Import of OpenSSH 4.3p1

[gssapi-openssh.git] / openssh / openbsd-compat / getcwd.c

diff --git a/openssh/openbsd-compat/getcwd.c b/openssh/openbsd-compat/getcwd.c
index 19be59172ea272f40b63d75613f8332c65c4a4fd..711cb9cd5d47edc575ced9fa8c2086ca7536f019 100644 (file)
--- a/openssh/openbsd-compat/getcwd.c
+++ b/openssh/openbsd-compat/getcwd.c
@@ -1,5 +1,4 @@
-/* OPENBSD ORIGINAL: lib/libc/gen/getcwd.c */
-
+/*     $OpenBSD: getcwd.c,v 1.14 2005/08/08 08:05:34 espie Exp $ */
 /*
  * Copyright (c) 1989, 1991, 1993
  *     The Regents of the University of California.  All rights reserved.
@@ -29,14 +28,12 @@
  * SUCH DAMAGE.
  */
 
+/* OPENBSD ORIGINAL: lib/libc/gen/getcwd.c */
+
 #include "includes.h"
 
 #if !defined(HAVE_GETCWD)
 
-#if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: getcwd.c,v 1.9 2003/06/11 21:03:10 deraadt Exp $";
-#endif /* LIBC_SCCS and not lint */
-
 #include <sys/param.h>
 #include <sys/stat.h>
 #include <errno.h>
@@ -54,12 +51,12 @@ static char rcsid[] = "$OpenBSD: getcwd.c,v 1.9 2003/06/11 21:03:10 deraadt Exp
 char *
 getcwd(char *pt, size_t size)
 {
-       register struct dirent *dp;
-       register DIR *dir = NULL;
-       register dev_t dev;
-       register ino_t ino;
-       register int first;
-       register char *bpt, *bup;
+       struct dirent *dp;
+       DIR *dir = NULL;
+       dev_t dev;
+       ino_t ino;
+       int first;
+       char *bpt, *bup;
        struct stat s;
        dev_t root_dev;
        ino_t root_ino;
@@ -80,7 +77,7 @@ getcwd(char *pt, size_t size)
                }
                ept = pt + size;
        } else {
-               if ((pt = malloc(ptsize = 1024 - 4)) == NULL)
+               if ((pt = malloc(ptsize = MAXPATHLEN)) == NULL)
                        return (NULL);
                ept = pt + ptsize;
        }
@@ -88,13 +85,13 @@ getcwd(char *pt, size_t size)
        *bpt = '\0';
 
        /*
-        * Allocate bytes (1024 - malloc space) for the string of "../"'s.
+        * Allocate bytes for the string of "../"'s.
         * Should always be enough (it's 340 levels).  If it's not, allocate
         * as necessary.  Special * case the first stat, it's ".", not "..".
         */
-       if ((up = malloc(upsize = 1024 - 4)) == NULL)
+       if ((up = malloc(upsize = MAXPATHLEN)) == NULL)
                goto err;
-       eup = up + MAXPATHLEN;
+       eup = up + upsize;
        bup = up;
        up[0] = '.';
        up[1] = '\0';
@@ -139,18 +136,16 @@ getcwd(char *pt, size_t size)
 
                        if ((nup = realloc(up, upsize *= 2)) == NULL)
                                goto err;
+                       bup = nup + (bup - up);
                        up = nup;
-                       bup = up;
                        eup = up + upsize;
                }
                *bup++ = '.';
                *bup++ = '.';
                *bup = '\0';
 
-               /* Open and stat parent directory. 
-                * RACE?? - replaced fstat(dirfd(dir), &s) w/ lstat(up,&s) 
-                 */
-               if (!(dir = opendir(up)) || lstat(up,&s))
+               /* Open and stat parent directory. */
+               if (!(dir = opendir(up)) || fstat(dirfd(dir), &s))
                        goto err;
 
                /* Add trailing slash for next directory. */
@@ -175,7 +170,7 @@ getcwd(char *pt, size_t size)
                                        goto notfound;
                                if (ISDOT(dp))
                                        continue;
-                               memmove(bup, dp->d_name, dp->d_namlen + 1);
+                               memcpy(bup, dp->d_name, dp->d_namlen + 1);
 
                                /* Save the first error for later. */
                                if (lstat(up, &s)) {
@@ -193,19 +188,18 @@ getcwd(char *pt, size_t size)
                 * leading slash.
                 */
                if (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
-                       size_t len, off;
+                       size_t len;
                        char *npt;
 
                        if (!ptsize) {
                                errno = ERANGE;
                                goto err;
                        }
-                       off = bpt - pt;
                        len = ept - bpt;
                        if ((npt = realloc(pt, ptsize *= 2)) == NULL)
                                goto err;
+                       bpt = npt + (bpt - pt);
                        pt = npt;
-                       bpt = pt + off;
                        ept = pt + ptsize;
                        memmove(ept - len, bpt, len);
                        bpt = ept - len;
@@ -213,7 +207,7 @@ getcwd(char *pt, size_t size)
                if (!first)
                        *--bpt = '/';
                bpt -= dp->d_namlen;
-               memmove(bpt, dp->d_name, dp->d_namlen);
+               memcpy(bpt, dp->d_name, dp->d_namlen);
                (void)closedir(dir);
 
                /* Truncate any file name. */
@@ -230,12 +224,16 @@ notfound:
                errno = save_errno ? save_errno : ENOENT;
        /* FALLTHROUGH */
 err:
+       save_errno = errno;
+
        if (ptsize)
                free(pt);
-       if (up)
-               free(up);
+       free(up);
        if (dir)
                (void)closedir(dir);
+
+       errno = save_errno;
+
        return (NULL);
 }