1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/* 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"
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;
}
if ( _PDCLIB_prepread( stream ) == EOF )
{
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;
}
}
}
*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
|
