1 /* Copyright 1998 by the Massachusetts Institute of Technology.
3 * Permission to use, copy, modify, and distribute this
4 * software and its documentation for any purpose and without
5 * fee is hereby granted, provided that the above copyright
6 * notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting
8 * documentation, and that the name of M.I.T. not be used in
9 * advertising or publicity pertaining to distribution of the
10 * software without specific, written prior permission.
11 * M.I.T. makes no representations about the suitability of
12 * this software for any purpose. It is provided "as is"
13 * without express or implied warranty.
20 #include "ares_private.h"
22 /* This is an internal function. Its contract is to read a line from
23 * a file into a dynamically allocated buffer, zeroing the trailing
24 * newline if there is one. The calling routine may call
25 * ares__read_line multiple times with the same buf and bufsize
26 * pointers; *buf will be reallocated and *bufsize adjusted as
27 * appropriate. The initial value of *buf should be NULL. After the
28 * calling routine is done reading lines, it should free *buf.
30 int ares__read_line(FILE *fp, char **buf, int *bufsize)
46 if (!fgets(*buf + offset, *bufsize - offset, fp))
47 return (offset != 0) ? 0 : (ferror(fp)) ? ARES_EFILE : ARES_EOF;
48 len = offset + strlen(*buf + offset);
49 if ((*buf)[len - 1] == '\n')
56 /* Allocate more space. */
57 newbuf = realloc(*buf, *bufsize * 2);