1 files changed, 23 insertions, 0 deletions
diff --git a/6.1.1/key.c b/6.1.1/key.c
new file mode 100644
index 0000000..f6384fe
--- /dev/null
+++ b/6.1.1/key.c
@@ -0,0 +1,23 @@
+#include <string.h>
+#include "key.h"
+
+struct key *
+bsearch(char *word, struct key tab[], int n)
+{
+	int cond;
+	struct key *low, *high, *mid;
+
+	low = tab;
+	high = tab + n - 1;
+	while (low <= high) {
+		mid = low + (high-low) / 2;
+		if ((cond = strcmp(word, mid->word)) < 0)
+			high = mid - 1;
+		else if (cond > 0)
+			low = mid + 1;
+		else 
+			return mid;
+	}
+
+	return NULL;
+}