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.
16 static const char rcsid[] = "$Id: ares__read_line.c,v 1.2 1998/11/02 19:13:43 ghudson Exp $";
22 #include "ares_private.h"
24 /* This is an internal function. Its contract is to read a line from
25 * a file into a dynamically allocated buffer, zeroing the trailing
26 * newline if there is one. The calling routine may call
27 * ares__read_line multiple times with the same buf and bufsize
28 * pointers; *buf will be reallocated and *bufsize adjusted as
29 * appropriate. The initial value of *buf should be NULL. After the
30 * calling routine is done reading lines, it should free *buf.
32 int ares__read_line(FILE *fp, char **buf, int *bufsize)
47 if (!fgets(*buf + offset, *bufsize - offset, fp))
48 return (offset != 0) ? 0 : (ferror(fp)) ? ARES_EFILE : ARES_EOF;
49 len = offset + strlen(*buf + offset);
50 if ((*buf)[len - 1] == '\n')
57 /* Allocate more space. */
58 newbuf = realloc(*buf, *bufsize * 2);