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Annotation of src/usr.bin/basename/basename.c, Revision 1.4

1.4     ! millert     1: /*     $OpenBSD: basename.c,v 1.3 1997/08/17 21:25:01 millert Exp $    */
1.1       deraadt     2: /*     $NetBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $ */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1991, 1993, 1994
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: static char copyright[] =
                     39: "@(#) Copyright (c) 1991, 1993, 1994\n\
                     40:        The Regents of the University of California.  All rights reserved.\n";
                     41: #endif /* not lint */
                     42:
                     43: #ifndef lint
                     44: #if 0
                     45: static char sccsid[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95";
                     46: #endif
1.4     ! millert    47: static char rcsid[] = "$OpenBSD: basename.c,v 1.3 1997/08/17 21:25:01 millert Exp $";
1.1       deraadt    48: #endif /* not lint */
                     49:
                     50: #include <stdio.h>
                     51: #include <stdlib.h>
                     52: #include <string.h>
                     53: #include <locale.h>
                     54: #include <unistd.h>
                     55:
1.4     ! millert    56: void usage(void);
1.1       deraadt    57:
                     58: int
                     59: main(argc, argv)
                     60:        int argc;
                     61:        char **argv;
                     62: {
                     63:        char *p;
                     64:
                     65:        setlocale(LC_ALL, "");
                     66:
1.3       millert    67:        if (argc != 2 && argc != 3)
1.1       deraadt    68:                usage();
1.3       millert    69:        argc--;
                     70:        argv++;
1.1       deraadt    71:
                     72:        /*
                     73:         * (1) If string is // it is implementation defined whether steps (2)
                     74:         *     through (5) are skipped or processed.
                     75:         *
                     76:         * (2) If string consists entirely of slash characters, string shall
                     77:         *     be set to a single slash character.  In this case, skip steps
                     78:         *     (3) through (5).
                     79:         */
                     80:        for (p = *argv;; ++p) {
                     81:                if (!*p) {
                     82:                        if (p > *argv)
1.3       millert    83:                                (void)putchar('/');
                     84:                        (void)putchar('\n');
1.1       deraadt    85:                        exit(0);
                     86:                }
                     87:                if (*p != '/')
                     88:                        break;
                     89:        }
                     90:
                     91:        /*
                     92:         * (3) If there are any trailing slash characters in string, they
                     93:         *     shall be removed.
                     94:         */
                     95:        for (; *p; ++p)
                     96:                continue;
                     97:        while (*--p == '/')
                     98:                continue;
                     99:        *++p = '\0';
                    100:
                    101:        /*
                    102:         * (4) If there are any slash characters remaining in string, the
                    103:         *     prefix of string up to an including the last slash character
                    104:         *     in string shall be removed.
                    105:         */
                    106:        while (--p >= *argv)
                    107:                if (*p == '/')
                    108:                        break;
                    109:        ++p;
                    110:
                    111:        /*
                    112:         * (5) If the suffix operand is present, is not identical to the
                    113:         *     characters remaining in string, and is identical to a suffix
                    114:         *     of the characters remaining in string, the suffix suffix
                    115:         *     shall be removed from string.
                    116:         */
                    117:        if (*++argv) {
                    118:                int suffixlen, stringlen, off;
                    119:
                    120:                suffixlen = strlen(*argv);
                    121:                stringlen = strlen(p);
                    122:
                    123:                if (suffixlen < stringlen) {
                    124:                        off = stringlen - suffixlen;
                    125:                        if (!strcmp(p + off, *argv))
                    126:                                p[off] = '\0';
                    127:                }
                    128:        }
1.3       millert   129:        (void)puts(p);
1.1       deraadt   130:        exit(0);
                    131: }
                    132:
                    133: void
                    134: usage()
                    135: {
                    136:
                    137:        (void)fprintf(stderr, "usage: basename string [suffix]\n");
                    138:        exit(1);
                    139: }