diff options
Diffstat (limited to 'stdlib/canonicalize.c')
| -rw-r--r-- | stdlib/canonicalize.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/stdlib/canonicalize.c b/stdlib/canonicalize.c index faf4422f18..889e24d0c0 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) |