79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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/* vi: set sw=4 ts=4: */
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/*
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* simplify_path implementation for busybox
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*
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*
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* Copyright (C) 2001 Vladimir N. Oleynik <dzo@simtreas.ru>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdlib.h>
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#include "libbb.h"
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static inline char *strcpy_overlap(char *dst, const char *src)
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{
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char *ptr = dst;
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do *dst++ = *src; while (*src++);
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return ptr;
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}
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char *simplify_path(const char *path)
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{
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char *s, *start, *next;
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if (path[0] == '/')
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start = xstrdup(path);
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else {
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s = xgetcwd(NULL);
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start = concat_path_file(s, path);
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free(s);
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}
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s = start;
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/* remove . and .. */
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while(*s) {
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if(*s++ == '/' && (*s == '/' || *s == 0)) {
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/* remove duplicate and trailing slashes */
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s = strcpy_overlap(s-1, s);
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}
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else if(*(s-1) == '.' && *(s-2)=='/') {
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if(*s == '/' || *s == 0) {
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/* remove . */
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s = strcpy_overlap(s-1, s); /* maybe set // */
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s--;
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} else if(*s == '.') {
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next = s+1; /* set after ".." */
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if(*next == '/' || *next == 0) { /* "../" */
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if((s-=2) > start)
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/* skip previous dir */
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do s--; while(*s != '/');
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/* remove previous dir */
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strcpy_overlap(s, next);
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}
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}
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}
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}
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if(start[0]==0) {
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start[0]='/';
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start[1]=0;
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}
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return start;
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}
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