Annotation of src/usr.bin/dirname/dirname.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: dirname.c,v 1.6 1995/09/02 06:02:25 jtc Exp $ */
! 2:
! 3: /*-
! 4: * Copyright (c) 1991, 1993, 1994
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by the University of
! 18: * California, Berkeley and its contributors.
! 19: * 4. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: */
! 35:
! 36: #ifndef lint
! 37: static char copyright[] =
! 38: "@(#) Copyright (c) 1991, 1993, 1994\n\
! 39: The Regents of the University of California. All rights reserved.\n";
! 40: #endif /* not lint */
! 41:
! 42: #ifndef lint
! 43: #if 0
! 44: static char sccsid[] = "@(#)dirname.c 8.4 (Berkeley) 5/4/95";
! 45: #endif
! 46: static char rcsid[] = "$NetBSD: dirname.c,v 1.6 1995/09/02 06:02:25 jtc Exp $";
! 47: #endif /* not lint */
! 48:
! 49: #include <stdio.h>
! 50: #include <stdlib.h>
! 51: #include <locale.h>
! 52: #include <unistd.h>
! 53:
! 54: static void usage __P((void));
! 55:
! 56: int
! 57: main(argc, argv)
! 58: int argc;
! 59: char **argv;
! 60: {
! 61: register char *p;
! 62: int ch;
! 63:
! 64: setlocale(LC_ALL, "");
! 65:
! 66: while ((ch = getopt(argc, argv, "")) != -1)
! 67: switch(ch) {
! 68: case '?':
! 69: default:
! 70: usage();
! 71: }
! 72: argc -= optind;
! 73: argv += optind;
! 74:
! 75: if (argc != 1)
! 76: usage();
! 77:
! 78: /*
! 79: * (1) If string is //, skip steps (2) through (5).
! 80: * (2) If string consists entirely of slash characters, string
! 81: * shall be set to a single slash character. In this case,
! 82: * skip steps (3) through (8).
! 83: */
! 84: for (p = *argv;; ++p) {
! 85: if (!*p) {
! 86: if (p > *argv)
! 87: (void)printf("/\n");
! 88: else
! 89: (void)printf(".\n");
! 90: exit(0);
! 91: }
! 92: if (*p != '/')
! 93: break;
! 94: }
! 95:
! 96: /*
! 97: * (3) If there are any trailing slash characters in string, they
! 98: * shall be removed.
! 99: */
! 100: for (; *p; ++p);
! 101: while (*--p == '/')
! 102: continue;
! 103: *++p = '\0';
! 104:
! 105: /*
! 106: * (4) If there are no slash characters remaining in string,
! 107: * string shall be set to a single period character. In this
! 108: * case skip steps (5) through (8).
! 109: *
! 110: * (5) If there are any trailing nonslash characters in string,
! 111: * they shall be removed.
! 112: */
! 113: while (--p >= *argv)
! 114: if (*p == '/')
! 115: break;
! 116: ++p;
! 117: if (p == *argv) {
! 118: (void)printf(".\n");
! 119: exit(0);
! 120: }
! 121:
! 122: /*
! 123: * (6) If the remaining string is //, it is implementation defined
! 124: * whether steps (7) and (8) are skipped or processed.
! 125: *
! 126: * This case has already been handled, as part of steps (1) and (2).
! 127: */
! 128:
! 129: /*
! 130: * (7) If there are any trailing slash characters in string, they
! 131: * shall be removed.
! 132: */
! 133: while (--p >= *argv)
! 134: if (*p != '/')
! 135: break;
! 136: ++p;
! 137:
! 138: /*
! 139: * (8) If the remaining string is empty, string shall be set to
! 140: * a single slash character.
! 141: */
! 142: *p = '\0';
! 143: (void)printf("%s\n", p == *argv ? "/" : *argv);
! 144: exit(0);
! 145: }
! 146:
! 147: static void
! 148: usage()
! 149: {
! 150:
! 151: (void)fprintf(stderr, "usage: dirname path\n");
! 152: exit(1);
! 153: }
! 154:
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