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Diffstat (limited to 'StdLib/LibC/Stdio/ungetc.c')
| -rw-r--r-- | StdLib/LibC/Stdio/ungetc.c | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/StdLib/LibC/Stdio/ungetc.c b/StdLib/LibC/Stdio/ungetc.c deleted file mode 100644 index d8e1f3afc6..0000000000 --- a/StdLib/LibC/Stdio/ungetc.c +++ /dev/null @@ -1,180 +0,0 @@ -/** @file
- Implementation of ungetc as declared in <stdio.h>.
-
- Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
- This program and the accompanying materials are licensed and made available
- under the terms and conditions of the BSD License that accompanies this
- distribution. The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.
-
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
- Copyright (c) 1990, 1993
- The Regents of the University of California. All rights reserved.
-
- This code is derived from software contributed to Berkeley by
- Chris Torek.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- - Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- - Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- - Neither the name of the University nor the names of its contributors
- may be used to endorse or promote products derived from this software
- without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
-
- NetBSD: ungetc.c,v 1.14 2003/08/07 16:43:34 agc Exp
- ungetc.c 8.2 (Berkeley) 11/3/93
-**/
-#include <LibConfig.h>
-
-#include <assert.h>
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "reentrant.h"
-#include "local.h"
-
-static int __submore(FILE *);
-/*
- * Expand the ungetc buffer `in place'. That is, adjust fp->_p when
- * the buffer moves, so that it points the same distance from the end,
- * and move the bytes in the buffer around as necessary so that they
- * are all at the end (stack-style).
- */
-static int
-__submore(FILE *fp)
-{
- int i;
- unsigned char *p;
-
- _DIAGASSERT(fp != NULL);
- if(fp == NULL) {
- errno = EINVAL;
- return (EOF);
- }
-
- if (_UB(fp)._base == fp->_ubuf) {
- /*
- * Get a new buffer (rather than expanding the old one).
- */
- if ((p = malloc((size_t)BUFSIZ)) == NULL)
- return (EOF);
- _UB(fp)._base = p;
- _UB(fp)._size = BUFSIZ;
- p += BUFSIZ - sizeof(fp->_ubuf);
- for (i = sizeof(fp->_ubuf); --i >= 0;)
- p[i] = fp->_ubuf[i];
- fp->_p = p;
- return (0);
- }
- i = _UB(fp)._size;
- p = realloc(_UB(fp)._base, (size_t)(i << 1));
- if (p == NULL)
- return (EOF);
- /* no overlap (hence can use memcpy) because we doubled the size */
- (void)memcpy((void *)(p + i), (void *)p, (size_t)i);
- fp->_p = p + i;
- _UB(fp)._base = p;
- _UB(fp)._size = i << 1;
- return (0);
-}
-
-int
-ungetc(int c, FILE *fp)
-{
- _DIAGASSERT(fp != NULL);
- if(fp == NULL) {
- errno = EINVAL;
- return (EOF);
- }
-
- if (c == EOF)
- return (EOF);
- if (!__sdidinit)
- __sinit();
- FLOCKFILE(fp);
- _SET_ORIENTATION(fp, -1);
- if ((fp->_flags & __SRD) == 0) {
- /*
- * Not already reading: no good unless reading-and-writing.
- * Otherwise, flush any current write stuff.
- */
- if ((fp->_flags & __SRW) == 0) {
- FUNLOCKFILE(fp);
- return (EOF);
- }
- if (fp->_flags & __SWR) {
- if (__sflush(fp)) {
- FUNLOCKFILE(fp);
- return (EOF);
- }
- fp->_flags &= ~__SWR;
- fp->_w = 0;
- fp->_lbfsize = 0;
- }
- fp->_flags |= __SRD;
- }
- c = (unsigned char)c;
-
- /*
- * If we are in the middle of ungetc'ing, just continue.
- * This may require expanding the current ungetc buffer.
- */
- if (HASUB(fp)) {
- if (fp->_r >= _UB(fp)._size && __submore(fp)) {
- FUNLOCKFILE(fp);
- return (EOF);
- }
- *--fp->_p = (unsigned char)c;
- fp->_r++;
- FUNLOCKFILE(fp);
- return (c);
- }
- fp->_flags &= ~__SEOF;
-
- /*
- * If we can handle this by simply backing up, do so,
- * but never replace the original character.
- * (This makes sscanf() work when scanning `const' data.)
- */
- if (fp->_bf._base != NULL && fp->_p > fp->_bf._base &&
- fp->_p[-1] == c) {
- fp->_p--;
- fp->_r++;
- FUNLOCKFILE(fp);
- return (c);
- }
-
- /*
- * Create an ungetc buffer.
- * Initially, we will use the `reserve' buffer.
- */
- fp->_ur = fp->_r;
- fp->_up = fp->_p;
- _UB(fp)._base = fp->_ubuf;
- _UB(fp)._size = sizeof(fp->_ubuf);
- fp->_ubuf[sizeof(fp->_ubuf) - 1] = (unsigned char)c;
- fp->_p = &fp->_ubuf[sizeof(fp->_ubuf) - 1];
- fp->_r = 1;
- FUNLOCKFILE(fp);
- return (c);
-}
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