From 1d0ee825c8b70e9456bebc4bf2bc8366c2e89cbd Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Mon, 11 Oct 2021 12:16:28 +0200
Subject: Add a minimal read_line implementation

---
 src/bootstrap/read_line.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/bootstrap/read_line.c

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

diff --git a/src/bootstrap/read_line.c b/src/bootstrap/read_line.c
new file mode 100644
index 0000000..7612d05
--- /dev/null
+++ b/src/bootstrap/read_line.c
@@ -0,0 +1,32 @@
+#define RL_BUF_SIZE 1024
+static char readline_buf[RL_BUF_SIZE];
+
+StringView
+read_line(void) {
+    // 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 (c == EOF || c == '\0') {
+            return (StringView){ .start = NULL, .n = 0 };
+        } else if ((c >= ' ' && c <= '~') && n < RL_BUF_SIZE) {
+            readline_buf[n] = c;
+            n++;
+        }
+    }
+
+    StringView sv = (StringView){
+        .start = (char *)&readline_buf,
+        .n = n,
+    };
+    return sv;
+}
+
-- 
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