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/* 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/_PDCLIB_glue.h"
#ifndef __STDC_NO_THREADS__
#include <threads.h>
#endif
char * fgets( char * _PDCLIB_restrict s, int size, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
{
char * dest = s;
if ( size == 0 )
{
return NULL;
}
if ( size == 1 )
{
*s = '\0';
return s;
}
_PDCLIB_LOCK( stream->mtx );
if ( _PDCLIB_prepread( stream ) == EOF )
{
_PDCLIB_UNLOCK( stream->mtx );
return NULL;
}
while ( ( ( *dest++ = stream->buffer[stream->bufidx++] ) != '\n' ) && --size > 0 )
{
if ( stream->bufidx == stream->bufend )
{
if ( _PDCLIB_fillbuffer( stream ) == EOF )
{
/* In case of error / EOF before a character is read, this
will lead to a \0 be written anyway. Since the results
are "indeterminate" by definition, this does not hurt.
*/
break;
}
}
}
_PDCLIB_UNLOCK( stream->mtx );
*dest = '\0';
return ( dest == s ) ? NULL : s;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
#include <string.h>
int main( void )
{
FILE * fh;
char buffer[10];
const char * 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
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