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/* basename - return nondirectory portion of pathname */
/* See Makefile for compilation details. */
/*
Copyright (C) 1999-2020 Free Software Foundation, Inc.
This file is part of GNU Bash.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <stdio.h>
#include "builtins.h"
#include "shell.h"
#include "common.h"
#include "bashgetopt.h"
int
basename_builtin (list)
WORD_LIST *list;
{
int slen, sufflen, off;
char *string, *suffix, *fn;
if (no_options (list))
return (EX_USAGE);
list = loptend;
if (list == 0)
{
builtin_usage ();
return (EX_USAGE);
}
string = list->word->word;
suffix = (char *)NULL;
if (list->next)
{
list = list->next;
suffix = list->word->word;
}
if (list->next)
{
builtin_usage ();
return (EX_USAGE);
}
slen = strlen (string);
/* Strip trailing slashes */
while (slen > 0 && string[slen - 1] == '/')
slen--;
/* (2) If string consists entirely of slash characters, string shall be
set to a single slash character. In this case, skip steps (3)
through (5). */
if (slen == 0)
{
fputs ("/\n", stdout);
return (EXECUTION_SUCCESS);
}
/* (3) If there are any trailing slash characters in string, they
shall be removed. */
string[slen] = '\0';
/* (4) If there are any slash characters remaining in string, the prefix
of string up to an including the last slash character in string
shall be removed. */
while (--slen >= 0)
if (string[slen] == '/')
break;
fn = string + slen + 1;
/* (5) If the suffix operand is present, is not identical to the
characters remaining in string, and is identical to a suffix
of the characters remaining in string, the suffix suffix
shall be removed from string. Otherwise, string shall not be
modified by this step. */
if (suffix)
{
sufflen = strlen (suffix);
slen = strlen (fn);
if (sufflen < slen)
{
off = slen - sufflen;
if (strcmp (fn + off, suffix) == 0)
fn[off] = '\0';
}
}
printf ("%s\n", fn);
return (EXECUTION_SUCCESS);
}
char *basename_doc[] = {
"Return non-directory portion of pathname.",
"",
"The STRING is converted to a filename corresponding to the last",
"pathname component in STRING. If the suffix string SUFFIX is",
"supplied, it is removed.",
(char *)NULL
};
/* The standard structure describing a builtin command. bash keeps an array
of these structures. */
struct builtin basename_struct = {
"basename", /* builtin name */
basename_builtin, /* function implementing the builtin */
BUILTIN_ENABLED, /* initial flags for builtin */
basename_doc, /* array of long documentation strings. */
"basename string [suffix]", /* usage synopsis */
0 /* reserved for internal use */
};
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