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Annotation of src/usr.bin/basename/basename.c, Revision 1.6

1.6     ! deraadt     1: /*     $OpenBSD: basename.c,v 1.5 2003/06/03 02:56:06 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.
1.5       millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #ifndef lint
                     34: static char copyright[] =
                     35: "@(#) Copyright (c) 1991, 1993, 1994\n\
                     36:        The Regents of the University of California.  All rights reserved.\n";
                     37: #endif /* not lint */
                     38:
                     39: #ifndef lint
                     40: #if 0
                     41: static char sccsid[] = "@(#)basename.c 8.4 (Berkeley) 5/4/95";
                     42: #endif
1.6     ! deraadt    43: static char rcsid[] = "$OpenBSD: basename.c,v 1.5 2003/06/03 02:56:06 millert Exp $";
1.1       deraadt    44: #endif /* not lint */
                     45:
                     46: #include <stdio.h>
                     47: #include <stdlib.h>
                     48: #include <string.h>
                     49: #include <locale.h>
                     50: #include <unistd.h>
                     51:
1.4       millert    52: void usage(void);
1.1       deraadt    53:
                     54: int
1.6     ! deraadt    55: main(int argc, char *argv[])
1.1       deraadt    56: {
                     57:        char *p;
                     58:
                     59:        setlocale(LC_ALL, "");
                     60:
1.3       millert    61:        if (argc != 2 && argc != 3)
1.1       deraadt    62:                usage();
1.3       millert    63:        argc--;
                     64:        argv++;
1.1       deraadt    65:
                     66:        /*
                     67:         * (1) If string is // it is implementation defined whether steps (2)
                     68:         *     through (5) are skipped or processed.
                     69:         *
                     70:         * (2) If string consists entirely of slash characters, string shall
                     71:         *     be set to a single slash character.  In this case, skip steps
                     72:         *     (3) through (5).
                     73:         */
                     74:        for (p = *argv;; ++p) {
                     75:                if (!*p) {
                     76:                        if (p > *argv)
1.3       millert    77:                                (void)putchar('/');
                     78:                        (void)putchar('\n');
1.1       deraadt    79:                        exit(0);
                     80:                }
                     81:                if (*p != '/')
                     82:                        break;
                     83:        }
                     84:
                     85:        /*
                     86:         * (3) If there are any trailing slash characters in string, they
                     87:         *     shall be removed.
                     88:         */
                     89:        for (; *p; ++p)
                     90:                continue;
                     91:        while (*--p == '/')
                     92:                continue;
                     93:        *++p = '\0';
                     94:
                     95:        /*
                     96:         * (4) If there are any slash characters remaining in string, the
                     97:         *     prefix of string up to an including the last slash character
                     98:         *     in string shall be removed.
                     99:         */
                    100:        while (--p >= *argv)
                    101:                if (*p == '/')
                    102:                        break;
                    103:        ++p;
                    104:
                    105:        /*
                    106:         * (5) If the suffix operand is present, is not identical to the
                    107:         *     characters remaining in string, and is identical to a suffix
                    108:         *     of the characters remaining in string, the suffix suffix
                    109:         *     shall be removed from string.
                    110:         */
                    111:        if (*++argv) {
                    112:                int suffixlen, stringlen, off;
                    113:
                    114:                suffixlen = strlen(*argv);
                    115:                stringlen = strlen(p);
                    116:
                    117:                if (suffixlen < stringlen) {
                    118:                        off = stringlen - suffixlen;
                    119:                        if (!strcmp(p + off, *argv))
                    120:                                p[off] = '\0';
                    121:                }
                    122:        }
1.3       millert   123:        (void)puts(p);
1.1       deraadt   124:        exit(0);
                    125: }
                    126:
                    127: void
1.6     ! deraadt   128: usage(void)
1.1       deraadt   129: {
                    130:
                    131:        (void)fprintf(stderr, "usage: basename string [suffix]\n");
                    132:        exit(1);
                    133: }