+++ /dev/null
-/*-
- * 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)
-static char sccsid[] = "@(#)fgetln.c 8.2 (Berkeley) 1/2/94";
-#endif /* LIBC_SCCS and not lint */
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD: src/lib/libc/stdio/fgetln.c,v 1.10 2004/07/16 05:52:51 tjr Exp $");
-
-#include "namespace.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "un-namespace.h"
-#include "libc_private.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 (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. Fgetln 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;
-
- FLOCKFILE(fp);
- ORIENT(fp, -1);
- /* make sure there is input */
- if (fp->_r <= 0 && __srefill(fp)) {
- *lenp = 0;
- FUNLOCKFILE(fp);
- return (NULL);
- }
-
- /* look for a newline in the input */
- if ((p = memchr((void *)fp->_p, '\n', (size_t)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;
- FUNLOCKFILE(fp);
- 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
- * accomodate 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', (size_t)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
- FUNLOCKFILE(fp);
- return ((char *)fp->_lb._base);
-
-error:
- *lenp = 0; /* ??? */
- FUNLOCKFILE(fp);
- return (NULL); /* ??? */
-}
projects / apple / libc.git / blobdiff