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