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@@ -0,0 +1,91 @@
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+/* Parse arguments from a string and prepend them to an argv.
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+ Copyright 1999, 2000 Free Software Foundation, Inc.
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+
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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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+
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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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+
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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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+
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+/* Written by Paul Eggert <[email protected]>. */
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+
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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 "prepargs.h"
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+#include <sys/types.h>
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+#include <xalloc.h>
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+
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+#include <ctype.h>
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+
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+/* IN_CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
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+ as an argument to <ctype.h> macros like "isspace". */
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+#ifdef STDC_HEADERS
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+# define IN_CTYPE_DOMAIN(c) 1
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+#else
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+# define IN_CTYPE_DOMAIN(c) ((c) <= 0177)
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+#endif
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+
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+#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
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+
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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 (char const *options, char *buf, 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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+
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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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+
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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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+
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+ *b++ = '\0';
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+ }
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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 (char const *options, int *pargc, 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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Paul Eggert