1 /* Parse arguments from a string and prepend them to an argv.
3 Copyright (C) 1999-2002, 2006, 2009-2013, 2015-2018 Free Software
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by Paul Eggert <eggert@twinsun.com>. */
25 #include <sys/types.h>
30 /* IN_CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
31 as an argument to <ctype.h> macros like "isspace". */
33 # define IN_CTYPE_DOMAIN(c) 1
35 # define IN_CTYPE_DOMAIN(c) ((c) <= 0177)
38 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
40 /* Find the white-space-separated options specified by OPTIONS, and
41 using BUF to store copies of these options, set ARGV[0], ARGV[1],
42 etc. to the option copies. Return the number N of options found.
43 Do not set ARGV[N]. If ARGV is zero, do not store ARGV[0] etc.
44 Backslash can be used to escape whitespace (and backslashes). */
46 prepend_args (char const *options, char *buf, char **argv)
48 char const *o = options;
54 while (ISSPACE ((unsigned char) *o))
63 if ((*b++ = *o++) == '\\' && *o)
65 while (*o && ! ISSPACE ((unsigned char) *o));
71 /* Prepend the whitespace-separated options in OPTIONS to the argument
72 vector of a main program with argument count *PARGC and argument
75 prepend_default_options (char const *options, int *pargc, char ***pargv)
79 char *buf = xmalloc (strlen (options) + 1);
80 int prepended = prepend_args (options, buf, (char **) 0);
82 char * const *argv = *pargv;
83 char **pp = xmalloc ((prepended + argc + 1) * sizeof *pp);
84 *pargc = prepended + argc;
87 pp += prepend_args (options, buf, pp);
88 while ((*pp++ = *argv++))