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-rw-r--r--lib/vsprintf.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 39c99fea7c03..41da0741a663 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1485,7 +1485,10 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
num = va_arg(args, long);
break;
case FORMAT_TYPE_SIZE_T:
- num = va_arg(args, size_t);
+ if (spec.flags & SIGN)
+ num = va_arg(args, ssize_t);
+ else
+ num = va_arg(args, size_t);
break;
case FORMAT_TYPE_PTRDIFF:
num = va_arg(args, ptrdiff_t);