sprint.c (707B)
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 }