gno/lib/libc/gen/basename.c

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/*
* These routines were written by Devin Reade for GNO v2.0.4.
*
* $Id: basename.c,v 1.3 1997/09/21 06:04:59 gdr Exp $
*
* This file is formatted for tabs every 8 columns.
*/
#ifdef __ORCAC__
segment "libc_gen__";
#endif
#include <sys/syslimits.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
/*
* basename
*
* returns the filename component of <path>. If <path> contains colons,
* they are assumed to be the directory separators, otherwise any '/' is
* assumed to be a directory separator.
*
* If no directory separators are found, then the full path is returned.
*
* No check is done as to whether the pathname is valid on the any
* given filesystem.
*/
char *
basename (const char *path) {
char delim, *p;
delim = strchr(path,':') ? ':' : '/';
p = strrchr(path,delim);
return p ? p+1 : path;
}
/*
* dirname
*
* Returns a pointer to an internal buffer that contains a string that
* matches the directory component
* of <path>. If <path> contains at least one ':', then it is assumed
* that colons are directory separators, otherwise any '/' character
* is treated as a directory separator.
*
* If <path> contains no pathname separators, then dirname() will
* return an empty (zero-length) string.
*
* No check is done as to whether the pathname is valid on the any
* given filesystem.
*/
char *
dirname (const char *path)
{
char delim, *p;
size_t len;
static char dir[PATH_MAX];
len = strlen(path);
if (len >= PATH_MAX) {
len = PATH_MAX -1;
strncpy(dir,path,len);
dir[len] = '\0';
} else {
strcpy(dir, path);
}
delim = strchr(dir,':') ? ':' : '/';
p = strrchr(dir,delim);
if (p == NULL) {
*dir = '\0';
} else {
*p = '\0';
}
return dir;
}