45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* $OpenBSD: freadptr.c,v 1.1 2024/08/12 20:56:55 guenther Exp $ */
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/*
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* Copyright (c) 2024 Philip Guenther <guenther@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio_ext.h>
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#include "local.h"
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const char *
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__freadptr(FILE *fp, size_t *sizep)
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{
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if ((fp->_flags & __SRD) && fp->_r > 0) {
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*sizep = fp->_r;
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return fp->_p;
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}
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return NULL;
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}
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void
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__freadptrinc(FILE *fp, size_t inc)
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{
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if (fp->_flags & __SRD) {
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fp->_r -= inc;
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fp->_p += inc;
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if (fp->_r == 0 && HASUB(fp)) {
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/* consumed the pushback buffer; switch back */
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FREEUB(fp);
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if ((fp->_r = fp->_ur) != 0)
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fp->_p = fp->_up;
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}
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}
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}
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