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/*
Replace getline() with BSD specific fgetln().
Copyright (C) 2015 JianXiong Zhou <zhoujianxiong2@gmail.com>
Copyright (C) 2015 Jonathan Pelletier <funmungus(a)gmail.com>
This file is part of libscanmem.
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "getline.h"
#if !defined(HAVE_GETLINE) && defined(HAVE_FGETLN)
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/*
* Avoid frequent malloc()/free() calls
* (determined by getline() test on Linux)
*/
#define BUF_MIN 120
ssize_t getline(char **lineptr, size_t *n, FILE *stream)
{
char *lptr;
size_t len = 0;
/* check for invalid arguments */
if (lineptr == NULL || n == NULL) {
errno = EINVAL;
return -1;
}
lptr = fgetln(stream, &len);
if (lptr == NULL) {
/* invalid stream */
errno = EINVAL;
return -1;
}
/*
* getline() returns a null byte ('\0') terminated C string,
* but fgetln() returns characters without '\0' termination
*/
if (*lineptr == NULL) {
*n = BUF_MIN;
goto alloc_buf;
}
/* realloc the original pointer */
if (*n < len + 1) {
free(*lineptr);
*n = len + 1;
alloc_buf:
*lineptr = malloc(*n);
if (*lineptr == NULL) {
*n = 0;
return -1;
}
}
/* copy over the string */
memcpy(*lineptr, lptr, len);
(*lineptr)[len] = '\0';
/*
* getline() and fgetln() both return len including the
* delimiter but without the null byte at the end
*/
return len;
}
#endif
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