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52 lines
874 B
C
52 lines
874 B
C
/*
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* fwrite.c
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*
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* Ullrich von Bassewitz, 04.06.1998
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "_file.h"
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size_t fwrite (const void* buf, size_t size, size_t count, FILE* f)
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{
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int bytes;
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/* Is the file open? */
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if ((f->f_flags & _FOPEN) == 0) {
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_errno = EINVAL; /* File not open */
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return -1;
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}
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/* Did we have an error */
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if ((f->f_flags & _FERROR) != 0) {
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/* Cannot write to stream */
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return 0;
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}
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/* How many bytes to write? */
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bytes = size * count;
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if (bytes) {
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/* Write the data. */
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if (write (f->f_fd, buf, bytes) == -1) {
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/* Write error */
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f->f_flags |= _FERROR;
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return -1;
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}
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}
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/* Don't waste time with expensive calculations, assume the write was
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* complete and return the count of items.
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*/
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return count;
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}
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