1 /* Parse arguments from a string and prepend them to an argv.
2 Copyright 1999-2001, 2007, 2013 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Paul Eggert <eggert@twinsun.com>. */
23 #include <sys/types.h>
32 /* IN_CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
33 as an argument to <ctype.h> macros like "isspace". */
35 # define IN_CTYPE_DOMAIN(c) 1
37 # define IN_CTYPE_DOMAIN(c) ((c) <= 0177)
40 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
42 /* Find the white-space-separated options specified by OPTIONS, and
43 using BUF to store copies of these options, set ARGV[0], ARGV[1],
44 etc. to the option copies. Return the number N of options found.
45 Do not set ARGV[N]. If ARGV is null, do not store ARGV[0]
46 etc. Backslash can be used to escape whitespace (and backslashes). */
48 prepend_args (char const *options, char *buf, char **argv)
50 char const *o = options;
56 while (ISSPACE ((unsigned char) *o))
65 if ((*b++ = *o++) == '\\' && *o)
67 while (*o && ! ISSPACE ((unsigned char) *o));
73 /* Prepend the whitespace-separated options in OPTIONS to the argument
74 vector of a main program with argument count *PARGC and argument
77 prepend_default_options (char const *options, int *pargc, char ***pargv)
81 char *buf = xmalloc (strlen (options) + 1);
82 int prepended = prepend_args (options, buf, (char **) 0);
84 char * const *argv = *pargv;
85 char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp);
86 *pargc = prepended + argc;
89 pp += prepend_args (options, buf, pp);
90 while ((*pp++ = *argv++))