1 files changed, 48 insertions, 0 deletions
diff --git a/csim/util.c b/csim/util.c
new file mode 100644
index 0000000..a09e959
--- /dev/null
+++ b/csim/util.c
@@ -0,0 +1,48 @@
+/*
+	Système Digital
+	2013-2014
+	Alex AUVOLAT
+
+	util.c	Various utility functions used elsewhere
+*/
+
+
+#include "sim.h"
+
+int pow2(int exp) {
+	if (exp == 0) return 1;
+	if (exp == 1) return 2;
+	int k = pow2(exp / 2);
+	return (exp % 2 == 0 ? k * k : 2 * k * k);
+}
+
+t_value read_bool(FILE *stream, t_value *mask) {
+	t_value r = 0;
+	t_value pow = 1;
+
+	char c;
+	if (mask != NULL) *mask = 0;
+
+	for(;;) {
+		fscanf(stream, "%c", &c);
+		if (c == '1') {
+			r |= pow;
+		} else if (c != '0') {
+			break;
+		}
+		if (mask != NULL) (*mask) |= pow;
+
+		pow *= 2;
+	}
+
+	return r;
+}
+
+int is_prefix(char *prefix, char *str) {
+	while (*prefix) {
+		if (*prefix != *str) return 0;
+		prefix++;
+		str++;
+	}
+	return 1;
+}