usr.bin/pr/egetopt.c

   1 /*      $NetBSD: egetopt.c,v 1.9 2011/09/06 18:26:06 joerg Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1991 Keith Muller.
   5  * Copyright (c) 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Keith Muller of the University of California, San Diego.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 from: static char sccsid[] = "@(#)egetopt.c     8.1 (Berkeley) 6/6/93";
  40 #else
  41 __RCSID("$NetBSD: egetopt.c,v 1.9 2011/09/06 18:26:06 joerg Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <ctype.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49
  50 #include "extern.h"
  51
  52 /*
  53  * egetopt:     get option letter from argument vector (an extended
  54  *              version of getopt).
  55  *
  56  * Non standard additions to the ostr specs are:
  57  * 1) '?': immediate value following arg is optional (no white space
  58  *    between the arg and the value)
  59  * 2) '#': +/- followed by a number (with an optional sign but
  60  *    no white space between the arg and the number). The - may be
  61  *    combined with other options, but the + cannot.
  62  */
  63
  64 int     eopterr = 1;            /* if error message should be printed */
  65 int     eoptind = 1;            /* index into parent argv vector */
  66 int     eoptopt;                /* character checked for validity */
  67 char    *eoptarg;               /* argument associated with option */
  68
  69 #define BADCH   (int)'?'
  70 static char EMSG[1] = { '\0' };
  71
  72 int
  73 egetopt(int nargc, char * const *nargv, const char *ostr)
  74 {
  75         static char *place = EMSG;      /* option letter processing */
  76         char *oli;                      /* option letter list index */
  77         static int delim;               /* which option delimiter */
  78         char *p;
  79         static char savec = '\0';
  80
  81         if (savec != '\0') {
  82                 *place = savec;
  83                 savec = '\0';
  84         }
  85
  86         if (!*place) {
  87                 /*
  88                  * update scanning pointer
  89                  */
  90                 if ((eoptind >= nargc) ||
  91                     ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
  92                         place = EMSG;
  93                         return (-1);
  94                 }
  95
  96                 delim = (int)*place;
  97                 if (place[1] && *++place == '-' && !place[1]) {
  98                         /*
  99                          * found "--"
 100                          */
 101                         ++eoptind;
 102                         place = EMSG;
 103                         return (-1);
 104                 }
 105         }
 106
 107         /*
 108          * check option letter
 109          */
 110         if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
 111             !(oli = strchr(ostr, eoptopt))) {
 112                 /*
 113                  * if the user didn't specify '-' as an option,
 114                  * assume it means -1 when by itself.
 115                  */
 116                 if ((eoptopt == (int)'-') && !*place)
 117                         return (-1);
 118                 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
 119                     (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
 120                       isdigit((unsigned char)*place)))) {
 121                         /*
 122                          * # option: +/- with a number is ok
 123                          */
 124                         for (p = place; *p != '\0'; ++p) {
 125                                 if (!isdigit((unsigned char)*p))
 126                                         break;
 127                         }
 128                         eoptarg = place-1;
 129
 130                         if (*p == '\0') {
 131                                 place = EMSG;
 132                                 ++eoptind;
 133                         } else {
 134                                 place = p;
 135                                 savec = *p;
 136                                 *place = '\0';
 137                         }
 138                         return (delim);
 139                 }
 140
 141                 if (!*place)
 142                         ++eoptind;
 143                 if (eopterr) {
 144                         if (!(p = strrchr(*nargv, '/')))
 145                                 p = *nargv;
 146                         else
 147                                 ++p;
 148                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
 149                             p, eoptopt);
 150                 }
 151                 return (BADCH);
 152         }
 153         if (delim == (int)'+') {
 154                 /*
 155                  * '+' is only allowed with numbers
 156                  */
 157                 if (!*place)
 158                         ++eoptind;
 159                 if (eopterr) {
 160                         if (!(p = strrchr(*nargv, '/')))
 161                                 p = *nargv;
 162                         else
 163                                 ++p;
 164                         (void)fprintf(stderr,
 165                                 "%s: illegal '+' delimiter with option -- %c\n",
 166                                 p, eoptopt);
 167                 }
 168                 return (BADCH);
 169         }
 170         ++oli;
 171         if ((*oli != ':') && (*oli != '?')) {
 172                 /*
 173                  * don't need argument
 174                  */
 175                 eoptarg = NULL;
 176                 if (!*place)
 177                         ++eoptind;
 178                 return (eoptopt);
 179         }
 180
 181         if (*place) {
 182                 /*
 183                  * no white space
 184                  */
 185                 eoptarg = place;
 186         } else if (*oli == '?') {
 187                 /*
 188                  * no arg, but NOT required
 189                  */
 190                 eoptarg = NULL;
 191         } else if (nargc <= ++eoptind) {
 192                 /*
 193                  * no arg, but IS required
 194                  */
 195                 place = EMSG;
 196                 if (eopterr) {
 197                         if (!(p = strrchr(*nargv, '/')))
 198                                 p = *nargv;
 199                         else
 200                                 ++p;
 201                         (void)fprintf(stderr,
 202                             "%s: option requires an argument -- %c\n", p,
 203                             eoptopt);
 204                 }
 205                 return (BADCH);
 206         } else {
 207                 /*
 208                  * arg has white space
 209                  */
 210                 eoptarg = nargv[eoptind];
 211         }
 212         place = EMSG;
 213         ++eoptind;
 214         return (eoptopt);
 215 }