Current File : /home/vacivi36/vittasync.vacivitta.com.br/vittasync/node/deps/cares/src/lib/ares__read_line.c
/* MIT License
*
* Copyright (c) 1998 Massachusetts Institute of Technology
* Copyright (c) The c-ares project and its contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "ares_setup.h"
#include "ares.h"
#include "ares_private.h"
/* This is an internal function. Its contract is to read a line from
* a file into a dynamically allocated buffer, zeroing the trailing
* newline if there is one. The calling routine may call
* ares__read_line multiple times with the same buf and bufsize
* pointers; *buf will be reallocated and *bufsize adjusted as
* appropriate. The initial value of *buf should be NULL. After the
* calling routine is done reading lines, it should free *buf.
*/
ares_status_t ares__read_line(FILE *fp, char **buf, size_t *bufsize)
{
char *newbuf;
size_t offset = 0;
size_t len;
if (*buf == NULL) {
*buf = ares_malloc(128);
if (!*buf) {
return ARES_ENOMEM;
}
*bufsize = 128;
}
for (;;) {
int bytestoread = (int)(*bufsize - offset);
if (!fgets(*buf + offset, bytestoread, fp)) {
return (offset != 0) ? 0 : (ferror(fp)) ? ARES_EFILE : ARES_EOF;
}
len = offset + ares_strlen(*buf + offset);
/* Probably means there was an embedded NULL as the first character in
* the line, throw away line */
if (len == 0) {
offset = 0;
continue;
}
if ((*buf)[len - 1] == '\n') {
(*buf)[len - 1] = 0;
break;
}
offset = len;
if (len < *bufsize - 1) {
continue;
}
/* Allocate more space. */
newbuf = ares_realloc(*buf, *bufsize * 2);
if (!newbuf) {
ares_free(*buf);
*buf = NULL;
return ARES_ENOMEM;
}
*buf = newbuf;
*bufsize *= 2;
}
return ARES_SUCCESS;
}
Mini Shell