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Diffstat (limited to 'dirname.c')
| -rw-r--r-- | dirname.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/dirname.c b/dirname.c new file mode 100644 index 0000000..77cb664 --- /dev/null +++ b/dirname.c @@ -0,0 +1,146 @@ +/* vi: set sw=4 ts=4: */ +/* + * This is temporary -- needs to be rewritten to be tighter */ +/* + * Copyright (c) 1991, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if 0 +#ifndef lint +static char copyright[] = "@(#) Copyright (c) 1991, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)dirname.c 8.4 (Berkeley) 5/4/95"; +#endif /* not lint */ +#endif /* #if 0 */ + +#include "internal.h" +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +void dirname_usage() +{ + + (void) fprintf(stderr, "usage: dirname path\n"); + exit(1); +} + +extern int dirname_main(argc, argv) +int argc; +char **argv; +{ + char *p; + int ch; + + while ((ch = getopt(argc, argv, "")) != -1) + switch (ch) { + case '?': + default: + dirname_usage(); + } + argc -= optind; + argv += optind; + + if (argc != 1) + dirname_usage(); + + /* + * (1) If string is //, skip steps (2) through (5). + * (2) If string consists entirely of slash characters, string + * shall be set to a single slash character. In this case, + * skip steps (3) through (8). + */ + for (p = *argv;; ++p) { + if (!*p) { + if (p > *argv) + (void) printf("/\n"); + else + (void) printf(".\n"); + exit(0); + } + if (*p != '/') + break; + } + + /* + * (3) If there are any trailing slash characters in string, they + * shall be removed. + */ + for (; *p; ++p); + while (*--p == '/') + continue; + *++p = '\0'; + + /* + * (4) If there are no slash characters remaining in string, + * string shall be set to a single period character. In this + * case skip steps (5) through (8). + * + * (5) If there are any trailing nonslash characters in string, + * they shall be removed. + */ + while (--p >= *argv) + if (*p == '/') + break; + ++p; + if (p == *argv) { + (void) printf(".\n"); + exit(0); + } + + /* + * (6) If the remaining string is //, it is implementation defined + * whether steps (7) and (8) are skipped or processed. + * + * This case has already been handled, as part of steps (1) and (2). + */ + + /* + * (7) If there are any trailing slash characters in string, they + * shall be removed. + */ + while (--p >= *argv) + if (*p != '/') + break; + ++p; + + /* + * (8) If the remaining string is empty, string shall be set to + * a single slash character. + */ + *p = '\0'; + (void) printf("%s\n", p == *argv ? "/" : *argv); + exit(0); +} |