1 files changed, 28 insertions, 0 deletions

diff --git a/src/bootstrap/readline.c b/src/bootstrap/readline.c
new file mode 100644
index 0000000..dfd8285
--- /dev/null
+++ b/src/bootstrap/readline.c
@@ -0,0 +1,28 @@
+#define READLINE_VALID_CHAR(C) (((u8)(C) >= 0x20 && (u8)(C) < 0x7F) || (C) == '\n')
+
+StringView
+read_line(FILE *fd, char delimiter) {
+    #define RL_BUF_SIZE 1024
+    static char readline_buf[RL_BUF_SIZE];
+
+    // Clear buffer.
+    for (size_t i = 0; i < RL_BUF_SIZE; i++) {
+        readline_buf[i] = 0;
+    }
+
+    // Barebones readline implementation.
+    size_t n = 0;
+    char c;
+    while ((c = getc(fd)) != delimiter) {
+        if (c == '\b') {
+            readline_buf[n] = '\0';
+            n--;
+        } else if (READLINE_VALID_CHAR(c) && n < RL_BUF_SIZE) {
+            readline_buf[n] = c;
+            n++;
+        }
+    }
+
+    return (StringView){.start = (char *)&readline_buf, .n = n};
+}
+