2429ad02c3
default options for diff. These options are interpreted first and can be overwritten by explicit command line parameters. * Add the "-o" option to specify old-traditional output style. * Add utility functions for env vars obtained from GNU Grep 2.3h.
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/* prepend_args.c - utilility programs for manpiulating argv[]
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Copyright (C) 1999 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* $FreeBSD$ */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "system.h"
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#include "prepend_args.h"
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/* Find the white-space-separated options specified by OPTIONS, and
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using BUF to store copies of these options, set ARGV[0], ARGV[1],
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etc. to the option copies. Return the number N of options found.
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Do not set ARGV[N] to NULL. If ARGV is NULL, do not store ARGV[0]
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etc. Backslash can be used to escape whitespace (and backslashes). */
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static int
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prepend_args (options, buf, argv)
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char const *options;
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char *buf;
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char **argv;
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{
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char const *o = options;
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char *b = buf;
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int n = 0;
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for (;;)
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{
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while (ISSPACE ((unsigned char) *o))
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o++;
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if (!*o)
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return n;
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if (argv)
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argv[n] = b;
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n++;
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do
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if ((*b++ = *o++) == '\\' && *o)
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b[-1] = *o++;
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while (*o && ! ISSPACE ((unsigned char) *o));
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*b++ = '\0';
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}
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}
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/* Prepend the whitespace-separated options in OPTIONS to the argument
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vector of a main program with argument count *PARGC and argument
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vector *PARGV. */
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void
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prepend_default_options (options, pargc, pargv)
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char const *options;
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int *pargc;
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char ***pargv;
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{
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if (options)
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{
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char *buf = xmalloc (strlen (options) + 1);
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int prepended = prepend_args (options, buf, (char **) NULL);
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int argc = *pargc;
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char * const *argv = *pargv;
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char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp);
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*pargc = prepended + argc;
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*pargv = pp;
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*pp++ = *argv++;
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pp += prepend_args (options, buf, pp);
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while ((*pp++ = *argv++))
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continue;
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}
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}
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