1 files changed, 20 insertions, 0 deletions
diff --git a/src/string/strcspn.c b/src/string/strcspn.c
new file mode 100644
index 00000000..439b7be4
--- /dev/null
+++ b/src/string/strcspn.c
@@ -0,0 +1,20 @@
+#include <string.h>
+
+#define BITOP(a,b,op) \
+ ((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a))))
+
+size_t strcspn(const char *_s, const char *_c)
+{
+	const unsigned char *s = _s;
+	const unsigned char *c = _c;
+	const unsigned char *a = s;
+	size_t byteset[32/sizeof(size_t)];
+
+	if (!c[0]) return strlen(s);
+	if (!c[1]) return (s=strchr(s, *c)) ? s-a : strlen(a);
+
+	memset(byteset, 0, sizeof byteset);
+	for (; *c && BITOP(byteset, *c, |=); c++);
+	for (; *s && !BITOP(byteset, *s, &); s++);
+	return s-a;
+}