1 files changed, 58 insertions, 0 deletions
diff --git a/private/crt32/mbstring/ismbsle.c b/private/crt32/mbstring/ismbsle.c
new file mode 100644
index 000000000..c4f9a0d02
--- /dev/null
+++ b/private/crt32/mbstring/ismbsle.c
@@ -0,0 +1,58 @@
+/***
+*ismbslead.c - True _ismbslead function
+*
+*	Copyright (c) 1987-1993, Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*	Contains the function _ismbslead, which is a true context-sensitive
+*	MBCS lead-byte function.  While much less efficient than _ismbblead,
+*	it is also much more sophisticated, in that it determines whether a
+*	given sub-string pointer points to a lead byte or not, taking into
+*	account the context in the string.
+*
+*Revision History:
+*
+*	08-03-93  KRS	Ported from 16-bit tree.
+*
+*******************************************************************************/
+
+#ifdef	_MBCS
+#include <cruntime.h>
+#include <stddef.h>
+#include <mbdata.h>
+#include <mbctype.h>
+#include <mbstring.h>
+
+/***
+* int _ismbslead(const unsigned char *string, const unsigned char *current);
+*
+*Purpose:
+*
+*   _ismbslead - Check, in context, for MBCS lead byte
+*
+*Entry:
+*   unsigned char *string   - ptr to start of string or previous known lead byte
+*   unsigned char *current  - ptr to position in string to be tested
+*
+*Exit:
+*	TRUE	: -1
+*	FALSE	: 0
+*
+*Exceptions:
+*
+*******************************************************************************/
+
+int _CRTAPI1 _ismbslead(const unsigned char *string, const unsigned char *current)
+{
+	while (string <= current && *string) {
+		if (_ISLEADBYTE((*string))) {
+			if (string++ == current)	/* check lead byte */
+				return -1;
+			if (!(*string))
+				return 0;
+		}
+		++string;
+	}
+	return 0;
+}
+#endif