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 /* TODO: Should line-buffered streams be flushed on '\n' or system EOL? */
31 if ( ( stream->buffer[ stream->bufidx++ ] = ((char*)ptr)[ nmemb_i * size + size_i ] ) == '\n' )
33 /* Remember last newline, in case we have to do a partial line-buffered flush */
34 offset = stream->bufidx;
37 if ( stream->bufidx == stream->bufsize )
39 if ( _PDCLIB_flushbuffer( stream ) == EOF )
41 /* Returning number of objects completely buffered */
48 /* Fully-buffered streams are OK. Non-buffered streams must be flushed,
49 line-buffered streams only if there's a newline in the buffer.
51 switch ( stream->status & ( _IONBF | _IOLBF ) )
54 if ( _PDCLIB_flushbuffer( stream ) == EOF )
56 /* We are in a pinch here. We have an error, which requires a
57 return value < nmemb. On the other hand, all objects have
58 been written to buffer, which means all the caller had to
59 do was removing the error cause, and re-flush the stream...
60 Catch 22. We'll return a value one short, to indicate the
61 error, and can't really do anything about the inconsistency.
68 size_t bufidx = stream->bufidx;
69 stream->bufidx = offset;
70 if ( _PDCLIB_flushbuffer( stream ) == EOF )
72 /* See comment above. */
73 stream->bufidx = bufidx;
76 stream->bufidx = bufidx - offset;
77 memmove( stream->buffer, stream->buffer + offset, stream->bufidx );
86 #include <_PDCLIB_test.h>
92 TESTCASE( ( fh = fopen( testfile, "w" ) ) != NULL );
93 TESTCASE( fwrite( "SUCCESS testing fwrite()\n", 1, 25, fh ) == 25 );
94 TESTCASE( fclose( fh ) == 0 );
95 /* TODO: Add readback test. */
96 TESTCASE( remove( testfile ) == 0 );