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872517ddbb
Do not write to bufsiz until we are sure the malloc has succeeded, in case any callers rely on it (which they shouldn't). ok djm@
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/* $NetBSD: getline.c,v 1.1.1.6 2015/01/02 20:34:27 christos Exp $ */
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/* NetBSD: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* NETBSD ORIGINAL: external/bsd/file/dist/src/getline.c */
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#include "includes.h"
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#if 0
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#include "file.h"
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#endif
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#if !HAVE_GETLINE
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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static ssize_t
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getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
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{
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char *ptr, *eptr;
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if (*buf == NULL || *bufsiz == 0) {
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if ((*buf = malloc(BUFSIZ)) == NULL)
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return -1;
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*bufsiz = BUFSIZ;
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}
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for (ptr = *buf, eptr = *buf + *bufsiz;;) {
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int c = fgetc(fp);
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if (c == -1) {
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if (feof(fp)) {
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ssize_t diff = (ssize_t)(ptr - *buf);
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if (diff != 0) {
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*ptr = '\0';
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return diff;
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}
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}
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return -1;
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}
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*ptr++ = c;
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if (c == delimiter) {
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*ptr = '\0';
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return ptr - *buf;
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}
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if (ptr + 2 >= eptr) {
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char *nbuf;
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size_t nbufsiz = *bufsiz * 2;
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ssize_t d = ptr - *buf;
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if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
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return -1;
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*buf = nbuf;
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*bufsiz = nbufsiz;
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eptr = nbuf + nbufsiz;
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ptr = nbuf + d;
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}
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}
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}
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ssize_t
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getline(char **buf, size_t *bufsiz, FILE *fp)
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{
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return getdelim(buf, bufsiz, '\n', fp);
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}
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#endif
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#ifdef TEST
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int
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main(int argc, char *argv[])
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{
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char *p = NULL;
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ssize_t len;
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size_t n = 0;
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while ((len = getline(&p, &n, stdin)) != -1)
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(void)printf("%" SIZE_T_FORMAT "d %s", len, p);
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free(p);
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return 0;
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}
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#endif
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