1 files changed, 58 insertions, 0 deletions
diff --git a/sem1/osc/mm10/opg4.l b/sem1/osc/mm10/opg4.l
new file mode 100644
index 0000000..9d18634
--- /dev/null
+++ b/sem1/osc/mm10/opg4.l
@@ -0,0 +1,58 @@
+%{
+
+#include <stdio.h>
+#include <stdint.h>
+
+#define BEGIN_T 1
+#define END_T 2
+#define NUM_T 3
+#define VAR_T 4
+#define HASHSIZE 100
+
+%}
+
+VAR			[a-zA-Z][a-zA-Z\_\-0-9]*
+TAL			[0-9]+
+
+%%
+
+begin		{printf("Found a BEGIN\n"); return BEGIN_T;}
+end			{printf("Found a END\n"); return END_T;}
+{VAR}		{printf("Found a variable %s\n", yytext); return VAR_T;}
+{TAL}		{printf("Found a number %d\n", strtol(yytext, NULL, 10)); return NUM_T;}
+
+%%
+
+unsigned int hash(char *s) {
+	uint32_t hv = 0;
+	for( int i = 0; s[i] != '\0'; i++ ) {
+		// take MSB 6 bits of hv and xors with LSB of s[i]
+		uint32_t v = ( hv >> 26 ) ^ (s[i] & 0x3f);
+
+		// Push those back on hv
+		hv = (hv << 4) | v;
+	}
+	// Return appropriate size
+	return hv % HASHSIZE;
+}
+
+int main(void) {
+
+	char str[100];
+	while( fgets(str, 100, stdin) ) {
+		printf("%s: %d\n", str, hash(str));
+	}
+
+	return 0;
+
+	for(;;) {
+		int t = yylex();
+		printf("yylex: %d\n", t);
+		if( t == END_T ) {
+			break;
+		}
+	}
+
+	return 0;
+	
+}