gets.c

/* gets( char * )

   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"
#include <stdint.h>

char * gets( char * s )
{
    _PDCLIB_flockfile( stdin );
    if ( _PDCLIB_prepread( stdin ) == EOF )
    {
        _PDCLIB_funlockfile( stdin );
        return NULL;
    }
    char * dest = s;
    
    dest += _PDCLIB_getchars( dest, SIZE_MAX, '\n', stdin );
    _PDCLIB_funlockfile( stdin );

    if(*(dest - 1) == '\n') {
        *(--dest) = '\0';
    } else {
        *dest = '\0';
    }

    return ( dest == s ) ? NULL : s;
}

#endif

#ifdef TEST
#include "_PDCLIB_test.h"
#include <string.h>

int main( void )
{
#ifndef REGTEST
    FILE * fh;
    char buffer[10];
    char const * gets_test = "foo\nbar\0baz\nweenie";
    TESTCASE( ( fh = fopen( testfile, "wb" ) ) != NULL );
    TESTCASE( fwrite( gets_test, 1, 18, fh ) == 18 );
    TESTCASE( fclose( fh ) == 0 );
    TESTCASE( ( fh = freopen( testfile, "rb", stdin ) ) != NULL );
    TESTCASE( gets( buffer ) == buffer );
    TESTCASE( strcmp( buffer, "foo" ) == 0 );
    TESTCASE( gets( buffer ) == buffer );
    TESTCASE( memcmp( buffer, "bar\0baz\0", 8 ) == 0 );
    TESTCASE( gets( buffer ) == buffer );
    TESTCASE( strcmp( buffer, "weenie" ) == 0 );
    TESTCASE( feof( fh ) );
    TESTCASE( fseek( fh, -1, SEEK_END ) == 0 );
    TESTCASE( gets( buffer ) == buffer );
    TESTCASE( strcmp( buffer, "e" ) == 0 );
    TESTCASE( feof( fh ) );
    TESTCASE( fseek( fh, 0, SEEK_END ) == 0 );
    TESTCASE( gets( buffer ) == NULL );
    TESTCASE( fclose( fh ) == 0 );
    TESTCASE( remove( testfile ) == 0 );
#endif
    return TEST_RESULTS;
}

#endif