sprint.c (724B)
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 9 int 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 }