sprint.c (724B) download
1/* Copyright (c) 2002-2006 Lucent Technologies; see LICENSE */
2#include "fmt.h"
3#include "fmtdef.h"
4#include "plan9.h"
5
6#include <fmt.h>
7#include <stdarg.h>
8
9int sprint(char* buf, char* fmt, ...) {
10 int n;
11 uint len;
12 va_list args;
13
14 len = 1 << 30; /* big number, but sprint is deprecated anyway */
15 /*
16 * on PowerPC, the stack is near the top of memory, so
17 * we must be sure not to overflow a 32-bit pointer.
18 *
19 * careful! gcc-4.2 assumes buf+len < buf can never be true and
20 * optimizes the test away. casting to uintptr works around this bug.
21 */
22 if ((uintptr) buf + len < (uintptr) buf)
23 len = -(uintptr) buf - 1;
24
25 va_start(args, fmt);
26 n = vsnprint(buf, len, fmt, args);
27 va_end(args);
28 return n;
29}