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