Implement debug console device

libdebugconsole/.gitignore

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+*.o
+*.json
+docs/
+.cache/

libdebugconsole/Makefile

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+include ../make/ufuncs.mk
+
+$(eval $(call add_include,libsystem))
+$(eval $(call add_include,liballoc))
+$(eval $(call add_include,libaux))
+
+cflags += -DPRINTF_INCLUDE_CONFIG_H=1
+
+libname := libdebugconsole
+
+include ../make/lib.mk

libdebugconsole/build/.gitignore

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+*.a

libdebugconsole/debugconsole.c

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+#include <debugconsole.h>
+#include <devices.h>
+#include <liballoc.h>
+#include <printf.h>
+#include <stddef.h>
+#include <system.h>
+
+int debugconsole_print (const char* string, size_t len) {
+  return device_do ("DEBUGCONSOLE", DEBUGCONSOLE_PUTSTR, (void*)string, (void*)&len, NULL, NULL);
+}
+
+void debug_printf (const char* fmt, ...) {
+  va_list args;
+  va_start (args, fmt);
+
+  char* buf = malloc (DEBUG_PRINTF_MAX);
+
+  if (buf == NULL) {
+    va_end (args);
+    return;
+  }
+
+  buf[0] = '\0';
+  int len = vsnprintf (buf, DEBUG_PRINTF_MAX, fmt, args);
+
+  va_end (args);
+
+  debugconsole_print (buf, len);
+  free (buf);
+}

libdebugconsole/debugconsole.h

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+#ifndef _LIBDEBUGCONSOLE_DEBUGCONSOLE_H
+#define _LIBDEBUGCONSOLE_DEBUGCONSOLE_H
+
+#define DEBUG_PRINTF_MAX (16 * 1024)
+
+int debugconsole_print (const char* string, size_t len);
+
+void debug_printf (const char* fmt, ...);
+
+#endif // _LIBDEBUGCONSOLE_DEBUGCONSOLE_H

libdebugconsole/src.mk

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+c += debugconsole.c
+
+o += debugconsole.o