1 /* fwrite( const void *, size_t, size_t, FILE * )
2
3 This file is part of the Public Domain C Library (PDCLib).
4 Permission is granted to use, modify, and / or redistribute at will.
5 */
6
7 #include <stdio.h>
8 #include <string.h>
9
10 #ifndef REGTEST
11
12 #include "pdclib/_PDCLIB_glue.h"
13
14 #ifndef __STDC_NO_THREADS__
15 #include <threads.h>
16 #endif
17
fwrite(const void * _PDCLIB_restrict ptr,size_t size,size_t nmemb,struct _PDCLIB_file_t * _PDCLIB_restrict stream)18 size_t fwrite( const void * _PDCLIB_restrict ptr, size_t size, size_t nmemb, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
19 {
20 _PDCLIB_size_t offset = 0;
21 /* TODO: lineend */
22 /* int lineend = 0; */
23 size_t nmemb_i;
24
25 _PDCLIB_LOCK( stream->mtx );
26
27 if ( _PDCLIB_prepwrite( stream ) == EOF )
28 {
29 _PDCLIB_UNLOCK( stream->mtx );
30 return 0;
31 }
32
33 for ( nmemb_i = 0; nmemb_i < nmemb; ++nmemb_i )
34 {
35 size_t size_i;
36
37 for ( size_i = 0; size_i < size; ++size_i )
38 {
39 if ( ( stream->buffer[ stream->bufidx++ ] = ( ( char * )ptr )[ nmemb_i * size + size_i ] ) == '\n' )
40 {
41 /* Remember last newline, in case we have to do a partial line-buffered flush */
42 offset = stream->bufidx;
43 /* lineend = true; */
44 }
45
46 if ( stream->bufidx == stream->bufsize )
47 {
48 if ( _PDCLIB_flushbuffer( stream ) == EOF )
49 {
50 /* Returning number of objects completely buffered */
51 _PDCLIB_UNLOCK( stream->mtx );
52 return nmemb_i;
53 }
54
55 offset = 0;
56 /* lineend = false; */
57 }
58 }
59 }
60
61 /* Fully-buffered streams are OK. Non-buffered streams must be flushed,
62 line-buffered streams only if there's a newline in the buffer.
63 */
64 switch ( stream->status & ( _IONBF | _IOLBF ) )
65 {
66 case _IONBF:
67 if ( _PDCLIB_flushbuffer( stream ) == EOF )
68 {
69 /* We are in a pinch here. We have an error, which requires a
70 return value < nmemb. On the other hand, all objects have
71 been written to buffer, which means all the caller had to
72 do was removing the error cause, and re-flush the stream...
73 Catch 22. We'll return a value one short, to indicate the
74 error, and can't really do anything about the inconsistency.
75 */
76 _PDCLIB_UNLOCK( stream->mtx );
77 return nmemb_i - 1;
78 }
79
80 break;
81
82 case _IOLBF:
83 if ( offset > 0 )
84 {
85 size_t bufidx = stream->bufidx;
86 stream->bufidx = offset;
87
88 if ( _PDCLIB_flushbuffer( stream ) == EOF )
89 {
90 /* See comment above. */
91 stream->bufidx = bufidx;
92 _PDCLIB_UNLOCK( stream->mtx );
93 return nmemb_i - 1;
94 }
95
96 stream->bufidx = bufidx - offset;
97 memmove( stream->buffer, stream->buffer + offset, stream->bufidx );
98 }
99 }
100
101 _PDCLIB_UNLOCK( stream->mtx );
102 return nmemb_i;
103 }
104
105 #endif
106
107 #ifdef TEST
108
109 #include "_PDCLIB_test.h"
110
main(void)111 int main( void )
112 {
113 /* Testing covered by fread(). */
114 return TEST_RESULTS;
115 }
116
117 #endif
118