| 1 | /* basename - return nondirectory portion of pathname */
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| 2 |
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| 3 | /* See Makefile for compilation details. */
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| 4 |
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| 5 | #include "config.h"
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| 6 |
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| 7 | #if defined (HAVE_UNISTD_H)
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| 8 | # include <unistd.h>
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| 9 | #endif
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| 10 |
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| 11 | #include <stdio.h>
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| 12 | #include "builtins.h"
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| 13 | #include "shell.h"
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| 14 |
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| 15 | basename_builtin (list)
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| 16 | WORD_LIST *list;
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| 17 | {
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| 18 | int slen, sufflen, off;
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| 19 | char *string, *suffix, *fn;
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| 20 |
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| 21 | if (list == 0)
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| 22 | {
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| 23 | builtin_usage ();
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| 24 | return (EX_USAGE);
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| 25 | }
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| 26 |
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| 27 | if (no_options (list))
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| 28 | return (EX_USAGE);
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| 29 |
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| 30 | string = list->word->word;
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| 31 | suffix = (char *)NULL;
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| 32 | if (list->next)
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| 33 | {
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| 34 | list = list->next;
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| 35 | suffix = list->word->word;
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| 36 | }
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| 37 |
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| 38 | if (list->next)
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| 39 | {
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| 40 | builtin_usage ();
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| 41 | return (EX_USAGE);
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| 42 | }
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| 43 |
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| 44 | slen = strlen (string);
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| 45 |
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| 46 | /* Strip trailing slashes */
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| 47 | while (slen > 0 && string[slen - 1] == '/')
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| 48 | slen--;
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| 49 |
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| 50 | /* (2) If string consists entirely of slash characters, string shall be
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| 51 | set to a single slash character. In this case, skip steps (3)
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| 52 | through (5). */
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| 53 | if (slen == 0)
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| 54 | {
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| 55 | fputs ("/\n", stdout);
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| 56 | return (EXECUTION_SUCCESS);
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| 57 | }
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| 58 |
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| 59 | /* (3) If there are any trailing slash characters in string, they
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| 60 | shall be removed. */
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| 61 | string[slen] = '\0';
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| 62 |
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| 63 | /* (4) If there are any slash characters remaining in string, the prefix
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| 64 | of string up to an including the last slash character in string
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| 65 | shall be removed. */
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| 66 | while (--slen >= 0)
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| 67 | if (string[slen] == '/')
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| 68 | break;
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| 69 |
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| 70 | fn = string + slen + 1;
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| 71 |
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| 72 | /* (5) If the suffix operand is present, is not identical to the
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| 73 | characters remaining in string, and is identical to a suffix
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| 74 | of the characters remaining in string, the suffix suffix
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| 75 | shall be removed from string. Otherwise, string shall not be
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| 76 | modified by this step. */
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| 77 | if (suffix)
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| 78 | {
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| 79 | sufflen = strlen (suffix);
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| 80 | slen = strlen (fn);
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| 81 | if (sufflen < slen)
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| 82 | {
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| 83 | off = slen - sufflen;
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| 84 | if (strcmp (fn + off, suffix) == 0)
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