X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstdio%2Ffgets.c;h=8752892bedc1a26103fe375089a5fff82b4b111b;hp=b7e0faa7bf51f5464e9432a30994d0a8a30e389a;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec

diff --git a/functions/stdio/fgets.c b/functions/stdio/fgets.c
index b7e0faa..8752892 100644
--- a/functions/stdio/fgets.c
+++ b/functions/stdio/fgets.c
@@ -1,8 +1,84 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// 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 */ };
+/* 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
+#include "_PDCLIB_io.h"
+
+char * _PDCLIB_fgets_unlocked( char * _PDCLIB_restrict s, int size, FILE * _PDCLIB_restrict stream )
+{
+    if ( size == 0 )
+    {
+        return NULL;
+    }
+    if ( size == 1 )
+    {
+        *s = '\0';
+        return s;
+    }
+    if ( _PDCLIB_prepread( stream ) == EOF )
+    {
+        return NULL;
+    }
+    char * dest = s;
+
+    dest += _PDCLIB_getchars( dest, size - 1, '\n', stream );
+
+    *dest = '\0';
+    return ( dest == s ) ? NULL : s;
+}
+
+char * fgets( char * _PDCLIB_restrict s, int size, 
+              FILE * _PDCLIB_restrict stream )
+{
+    _PDCLIB_flockfile( stream );
+    char* r = _PDCLIB_fgets_unlocked( s, size, stream );
+    _PDCLIB_funlockfile( stream );
+    return r;
+}
+
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+#include <string.h>
+
+int main( void )
+{
+    FILE * fh;
+    char buffer[10];
+    char const * fgets_test = "foo\nbar\0baz\nweenie";
+    TESTCASE( ( fh = fopen( testfile, "wb+" ) ) != NULL );
+    TESTCASE( fwrite( fgets_test, 1, 18, fh ) == 18 );
+    rewind( fh );
+    TESTCASE( fgets( buffer, 10, fh ) == buffer );
+    TESTCASE( strcmp( buffer, "foo\n" ) == 0 );
+    TESTCASE( fgets( buffer, 10, fh ) == buffer );
+    TESTCASE( memcmp( buffer, "bar\0baz\n", 8 ) == 0 );
+    TESTCASE( fgets( buffer, 10, fh ) == buffer );
+    TESTCASE( strcmp( buffer, "weenie" ) == 0 );
+    TESTCASE( feof( fh ) );
+    TESTCASE( fseek( fh, -1, SEEK_END ) == 0 );
+    TESTCASE( fgets( buffer, 1, fh ) == buffer );
+    TESTCASE( strcmp( buffer, "" ) == 0 );
+    TESTCASE( fgets( buffer, 0, fh ) == NULL );
+    TESTCASE( ! feof( fh ) );
+    TESTCASE( fgets( buffer, 1, fh ) == buffer );
+    TESTCASE( strcmp( buffer, "" ) == 0 );
+    TESTCASE( ! feof( fh ) );
+    TESTCASE( fgets( buffer, 2, fh ) == buffer );
+    TESTCASE( strcmp( buffer, "e" ) == 0 );
+    TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
+    TESTCASE( fgets( buffer, 2, fh ) == NULL );
+    TESTCASE( feof( fh ) );
+    TESTCASE( fclose( fh ) == 0 );
+    TESTCASE( remove( testfile ) == 0 );
+    return TEST_RESULTS;
+}
+
+#endif
+