1 files changed, 32 insertions, 0 deletions
diff --git a/utils.h b/utils.h
index 8723516..96c6de2 100644
--- a/utils.h
+++ b/utils.h
@@ -5,3 +5,35 @@
 // TODO: better error reporting
 #define check(cond, ...) do { if (!(cond)) { fprintf(stderr, __VA_ARGS__); fwrite("\n", 1, 1, stderr); _exit(1); } } while(0)
 #define debug(...) do { if (verbose) fprintf(stderr, __VA_ARGS__); } while(0)
+
+/* 
+ * Helper function to skip past all spaces (and comments)
+ * Returns a pointer to the first non-space character.
+ */
+static inline const char *after_spaces(const char *str)
+{
+    // Skip whitespace and comments:
+  skip_whitespace:
+    switch (*str) {
+        case ' ': case '\r': case '\n': case '\t': {
+            ++str;
+            goto skip_whitespace;
+        }
+        case '#': {
+            while (*str && *str != '\n') ++str;
+            goto skip_whitespace;
+        }
+    }
+    return str;
+}
+
+static inline int matchchar(const char **str, char c)
+{
+    *str = after_spaces(*str);
+    if (**str == c) {
+        ++(*str);
+        return 1;
+    } else {
+        return 0;
+    }
+}