tsprint.c - plan9port - [fork] Plan 9 from user space
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       ---
       tsprint.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 }