lib/libiberty/argv.c

   1 /*
   2  * Copyright (c) 2004 Joerg Sonnenberger <joerg@bec.de>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  * $DragonFly: src/lib/libiberty/argv.c,v 1.1 2004/10/23 14:15:21 joerg Exp $
  26  */
  27
  28 #include <assert.h>
  29 #include <libiberty.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #define IS_SEP(x) ((x) == ' ' || (x) == '\t')
  34
  35 /*
  36  * Return the first character of the next word.
  37  * len is the word len after quoting and escaping has been removed.
  38  */
  39 static const char *
  40 find_next_word(const char *arg, size_t *len)
  41 {
  42         enum {NOQUOTE, SQUOTE, DQUOTE} in_quote = NOQUOTE;
  43
  44         *len = 0;
  45
  46         while (*arg != '\0') {
  47                 if (IS_SEP(*arg) && in_quote == NOQUOTE) {
  48                         break;
  49                 } else if (*arg == '\\') {
  50                         arg++;
  51                         if (*arg == '\0')
  52                                 break;
  53                         (*len)++;
  54                 } else if (*arg == '"') {
  55                         if (in_quote == NOQUOTE)
  56                                 in_quote = DQUOTE;
  57                         else if (in_quote == DQUOTE)
  58                                 in_quote = NOQUOTE;
  59                         else
  60                                 (*len)++;
  61                 } else if (*arg == '\'') {
  62                         if (in_quote == NOQUOTE)
  63                                 in_quote = SQUOTE;
  64                         else if (in_quote == SQUOTE)
  65                                 in_quote = NOQUOTE;
  66                         else
  67                                 (*len)++;
  68                 } else {
  69                         (*len)++;
  70                 }
  71                 arg++;
  72         }
  73         return(arg);
  74 }
  75
  76 static char *
  77 copy_word(const char *arg, const char *end, size_t len)
  78 {
  79         char *buf, *buf_begin;
  80         enum {NOQUOTE, SQUOTE, DQUOTE} in_quote = NOQUOTE;
  81
  82         assert(arg < end);
  83
  84         buf_begin = buf = malloc(len + 1);
  85
  86         for (; arg < end; arg++) {
  87                 if (*arg == '\\') {
  88                         arg++;
  89                         if (arg >= end)
  90                                 break;
  91                         *buf++ = *arg;
  92                 } else if (*arg == '"') {
  93                         if (in_quote == NOQUOTE)
  94                                 in_quote = DQUOTE;
  95                         else if (in_quote == DQUOTE)
  96                                 in_quote = NOQUOTE;
  97                         else
  98                                 *buf++ = *arg;
  99                 } else if (*arg == '\'') {
 100                         if (in_quote == NOQUOTE)
 101                                 in_quote = SQUOTE;
 102                         else if (in_quote == SQUOTE)
 103                                 in_quote = NOQUOTE;
 104                         else
 105                                 *buf++ = *arg;
 106                 } else {
 107                         *buf++ = *arg;
 108                 }
 109         }
 110         *buf = '\0';
 111         return(buf_begin);
 112 }
 113
 114 char **
 115 buildargv(const char *arg)
 116 {
 117         void *tmp;
 118         const char *begin_arg;
 119         char **argv;
 120         int args;
 121         size_t len;
 122
 123         if (arg == NULL)
 124                 return(NULL);
 125
 126         args = 0;
 127         argv = malloc(sizeof(char *));
 128         if (argv == NULL)
 129                 return(NULL);
 130         argv[0] = NULL;
 131
 132         while (*arg != '\0') {
 133                 /* Skip leading white space. */
 134                 while (IS_SEP(*arg))
 135                         arg++;
 136                 if (*arg == '\0')
 137                         break;
 138
 139                 begin_arg = arg;
 140                 arg = find_next_word(arg, &len);
 141
 142                 tmp = realloc(argv, (args + 2) * sizeof(char *));
 143                 if (tmp == NULL)
 144                         goto error;
 145                 argv = tmp;
 146
 147                 argv[args] = copy_word(begin_arg, arg, len);
 148                 if (argv[args] == NULL)
 149                         goto error;
 150                 args++;
 151                 argv[args] = NULL;
 152         }
 153
 154         /*
 155          * The argument might be only white space, in that case,
 156          * an empty argument list should be returned.
 157          */
 158         if (args == 0) {
 159                 tmp = realloc(argv, 2 * sizeof(char *));
 160                 if (tmp == NULL)
 161                         goto error;
 162                 argv = tmp;
 163
 164                 argv[0] = strdup("");
 165                 if (argv[0] == NULL)
 166                         goto error;
 167                 argv[1] = NULL;
 168         }
 169         return(argv);
 170 error:
 171         freeargv(argv);
 172         return(NULL);
 173 }
 174
 175 void
 176 freeargv(char **argv)
 177 {
 178         char **orig_argv;
 179
 180         if (argv == NULL)
 181                 return;
 182
 183         for (orig_argv = argv; *argv != NULL; argv++)
 184                 free(*argv);
 185
 186         free(orig_argv);
 187 }
 188
 189 char **
 190 dupargv(char * const *argv)
 191 {
 192         char * const *orig_argv;
 193         char **new_argv, **new_argv2;
 194         size_t len;
 195
 196         orig_argv = argv;
 197         for (len = 0; *argv != NULL; argv++)
 198                 len++;
 199
 200         new_argv = malloc((len+1) * sizeof(char *));
 201
 202         new_argv2 = new_argv;
 203         for (; orig_argv != NULL; orig_argv++, new_argv++) {
 204                 *new_argv = strdup(*orig_argv);
 205                 if (*new_argv == NULL) {
 206                         freeargv(new_argv2);
 207                         return(NULL);
 208                 }
 209         }
 210         *new_argv = NULL;
 211
 212         return(new_argv2);
 213 }