1 files changed, 27 insertions, 1 deletions
diff --git a/kernel/lib/sv.c b/kernel/lib/sv.c
index 580e63a..2143a4b 100644
--- a/kernel/lib/sv.c
+++ b/kernel/lib/sv.c
@@ -54,7 +54,11 @@ struct sv sv_skip_chars(const struct sv input, const char *chars) {
   return r;
 }
 
-uint64_t sv_parse_unsigned_number(struct sv input, struct sv *rest) {
+uint64_t sv_parse_unsigned_number(struct sv input, struct sv *rest,
+                                  int *got_num) {
+  if (got_num) {
+    *got_num = 0;
+  }
   uint64_t r = 0;
   size_t i = 0;
   for (; i < input.length; i++) {
@@ -64,6 +68,11 @@ uint64_t sv_parse_unsigned_number(struct sv input, struct sv *rest) {
     r *= 10;
     r += input.s[i] - '0';
   }
+  if (i > 0) {
+    if (got_num) {
+      *got_num = 1;
+    }
+  }
   input.length -= i;
   input.s += i;
   if (rest) {
@@ -229,6 +238,23 @@ struct sv sv_clone(struct sv s) {
   return new_sv;
 }
 
+int sv_try_eat(struct sv input, struct sv *rest, struct sv b) {
+  if (input.length < b.length) {
+    return 0;
+  }
+  for (size_t i = 0; i < b.length; i++) {
+    if (input.s[i] != b.s[i]) {
+      return 0;
+    }
+  }
+  input.s += b.length;
+  input.length -= b.length;
+  if (rest) {
+    *rest = input;
+  }
+  return 1;
+}
+
 char *sv_copy_to_c(struct sv s, char *out, size_t buffer_length) {
   int copy_len = min(s.length + 1, buffer_length);
   if (0 == copy_len) {