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67 lines
1.1 KiB
C
67 lines
1.1 KiB
C
/*
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* fread.c
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*
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* Ullrich von Bassewitz, 02.06.1998
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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 fread (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 0;
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}
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/* Did we have an error or EOF? */
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if ((f->f_flags & (_FERROR | _FEOF)) != 0) {
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/* Cannot read from stream */
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return 0;
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}
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/* How many bytes to read? */
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bytes = size * count;
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if (bytes) {
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/* Read the data. */
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bytes = read (f->f_fd, buf, bytes);
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switch (bytes) {
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case -1:
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/* Read error */
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f->f_flags |= _FERROR;
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return 0;
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case 0:
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/* End of file */
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f->f_flags |= _FEOF;
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/* FALLTHROUGH */
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default:
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/* Unfortunately, we cannot avoid the divide here... */
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return bytes / size;
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}
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} else {
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/* 0 bytes read */
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return count;
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}
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}
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