From: Owen Shepherd <owen.shepherd@e43.eu>
Date: Sun, 26 Aug 2012 15:04:22 +0000 (+0100)
Subject: PDCLIB-7: When fseek is called with SEEK_CUR, internally calculate the new offset... 
X-Git-Url: https://pd.if.org/git/?p=pdclib;a=commitdiff_plain;h=852ad49d5888724e4e4f82a6d51d13b0e8029e28

PDCLIB-7: When fseek is called with SEEK_CUR, internally calculate the new offset and then hand SEEK_SET to the glue layer, as our offset may differ from the offset of the underlying file descriptor due to buffering
---

diff --git a/functions/stdio/fseek.c b/functions/stdio/fseek.c
index ab6679b..18c38c3 100644
--- a/functions/stdio/fseek.c
+++ b/functions/stdio/fseek.c
@@ -12,8 +12,9 @@
 
 #include <_PDCLIB_glue.h>
 
-int fseek( struct _PDCLIB_file_t * stream, long offset, int whence )
+int fseek( struct _PDCLIB_file_t * stream, long loffset, int whence )
 {
+    _PDCLIB_int64_t offset = loffset;
     if ( stream->status & _PDCLIB_FWRITE )
     {
         if ( _PDCLIB_flushbuffer( stream ) == EOF )
@@ -26,6 +27,13 @@ int fseek( struct _PDCLIB_file_t * stream, long offset, int whence )
     {
         stream->status &= ~ ( _PDCLIB_FREAD | _PDCLIB_FWRITE );
     }
+
+    if ( whence == SEEK_CUR )
+    {
+        whence  = SEEK_SET;
+        offset += stream->pos.offset;
+    }
+
     return ( _PDCLIB_seek( stream, offset, whence ) != EOF ) ? 0 : EOF;
 }