3 /* fwrite( const void *, size_t, size_t, FILE * )
5 This file is part of the Public Domain C Library (PDCLib).
6 Permission is granted to use, modify, and / or redistribute at will.
10 #include <_PDCLIB_glue.h>
17 size_t fwrite( const void * _PDCLIB_restrict ptr, size_t size, size_t nmemb, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
19 if ( _PDCLIB_prepwrite( stream ) == EOF )
23 _PDCLIB_size_t offset = 0;
26 for ( nmemb_i = 0; nmemb_i < nmemb; ++nmemb_i )
28 for ( size_t size_i = 0; size_i < size; ++size_i )
30 if ( ( stream->buffer[ stream->bufidx++ ] = ((char*)ptr)[ nmemb_i * size + size_i ] ) == '\n' )
32 /* Remember last newline, in case we have to do a partial line-buffered flush */
33 offset = stream->bufidx;
36 if ( stream->bufidx == stream->bufsize )
38 if ( _PDCLIB_flushbuffer( stream ) == EOF )
40 /* Returning number of objects completely buffered */
47 /* Fully-buffered streams are OK. Non-buffered streams must be flushed,
48 line-buffered streams only if there's a newline in the buffer.
50 switch ( stream->status & ( _IONBF | _IOLBF ) )
53 if ( _PDCLIB_flushbuffer( stream ) == EOF )
55 /* We are in a pinch here. We have an error, which requires a
56 return value < nmemb. On the other hand, all objects have
57 been written to buffer, which means all the caller had to
58 do was removing the error cause, and re-flush the stream...
59 Catch 22. We'll return a value one short, to indicate the
60 error, and can't really do anything about the inconsistency.
67 size_t bufidx = stream->bufidx;
68 stream->bufidx = offset;
69 if ( _PDCLIB_flushbuffer( stream ) == EOF )
71 /* See comment above. */
72 stream->bufidx = bufidx;
75 stream->bufidx = bufidx - offset;
76 memmove( stream->buffer, stream->buffer + offset, stream->bufidx );
85 #include <_PDCLIB_test.h>
91 TESTCASE( ( fh = fopen( testfile, "w" ) ) != NULL );
92 TESTCASE( fwrite( "SUCCESS testing fwrite()\n", 1, 25, fh ) == 25 );
93 TESTCASE( fclose( fh ) == 0 );
94 /* TODO: Add readback test. */
95 TESTCASE( remove( testfile ) == 0 );