/* Parse arguments from a string and prepend them to an argv. Copyright (C) 1999-2002, 2006, 2009-2013 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ /* Written by Paul Eggert . */ #include #include "prepargs.h" #include #include #include #include /* IN_CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given as an argument to macros like "isspace". */ #ifdef STDC_HEADERS # define IN_CTYPE_DOMAIN(c) 1 #else # define IN_CTYPE_DOMAIN(c) ((c) <= 0177) #endif #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) /* Find the white-space-separated options specified by OPTIONS, and using BUF to store copies of these options, set ARGV[0], ARGV[1], etc. to the option copies. Return the number N of options found. Do not set ARGV[N]. If ARGV is zero, do not store ARGV[0] etc. Backslash can be used to escape whitespace (and backslashes). */ static int prepend_args (char const *options, char *buf, char **argv) { char const *o = options; char *b = buf; int n = 0; for (;;) { while (ISSPACE ((unsigned char) *o)) o++; if (!*o) return n; if (argv) argv[n] = b; n++; do if ((*b++ = *o++) == '\\' && *o) b[-1] = *o++; while (*o && ! ISSPACE ((unsigned char) *o)); *b++ = '\0'; } } /* Prepend the whitespace-separated options in OPTIONS to the argument vector of a main program with argument count *PARGC and argument vector *PARGV. */ void prepend_default_options (char const *options, int *pargc, char ***pargv) { if (options) { char *buf = xmalloc (strlen (options) + 1); int prepended = prepend_args (options, buf, (char **) 0); int argc = *pargc; char * const *argv = *pargv; char **pp = xmalloc ((prepended + argc + 1) * sizeof *pp); *pargc = prepended + argc; *pargv = pp; *pp++ = *argv++; pp += prepend_args (options, buf, pp); while ((*pp++ = *argv++)) continue; } }