From 84e12bf7ece49073c559dfd58005132a6099a964 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Neal=20Gompa=20=28=E3=83=8B=E3=83=BC=E3=83=AB=E3=83=BB?=
 =?UTF-8?q?=E3=82=B3=E3=82=99=E3=83=B3=E3=83=8F=E3=82=9A=29?=
 <ngompa13@gmail.com>
Date: Mon, 23 Nov 2015 18:19:41 -0500
Subject: [PATCH 2/2] Fixes to internal fopencookie() implementation

Credits to the fixes go to nsz on #musl on Freenode,
who gloriously fixed the implementation such that
the tests all pass.

Upstream-Status: Denied [https://github.com/openSUSE/libsolv/pull/112]
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>

---
 ext/solv_xfopen_fallback_fopencookie.c | 19 ++++++++++---------
 ext/solv_xfopen_fallback_fopencookie.h | 10 +++++-----
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/ext/solv_xfopen_fallback_fopencookie.c b/ext/solv_xfopen_fallback_fopencookie.c
index 0ce2571..89426a9 100644
--- a/ext/solv_xfopen_fallback_fopencookie.c
+++ b/ext/solv_xfopen_fallback_fopencookie.c
@@ -1,10 +1,10 @@
-/* 
+/*
  *	Provides a very limited fopencookie() for environments with a libc
  *	that lacks it.
- *	
- *	Author: zhasha
+ *
+ *	Authors: zhasha & nsz
  *	Modified for libsolv by Neal Gompa
- *	
+ *
  *	This program is licensed under the BSD license, read LICENSE.BSD
  *	for further information.
  *
@@ -33,7 +33,7 @@ static void *proxy(void *arg)
 {
     struct ctx *ctx = arg;
     ssize_t r;
-    size_t n;
+    size_t n, k;
 
     pthread_detach(pthread_self());
 
@@ -47,17 +47,18 @@ static void *proxy(void *arg)
         }
         if (r == 0) { break; }
 
+        n = r, k = 0;
         while (n > 0) {
             r = ctx->io.write ?
-                (ctx->io.write)(ctx->cookie, ctx->buf + ((size_t)r - n), n) :
-                write(ctx->fd, ctx->buf + ((size_t)r - n), n);
+                (ctx->io.write)(ctx->cookie, ctx->buf + k, n) :
+                write(ctx->fd, ctx->buf + k, n);
             if (r < 0) {
                 if (errno != EINTR) { break; }
                 continue;
             }
             if (r == 0) { break; }
 
-            n -= (size_t)r;
+            n -= r, k += r;
         }
         if (n > 0) { break; }
     }
@@ -77,8 +78,8 @@ FILE *fopencookie(void *cookie, const char *mode, struct cookie_io_functions_t i
 
     switch (mode[0]) {
         case 'a':
-        case 'r': rd = 1; break;
         case 'w': wr = 1; break;
+        case 'r': rd = 1; break;
         default:
             errno = EINVAL;
             return NULL;
diff --git a/ext/solv_xfopen_fallback_fopencookie.h b/ext/solv_xfopen_fallback_fopencookie.h
index 6a7bfee..7223e3f 100644
--- a/ext/solv_xfopen_fallback_fopencookie.h
+++ b/ext/solv_xfopen_fallback_fopencookie.h
@@ -1,13 +1,13 @@
-/* 
+/*
  *	Provides a very limited fopencookie() for environments with a libc
  *	that lacks it.
- *	
- *	Author: zhasha
+ *
+ *	Authors: zhasha & nsz
  *	Modified for libsolv by Neal Gompa
- *	
+ *
  *	This program is licensed under the BSD license, read LICENSE.BSD
  *	for further information.
- *	
+ *
  */
 
 #ifndef SOLV_XFOPEN_FALLBACK_FOPENCOOKIE_H
-- 
2.4.0