scc

commit 8a590d4b21a22baaacf934ece3f0372e6b72faba
parent 3cb21279e81fde0e4dc9b10061b9aa2ecd7225b5
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sun,  6 Nov 2022 20:26:11 +0100

libc: Protect definitions of MB_CUR_MAX

MB_CUR_MAX is defined in limits.h and stdlib.h and it
implies that the inclusion guards cannot protect
against multiple definitions of it.

Diffstat:
M
include/limits.h
 | 
2
++
M
include/stdlib.h
 | 
3
+++
A
src/libc/wchar/_validutf8.c
 | 
15
+++++++++++++++

3 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/include/limits.h b/include/limits.h
@@ -3,6 +3,8 @@
 
 #include <arch/limits.h>
 
+#ifndef MB_LEN_MAX
 #define MB_LEN_MAX 4
+#endif
 
 #endif
diff --git a/include/stdlib.h b/include/stdlib.h
@@ -11,7 +11,10 @@
 
 #define _ATEXIT_MAX 32
 
+#ifndef MB_CUR_MAX
 #define MB_CUR_MAX 4
+#endif
+
 #define RAND_MAX 32767
 
 typedef struct {
diff --git a/src/libc/wchar/_validutf8.c b/src/libc/wchar/_validutf8.c
@@ -0,0 +1,15 @@
+#include <wchar.h>
+
+#include "../libc.h"
+
+int
+_validutf8(wchar_t wc)
+{
+	if (wc >= 0xD800 && wc < 0xDBFF)
+		return 0;
+	if (wc >= 0xDC00 && wc < 0xDCFF)
+		return 0;
+	if (wc > 0x10FFFF)
+		return 0;
+	return 1;
+}