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  * @(#)egetopt.c        8.1 (Berkeley) 6/6/93
  38  *
  39  * $DragonFly: src/usr.bin/pr/egetopt.c,v 1.3 2003/10/04 20:36:50 hmp Exp $
  40  */
  41
  42 #include <ctype.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46
  47 #include "extern.h"
  48
  49 /*
  50  * egetopt:     get option letter from argument vector (an extended
  51  *              version of getopt).
  52  *
  53  * Non standard additions to the ostr specs are:
  54  * 1) '?': immediate value following arg is optional (no white space
  55  *    between the arg and the value)
  56  * 2) '#': +/- followed by a number (with an optional sign but
  57  *    no white space between the arg and the number). The - may be
  58  *    combined with other options, but the + cannot.
  59  */
  60
  61 int     eopterr = 1;            /* if error message should be printed */
  62 int     eoptind = 1;            /* index into parent argv vector */
  63 int     eoptopt;                /* character checked for validity */
  64 char    *eoptarg;               /* argument associated with option */
  65
  66 #define BADCH   (int)'?'
  67 #define EMSG    ""
  68
  69 int
  70 egetopt(int nargc, char * const *nargv, const char *ostr)
  71 {
  72         static char *place = EMSG;      /* option letter processing */
  73         register char *oli;             /* option letter list index */
  74         static int delim;               /* which option delimeter */
  75         register char *p;
  76         static char savec = '\0';
  77
  78         if (savec != '\0') {
  79                 *place = savec;
  80                 savec = '\0';
  81         }
  82
  83         if (!*place) {
  84                 /*
  85                  * update scanning pointer
  86                  */
  87                 if ((eoptind >= nargc) ||
  88                     ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
  89                         place = EMSG;
  90                         return (EOF);
  91                 }
  92
  93                 delim = (int)*place;
  94                 if (place[1] && *++place == '-' && !place[1]) {
  95                         /*
  96                          * found "--"
  97                          */
  98                         ++eoptind;
  99                         place = EMSG;
 100                         return (EOF);
 101                 }
 102         }
 103
 104         /*
 105          * check option letter
 106          */
 107         if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
 108             !(oli = strchr(ostr, eoptopt))) {
 109                 /*
 110                  * if the user didn't specify '-' as an option,
 111                  * assume it means EOF when by itself.
 112                  */
 113                 if ((eoptopt == (int)'-') && !*place)
 114                         return (EOF);
 115                 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
 116                     (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
 117                       isdigit(*place)))) {
 118                         /*
 119                          * # option: +/- with a number is ok
 120                          */
 121                         for (p = place; *p != '\0'; ++p) {
 122                                 if (!isdigit(*p))
 123                                         break;
 124                         }
 125                         eoptarg = place-1;
 126
 127                         if (*p == '\0') {
 128                                 place = EMSG;
 129                                 ++eoptind;
 130                         } else {
 131                                 place = p;
 132                                 savec = *p;
 133                                 *place = '\0';
 134                         }
 135                         return (delim);
 136                 }
 137
 138                 if (!*place)
 139                         ++eoptind;
 140                 if (eopterr) {
 141                         if (!(p = strrchr(*nargv, '/')))
 142                                 p = *nargv;
 143                         else
 144                                 ++p;
 145                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
 146                             p, eoptopt);
 147                 }
 148                 return (BADCH);
 149         }
 150         if (delim == (int)'+') {
 151                 /*
 152                  * '+' is only allowed with numbers
 153                  */
 154                 if (!*place)
 155                         ++eoptind;
 156                 if (eopterr) {
 157                         if (!(p = strrchr(*nargv, '/')))
 158                                 p = *nargv;
 159                         else
 160                                 ++p;
 161                         (void)fprintf(stderr,
 162                                 "%s: illegal '+' delimiter with option -- %c\n",
 163                                 p, eoptopt);
 164                 }
 165                 return (BADCH);
 166         }
 167         ++oli;
 168         if ((*oli != ':') && (*oli != '?')) {
 169                 /*
 170                  * don't need argument
 171                  */
 172                 eoptarg = NULL;
 173                 if (!*place)
 174                         ++eoptind;
 175                 return (eoptopt);
 176         }
 177
 178         if (*place) {
 179                 /*
 180                  * no white space
 181                  */
 182                 eoptarg = place;
 183         } else if (*oli == '?') {
 184                 /*
 185                  * no arg, but NOT required
 186                  */
 187                 eoptarg = NULL;
 188         } else if (nargc <= ++eoptind) {
 189                 /*
 190                  * no arg, but IS required
 191                  */
 192                 place = EMSG;
 193                 if (eopterr) {
 194                         if (!(p = strrchr(*nargv, '/')))
 195                                 p = *nargv;
 196                         else
 197                                 ++p;
 198                         (void)fprintf(stderr,
 199                             "%s: option requires an argument -- %c\n", p,
 200                             eoptopt);
 201                 }
 202                 return (BADCH);
 203         } else {
 204                 /*
 205                  * arg has white space
 206                  */
 207                 eoptarg = nargv[eoptind];
 208         }
 209         place = EMSG;
 210         ++eoptind;
 211         return (eoptopt);
 212 }