From 91a86332437e669255002668ba7c97c3efc00cc4 Mon Sep 17 00:00:00 2001
From: Annwan <annwan@annwan.me>
Date: Wed, 3 Jun 2026 00:31:32 +0200
Subject: [PATCH] new: add dump12 utility

---
 include/common.h |  1 +
 src/dump12.c     | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/logging.c    | 10 +++++-
 src/main.c       |  5 ++-
 4 files changed, 99 insertions(+), 2 deletions(-)
 create mode 100644 src/dump12.c

diff --git a/include/common.h b/include/common.h
index 6763445..78de0b1 100644
--- a/include/common.h
+++ b/include/common.h
@@ -38,6 +38,7 @@ typedef double f64;
 // # LOGGING FACILITES
 
 [[gnu::format(printf, 1, 2)]] void log_debug(char const *format, ...);
+[[gnu::format(printf, 1, 2)]] void log_info(char const *format, ...);
 [[gnu::format(printf, 1, 2)]] void log_warn(char const *format, ...);
 [[gnu::format(printf, 1, 2)]] void log_err(char const *format, ...);
 [[gnu::format(printf, 1, 2)]] void log_err_errno(char const *format, ...);
diff --git a/src/dump12.c b/src/dump12.c
new file mode 100644
index 0000000..7d21d40
--- /dev/null
+++ b/src/dump12.c
@@ -0,0 +1,85 @@
+#include <common.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+void dump12_usage() { log_info("Usage: dump12 [-b|-t] [source] [dest]"); }
+
+i32 dump12_main(i32 argc, char *argv[]) {
+    bool to_bin = true;
+    char *inpath = nullptr;
+    char *outpath = nullptr;
+    for (i32 i = 1; i < argc; ++i) {
+        char *arg = argv[i];
+        if (arg[0] == '-' && arg[1] == 'b' && arg[2] == '\0') {
+            to_bin = true;
+        } else if (arg[0] == '-' && arg[1] == 't' && arg[2] == '\0') {
+            to_bin = false;
+        } else if (arg[0] == '-' && arg[1] == 'h' && arg[2] == '\0') {
+            dump12_usage();
+            return 0;
+        } else if (inpath == nullptr) {
+            inpath = arg;
+        } else if (outpath == nullptr) {
+            outpath = arg;
+        } else {
+            log_err("Too many arguments");
+            return 1;
+        }
+    }
+    int infd = (inpath == nullptr) ? 0 : open(inpath, O_RDONLY);
+    if (infd < 0) {
+        log_err_errno("Couldn't open `%s`", inpath);
+        return 1;
+    }
+    int outfd =
+        (inpath == nullptr) ? 1 : open(outpath, O_CREAT | O_TRUNC | O_WRONLY);
+    if (outfd < 0) {
+        log_err_errno("Couldn't open `%s`", outpath);
+        return 1;
+    }
+    if (to_bin) {
+        u12 byte12 = 0;
+        u8 count = 0;
+        u8 c;
+        while (read(infd, &c, 1) > 0) {
+            switch (c) {
+            case '0':
+            case '1':
+            case '2':
+            case '3':
+            case '4':
+            case '5':
+            case '6':
+            case '7':
+                byte12 = (byte12 << 3) | (c - '0');
+                count++;
+                break;
+            default:
+            }
+            if (count == 4) {
+                u8 bs[2] = {byte12 & 0xFF, (byte12 >> 8) & 0xFF};
+                write(outfd, bs, 2);
+                count = 0;
+                byte12 = 0;
+            }
+        }
+    } else {
+        usz bytecount = 0;
+        u8 readbuf[2];
+        while (read(infd, readbuf, 2) > 0) {
+            u12 byte12 = readbuf[0] | (readbuf[1] << 8);
+            bytecount ++;
+            u8 outbuf[5] = {
+                ((byte12 >> 9) & 7) + '0',
+                ((byte12 >> 6) & 7) + '0',
+                ((byte12 >> 3) & 7) + '0',
+                (byte12 & 7) + '0',
+                (bytecount % 8) ? ' ': '\n',
+            };
+            write(outfd, outbuf, 5);
+        }
+    }
+    close(infd);
+    close(outfd);
+    return 0;
+}
diff --git a/src/logging.c b/src/logging.c
index e0db26b..4fe216c 100644
--- a/src/logging.c
+++ b/src/logging.c
@@ -14,7 +14,7 @@ bool logcolours = true;
 void log_debug([[maybe_unused]] const char* format, ...) {}
 #else
 void log_debug(const char* format, ...) {
-    fprintf(logfile, "%s[DEBUG]%s ", logcolours ? "\033[1;44;97m" : "", logcolours ? "\033[0" : "");
+    fprintf(logfile, "%s[DEBUG]%s ", logcolours ? "\033[1;44;97m" : "", logcolours ? "\033[0m" : "");
     va_list va;
     va_start(va);
     vfprintf(logfile, format, va);
@@ -22,6 +22,14 @@ void log_debug(const char* format, ...) {
     fprintf(logfile, "\n");
 }
 #endif
+void log_info(const char* format, ...) {
+    fprintf(logfile, "%s[WARN]%s ", logcolours ? "\033[1;43;97m": "", logcolours ? "\033[0m" : "");
+    va_list va;
+    va_start(va);
+    vfprintf(logfile, format, va);
+    va_end(va);
+    fprintf(logfile, "\n");
+}
 void log_warn(const char* format, ...) {
     fprintf(logfile, "%s[WARN]%s ", logcolours ? "\033[1;43;97m": "", logcolours ? "\033[0m" : "");
     va_list va;
diff --git a/src/main.c b/src/main.c
index 58fbb22..d084d25 100644
--- a/src/main.c
+++ b/src/main.c
@@ -7,9 +7,10 @@ enum subprorgram {
 };
 
 const char *available = (R"m(
-    asm)m");
+    asm, dump12)m");
 
 i32 asm_main(i32 argc, char *argv[]);
+i32 dump12_main(i32 argc, char *argv[]);
 i32 main(i32 argc, char *argv[]) {
     if (argc < 2) {
         log_err("No subprogram called\nAvailable subprograms:%s", available);
@@ -17,6 +18,8 @@ i32 main(i32 argc, char *argv[]) {
     }
     if (!strcmp(argv[1], "asm")) {
         return asm_main(argc - 1, argv + 1);
+    } else if (!strcmp(argv[1], "dump12")) {
+        return dump12_main(argc - 1, argv + 1);
     } else {
         log_err("Unknown subprogram `%s`\nAvailable subpograms:%s", argv[1], available);
         return 1;