From ab4e94c49e93db47e2615a0e4ed53ad889c8ddd1 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Thu, 3 Apr 2008 05:07:35 +0000
Subject: [PATCH] Merged r939:940 from trunk: Fix PHYSFS_openAppend() on Unix.

---
 CHANGELOG        |  1 +
 platform/posix.c | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/CHANGELOG b/CHANGELOG
index ee4e46e..d3c3eeb 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,7 @@
 
 -- stuff in the stable-1.0 branch, backported from 2.0.0 dev branch, etc ---
 
+04032008 - Fixed PHYSFS_openAppend() to work as documented on Unix.
 03122008 - Removed a FIXME.
 03112008 - Fixed wrong array index in Windows platform layer (thanks, James!).
 03082008 - Fixed compiler warnings in Windows platform layer (thanks, Dennis!).
diff --git a/platform/posix.c b/platform/posix.c
index 5530b9a..eab40a6 100644
--- a/platform/posix.c
+++ b/platform/posix.c
@@ -344,13 +344,26 @@ int __PHYSFS_platformMkDir(const char *path)
 
 static void *doOpen(const char *filename, int mode)
 {
+    const int appending = (mode & O_APPEND);
     int fd;
     int *retval;
     errno = 0;
 
+    /* O_APPEND doesn't actually behave as we'd like. */
+    mode &= ~O_APPEND;
+
     fd = open(filename, mode, S_IRUSR | S_IWUSR);
     BAIL_IF_MACRO(fd < 0, strerror(errno), NULL);
 
+    if (appending)
+    {
+        if (lseek(fd, 0, SEEK_END) < 0)
+        {
+            close(fd);
+            BAIL_MACRO(strerror(errno), NULL);
+        } /* if */
+    } /* if */
+
     retval = (int *) malloc(sizeof (int));
     if (retval == NULL)
     {