108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/* basename - return nondirectory portion of pathname */
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/* See Makefile for compilation details. */
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#include "config.h"
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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basename_builtin (list)
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WORD_LIST *list;
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{
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int slen, sufflen, off;
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char *string, *suffix, *fn;
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if (list == 0)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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if (no_options (list))
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return (EX_USAGE);
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string = list->word->word;
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suffix = (char *)NULL;
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if (list->next)
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{
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list = list->next;
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suffix = list->word->word;
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}
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if (list->next)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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slen = strlen (string);
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/* Strip trailing slashes */
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while (slen > 0 && string[slen - 1] == '/')
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slen--;
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/* (2) If string consists entirely of slash characters, string shall be
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set to a single slash character. In this case, skip steps (3)
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through (5). */
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if (slen == 0)
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{
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fputs ("/\n", stdout);
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return (EXECUTION_SUCCESS);
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}
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/* (3) If there are any trailing slash characters in string, they
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shall be removed. */
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string[slen] = '\0';
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/* (4) If there are any slash characters remaining in string, the prefix
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of string up to an including the last slash character in string
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shall be removed. */
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while (--slen >= 0)
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if (string[slen] == '/')
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break;
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fn = string + slen + 1;
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/* (5) If the suffix operand is present, is not identical to the
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characters remaining in string, and is identical to a suffix
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of the characters remaining in string, the suffix suffix
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shall be removed from string. Otherwise, string shall not be
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modified by this step. */
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if (suffix)
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{
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sufflen = strlen (suffix);
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slen = strlen (fn);
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if (sufflen < slen)
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{
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off = slen - sufflen;
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if (strcmp (fn + off, suffix) == 0)
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fn[off] = '\0';
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}
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}
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printf ("%s\n", fn);
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return (EXECUTION_SUCCESS);
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}
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char *basename_doc[] = {
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"The STRING is converted to a filename corresponding to the last",
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"pathname component in STRING. If the suffix string SUFFIX is",
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"supplied, it is removed.",
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(char *)NULL
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};
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/* The standard structure describing a builtin command. bash keeps an array
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of these structures. */
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struct builtin basename_struct = {
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"basename", /* builtin name */
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basename_builtin, /* function implementing the builtin */
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BUILTIN_ENABLED, /* initial flags for builtin */
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basename_doc, /* array of long documentation strings. */
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"basename string [suffix]", /* usage synopsis */
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0 /* reserved for internal use */
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};
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