANSLATORS: Restricted mode forbids overwriting. */
warn_and_briefly_pause(_("File exists -- "
"cannot overwrite"));
continue;
}
if (!maychange) {
#ifndef NANO_TINY
if (exiting || !openfile->mark)
#endif
{
if (do_yesno_prompt(FALSE, _("Save file under "
"DIFFERENT NAME? ")) < 1)
continue;
maychange = TRUE;
}
}
if (name_exists) {
char *question = _("File \"%s\" exists; OVERWRITE? ");
char *name = display_string(answer, 0,
COLS - breadth(question) + 1, FALSE, FALSE);
char *message = charalloc(strlen(question) +
strlen(name) + 1);
sprintf(message, question, name);
choice = do_yesno_prompt(FALSE, message);
free(message);
free(name);
if (choice < 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->statinfo &&
(openfile->statinfo->st_mtime < st.st_mtime ||
openfile->statinfo->st_dev != st.st_dev ||
openfile->statinfo->st_ino != st.st_ino)) {
warn_and_briefly_pause(_("File on disk has changed"));
choice = do_yesno_prompt(FALSE, _("File was modified "
"since you opened it; continue saving? "));
wipe_statusbar();
/* When in tool mode and not called by 'savefile',
* overwrite the file right here when requested. */
if (ISSET(SAVE_ON_EXIT) && withprompt) {
free(given);
if (choice == 1)
return write_file(openfile->filename, NULL,
FALSE, OVERWRITE, TRUE);
else if (choice == 0)
return 2;
else
return 0;
} else if (choice != 1) {
free(given);
return 1;
}
}
#endif
}
/* 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 (openfile->mark && !exiting && withprompt && !ISSET(RESTRICTED))
result = write_marked_file(answer, NULL, FALSE, method);
else
#endif
result = write_file(answer, NULL, FALSE, method, TRUE);
break;
}
free(given);
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, TRUE) == 2)
close_and_go();
}
/* If it has a name, write the current file to disk without prompting. */
void do_savefile(void)
{
if (do_writeout(FALSE, FALSE) == 2)
close_and_go();
}
/* Convert the tilde notation when the given path begins with ~/ or ~user/.
* Return an allocated string containing the expanded path. */
char *real_dir_from_tilde(const char *path)
{
char *tilded, *retval;
size_t i = 1;
if (*path != '~')
return copy_of(path);
/* Figure out how much of the string we need to compare. */
while (path[i] != '/' && path[i] != '\0')
i++;
if (i == 1) {
get_homedir();
tilded = copy_of(homedir);
} else {
#ifdef HAVE_PWD_H
const struct passwd *userdata;
tilded = measured_copy(path, i);
do {
userdata = getpwent();
} while (userdata && strcmp(userdata->pw_name, tilded + 1) != 0);
endpwent();
if (userdata != NULL)
tilded = mallocstrcpy(tilded, userdata->pw_dir);
#else
tilded = copy_of("");
#endif
}
retval = charalloc(strlen(tilded) + strlen(path + i) + 1);
sprintf(retval, "%s%s", tilded, path + i);
free(tilded);
return retval;
}
#if defined(ENABLE_TABCOMP) || defined(ENABLE_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);
}
#endif
#ifdef ENABLE_TABCOMP
/* Return TRUE when the given path is a directory. */
bool is_dir(const char *path)
{
char *realpath = real_dir_from_tilde(path);
struct stat fileinfo;
bool retval;
retval = (stat(realpath, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode));
free(realpath);
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 Editing, originally
* intended for NetBSD sh (ash)
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Majorly adjusted/re-written for busybox:
* Erik Andersen <andersee@debian.org>
*
* 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;
#ifdef HAVE_PWD_H
const struct passwd *userdata;
#endif
*num_matches = 0;
#ifdef HAVE_PWD_H
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... */
#ifdef ENABLE_OPERATINGDIR
/* ...unless the match exists outside the operating
* directory, in which case just go to the next match. */
if (outside_of_confinement(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();
#endif
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 = copy_of(buf);
char *slash, *filename;
size_t filenamelen;
char **matches = NULL;
DIR *dir;
const struct dirent *nextdir;
*num_matches = 0;
dirname[buf_len] = '\0';
/* If there's a / in the name, split out filename and directory parts. */
slash = strrchr(dirname, '/');
if (slash != NULL) {
char *wasdirname = dirname;
filename = copy_of(++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 = copy_of(present_path);
}
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;
/* 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);
#ifdef ENABLE_OPERATINGDIR
/* ...unless the match exists outside the operating
* directory, in which case just go to the next match. */
skip_match = outside_of_confinement(tmp, 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. */
skip_match = skip_match || (!allow_files && !is_dir(tmp));
free(tmp);
if (skip_match)
continue;
matches = (char **)nrealloc(matches, (*num_matches + 1) *
sizeof(char *));
matches[*num_matches] = copy_of(nextdir->d_name);
++(*num_matches);
}
}
closedir(dir);
free(dirname);
free(filename);
return matches;
}
/* Do tab completion. place refers to how much the status-bar 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;
*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 char1[MAXCHARLEN], char2[MAXCHARLEN];
int len1, len2;
/* Get the number of characters that all matches have in common. */
while (TRUE) {
len1 = collect_char(matches[0] + common_len, char1);
for (match = 1; match < num_matches; match++) {
len2 = collect_char(matches[match] + common_len, char2);
if (len1 != len2 || strncmp(char1, char2, len2) != 0)
break;
}
if (match < num_matches || matches[0][common_len] == '\0')
break;
common_len += len1;
}
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);
if (num_matches == 1 && (is_dir(mzero) || is_dir(glued)))
mzero[common_len++] = '/';
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);
memmove(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) {
size_t longest_name = 0, ncols;
int 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 = breadth(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, 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 /* ENABLE_TABCOMP */