usr.bin/pr/egetopt.c

   1 /*-
   2  * Copyright (c) 1991 Keith Muller.
   3  * Copyright (c) 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Keith Muller of the University of California, San Diego.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)egetopt.c        8.1 (Berkeley) 6/6/93
  34  *
  35  * $DragonFly: src/usr.bin/pr/egetopt.c,v 1.4 2008/10/16 01:52:32 swildner Exp $
  36  */
  37
  38 #include <ctype.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42
  43 #include "extern.h"
  44
  45 /*
  46  * egetopt:     get option letter from argument vector (an extended
  47  *              version of getopt).
  48  *
  49  * Non standard additions to the ostr specs are:
  50  * 1) '?': immediate value following arg is optional (no white space
  51  *    between the arg and the value)
  52  * 2) '#': +/- followed by a number (with an optional sign but
  53  *    no white space between the arg and the number). The - may be
  54  *    combined with other options, but the + cannot.
  55  */
  56
  57 int     eopterr = 1;            /* if error message should be printed */
  58 int     eoptind = 1;            /* index into parent argv vector */
  59 int     eoptopt;                /* character checked for validity */
  60 char    *eoptarg;               /* argument associated with option */
  61
  62 #define BADCH   (int)'?'
  63 #define EMSG    ""
  64
  65 int
  66 egetopt(int nargc, char * const *nargv, const char *ostr)
  67 {
  68         static char *place = EMSG;      /* option letter processing */
  69         char *oli;                      /* option letter list index */
  70         static int delim;               /* which option delimeter */
  71         char *p;
  72         static char savec = '\0';
  73
  74         if (savec != '\0') {
  75                 *place = savec;
  76                 savec = '\0';
  77         }
  78
  79         if (!*place) {
  80                 /*
  81                  * update scanning pointer
  82                  */
  83                 if ((eoptind >= nargc) ||
  84                     ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
  85                         place = EMSG;
  86                         return (EOF);
  87                 }
  88
  89                 delim = (int)*place;
  90                 if (place[1] && *++place == '-' && !place[1]) {
  91                         /*
  92                          * found "--"
  93                          */
  94                         ++eoptind;
  95                         place = EMSG;
  96                         return (EOF);
  97                 }
  98         }
  99
 100         /*
 101          * check option letter
 102          */
 103         if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
 104             !(oli = strchr(ostr, eoptopt))) {
 105                 /*
 106                  * if the user didn't specify '-' as an option,
 107                  * assume it means EOF when by itself.
 108                  */
 109                 if ((eoptopt == (int)'-') && !*place)
 110                         return (EOF);
 111                 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
 112                     (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
 113                       isdigit(*place)))) {
 114                         /*
 115                          * # option: +/- with a number is ok
 116                          */
 117                         for (p = place; *p != '\0'; ++p) {
 118                                 if (!isdigit(*p))
 119                                         break;
 120                         }
 121                         eoptarg = place-1;
 122
 123                         if (*p == '\0') {
 124                                 place = EMSG;
 125                                 ++eoptind;
 126                         } else {
 127                                 place = p;
 128                                 savec = *p;
 129                                 *place = '\0';
 130                         }
 131                         return (delim);
 132                 }
 133
 134                 if (!*place)
 135                         ++eoptind;
 136                 if (eopterr) {
 137                         if (!(p = strrchr(*nargv, '/')))
 138                                 p = *nargv;
 139                         else
 140                                 ++p;
 141                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
 142                             p, eoptopt);
 143                 }
 144                 return (BADCH);
 145         }
 146         if (delim == (int)'+') {
 147                 /*
 148                  * '+' is only allowed with numbers
 149                  */
 150                 if (!*place)
 151                         ++eoptind;
 152                 if (eopterr) {
 153                         if (!(p = strrchr(*nargv, '/')))
 154                                 p = *nargv;
 155                         else
 156                                 ++p;
 157                         (void)fprintf(stderr,
 158                                 "%s: illegal '+' delimiter with option -- %c\n",
 159                                 p, eoptopt);
 160                 }
 161                 return (BADCH);
 162         }
 163         ++oli;
 164         if ((*oli != ':') && (*oli != '?')) {
 165                 /*
 166                  * don't need argument
 167                  */
 168                 eoptarg = NULL;
 169                 if (!*place)
 170                         ++eoptind;
 171                 return (eoptopt);
 172         }
 173
 174         if (*place) {
 175                 /*
 176                  * no white space
 177                  */
 178                 eoptarg = place;
 179         } else if (*oli == '?') {
 180                 /*
 181                  * no arg, but NOT required
 182                  */
 183                 eoptarg = NULL;
 184         } else if (nargc <= ++eoptind) {
 185                 /*
 186                  * no arg, but IS required
 187                  */
 188                 place = EMSG;
 189                 if (eopterr) {
 190                         if (!(p = strrchr(*nargv, '/')))
 191                                 p = *nargv;
 192                         else
 193                                 ++p;
 194                         (void)fprintf(stderr,
 195                             "%s: option requires an argument -- %c\n", p,
 196                             eoptopt);
 197                 }
 198                 return (BADCH);
 199         } else {
 200                 /*
 201                  * arg has white space
 202                  */
 203                 eoptarg = nargv[eoptind];
 204         }
 205         place = EMSG;
 206         ++eoptind;
 207         return (eoptopt);
 208 }