From bce944d1498eaa3b6940ee234c863b3548a66b37 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Sun, 24 Jan 2021 12:00:11 -0500
Subject: graphics!

---
 src/kernel/log.c | 103 +++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 81 insertions(+), 22 deletions(-)

(limited to 'src/kernel/log.c')

diff --git a/src/kernel/log.c b/src/kernel/log.c
index b5a96cb..8ef2baf 100644
--- a/src/kernel/log.c
+++ b/src/kernel/log.c
@@ -1,33 +1,92 @@
-#include "vga.h"
+#include <stdarg.h>
+#include <stdbool.h>
+
 #include "serial.h"
 #include "log.h"
 
 #define LOG_COM COM1
 
-static const uint8_t log_mode_colors[] = {
-  0x30,
-  0x07,
-  0x4f
+void init_log() {
+  //TODO: move old "sys/current.log"
+  //TODO: open new "sys/current.log"
+}
+
+static const char *const log_prefixes[] = {
+  " [USER] ",
+  " [INFO] ",
+  " [WARN] ",
+  "[ERROR] ",
+  "[PANIC] ",
 };
 
-void set_log_mode(enum log_mode mode) {
-  vga_set_color(log_mode_colors[mode]);
-  vga_printch('\n');
-  vga_printch('\n');
+static inline void logch(char ch) {
+  sout(LOG_COM, ch);
+  //TODO: write to log file as well
 }
 
-void logch(char ch) {
-  if (ch == '\n') {
-    sout(LOG_COM, (uint8_t)'\r');
-    sout(LOG_COM, (uint8_t)'\n');
-  }
-  else
-    sout(LOG_COM, (uint8_t)ch);
+static const char hex_table[] = "0123456789abcdef";
 
-  vga_printch(ch);
-}
+void logf(enum log_level level, const char *format, ...) {
+  va_list args;
+  va_start(args, format);
 
-void logsz(const char *sz) {
-  while (*sz)
-    logch(*sz++);
-}
\ No newline at end of file
+  const char *log_prefix = log_prefixes[level];
+  while (*log_prefix)
+    logch(*(log_prefix++));
+
+  for (const char *fi = format; *fi;)
+    if (*fi != '%')
+      logch(*(fi++));
+    else {
+      switch (*(fi + 1)) {
+      case '%':
+        logch('%');
+        break;
+      case 's':;
+        const char *s = va_arg(args, const char *);
+        while (*s)
+          logch(*(s++));
+        break;
+      case 'd':;
+        const uint32_t d = va_arg(args, uint32_t);
+        if (d == 0) {
+          logch('0');
+          break;
+        }
+        bool zeros = false;
+        for (uint32_t place = 1000000000; place; place /= 10) {
+          uint8_t digit = (d / place) % 10;
+          if (digit)
+            zeros = true;
+          if (zeros)
+            logch(digit | '0');
+        }
+        break;
+      case 'h':;
+        const uint32_t h = va_arg(args, uint32_t);
+        uint32_t shift = 32;
+        if (*(fi + 2) == 'b') {
+          shift = 8;
+          ++fi;
+        }
+        else if (*(fi + 2) == 'w') {
+          shift = 16;
+          ++fi;
+        }
+        else if (*(fi + 2) == 'd') {
+          ++fi;
+        }
+        while (shift)
+          logch(hex_table[(h >> (shift -= 4)) & 0xf]);
+        break;
+      default:
+        logch('%');
+        logch(*(fi + 1));
+      }
+      fi += 2;
+    }
+
+  logch('\n');
+
+  va_end(args);
+}
-- 
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