1 /* $NetBSD: prepargs.c,v 1.1.1.1 2016/01/13 03:15:30 christos Exp $ */ 2 3 /* Parse arguments from a string and prepend them to an argv. 4 5 Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2, or (at your option) 10 any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 20 02111-1307, USA. */ 21 22 /* Written by Paul Eggert <eggert@twinsun.com>. */ 23 24 #ifdef HAVE_CONFIG_H 25 # include <config.h> 26 #endif 27 #include "prepargs.h" 28 #include <string.h> 29 #include <sys/types.h> 30 #include <xalloc.h> 31 32 #include <ctype.h> 33 34 /* IN_CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given 35 as an argument to <ctype.h> macros like "isspace". */ 36 #ifdef STDC_HEADERS 37 # define IN_CTYPE_DOMAIN(c) 1 38 #else 39 # define IN_CTYPE_DOMAIN(c) ((c) <= 0177) 40 #endif 41 42 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) 43 44 /* Find the white-space-separated options specified by OPTIONS, and 45 using BUF to store copies of these options, set ARGV[0], ARGV[1], 46 etc. to the option copies. Return the number N of options found. 47 Do not set ARGV[N]. If ARGV is zero, do not store ARGV[0] etc. 48 Backslash can be used to escape whitespace (and backslashes). */ 49 static int 50 prepend_args (char const *options, char *buf, char **argv) 51 { 52 char const *o = options; 53 char *b = buf; 54 int n = 0; 55 56 for (;;) 57 { 58 while (ISSPACE ((unsigned char) *o)) 59 o++; 60 if (!*o) 61 return n; 62 if (argv) 63 argv[n] = b; 64 n++; 65 66 do 67 if ((*b++ = *o++) == '\\' && *o) 68 b[-1] = *o++; 69 while (*o && ! ISSPACE ((unsigned char) *o)); 70 71 *b++ = '\0'; 72 } 73 } 74 75 /* Prepend the whitespace-separated options in OPTIONS to the argument 76 vector of a main program with argument count *PARGC and argument 77 vector *PARGV. */ 78 void 79 prepend_default_options (char const *options, int *pargc, char ***pargv) 80 { 81 if (options) 82 { 83 char *buf = xmalloc (strlen (options) + 1); 84 int prepended = prepend_args (options, buf, (char **) 0); 85 int argc = *pargc; 86 char * const *argv = *pargv; 87 char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp); 88 *pargc = prepended + argc; 89 *pargv = pp; 90 *pp++ = *argv++; 91 pp += prepend_args (options, buf, pp); 92 while ((*pp++ = *argv++)) 93 continue; 94 } 95 } 96