1 files changed, 28 insertions, 39 deletions

diff --git a/libbb/simplify_path.c b/libbb/simplify_path.c
index 4641bae88..cf5b838a1 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;
 }