From fe3ab5580d5231e1940f25baefd8a97a036d67a2 Mon Sep 17 00:00:00 2001
From: Johnny Richard <johnny@johnnyrichard.com>
Date: Sun, 14 Dec 2025 09:48:13 +0100
Subject: Initial commit

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
---
 bf.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 bf.c

(limited to 'bf.c')

diff --git a/bf.c b/bf.c
new file mode 100644
index 0000000..862f88e
--- /dev/null
+++ b/bf.c
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+int main(int argc, char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s file.bf\n", argv[0]); 
+		exit(EXIT_FAILURE);
+	}
+
+	FILE *fp = fopen(argv[1], "r");
+	fseek(fp, 0, SEEK_END);
+	size_t program_size = ftell(fp);
+	fseek(fp, 0, SEEK_SET);
+
+	char program[program_size + 1];
+	program[program_size] = 0;
+
+	fread(program, sizeof(uint8_t), program_size, fp);
+
+	fclose(fp);
+
+	size_t dp = 0;
+	size_t pc = 0;
+	uint8_t mem[3000] = { 0 };
+
+	while (pc < program_size) {
+		switch (program[pc]) {
+			case '>': {
+				dp++;
+				break;
+			}
+			case '<': {
+				dp--;
+				break;
+			}
+			case '+': {
+				mem[dp]++;
+				break;
+			}
+			case '-': {
+				mem[dp]--;
+				break;
+			}
+			case ',': {
+				mem[dp] = getchar();
+				break;
+			}
+			case '.': {
+				putchar(mem[dp]);
+				break;
+			}
+			case '[': {
+				if (mem[dp] == 0) {
+					size_t l = 1;
+					while (l) {
+						switch (program[++pc]) {
+							case '[': {
+								l++;
+								break;
+							}
+							case ']': {
+								l--;
+								break;
+							}
+						}
+					}
+				}
+				break;
+			}
+			case ']': {
+				if (mem[dp] != 0) {
+					size_t l = 1;
+					while (l) {
+						switch (program[--pc]) {
+							case ']': { l++;
+								break;
+							}
+							case '[': {
+								l--;
+								break;
+							}
+						}
+					}
+				}
+				break;
+			}
+		}
+		pc++;
+	}
+
+	return EXIT_SUCCESS;
+}
-- 
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