builtins/bashgetopt.c

   1 /* bashgetopt.c -- `getopt' for use by the builtins. */
   2
   3 /* Copyright (C) 1992-2002 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash 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 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <config.h>
  22
  23 #if defined (HAVE_UNISTD_H)
  24 #  include <unistd.h>
  25 #endif
  26
  27 #include "../bashansi.h"
  28 #include <chartypes.h>
  29 #include <errno.h>
  30
  31 #include "../shell.h"
  32 #include "common.h"
  33
  34 #define ISOPT(s)        (((*(s) == '-') || (plus && *(s) == '+')) && (s)[1])
  35 #define NOTOPT(s)       (((*(s) != '-') && (!plus || *(s) != '+')) || (s)[1] == '\0')
  36
  37 static int      sp;
  38
  39 char    *list_optarg;
  40 int     list_optopt;
  41 int     list_opttype;
  42
  43 static WORD_LIST *lhead = (WORD_LIST *)NULL;
  44 WORD_LIST       *lcurrent = (WORD_LIST *)NULL;
  45 WORD_LIST       *loptend;       /* Points to the first non-option argument in the list */
  46
  47 int
  48 internal_getopt(list, opts)
  49 WORD_LIST       *list;
  50 char            *opts;
  51 {
  52         register int c;
  53         register char *cp;
  54         int     plus;   /* nonzero means to handle +option */
  55         static char errstr[3] = { '-', '\0', '\0' };
  56
  57         plus = *opts == '+';
  58         if (plus)
  59                 opts++;
  60
  61         if (list == 0) {
  62                 list_optarg = (char *)NULL;
  63                 loptend = (WORD_LIST *)NULL;    /* No non-option arguments */
  64                 return -1;
  65         }
  66
  67         if (list != lhead || lhead == 0) {
  68                 /* Hmmm.... called with a different word list.  Reset. */
  69                 sp = 1;
  70                 lcurrent = lhead = list;
  71                 loptend = (WORD_LIST *)NULL;
  72         }
  73
  74         if (sp == 1) {
  75                 if (lcurrent == 0 || NOTOPT(lcurrent->word->word)) {
  76                         lhead = (WORD_LIST *)NULL;
  77                         loptend = lcurrent;
  78                         return(-1);
  79                 } else if (lcurrent->word->word[0] == '-' &&
  80                            lcurrent->word->word[1] == '-' &&
  81                            lcurrent->word->word[2] == 0) {
  82                         lhead = (WORD_LIST *)NULL;
  83                         loptend = lcurrent->next;
  84                         return(-1);
  85                 }
  86                 errstr[0] = list_opttype = lcurrent->word->word[0];
  87         }
  88
  89         list_optopt = c = lcurrent->word->word[sp];
  90
  91         if (c == ':' || (cp = strchr(opts, c)) == NULL) {
  92                 errstr[1] = c;
  93                 sh_invalidopt (errstr);
  94                 if (lcurrent->word->word[++sp] == '\0') {
  95                         lcurrent = lcurrent->next;
  96                         sp = 1;
  97                 }
  98                 list_optarg = NULL;
  99                 if (lcurrent)
 100                         loptend = lcurrent->next;
 101                 return('?');
 102         }
 103
 104         if (*++cp == ':' || *cp == ';') {
 105                 /* `:': Option requires an argument. */
 106                 /* `;': option argument may be missing */
 107                 /* We allow -l2 as equivalent to -l 2 */
 108                 if (lcurrent->word->word[sp+1]) {
 109                         list_optarg = lcurrent->word->word + sp + 1;
 110                         lcurrent = lcurrent->next;
 111                 /* If the specifier is `;', don't set optarg if the next
 112                    argument looks like another option. */
 113 #if 0
 114                 } else if (lcurrent->next && (*cp == ':' || lcurrent->next->word->word[0] != '-')) {
 115 #else
 116                 } else if (lcurrent->next && (*cp == ':' || NOTOPT(lcurrent->next->word->word))) {
 117 #endif
 118                         lcurrent = lcurrent->next;
 119                         list_optarg = lcurrent->word->word;
 120                         lcurrent = lcurrent->next;
 121                 } else if (*cp == ';') {
 122                         list_optarg = (char *)NULL;
 123                         lcurrent = lcurrent->next;
 124                 } else {        /* lcurrent->next == NULL */
 125                         errstr[1] = c;
 126                         sh_needarg (errstr);
 127                         sp = 1;
 128                         list_optarg = (char *)NULL;
 129                         return('?');
 130                 }
 131                 sp = 1;
 132         } else if (*cp == '#') {
 133                 /* option requires a numeric argument */
 134                 if (lcurrent->word->word[sp+1]) {
 135                         if (DIGIT(lcurrent->word->word[sp+1])) {
 136                                 list_optarg = lcurrent->word->word + sp + 1;
 137                                 lcurrent = lcurrent->next;
 138                         } else
 139                                 list_optarg = (char *)NULL;
 140                 } else {
 141                         if (lcurrent->next && legal_number(lcurrent->next->word->word, (intmax_t *)0)) {
 142                                 lcurrent = lcurrent->next;
 143                                 list_optarg = lcurrent->word->word;
 144                                 lcurrent = lcurrent->next;
 145                         } else {
 146                                 errstr[1] = c;
 147                                 sh_neednumarg (errstr);
 148                                 sp = 1;
 149                                 list_optarg = (char *)NULL;
 150                                 return ('?');
 151                         }
 152                 }
 153
 154         } else {
 155                 /* No argument, just return the option. */
 156                 if (lcurrent->word->word[++sp] == '\0') {
 157                         sp = 1;
 158                         lcurrent = lcurrent->next;
 159                 }
 160                 list_optarg = (char *)NULL;
 161         }
 162
 163         return(c);
 164 }
 165
 166 /*
 167  * reset_internal_getopt -- force the in[ft]ernal getopt to reset
 168  */
 169
 170 void
 171 reset_internal_getopt ()
 172 {
 173         lhead = lcurrent = loptend = (WORD_LIST *)NULL;
 174         sp = 1;
 175 }