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. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #if 0
  39 #ifndef lint
  40 static char sccsid[] = "@(#)egetopt.c   8.1 (Berkeley) 6/6/93";
  41 #endif /* not lint */
  42 #endif
  43
  44 #include <sys/cdefs.h>
  45 __FBSDID("$FreeBSD$");
  46
  47 #include <ctype.h>
  48 #include <stdio.h>
  49 #include <string.h>
  50
  51 #include "extern.h"
  52
  53 /*
  54  * egetopt:     get option letter from argument vector (an extended
  55  *              version of getopt).
  56  *
  57  * Non standard additions to the ostr specs are:
  58  * 1) '?': immediate value following arg is optional (no white space
  59  *    between the arg and the value)
  60  * 2) '#': +/- followed by a number (with an optional sign but
  61  *    no white space between the arg and the number). The - may be
  62  *    combined with other options, but the + cannot.
  63  */
  64
  65 int     eopterr = 1;            /* if error message should be printed */
  66 int     eoptind = 1;            /* index into parent argv vector */
  67 int     eoptopt;                /* character checked for validity */
  68 char    *eoptarg;               /* argument associated with option */
  69
  70 #define BADCH   (int)'?'
  71
  72 static char     emsg[] = "";
  73
  74 int
  75 egetopt(int nargc, char * const *nargv, const char *ostr)
  76 {
  77         static char *place = emsg;      /* option letter processing */
  78         char *oli;                      /* option letter list index */
  79         static int delim;               /* which option delimiter */
  80         char *p;
  81         static char savec = '\0';
  82
  83         if (savec != '\0') {
  84                 *place = savec;
  85                 savec = '\0';
  86         }
  87
  88         if (!*place) {
  89                 /*
  90                  * update scanning pointer
  91                  */
  92                 if ((eoptind >= nargc) ||
  93                     ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
  94                         place = emsg;
  95                         return (-1);
  96                 }
  97
  98                 delim = (int)*place;
  99                 if (place[1] && *++place == '-' && !place[1]) {
 100                         /*
 101                          * found "--"
 102                          */
 103                         ++eoptind;
 104                         place = emsg;
 105                         return (-1);
 106                 }
 107         }
 108
 109         /*
 110          * check option letter
 111          */
 112         if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
 113             !(oli = strchr(ostr, eoptopt))) {
 114                 /*
 115                  * if the user didn't specify '-' as an option,
 116                  * assume it means -1 when by itself.
 117                  */
 118                 if ((eoptopt == (int)'-') && !*place)
 119                         return (-1);
 120                 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
 121                     (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
 122                       isdigit(*place)))) {
 123                         /*
 124                          * # option: +/- with a number is ok
 125                          */
 126                         for (p = place; *p != '\0'; ++p) {
 127                                 if (!isdigit(*p))
 128                                         break;
 129                         }
 130                         eoptarg = place-1;
 131
 132                         if (*p == '\0') {
 133                                 place = emsg;
 134                                 ++eoptind;
 135                         } else {
 136                                 place = p;
 137                                 savec = *p;
 138                                 *place = '\0';
 139                         }
 140                         return (delim);
 141                 }
 142
 143                 if (!*place)
 144                         ++eoptind;
 145                 if (eopterr) {
 146                         if (!(p = strrchr(*nargv, '/')))
 147                                 p = *nargv;
 148                         else
 149                                 ++p;
 150                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
 151                             p, eoptopt);
 152                 }
 153                 return (BADCH);
 154         }
 155         if (delim == (int)'+') {
 156                 /*
 157                  * '+' is only allowed with numbers
 158                  */
 159                 if (!*place)
 160                         ++eoptind;
 161                 if (eopterr) {
 162                         if (!(p = strrchr(*nargv, '/')))
 163                                 p = *nargv;
 164                         else
 165                                 ++p;
 166                         (void)fprintf(stderr,
 167                                 "%s: illegal '+' delimiter with option -- %c\n",
 168                                 p, eoptopt);
 169                 }
 170                 return (BADCH);
 171         }
 172         ++oli;
 173         if ((*oli != ':') && (*oli != '?')) {
 174                 /*
 175                  * don't need argument
 176                  */
 177                 eoptarg = NULL;
 178                 if (!*place)
 179                         ++eoptind;
 180                 return (eoptopt);
 181         }
 182
 183         if (*place) {
 184                 /*
 185                  * no white space
 186                  */
 187                 eoptarg = place;
 188         } else if (*oli == '?') {
 189                 /*
 190                  * no arg, but NOT required
 191                  */
 192                 eoptarg = NULL;
 193         } else if (nargc <= ++eoptind) {
 194                 /*
 195                  * no arg, but IS required
 196                  */
 197                 place = emsg;
 198                 if (eopterr) {
 199                         if (!(p = strrchr(*nargv, '/')))
 200                                 p = *nargv;
 201                         else
 202                                 ++p;
 203                         (void)fprintf(stderr,
 204                             "%s: option requires an argument -- %c\n", p,
 205                             eoptopt);
 206                 }
 207                 return (BADCH);
 208         } else {
 209                 /*
 210                  * arg has white space
 211                  */
 212                 eoptarg = nargv[eoptind];
 213         }
 214         place = emsg;
 215         ++eoptind;
 216         return (eoptopt);
 217 }