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authorUlrich Drepper <drepper@redhat.com>1999-01-17 01:08:32 +0000
committerUlrich Drepper <drepper@redhat.com>1999-01-17 01:08:32 +0000
commit2ac51313f0250b213c0b6ace0cf8cd7a0a904cd8 (patch)
tree47ddbf8090bf77e7b88aeb1e3208145adc2dea41 /stdlib
parent6bfdad38b3e669e5c8b67e99728dc1d97ac1c445 (diff)
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Update.
1999-01-17 Ulrich Drepper <drepper@cygnus.com> * stdlib/canonicalize.c (canonicalize): Update write pointer after realloc. Minor optimizations.
Diffstat (limited to 'stdlib')
-rw-r--r--stdlib/canonicalize.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/stdlib/canonicalize.c b/stdlib/canonicalize.c
index faf4422..889e24d 100644
--- a/stdlib/canonicalize.c
+++ b/stdlib/canonicalize.c
@@ -1,5 +1,5 @@
/* Return the canonical absolute name of a given file.
- Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -92,16 +92,18 @@ canonicalize (const char *name, char *resolved)
int n;
/* Skip sequence of multiple path-separators. */
- while (*start == '/') ++start;
+ while (*start == '/')
+ ++start;
/* Find end of path component. */
- for (end = start; *end && *end != '/'; ++end);
+ for (end = start; *end && *end != '/'; ++end)
+ /* Nothing. */;
if (end - start == 0)
break;
- else if (strncmp (start, ".", end - start) == 0)
+ else if (end - start == 1 && start[0] == '.')
/* nothing */;
- else if (strncmp (start, "..", end - start) == 0)
+ else if (end - start == 2 && start[0] == '.' && start[1] == '.')
{
/* Back up to previous component, ignore if at root already. */
if (dest > rpath + 1)
@@ -116,6 +118,8 @@ canonicalize (const char *name, char *resolved)
if (dest + (end - start) >= rpath_limit)
{
+ ptrdiff_t dest_offset = dest - rpath;
+
if (resolved)
{
__set_errno (ENAMETOOLONG);
@@ -128,8 +132,10 @@ canonicalize (const char *name, char *resolved)
new_size += path_max;
rpath = realloc (rpath, new_size);
rpath_limit = rpath + new_size;
- if (!rpath)
+ if (rpath == NULL)
return NULL;
+
+ dest = rpath + dest_offset;
}
dest = __mempcpy (dest, start, end - start);
@@ -166,8 +172,7 @@ canonicalize (const char *name, char *resolved)
/* Careful here, end may be a pointer into extra_buf... */
memmove (&extra_buf[n], end, len + 1);
- memcpy (extra_buf, buf, n);
- name = end = extra_buf;
+ name = end = memcpy (extra_buf, buf, n);
if (buf[0] == '/')
dest = rpath + 1; /* It's an absolute symlink */
@@ -182,7 +187,7 @@ canonicalize (const char *name, char *resolved)
--dest;
*dest = '\0';
- return resolved ? strcpy (resolved, rpath) : rpath;
+ return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath;
error:
if (resolved)