text_cmds/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: src/usr.bin/pr/egetopt.c,v 1.3 2002/06/23 20:42:30 charnier Exp $");
  46
  47 #include <ctype.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51
  52 #include "extern.h"
  53
  54 /*
  55  * egetopt:     get option letter from argument vector (an extended
  56  *              version of getopt).
  57  *
  58  * Non standard additions to the ostr specs are:
  59  * 1) '?': immediate value following arg is optional (no white space
  60  *    between the arg and the value)
  61  * 2) '#': +/- followed by a number (with an optional sign but
  62  *    no white space between the arg and the number). The - may be
  63  *    combined with other options, but the + cannot.
  64  */
  65
  66 int     eopterr = 1;            /* if error message should be printed */
  67 int     eoptind = 1;            /* index into parent argv vector */
  68 int     eoptopt;                /* character checked for validity */
  69 char    *eoptarg;               /* argument associated with option */
  70
  71 #define BADCH   (int)'?'
  72
  73 static char     emsg[] = "";
  74
  75 int
  76 egetopt(int nargc, char * const *nargv, const char *ostr)
  77 {
  78         static char *place = emsg;      /* option letter processing */
  79         char *oli;                      /* option letter list index */
  80         static int delim;               /* which option delimeter */
  81         char *p;
  82         static char savec = '\0';
  83
  84         if (savec != '\0') {
  85                 *place = savec;
  86                 savec = '\0';
  87         }
  88
  89         if (!*place) {
  90                 /*
  91                  * update scanning pointer
  92                  */
  93                 if ((eoptind >= nargc) ||
  94                     ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
  95                         place = emsg;
  96                         return (-1);
  97                 }
  98
  99                 delim = (int)*place;
 100                 if (place[1] && *++place == '-' && !place[1]) {
 101                         /*
 102                          * found "--"
 103                          */
 104                         ++eoptind;
 105                         place = emsg;
 106                         return (-1);
 107                 }
 108         }
 109
 110         /*
 111          * check option letter
 112          */
 113         if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
 114             !(oli = strchr(ostr, eoptopt))) {
 115                 /*
 116                  * if the user didn't specify '-' as an option,
 117                  * assume it means -1 when by itself.
 118                  */
 119                 if ((eoptopt == (int)'-') && !*place)
 120                         return (-1);
 121                 if (strchr(ostr, '#') && (isdigit(eoptopt) ||
 122                     (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
 123                       isdigit(*place)))) {
 124                         /*
 125                          * # option: +/- with a number is ok
 126                          */
 127                         for (p = place; *p != '\0'; ++p) {
 128                                 if (!isdigit(*p))
 129                                         break;
 130                         }
 131                         eoptarg = place-1;
 132
 133                         if (*p == '\0') {
 134                                 place = emsg;
 135                                 ++eoptind;
 136                         } else {
 137                                 place = p;
 138                                 savec = *p;
 139                                 *place = '\0';
 140                         }
 141                         return (delim);
 142                 }
 143
 144                 if (!*place)
 145                         ++eoptind;
 146                 if (eopterr) {
 147                         if (!(p = strrchr(*nargv, '/')))
 148                                 p = *nargv;
 149                         else
 150                                 ++p;
 151                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
 152                             p, eoptopt);
 153                 }
 154                 return (BADCH);
 155         }
 156         if (delim == (int)'+') {
 157                 /*
 158                  * '+' is only allowed with numbers
 159                  */
 160                 if (!*place)
 161                         ++eoptind;
 162                 if (eopterr) {
 163                         if (!(p = strrchr(*nargv, '/')))
 164                                 p = *nargv;
 165                         else
 166                                 ++p;
 167                         (void)fprintf(stderr,
 168                                 "%s: illegal '+' delimiter with option -- %c\n",
 169                                 p, eoptopt);
 170                 }
 171                 return (BADCH);
 172         }
 173         ++oli;
 174         if ((*oli != ':') && (*oli != '?')) {
 175                 /*
 176                  * don't need argument
 177                  */
 178                 eoptarg = NULL;
 179                 if (!*place)
 180                         ++eoptind;
 181                 return (eoptopt);
 182         }
 183
 184         if (*place) {
 185                 /*
 186                  * no white space
 187                  */
 188                 eoptarg = place;
 189         } else if (*oli == '?') {
 190                 /*
 191                  * no arg, but NOT required
 192                  */
 193                 eoptarg = NULL;
 194         } else if (nargc <= ++eoptind) {
 195                 /*
 196                  * no arg, but IS required
 197                  */
 198                 place = emsg;
 199                 if (eopterr) {
 200                         if (!(p = strrchr(*nargv, '/')))
 201                                 p = *nargv;
 202                         else
 203                                 ++p;
 204                         (void)fprintf(stderr,
 205                             "%s: option requires an argument -- %c\n", p,
 206                             eoptopt);
 207                 }
 208                 return (BADCH);
 209         } else {
 210                 /*
 211                  * arg has white space
 212                  */
 213                 eoptarg = nargv[eoptind];
 214         }
 215         place = emsg;
 216         ++eoptind;
 217         return (eoptopt);
 218 }