emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Rewritten by Manuel Novoa III.

Browse Source
This commit is contained in:
Matt Kraai 2001-08-14 17:10:08 +00:00
parent c639a35f50
commit 0a68590314
1 changed files with 28 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
libbb/simplify_path.c
View File

@ -3,7 +3,7 @@
* simplify_path implementation for busybox
*
*
* Copyright (C) 2001 Vladimir N. Oleynik <dzo@simtreas.ru>
* Copyright (C) 2001 Manuel Novoa III <mjn3@opensource.lineo.com>
*
*
* This program is free software; you can redistribute it and/or modify
@ -26,53 +26,42 @@
#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;
char *s, *start, *p;
if (path[0] == '/')
start = xstrdup(path);
start = xstrdup(path);
else {
s = xgetcwd(NULL);
start = concat_path_file(s, path);
free(s);
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);
}
p = s = start;
do {
if (*p == '/') {
if (*s == '/') { /* skip duplicate (or initial) slash */
continue;
} else if (*s == '.') {
if (s[1] == '/' || s[1] == 0) { /* remove extra '.' */
continue;
} else if ((s[1] == '.') && (s[2] == '/' || s[2] == 0)) {
++s;
if (p > start) {
while (*--p != '/'); /* omit previous dir */
}
continue;
}
}
}
*++p = *s;
} while (*++s);
if ((p == start) || (*p != '/')) { /* not a trailing slash */
++p; /* so keep last character */
}
if(start[0]==0) {
start[0]='/';
start[1]=0;
}
*p = 0;
return start;
}