diff options
Diffstat (limited to 'src/lib9/fmt/sprint.c')
| -rw-r--r-- | src/lib9/fmt/sprint.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/lib9/fmt/sprint.c b/src/lib9/fmt/sprint.c index 57150c36..ac68851b 100644 --- a/src/lib9/fmt/sprint.c +++ b/src/lib9/fmt/sprint.c @@ -18,10 +18,19 @@ int sprint(char *buf, char *fmt, ...) { int n; + uint len; va_list args; + len = 1<<30; /* big number, but sprint is deprecated anyway */ + /* + * on PowerPC, the stack is near the top of memory, so + * we must be sure not to overflow a 32-bit pointer. + */ + if(buf+len < buf) + len = -(uint)buf-1; + va_start(args, fmt); - n = vsnprint(buf, 65536, fmt, args); /* big number, but sprint is deprecated anyway */ + n = vsnprint(buf, len, fmt, args); va_end(args); return n; } |