diff options
Diffstat (limited to 'libc/stdio/fgetln.c')
| -rw-r--r-- | libc/stdio/fgetln.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/libc/stdio/fgetln.c b/libc/stdio/fgetln.c deleted file mode 100644 index 946e1b7..0000000 --- a/libc/stdio/fgetln.c +++ /dev/null @@ -1,150 +0,0 @@ -/* $OpenBSD: fgetln.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */ -/*- - * 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. 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. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include "local.h" - -/* - * Expand the line buffer. Return -1 on error. -#ifdef notdef - * The `new size' does not account for a terminating '\0', - * so we add 1 here. -#endif - */ -int -__slbexpand(FILE *fp, size_t newsize) -{ - void *p; - -#ifdef notdef - ++newsize; -#endif - if ((size_t)fp->_lb._size >= newsize) - return (0); - if ((p = realloc(fp->_lb._base, newsize)) == NULL) - return (-1); - fp->_lb._base = p; - fp->_lb._size = newsize; - return (0); -} - -/* - * Get an input line. The returned pointer often (but not always) - * points into a stdio buffer. Fgetline does not alter the text of - * the returned line (which is thus not a C string because it will - * not necessarily end with '\0'), but does allow callers to modify - * it if they wish. Thus, we set __SMOD in case the caller does. - */ -char * -fgetln(FILE *fp, size_t *lenp) -{ - unsigned char *p; - size_t len; - size_t off; - - /* make sure there is input */ - if (fp->_r <= 0 && __srefill(fp)) { - *lenp = 0; - return (NULL); - } - - /* look for a newline in the input */ - if ((p = memchr((void *)fp->_p, '\n', fp->_r)) != NULL) { - char *ret; - - /* - * Found one. Flag buffer as modified to keep fseek from - * `optimising' a backward seek, in case the user stomps on - * the text. - */ - p++; /* advance over it */ - ret = (char *)fp->_p; - *lenp = len = p - fp->_p; - fp->_flags |= __SMOD; - fp->_r -= len; - fp->_p = p; - return (ret); - } - - /* - * We have to copy the current buffered data to the line buffer. - * As a bonus, though, we can leave off the __SMOD. - * - * OPTIMISTIC is length that we (optimistically) expect will - * accommodate the `rest' of the string, on each trip through the - * loop below. - */ -#define OPTIMISTIC 80 - - for (len = fp->_r, off = 0;; len += fp->_r) { - size_t diff; - - /* - * Make sure there is room for more bytes. Copy data from - * file buffer to line buffer, refill file and look for - * newline. The loop stops only when we find a newline. - */ - if (__slbexpand(fp, len + OPTIMISTIC)) - goto error; - (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p, - len - off); - off = len; - if (__srefill(fp)) - break; /* EOF or error: return partial line */ - if ((p = memchr((void *)fp->_p, '\n', fp->_r)) == NULL) - continue; - - /* got it: finish up the line (like code above) */ - p++; - diff = p - fp->_p; - len += diff; - if (__slbexpand(fp, len)) - goto error; - (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p, - diff); - fp->_r -= diff; - fp->_p = p; - break; - } - *lenp = len; -#ifdef notdef - fp->_lb._base[len] = '\0'; -#endif - return ((char *)fp->_lb._base); - -error: - *lenp = 0; /* ??? */ - return (NULL); /* ??? */ -} |