| 1 | /* Parse arguments from a string and prepend them to an argv.
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| 2 | Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software; you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 2, or (at your option)
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| 7 | any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program; if not, write to the Free Software
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| 16 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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| 17 | 02110-1301, USA. */
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| 18 |
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| 19 | /* Written by Paul Eggert <eggert@twinsun.com>. */
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| 20 |
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| 21 | #ifdef HAVE_CONFIG_H
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| 22 | # include <config.h>
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| 23 | #endif
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| 24 | #include "prepargs.h"
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| 25 | #include <sys/types.h>
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| 26 | #include <xalloc.h>
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| 27 |
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| 28 | #if HAVE_STRING_H
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| 29 | # include <string.h>
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| 30 | #endif
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| 31 |
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| 32 | #include <ctype.h>
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| 33 |
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| 34 | /* IN_CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
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| 35 | as an argument to <ctype.h> macros like "isspace". */
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| 36 | #ifdef STDC_HEADERS
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| 37 | # define IN_CTYPE_DOMAIN(c) 1
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| 38 | #else
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| 39 | # define IN_CTYPE_DOMAIN(c) ((c) <= 0177)
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| 40 | #endif
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| 41 |
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| 42 | #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
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| 43 |
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| 44 | /* Find the white-space-separated options specified by OPTIONS, and
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| 45 | using BUF to store copies of these options, set ARGV[0], ARGV[1],
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| 46 | etc. to the option copies. Return the number N of options found.
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| 47 | Do not set ARGV[N]. If ARGV is null, do not store ARGV[0]
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| 48 | etc. Backslash can be used to escape whitespace (and backslashes). */
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| 49 | static int
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| 50 | prepend_args (char const *options, char *buf, char **argv)
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| 51 | {
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| 52 | char const *o = options;
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| 53 | char *b = buf;
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| 54 | int n = 0;
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| 55 |
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| 56 | for (;;)
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| 57 | {
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| 58 | while (ISSPACE ((unsigned char) *o))
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| 59 | o++;
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| 60 | if (!*o)
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| 61 | return n;
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| 62 | if (argv)
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| 63 | argv[n] = b;
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| 64 | n++;
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| 65 |
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| 66 | do
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| 67 | if ((*b++ = *o++) == '\\' && *o)
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| 68 | b[-1] = *o++;
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| 69 | while (*o && ! ISSPACE ((unsigned char) *o));
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| 70 |
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| 71 | *b++ = '\0';
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| 72 | }
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| 73 | }
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| 74 |
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| 75 | /* Prepend the whitespace-separated options in OPTIONS to the argument
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| 76 | vector of a main program with argument count *PARGC and argument
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| 77 | vector *PARGV. */
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| 78 | void
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| 79 | prepend_default_options (char const *options, int *pargc, char ***pargv)
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| 80 | {
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| 81 | if (options)
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| 82 | {
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| 83 | char *buf = xmalloc (strlen (options) + 1);
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| 84 | int prepended = prepend_args (options, buf, (char **) 0);
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| 85 | int argc = *pargc;
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| 86 | char * const *argv = *pargv;
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| 87 | char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp);
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| 88 | *pargc = prepended + argc;
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| 89 | *pargv = pp;
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| 90 | *pp++ = *argv++;
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| 91 | pp += prepend_args (options, buf, pp);
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| 92 | while ((*pp++ = *argv++))
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| 93 | continue;
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| 94 | }
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| 95 | }
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