fix(klibc): fix incorrect %hh format output for values in [0x80, 0xff]

rsj123 · Rbb666 · commit 4a090fbd5b9b · 2026-02-25T10:51:53.000+08:00
diff --git a/src/klibc/rt_vsnprintf_tiny.c b/src/klibc/rt_vsnprintf_tiny.c
@@ -560,7 +560,7 @@ int rt_vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
         }
         else if (qualifier == 'H')
         {
-            num = (rt_int8_t)va_arg(args, rt_int32_t);
+            num = (rt_uint8_t)va_arg(args, rt_int32_t);
             if (flags & SIGN)
             {
                 num = (rt_int8_t)num;

Original file line number	Diff line number	Diff line change
`@@ -560,7 +560,7 @@ int rt_vsnprintf(char buf, size_t size, const char fmt, va_list args)`
`560`	`560`	`}`
`561`	`561`	`else if (qualifier == 'H')`
`562`	`562`	`{`
`563`		`- num = (rt_int8_t)va_arg(args, rt_int32_t);`
	`563`	`+ num = (rt_uint8_t)va_arg(args, rt_int32_t);`
`564`	`564`	`if (flags & SIGN)`
`565`	`565`	`{`
`566`	`566`	`num = (rt_int8_t)num;`