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-rw-r--r--libbb/simplify_path.c67
1 files changed, 28 insertions, 39 deletions
diff --git a/libbb/simplify_path.c b/libbb/simplify_path.c
index 4641bae..cf5b838 100644
--- a/libbb/simplify_path.c
+++ b/libbb/simplify_path.c
@@ -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;
}