155 lines
3.0 KiB
C
155 lines
3.0 KiB
C
/*
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* argvsplit.c
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* argv_split() routine
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*
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* Copyright (c) 2012, 2017 pkgconf authors (see AUTHORS).
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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#include <libpkgconf/stdinc.h>
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#include <libpkgconf/libpkgconf.h>
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/*
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* !doc
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*
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* libpkgconf `argvsplit` module
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* =============================
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*
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* This is a lowlevel module which provides parsing of strings into argument vectors,
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* similar to what a shell would do.
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*/
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/*
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* !doc
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*
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* .. c:function:: void pkgconf_argv_free(char **argv)
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*
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* Frees an argument vector.
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*
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* :param char** argv: The argument vector to free.
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* :return: nothing
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*/
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void
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pkgconf_argv_free(char **argv)
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{
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free(argv[0]);
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free(argv);
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}
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/*
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* !doc
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*
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* .. c:function:: int pkgconf_argv_split(const char *src, int *argc, char ***argv)
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*
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* Splits a string into an argument vector.
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*
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* :param char* src: The string to split.
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* :param int* argc: A pointer to an integer to store the argument count.
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* :param char*** argv: A pointer to a pointer for an argument vector.
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* :return: 0 on success, -1 on error.
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* :rtype: int
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*/
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int
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pkgconf_argv_split(const char *src, int *argc, char ***argv)
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{
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char *buf = malloc(strlen(src) + 1);
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const char *src_iter;
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char *dst_iter;
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int argc_count = 0;
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int argv_size = 5;
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char quote = 0;
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bool escaped = false;
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src_iter = src;
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dst_iter = buf;
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memset(buf, 0, strlen(src) + 1);
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*argv = calloc(argv_size, sizeof (void *));
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(*argv)[argc_count] = dst_iter;
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while (*src_iter)
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{
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if (escaped)
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{
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/* POSIX: only \CHAR is special inside a double quote if CHAR is {$, `, ", \, newline}. */
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if (quote == '"')
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{
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if (!(*src_iter == '$' || *src_iter == '`' || *src_iter == '"' || *src_iter == '\\'))
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*dst_iter++ = '\\';
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*dst_iter++ = *src_iter;
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}
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else
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{
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*dst_iter++ = *src_iter;
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}
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escaped = false;
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}
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else if (quote)
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{
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if (*src_iter == quote)
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quote = 0;
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else if (*src_iter == '\\' && quote != '\'')
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escaped = true;
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else
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*dst_iter++ = *src_iter;
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}
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else if (isspace((unsigned char)*src_iter))
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{
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if ((*argv)[argc_count] != NULL)
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{
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argc_count++, dst_iter++;
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if (argc_count == argv_size)
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{
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argv_size += 5;
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*argv = realloc(*argv, sizeof(void *) * argv_size);
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}
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(*argv)[argc_count] = dst_iter;
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}
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}
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else switch(*src_iter)
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{
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case '\\':
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escaped = true;
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break;
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case '\"':
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case '\'':
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quote = *src_iter;
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break;
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default:
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*dst_iter++ = *src_iter;
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break;
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}
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src_iter++;
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}
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if (escaped || quote)
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{
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free(*argv);
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free(buf);
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return -1;
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}
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if (strlen((*argv)[argc_count]))
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{
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argc_count++;
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}
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*argc = argc_count;
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return 0;
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}
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