From eeff5e273f22aa28e81ab080e9ffdce85ac394b8 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Fri, 22 Oct 2021 09:59:31 +0200
Subject: Prepare skeleton for bytecode interpreter

---
 src/treewalk/string_view.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/treewalk/string_view.c

(limited to 'src/treewalk/string_view.c')

diff --git a/src/treewalk/string_view.c b/src/treewalk/string_view.c
new file mode 100644
index 0000000..39fabe9
--- /dev/null
+++ b/src/treewalk/string_view.c
@@ -0,0 +1,40 @@
+#include "string_view.h"
+
+char
+sv_next(StringView *sv) {
+    if (sv->n == 0) {
+        return '\0';
+    }
+    char c = sv->start[0];
+    sv->start++;
+    sv->n--;
+    return c;
+}
+
+char
+sv_peek(const StringView *sv) {
+    if (sv->n == 0) {
+        return '\0';
+    }
+    return sv->start[0];
+}
+
+bool
+sv_equal(const StringView *a, const StringView *b) {
+    if (a->n != b->n) {
+        return false;
+    }
+    for (size_t i = 0; i < a->n; i++) {
+        if (a->start[i] != b->start[i]) {
+            return false;
+        }
+    }
+    return true;
+}
+
+void
+sv_write(const StringView *sv, FILE *file) {
+    for (size_t i = 0; i < sv->n; i++) {
+        putc(sv->start[i], file);
+    }
+}
-- 
cgit v1.2.1