X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Ffread.c;h=87b7acc1e5d0cb8c6db156ca3183c4a5a478e1b5;hb=d6f1494a4f38a212b29a13ee713885058dcf0fe7;hp=83bc3b7e6d0eb2f5dd5e571e393bcdfb46f5a69d;hpb=f603f88b4456cf9b7ab1328bf657ede22a0c9940;p=pdclib

diff --git a/functions/stdio/fread.c b/functions/stdio/fread.c
index 83bc3b7..87b7acc 100644
--- a/functions/stdio/fread.c
+++ b/functions/stdio/fread.c
@@ -1,30 +1,82 @@
-/* $Id$ */
-
-/* fread( void *, size_t, size_t, FILE * )
+/* fwrite( void *, size_t, size_t, FILE * )
 
    This file is part of the Public Domain C Library (PDCLib).
    Permission is granted to use, modify, and / or redistribute at will.
 */
 
 #include <stdio.h>
-#include <_PDCLIB_glue.h>
 
 #ifndef REGTEST
 
+#include "_PDCLIB_glue.h"
+
+#include <stdbool.h>
+#include <string.h>
+
 size_t fread( void * _PDCLIB_restrict ptr, size_t size, size_t nmemb, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
 {
-    return _PDCLIB_read( stream->handle, ptr, size * nmemb );
+    if ( _PDCLIB_prepread( stream ) == EOF )
+    {
+        return 0;
+    }
+    char * dest = (char *)ptr;
+    size_t nmemb_i;
+    for ( nmemb_i = 0; nmemb_i < nmemb; ++nmemb_i )
+    {
+        for ( size_t size_i = 0; size_i < size; ++size_i )
+        {
+            if ( stream->bufidx == stream->bufend )
+            {
+                if ( _PDCLIB_fillbuffer( stream ) == EOF )
+                {
+                    /* Could not read requested data */
+                    return nmemb_i;
+                }
+            }
+            dest[ nmemb_i * size + size_i ] = stream->buffer[ stream->bufidx++ ];
+        }
+    }
+    return nmemb_i;
 }
 
 #endif
 
 #ifdef TEST
-#include <_PDCLIB_test.h>
+#include "_PDCLIB_test.h"
 
 int main( void )
 {
-    /* Testing handled by fwrite(). */
+    FILE * fh;
+    char const * message = "Testing fwrite()...\n";
+    char buffer[21];
+    buffer[20] = 'x';
+    TESTCASE( ( fh = tmpfile() ) != NULL );
+    /* fwrite() / readback */
+    TESTCASE( fwrite( message, 1, 20, fh ) == 20 );
+    rewind( fh );
+    TESTCASE( fread( buffer, 1, 20, fh ) == 20 );
+    TESTCASE( memcmp( buffer, message, 20 ) == 0 );
+    TESTCASE( buffer[20] == 'x' );
+    /* same, different nmemb / size settings */
+    rewind( fh );
+    TESTCASE( memset( buffer, '\0', 20 ) == buffer );
+    TESTCASE( fwrite( message, 5, 4, fh ) == 4 );
+    rewind( fh );
+    TESTCASE( fread( buffer, 5, 4, fh ) == 4 );
+    TESTCASE( memcmp( buffer, message, 20 ) == 0 );
+    TESTCASE( buffer[20] == 'x' );
+    /* same... */
+    rewind( fh );
+    TESTCASE( memset( buffer, '\0', 20 ) == buffer );
+    TESTCASE( fwrite( message, 20, 1, fh ) == 1 );
+    rewind( fh );
+    TESTCASE( fread( buffer, 20, 1, fh ) == 1 );
+    TESTCASE( memcmp( buffer, message, 20 ) == 0 );
+    TESTCASE( buffer[20] == 'x' );
+    /* Done. */
+    TESTCASE( fclose( fh ) == 0 );
     return TEST_RESULTS;
 }
 
 #endif
+