1 files changed, 133 insertions, 0 deletions
diff --git a/core/logger.c b/core/logger.c
new file mode 100644
index 0000000..29f371e
--- /dev/null
+++ b/core/logger.c
@@ -0,0 +1,133 @@
+// file    : core/logger.c
+// project : Salis-VM
+// author  : Paul Oliver <contact@pauloliver.dev>
+
+// index:
+// [section] includes
+// [section] macros
+// [section] extern globals
+// [section] definitions
+
+// ----------------------------------------------------------------------------
+// [section] includes
+// ----------------------------------------------------------------------------
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "logger.h"
+
+// ----------------------------------------------------------------------------
+// [section] macros
+// ----------------------------------------------------------------------------
+#define COLOR_CLEAR "\033[0m"
+#define COLOR_TRACE "\033[1;34m"
+#define COLOR_INFO "\033[1;32m"
+#define COLOR_ATTENTION "\033[1;33m"
+
+#define LEVEL_TRACE "TRACE"
+#define LEVEL_INFO "INFO"
+#define LEVEL_ATTENTION "ATTENTION"
+
+// ----------------------------------------------------------------------------
+// [section] extern globals
+// ----------------------------------------------------------------------------
+void (*log_trace)(const char *format, ...) = log_trace_to_stdout;
+void (*log_info)(const char *format, ...) = log_info_to_stdout;
+void (*log_attention)(const char *format, ...) = log_attention_to_stdout;
+
+// ----------------------------------------------------------------------------
+// [section] definitions
+// ----------------------------------------------------------------------------
+static void log_to_buffer(char buffer[LOG_BUFFER_SIZE], const char *color_code, const char *level, const char *format, va_list args) {
+    assert(level);
+    assert(format);
+
+    struct timespec ts;
+    clock_gettime(CLOCK_REALTIME, &ts);
+    int msec = (int)(ts.tv_nsec / 1000000l);
+    struct tm tm = *localtime(&ts.tv_sec);
+    pid_t pid = getpid();
+
+    int rem = snprintf(
+        buffer,
+        LOG_BUFFER_SIZE,
+        "%s%d-%02d-%02d %02d:%02d:%02d.%03d %07d [%s]%s ",
+        color_code ? color_code : "",
+        tm.tm_year + 1900,
+        tm.tm_mon + 1,
+        tm.tm_mday,
+        tm.tm_hour,
+        tm.tm_min,
+        tm.tm_sec,
+        msec,
+        pid,
+        level,
+        color_code ? COLOR_CLEAR : ""
+    );
+
+    vsnprintf(buffer + rem, LOG_BUFFER_SIZE - rem, format, args);
+}
+
+void log_trace_to_stdout(const char *format, ...) {
+    assert(format);
+    (void)format;
+
+#if defined(LOG_TRACE)
+    va_list args;
+    va_start(args, format);
+    char buffer[LOG_BUFFER_SIZE];
+    log_to_buffer(buffer, COLOR_TRACE, LEVEL_TRACE, format, args);
+    printf("\r%s\n", buffer);
+    fflush(stdout);
+    va_end(args);
+#endif
+}
+
+void log_info_to_stdout(const char *format, ...) {
+    assert(format);
+    va_list args;
+    va_start(args, format);
+    char buffer[LOG_BUFFER_SIZE];
+    log_to_buffer(buffer, COLOR_INFO, LEVEL_INFO, format, args);
+    printf("\r%s\n", buffer);
+    fflush(stdout);
+    va_end(args);
+}
+
+void log_attention_to_stdout(const char *format, ...) {
+    assert(format);
+    va_list args;
+    va_start(args, format);
+    char buffer[LOG_BUFFER_SIZE];
+    log_to_buffer(buffer, COLOR_ATTENTION, LEVEL_ATTENTION, format, args);
+    printf("\r%s\n", buffer);
+    fflush(stdout);
+    va_end(args);
+}
+
+void vlog_trace_to_buffer(char buffer[LOG_BUFFER_SIZE], const char *format, va_list args) {
+    assert(format);
+    assert(args);
+    (void)buffer;
+    (void)format;
+    (void)args;
+
+#if defined(LOG_TRACE)
+    log_to_buffer(buffer, NULL, LEVEL_TRACE, format, args);
+#endif
+}
+
+void vlog_info_to_buffer(char buffer[LOG_BUFFER_SIZE], const char *format, va_list args) {
+    assert(format);
+    assert(args);
+    log_to_buffer(buffer, NULL, LEVEL_INFO, format, args);
+}
+
+void vlog_attention_to_buffer(char buffer[LOG_BUFFER_SIZE], const char *format, va_list args) {
+    assert(format);
+    assert(args);
+    log_to_buffer(buffer, NULL, LEVEL_ATTENTION, format, args);
+}