1 /* Parse arguments from a string and prepend them to an argv. 2 3 Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 18 02111-1307, USA. */ 19 20 /* Written by Paul Eggert <eggert@twinsun.com>. */ 21 22 #ifdef HAVE_CONFIG_H 23 # include <config.h> 24 #endif 25 #include "prepargs.h" 26 #include <string.h> 27 #include <sys/types.h> 28 #include <xalloc.h> 29 30 #include <ctype.h> 31 32 /* IN_CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given 33 as an argument to <ctype.h> macros like "isspace". */ 34 #ifdef STDC_HEADERS 35 # define IN_CTYPE_DOMAIN(c) 1 36 #else 37 # define IN_CTYPE_DOMAIN(c) ((c) <= 0177) 38 #endif 39 40 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) 41 42 /* Find the white-space-separated options specified by OPTIONS, and 43 using BUF to store copies of these options, set ARGV[0], ARGV[1], 44 etc. to the option copies. Return the number N of options found. 45 Do not set ARGV[N]. If ARGV is zero, do not store ARGV[0] etc. 46 Backslash can be used to escape whitespace (and backslashes). */ 47 static int 48 prepend_args (char const *options, char *buf, char **argv) 49 { 50 char const *o = options; 51 char *b = buf; 52 int n = 0; 53 54 for (;;) 55 { 56 while (ISSPACE ((unsigned char) *o)) 57 o++; 58 if (!*o) 59 return n; 60 if (argv) 61 argv[n] = b; 62 n++; 63 64 do 65 if ((*b++ = *o++) == '\\' && *o) 66 b[-1] = *o++; 67 while (*o && ! ISSPACE ((unsigned char) *o)); 68 69 *b++ = '\0'; 70 } 71 } 72 73 /* Prepend the whitespace-separated options in OPTIONS to the argument 74 vector of a main program with argument count *PARGC and argument 75 vector *PARGV. */ 76 void 77 prepend_default_options (char const *options, int *pargc, char ***pargv) 78 { 79 if (options) 80 { 81 char *buf = xmalloc (strlen (options) + 1); 82 int prepended = prepend_args (options, buf, (char **) 0); 83 int argc = *pargc; 84 char * const *argv = *pargv; 85 char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp); 86 *pargc = prepended + argc; 87 *pargv = pp; 88 *pp++ = *argv++; 89 pp += prepend_args (options, buf, pp); 90 while ((*pp++ = *argv++)) 91 continue; 92 } 93 } 94