Stub out most of stdio on AltOS

[fw/pdclib] / platform / altos / functions / stdio / fread.c

diff --git a/platform/altos/functions/stdio/fread.c b/platform/altos/functions/stdio/fread.c
new file mode 100644 (file)
index 0000000..621ed0a
--- /dev/null
+++ b/platform/altos/functions/stdio/fread.c
@@ -0,0 +1,78 @@
+/* $Id$ */
+
+/* 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>
+
+#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 )
+{
+    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 )
+        {
+           int c = getc(stream);
+           if (c == EOF)
+           {
+               /* Could not read requested data */
+               return nmemb_i;
+           }
+           *dest++ = c;
+        }
+    }
+    return nmemb_i;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    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
+