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39 lines
661 B
C
39 lines
661 B
C
/*
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* freopen.c
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*
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* Ullrich von Bassewitz, 17.06.1998
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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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FILE* freopen (const char* name, const char* mode, FILE* f)
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{
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/* Check if the file is open, if so, close it */
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if ((f->f_flags & _FOPEN) == 0) {
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/* File is not open */
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_errno = EINVAL; /* File not input */
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return 0;
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}
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/* Close the file. Don't bother setting the flag, it will get
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* overwritten by _fopen.
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*/
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if (close (f->f_fd) < 0) {
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/* An error occured, _oserror is set */
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return 0;
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}
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/* Open the file and return the descriptor */
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return _fopen (name, mode, f);
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}
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