X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Ffseek.c;h=167c18693800903bc71fb3f315363752ed96c0b5;hb=b1fc26afebd4d557ff89a44bc21767a8704c3809;hp=e3d3e7791836e7e92e25b293a6fe7ec853099fbe;hpb=393020b6e48719d27699dea6b29e53025bbd5123;p=pdclib

diff --git a/functions/stdio/fseek.c b/functions/stdio/fseek.c
index e3d3e77..167c186 100644
--- a/functions/stdio/fseek.c
+++ b/functions/stdio/fseek.c
@@ -1,6 +1,4 @@
-/* $Id$ */
-
-/* fseek( FILE *, long offset, int )
+/* fseek( FILE *, long, int )
 
    This file is part of the Public Domain C Library (PDCLib).
    Permission is granted to use, modify, and / or redistribute at will.
@@ -12,7 +10,7 @@
 
 #include <_PDCLIB_glue.h>
 
-int fseek( struct _PDCLIB_file_t * _PDCLIB_restrict stream, long offset, int whence )
+int fseek( struct _PDCLIB_file_t * stream, long offset, int whence )
 {
     if ( stream->status & _PDCLIB_FWRITE )
     {
@@ -26,17 +24,59 @@ int fseek( struct _PDCLIB_file_t * _PDCLIB_restrict stream, long offset, int whe
     {
         stream->status &= ~ ( _PDCLIB_FREAD | _PDCLIB_FWRITE );
     }
-    return _PDCLIB_seek( stream, offset, whence );
+    return ( _PDCLIB_seek( stream, offset, whence ) != EOF ) ? 0 : EOF;
 }
 
 #endif
 
 #ifdef TEST
 #include <_PDCLIB_test.h>
+#include <string.h>
 
 int main( void )
 {
-    /* Testing covered by ftell.c */
+    FILE * fh;
+    TESTCASE( ( fh = tmpfile() ) != NULL );
+    TESTCASE( fwrite( teststring, 1, strlen( teststring ), fh ) == strlen( teststring ) );
+    /* General functionality */
+    TESTCASE( fseek( fh, -1, SEEK_END ) == 0  );
+    TESTCASE( (size_t)ftell( fh ) == strlen( teststring ) - 1 );
+    TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
+    TESTCASE( (size_t)ftell( fh ) == strlen( teststring ) );
+    TESTCASE( fseek( fh, 0, SEEK_SET ) == 0 );
+    TESTCASE( ftell( fh ) == 0 );
+    TESTCASE( fseek( fh, 5, SEEK_CUR ) == 0 );
+    TESTCASE( ftell( fh ) == 5 );
+    TESTCASE( fseek( fh, -3, SEEK_CUR ) == 0 );
+    TESTCASE( ftell( fh ) == 2 );
+    /* Checking behaviour around EOF */
+    TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
+    TESTCASE( ! feof( fh ) );
+    TESTCASE( fgetc( fh ) == EOF );
+    TESTCASE( feof( fh ) );
+    TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
+    TESTCASE( ! feof( fh ) );
+    /* Checking undo of ungetc() */
+    TESTCASE( fseek( fh, 0, SEEK_SET ) == 0 );
+    TESTCASE( fgetc( fh ) == teststring[0] );
+    TESTCASE( fgetc( fh ) == teststring[1] );
+    TESTCASE( fgetc( fh ) == teststring[2] );
+    TESTCASE( ftell( fh ) == 3 );
+    TESTCASE( ungetc( teststring[2], fh ) == teststring[2] );
+    TESTCASE( ftell( fh ) == 2 );
+    TESTCASE( fgetc( fh ) == teststring[2] );
+    TESTCASE( ftell( fh ) == 3 );
+    TESTCASE( ungetc( 'x', fh ) == 'x' );
+    TESTCASE( ftell( fh ) == 2 );
+    TESTCASE( fgetc( fh ) == 'x' );
+    TESTCASE( ungetc( 'x', fh ) == 'x' );
+    TESTCASE( ftell( fh ) == 2 );
+    TESTCASE( fseek( fh, 2, SEEK_SET ) == 0 );
+    TESTCASE( fgetc( fh ) == teststring[2] );
+    /* Checking error handling */
+    TESTCASE( fseek( fh, -5, SEEK_SET ) == -1 );
+    TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
+    TESTCASE( fclose( fh ) == 0 );
     return TEST_RESULTS;
 }