From 29c4af7f9f8c85ebc9a4335857467436b4883d01 Mon Sep 17 00:00:00 2001
From: Thomas Jarosch <opensource@intra2net.com>
Date: Fri, 23 Jul 2004 13:36:38 +0000
Subject: [PATCH] libftdi: (tomj) Improved error handling (Evgeny Sinelnikov)

---
 ChangeLog   |    4 ++++
 ftdi/ftdi.c |   23 +++++++++++++++--------
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 4e3226d..938acc0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+New in 0.5
+----------
+* Improved error handling (Evgeny Sinelnikov)
+
 New in 0.4
 ----------
 * Fixed filtering of status bytes (Readbuffer size is now 64 bytes)
diff --git a/ftdi/ftdi.c b/ftdi/ftdi.c
index 97b3fcf..6f4c39b 100644
--- a/ftdi/ftdi.c
+++ b/ftdi/ftdi.c
@@ -330,9 +330,12 @@ int ftdi_write_data(struct ftdi_context *ftdi, unsigned char *buf, int size) {
             write_size = size-offset;
 
         ret = usb_bulk_write(ftdi->usb_dev, ftdi->in_ep, buf+offset, write_size, ftdi->usb_write_timeout);
-        if (ret == -1) {
-            ftdi->error_str = "bulk write failed";
-            return -1;
+        if (ret < 0) {
+            if (ret == -1)
+                ftdi->error_str = "bulk write failed";
+            else
+                ftdi->error_str = "usb failed";
+            return ret;
         }
         total_written += ret;
 
@@ -384,9 +387,12 @@ int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size) {
         /* returns how much received */
         ret = usb_bulk_read (ftdi->usb_dev, ftdi->out_ep, ftdi->readbuffer, ftdi->readbuffer_chunksize, ftdi->usb_read_timeout);
 
-        if (ret == -1) {
-            ftdi->error_str = "bulk read failed";
-            return -1;
+        if (ret < 0) {
+            if (ret == -1)
+                ftdi->error_str = "bulk read failed";
+            else
+                ftdi->error_str = "usb failed";
+            return ret;
         }
 
         if (ret > 2) {
@@ -425,16 +431,17 @@ int ftdi_read_data(struct ftdi_context *ftdi, unsigned char *buf, int size) {
         }
     }
     // never reached
-    return -2;
+    return -127;
 }
 
 
 int ftdi_read_data_set_chunksize(struct ftdi_context *ftdi, unsigned int chunksize) {
+    unsigned char *new_buf;
+
     // Invalidate all remaining data
     ftdi->readbuffer_offset = 0;
     ftdi->readbuffer_remaining = 0;
 
-    unsigned char *new_buf;
     if ((new_buf = (unsigned char *)realloc(ftdi->readbuffer, chunksize)) == NULL) {
         ftdi->error_str = "out of memory for readbuffer";
         return -1;
-- 
1.7.1