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Annotation of 43BSDReno/lib/libc/gen/getopt.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1987 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)getopt.c   4.12 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <stdio.h>
                     25: 
                     26: /*
                     27:  * get option letter from argument vector
                     28:  */
                     29: int    opterr = 1,             /* if error message should be printed */
                     30:        optind = 1,             /* index into parent argv vector */
                     31:        optopt;                 /* character checked for validity */
                     32: char   *optarg;                /* argument associated with option */
                     33: 
                     34: #define        BADCH   (int)'?'
                     35: #define        EMSG    ""
                     36: 
                     37: getopt(nargc, nargv, ostr)
                     38:        int nargc;
                     39:        char **nargv, *ostr;
                     40: {
                     41:        static char *place = EMSG;              /* option letter processing */
                     42:        register char *oli;                     /* option letter list index */
                     43:        char *p, *index(), *rindex();
                     44: 
                     45:        if (!*place) {                          /* update scanning pointer */
                     46:                if (optind >= nargc || *(place = nargv[optind]) != '-') {
                     47:                        place = EMSG;
                     48:                        return(EOF);
                     49:                }
                     50:                if (place[1] && *++place == '-') {      /* found "--" */
                     51:                        ++optind;
                     52:                        place = EMSG;
                     53:                        return(EOF);
                     54:                }
                     55:        }                                       /* option letter okay? */
                     56:        if ((optopt = (int)*place++) == (int)':' ||
                     57:            !(oli = index(ostr, optopt))) {
                     58:                /*
                     59:                 * if the user didn't specify '-' as an option,
                     60:                 * assume it means EOF.
                     61:                 */
                     62:                if (optopt == (int)'-')
                     63:                        return(EOF);
                     64:                if (!*place)
                     65:                        ++optind;
                     66:                if (opterr) {
                     67:                        if (!(p = rindex(*nargv, '/')))
                     68:                                p = *nargv;
                     69:                        else
                     70:                                ++p;
                     71:                        (void)fprintf(stderr, "%s: illegal option -- %c\n",
                     72:                            p, optopt);
                     73:                }
                     74:                return(BADCH);
                     75:        }
                     76:        if (*++oli != ':') {                    /* don't need argument */
                     77:                optarg = NULL;
                     78:                if (!*place)
                     79:                        ++optind;
                     80:        }
                     81:        else {                                  /* need an argument */
                     82:                if (*place)                     /* no white space */
                     83:                        optarg = place;
                     84:                else if (nargc <= ++optind) {   /* no arg */
                     85:                        place = EMSG;
                     86:                        if (!(p = rindex(*nargv, '/')))
                     87:                                p = *nargv;
                     88:                        else
                     89:                                ++p;
                     90:                        if (opterr)
                     91:                                (void)fprintf(stderr,
                     92:                                    "%s: option requires an argument -- %c\n",
                     93:                                    p, optopt);
                     94:                        return(BADCH);
                     95:                }
                     96:                else                            /* white space */
                     97:                        optarg = nargv[optind];
                     98:                place = EMSG;
                     99:                ++optind;
                    100:        }
                    101:        return(optopt);                         /* dump back option letter */
                    102: }

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