Yet closer to functional output.

[pdclib] / functions / stdio / fputc.c

diff --git a/functions/stdio/fputc.c b/functions/stdio/fputc.c
index 4321b30a2d9c7b3fec376d474ab9a61f6b767ff3..e9036112297875ab33a8d4ef6dd26503cea30fc1 100644 (file)
--- a/functions/stdio/fputc.c
+++ b/functions/stdio/fputc.c
@@ -1,8 +1,57 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int fputc( int c, FILE * stream ) { /* TODO */ };
+/* $Id$ */
+
+/* fputc( int, 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
+
+/* Write the value c (cast to unsigned char) to the given stream.
+   Returns c if successful, EOF otherwise.
+   If a write error occurs, sets the error indicator of the stream is set.
+*/
+int fputc( int c, struct _PDCLIB_file_t * stream )
+{
+    /* FIXME: This is devoid of any error checking (file writeable? r/w
+    constraints honored?) (Text format translations?)
+    */
+    stream->buffer[stream->bufidx++] = (char)c;
+    if ( ( stream->bufidx == stream->bufsize )                   /* _IOFBF */
+           || ( ( stream->status & _IOLBF ) && ( (char)c == '\n' ) ) /* _IOLBF */
+           || ( stream->status & _IONBF )                        /* _IONBF */
+    )
+    {
+        /* buffer filled, unbuffered stream, or end-of-line. */
+        fflush( stream );
+    }
+    else
+    {
+        stream->status |= _PDCLIB_WROTELAST;
+    }
+    return c;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    FILE * fh;
+    char buffer[100];
+    TESTCASE( ( fh = fopen( "testfile", "w" ) ) != NULL );
+    TESTCASE( fputc( '!', fh ) == '!' );
+    TESTCASE( fclose( fh ) == 0 );
+    TESTCASE( ( fh = fopen( "testfile", "r" ) ) != NULL );
+    TESTCASE( fread( buffer, 1, 1, fh ) == 1 );
+    TESTCASE( buffer[0] == '!' );
+    TESTCASE( fclose( fh ) == 0 );
+    return TEST_RESULTS;
+}
+
+#endif