111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/* basename - return nondirectory portion of pathname */
|
|
|
|
/* See Makefile for compilation details. */
|
|
|
|
#include "config.h"
|
|
|
|
#if defined (HAVE_UNISTD_H)
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include "builtins.h"
|
|
#include "shell.h"
|
|
#include "common.h"
|
|
|
|
basename_builtin (list)
|
|
WORD_LIST *list;
|
|
{
|
|
int slen, sufflen, off;
|
|
char *string, *suffix, *fn;
|
|
|
|
if (list == 0)
|
|
{
|
|
builtin_usage ();
|
|
return (EX_USAGE);
|
|
}
|
|
|
|
if (no_options (list))
|
|
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 */
|
|
};
|