libbb: move nuke_str() from passwd into libbb

[oweals/busybox.git] / libbb / simplify_path.c

diff --git a/libbb/simplify_path.c b/libbb/simplify_path.c
index 4641bae88368988aa32f9a45babbd38a408309be..89dc5bdf21c2c3e19295327ec03605456ab3a3fd 100644 (file)
--- a/libbb/simplify_path.c
+++ b/libbb/simplify_path.c
@@ -1,78 +1,59 @@
 /* vi: set sw=4 ts=4: */
 /*
- * simplify_path implementation for busybox
+ * bb_simplify_path implementation for busybox
  *
+ * Copyright (C) 2001  Manuel Novoa III  <mjn3@codepoet.org>
  *
- * 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
-
-#include <stdlib.h>
-
 #include "libbb.h"
 
-static inline char *strcpy_overlap(char *dst, const char *src)
+char* FAST_FUNC bb_simplify_abs_path_inplace(char *start)
 {
-       char *ptr = dst;
+       char *s, *p;
+
+       p = s = start;
+       do {
+               if (*p == '/') {
+                       if (*s == '/') {  /* skip duplicate (or initial) slash */
+                               continue;
+                       }
+                       if (*s == '.') {
+                               if (s[1] == '/' || !s[1]) {  /* remove extra '.' */
+                                       continue;
+                               }
+                               if ((s[1] == '.') && (s[2] == '/' || !s[2])) {
+                                       ++s;
+                                       if (p > start) {
+                                               while (*--p != '/')  /* omit previous dir */
+                                                       continue;
+                                       }
+                                       continue;
+                               }
+                       }
+               }
+               *++p = *s;
+       } while (*++s);
 
-       do *dst++ = *src; while (*src++);
-       return ptr;
+       if ((p == start) || (*p != '/')) {  /* not a trailing slash */
+               ++p;  /* so keep last character */
+       }
+       *p = '\0';
+       return p;
 }
 
-char *simplify_path(const char *path)
+char* FAST_FUNC bb_simplify_path(const char *path)
 {
-       char *s, *start, *next;
+       char *s, *p;
 
        if (path[0] == '/')
-              start = xstrdup(path);
+               s = xstrdup(path);
        else {
-              s = xgetcwd(NULL);
-              start = concat_path_file(s, path);
-              free(s);
+               p = xrealloc_getcwd_or_warn(NULL);
+               s = concat_path_file(p, path);
+               free(p);
        }
-       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;
+       bb_simplify_abs_path_inplace(s);
+       return s;
 }