getdelim.c

/*      $NetBSD: getdelim.c,v 1.2 2015/12/25 20:12:46 joerg Exp $       */
/*      NetBSD-src: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp    */
 
/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */
 
#ifndef BUFSIZ
#define BUFSIZ 512
#endif
 
ssize_t
compat_getdelim_(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
{
        char *ptr, *eptr;
 
 
        if (*buf == NULL || *bufsiz == 0) {
                *bufsiz = BUFSIZ;
                if ((*buf = raw_malloc(*bufsiz)) == NULL)
                        return -1;
        }
 
        for (ptr = *buf, eptr = *buf + *bufsiz;;) {
                int c = fgetc(fp);
                if (c == -1) {
                        if (feof(fp)) {
                                ssize_t diff = (ssize_t)(ptr - *buf);
                                if (diff != 0) {
                                        *ptr = '\0';
                                        return diff;
                                }
                        }
                        return -1;
                }
                *ptr++ = c;
                if (c == delimiter) {
                        *ptr = '\0';
                        return ptr - *buf;
                }
                if (ptr + 2 >= eptr) {
                        char *nbuf;
                        size_t nbufsiz = *bufsiz * 2;
                        ssize_t d = ptr - *buf;
                        if (nbufsiz < *bufsiz ||
                            (nbuf = raw_realloc(*buf, nbufsiz)) == NULL)
                                return -1;
                        *buf = nbuf;
                        *bufsiz = nbufsiz;
                        eptr = nbuf + nbufsiz;
                        ptr = nbuf + d;
                }
        }
}