X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Ffgets.c;h=a3c41e94085eb3f8fa610d57c926dfa8115c36ef;hb=e9a6658165caf38491a04d17a04accec11a3696c;hp=b7e0faa7bf51f5464e9432a30994d0a8a30e389a;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/stdio/fgets.c b/functions/stdio/fgets.c
index b7e0faa..a3c41e9 100644
--- a/functions/stdio/fgets.c
+++ b/functions/stdio/fgets.c
@@ -1,8 +1,60 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-char * fgets( char * restrict s, int n, FILE * restrict stream ) { /* TODO */ };
+/* $Id$ */
+
+/* fgets( char *, 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
+
+#define _PDCLIB_GLUE_H _PDCLIB_GLUE_H
+#include <_PDCLIB_glue.h>
+
+char * fgets( char * _PDCLIB_restrict s, int size, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
+{
+    if ( size <= 1 )
+    {
+        /* TODO: This is the letter of the standard, but is it the right thing to do? */
+        *s = '\0';
+        return s;
+    }
+    if ( _PDCLIB_prepread( stream ) == EOF )
+    {
+        return NULL;
+    }
+    char * dest = s;
+    while ( ( ( *dest = stream->buffer[stream->bufidx++] ) != '\n' ) && --size > 0 )
+    {
+        if ( stream->bufidx == stream->bufend )
+        {
+            if ( _PDCLIB_fillbuffer( stream ) == EOF )
+            {
+                /* EOF adds \0, error leaves target indeterminate, so we can
+                   just add the \0 anyway.
+                */
+                *dest = '\0';
+                return NULL;
+            }
+        }
+        ++dest;
+    }
+    *dest = '\0';
+    return s;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    TESTCASE( NO_TESTDRIVER );
+    return TEST_RESULTS;
+}
+
+#endif
+