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/* -*- mode: c; c-file-style: "openbsd" -*- */
/*
* Copyright (c) 2009 The NetBSD Foundation, Inc.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Roy Marples.
*
* 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 AUTHOR ``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 AUTHOR 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.
*/
/* Several modifications to make the code more portable (and less robust and far less
* efficient) */
#include <stdio.h>
#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "compat.h"
#define MINBUF 128
static ssize_t
___getdelim(char **buf, size_t *buflen, int sep, FILE *fp)
{
int p;
size_t len = 0, newlen;
char *newb;
if (buf == NULL || buflen == NULL) {
errno = EINVAL;
return -1;
}
/* If buf is NULL, we have to assume a size of zero */
if (*buf == NULL) *buflen = 0;
do {
p = fgetc(fp);
if (ferror(fp)) return -1;
if (p == EOF) break;
/* Ensure we can handle it */
if (len > SSIZE_MAX) {
errno = EOVERFLOW;
return -1;
}
newlen = len + 2; /* reserve space for NUL terminator */
if (newlen > *buflen) {
if (newlen < MINBUF) newlen = MINBUF;
#define powerof2(x) ((((x)-1) & (x)) == 0)
if (!powerof2(newlen)) {
/* Grow the buffer to the next power of 2 */
newlen--;
newlen |= newlen >> 1;
newlen |= newlen >> 2;
newlen |= newlen >> 4;
newlen |= newlen >> 8;
newlen |= newlen >> 16;
#if SIZE_MAX > 0xffffffffU
newlen |= newlen >> 32;
#endif
newlen++;
}
newb = realloc(*buf, newlen);
if (newb == NULL) return -1;
*buf = newb;
*buflen = newlen;
}
(*buf)[len++] = p;
} while (p != sep);
/* POSIX demands we return -1 on EOF. */
if (len == 0) return -1;
if (*buf != NULL) (*buf)[len] = '\0';
return (ssize_t)len;
}
ssize_t
getline(char **buf, size_t *buflen, FILE *fp)
{
return ___getdelim(buf, buflen, '\n', fp);
}
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