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