From 96d27c2a3e1a0fa0878beb3f9cd02f4b4ed8fdbb Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Fri, 8 Oct 2021 10:25:59 +0200
Subject: Initial commit w/ small readline echo function

---
 src/bootstrap/main.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100755 src/bootstrap/main.c

(limited to 'src/bootstrap/main.c')

diff --git a/src/bootstrap/main.c b/src/bootstrap/main.c
new file mode 100755
index 0000000..861c206
--- /dev/null
+++ b/src/bootstrap/main.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+
+#include "shorthand.h"
+
+typedef struct StringView {
+    char *start;
+    size_t n;
+} StringView;
+
+void
+sv_write(StringView sv) {
+    for (size_t i = 0; i < sv.n; i++) {
+        putchar(sv.start[i]);
+    }
+}
+
+StringView
+read_line(void) {
+    #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 = getchar()) != '\n') {
+        if (c == '\b') {
+            readline_buf[n] = '\0';
+            n--;
+        } else if (((u8)c >= 0x20 && (u8)c <= 0x7F) && n < RL_BUF_SIZE) {
+            readline_buf[n] = c;
+            n++;
+        }
+    }
+
+    return (StringView){.start = (char *)&readline_buf, .n = n};
+}
+
+void
+display(StringView sv) {
+    if (sv.n != 0) {
+        sv_write(sv);
+        printf("\n");
+    }
+}
+
+#define REPL_PROMPT "bdl> "
+
+int
+main(void) {
+    printf("BDL REPL (Press Ctrl-C to exit)\n");
+    while (true) {
+        printf(REPL_PROMPT);
+        display(read_line());
+    }
+    return 0;
+}
-- 
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