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/* vi: set sw=4 ts=4: */
/*
* simplify_path implementation for busybox
*
*
* Copyright (C) 2001 Vladimir N. Oleynik <dzo@simtreas.ru>
*
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdlib.h>
#include "libbb.h"
static inline char *strcpy_overlap(char *dst, const char *src)
{
char *ptr = dst;
do *dst++ = *src; while (*src++);
return ptr;
}
char *simplify_path(const char *path)
{
char *s, *start, *next;
if (path[0] == '/')
start = xstrdup(path);
else {
s = xgetcwd(NULL);
start = concat_path_file(s, path);
free(s);
}
s = start;
/* remove . and .. */
while(*s) {
if(*s++ == '/' && (*s == '/' || *s == 0)) {
/* remove duplicate and trailing slashes */
s = strcpy_overlap(s-1, s);
}
else if(*(s-1) == '.' && *(s-2)=='/') {
if(*s == '/' || *s == 0) {
/* remove . */
s = strcpy_overlap(s-1, s); /* maybe set // */
s--;
} else if(*s == '.') {
next = s+1; /* set after ".." */
if(*next == '/' || *next == 0) { /* "../" */
if((s-=2) > start)
/* skip previous dir */
do s--; while(*s != '/');
/* remove previous dir */
strcpy_overlap(s, next);
}
}
}
}
if(start[0]==0) {
start[0]='/';
start[1]=0;
}
return start;
}
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