diff options
Diffstat (limited to 'mit-pthreads/stdio/ungetc.c')
| -rw-r--r-- | mit-pthreads/stdio/ungetc.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/mit-pthreads/stdio/ungetc.c b/mit-pthreads/stdio/ungetc.c new file mode 100644 index 00000000000..e035f93d5f2 --- /dev/null +++ b/mit-pthreads/stdio/ungetc.c @@ -0,0 +1,155 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * Copyright (c) 1993, 1994 Chris Provenzano. + * 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) +/*static char *sccsid = "from: @(#)ungetc.c 5.6 (Berkeley) 5/4/91";*/ +static char *rcsid = "$Id$"; +#endif /* LIBC_SCCS and not lint */ + +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "local.h" + +/* + * 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 +__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, i << 1); + if (p == NULL) + return (EOF); + (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); +} + +ungetc(c, fp) + int c; + register FILE *fp; +{ + if (c == EOF) + return (EOF); + __sinit (); + + flockfile(fp); + 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) + c = EOF; + goto ungetc_end; + if (fp->_flags & __SWR) { + if (__sflush(fp)) + c = EOF; + goto ungetc_end; + 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)) + return (EOF); + *--fp->_p = c; + fp->_r++; + goto ungetc_end; + } + + /* + * 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++; + goto ungetc_end; + } + + /* + * 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; + +ungetc_end:; + funlockfile(fp); + return (c); +} |