diff options
Diffstat (limited to 'lib/libc/stdio/ungetc.c')
| -rw-r--r-- | lib/libc/stdio/ungetc.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/lib/libc/stdio/ungetc.c b/lib/libc/stdio/ungetc.c deleted file mode 100644 index c0355b7..0000000 --- a/lib/libc/stdio/ungetc.c +++ /dev/null @@ -1,183 +0,0 @@ -/*- - * 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: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. 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. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. 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 REGENTS 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 REGENTS 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. - */ - -#if defined(LIBC_SCCS) && !defined(lint) -#if 0 -static char sccsid[] = "@(#)ungetc.c 8.2 (Berkeley) 11/3/93"; -#endif -static const char rcsid[] = - "$Id$"; -#endif /* LIBC_SCCS and not lint */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include "local.h" -#ifdef _THREAD_SAFE -#include <pthread.h> -#include "pthread_private.h" -#endif - -static int __submore __P((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(fp) - register FILE *fp; -{ - register int i; - register unsigned char *p; - - if (fp->_ub._base == fp->_ubuf) { - /* - * Get a new buffer (rather than expanding the old one). - */ - if ((p = malloc((size_t)BUFSIZ)) == NULL) - return (EOF); - fp->_ub._base = p; - fp->_ub._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 = fp->_ub._size; - p = realloc(fp->_ub._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; - fp->_ub._base = p; - fp->_ub._size = i << 1; - return (0); -} - -int -ungetc(c, fp) - int c; - register FILE *fp; -{ - if (c == EOF) - return (EOF); - if (!__sdidinit) - __sinit(); -#ifdef _THREAD_SAFE - _thread_flockfile(fp,__FILE__,__LINE__); -#endif - 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) { -#ifdef _THREAD_SAFE - _thread_funlockfile(fp); -#endif - return (EOF); - } - if (fp->_flags & __SWR) { - if (__sflush(fp)) { -#ifdef _THREAD_SAFE - _thread_funlockfile(fp); -#endif - 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 >= fp->_ub._size && __submore(fp)) { -#ifdef _THREAD_SAFE - _thread_funlockfile(fp); -#endif - return (EOF); - } - *--fp->_p = c; - fp->_r++; -#ifdef _THREAD_SAFE - _thread_funlockfile(fp); -#endif - 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++; -#ifdef _THREAD_SAFE - _thread_funlockfile(fp); -#endif - return (c); - } - - /* - * Create an ungetc buffer. - * Initially, we will use the `reserve' buffer. - */ - fp->_ur = fp->_r; - fp->_up = fp->_p; - fp->_ub._base = fp->_ubuf; - fp->_ub._size = sizeof(fp->_ubuf); - fp->_ubuf[sizeof(fp->_ubuf) - 1] = c; - fp->_p = &fp->_ubuf[sizeof(fp->_ubuf) - 1]; - fp->_r = 1; -#ifdef _THREAD_SAFE - _thread_funlockfile(fp); -#endif - return (c); -} |
