1*0b459c2cSDavid du Colombier /* prepend_args.c - utilility programs for manpiulating argv[]
2*0b459c2cSDavid du Colombier Copyright (C) 1999 Free Software Foundation, Inc.
3*0b459c2cSDavid du Colombier
4*0b459c2cSDavid du Colombier This program is free software; you can redistribute it and/or modify
5*0b459c2cSDavid du Colombier it under the terms of the GNU General Public License as published by
6*0b459c2cSDavid du Colombier the Free Software Foundation; either version 2, or (at your option)
7*0b459c2cSDavid du Colombier any later version.
8*0b459c2cSDavid du Colombier
9*0b459c2cSDavid du Colombier This program is distributed in the hope that it will be useful,
10*0b459c2cSDavid du Colombier but WITHOUT ANY WARRANTY; without even the implied warranty of
11*0b459c2cSDavid du Colombier MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12*0b459c2cSDavid du Colombier GNU General Public License for more details.
13*0b459c2cSDavid du Colombier
14*0b459c2cSDavid du Colombier You should have received a copy of the GNU General Public License
15*0b459c2cSDavid du Colombier along with this program; if not, write to the Free Software
16*0b459c2cSDavid du Colombier Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
17*0b459c2cSDavid du Colombier 02111-1307, USA. */
18*0b459c2cSDavid du Colombier
19*0b459c2cSDavid du Colombier /* $FreeBSD: src/contrib/diff/prepend_args.c,v 1.1 1999/11/26 02:51:44 obrien Exp $ */
20*0b459c2cSDavid du Colombier
21*0b459c2cSDavid du Colombier
22*0b459c2cSDavid du Colombier #ifdef HAVE_CONFIG_H
23*0b459c2cSDavid du Colombier # include "config.h"
24*0b459c2cSDavid du Colombier #endif
25*0b459c2cSDavid du Colombier #include "system.h"
26*0b459c2cSDavid du Colombier #include "prepend_args.h"
27*0b459c2cSDavid du Colombier #include "diff.h"
28*0b459c2cSDavid du Colombier
29*0b459c2cSDavid du Colombier
30*0b459c2cSDavid du Colombier /* Find the white-space-separated options specified by OPTIONS, and
31*0b459c2cSDavid du Colombier using BUF to store copies of these options, set ARGV[0], ARGV[1],
32*0b459c2cSDavid du Colombier etc. to the option copies. Return the number N of options found.
33*0b459c2cSDavid du Colombier Do not set ARGV[N] to NULL. If ARGV is NULL, do not store ARGV[0]
34*0b459c2cSDavid du Colombier etc. Backslash can be used to escape whitespace (and backslashes). */
35*0b459c2cSDavid du Colombier static int
prepend_args(options,buf,argv)36*0b459c2cSDavid du Colombier prepend_args (options, buf, argv)
37*0b459c2cSDavid du Colombier char const *options;
38*0b459c2cSDavid du Colombier char *buf;
39*0b459c2cSDavid du Colombier char **argv;
40*0b459c2cSDavid du Colombier {
41*0b459c2cSDavid du Colombier char const *o = options;
42*0b459c2cSDavid du Colombier char *b = buf;
43*0b459c2cSDavid du Colombier int n = 0;
44*0b459c2cSDavid du Colombier
45*0b459c2cSDavid du Colombier for (;;)
46*0b459c2cSDavid du Colombier {
47*0b459c2cSDavid du Colombier while (ISSPACE ((unsigned char) *o))
48*0b459c2cSDavid du Colombier o++;
49*0b459c2cSDavid du Colombier if (!*o)
50*0b459c2cSDavid du Colombier return n;
51*0b459c2cSDavid du Colombier if (argv)
52*0b459c2cSDavid du Colombier argv[n] = b;
53*0b459c2cSDavid du Colombier n++;
54*0b459c2cSDavid du Colombier
55*0b459c2cSDavid du Colombier do
56*0b459c2cSDavid du Colombier if ((*b++ = *o++) == '\\' && *o)
57*0b459c2cSDavid du Colombier b[-1] = *o++;
58*0b459c2cSDavid du Colombier while (*o && ! ISSPACE ((unsigned char) *o));
59*0b459c2cSDavid du Colombier
60*0b459c2cSDavid du Colombier *b++ = '\0';
61*0b459c2cSDavid du Colombier }
62*0b459c2cSDavid du Colombier }
63*0b459c2cSDavid du Colombier
64*0b459c2cSDavid du Colombier /* Prepend the whitespace-separated options in OPTIONS to the argument
65*0b459c2cSDavid du Colombier vector of a main program with argument count *PARGC and argument
66*0b459c2cSDavid du Colombier vector *PARGV. */
67*0b459c2cSDavid du Colombier void
prepend_default_options(options,pargc,pargv)68*0b459c2cSDavid du Colombier prepend_default_options (options, pargc, pargv)
69*0b459c2cSDavid du Colombier char const *options;
70*0b459c2cSDavid du Colombier int *pargc;
71*0b459c2cSDavid du Colombier char ***pargv;
72*0b459c2cSDavid du Colombier {
73*0b459c2cSDavid du Colombier if (options)
74*0b459c2cSDavid du Colombier {
75*0b459c2cSDavid du Colombier char *buf = xmalloc (strlen (options) + 1);
76*0b459c2cSDavid du Colombier int prepended = prepend_args (options, buf, (char **) NULL);
77*0b459c2cSDavid du Colombier int argc = *pargc;
78*0b459c2cSDavid du Colombier char * const *argv = *pargv;
79*0b459c2cSDavid du Colombier char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp);
80*0b459c2cSDavid du Colombier *pargc = prepended + argc;
81*0b459c2cSDavid du Colombier *pargv = pp;
82*0b459c2cSDavid du Colombier *pp++ = *argv++;
83*0b459c2cSDavid du Colombier pp += prepend_args (options, buf, pp);
84*0b459c2cSDavid du Colombier while ((*pp++ = *argv++))
85*0b459c2cSDavid du Colombier continue;
86*0b459c2cSDavid du Colombier }
87*0b459c2cSDavid du Colombier }
88