1 files changed, 54 insertions, 0 deletions
diff --git a/src/cmd/auth/factotum/util.c b/src/cmd/auth/factotum/util.c
new file mode 100644
index 00000000..accddddd
--- /dev/null
+++ b/src/cmd/auth/factotum/util.c
@@ -0,0 +1,54 @@
+#include "std.h"
+#include "dat.h"
+
+static int
+unhex(char c)
+{
+	if('0' <= c && c <= '9')
+		return c-'0';
+	if('a' <= c && c <= 'f')
+		return c-'a'+10;
+	if('A' <= c && c <= 'F')
+		return c-'A'+10;
+	abort();
+	return -1;
+}
+
+int
+hexparse(char *hex, uchar *dat, int ndat)
+{
+	int i, n;
+
+	n = strlen(hex);
+	if(n%2)
+		return -1;
+	n /= 2;
+	if(n > ndat)
+		return -1;
+	if(hex[strspn(hex, "0123456789abcdefABCDEF")] != '\0')
+		return -1;
+	for(i=0; i<n; i++)
+		dat[i] = (unhex(hex[2*i])<<4)|unhex(hex[2*i+1]);
+	return n;
+}
+
+char*
+estrappend(char *s, char *fmt, ...)
+{
+	char *t;
+	int l;
+	va_list arg;
+
+	va_start(arg, fmt);
+	t = vsmprint(fmt, arg);
+	if(t == nil)
+		sysfatal("out of memory");
+	va_end(arg);
+	l = s ? strlen(s) : 0;
+	s = erealloc(s, l+strlen(t)+1);
+	strcpy(s+l, t);
+	free(t);
+	return s;
+}
+
+