add: logger

src/Makefile

@@ -4,7 +4,7 @@ NAME=gdut-drcom
 
 CFLAGS+= -Wall -O3 -fPIC -DDEBUG -DVERSION=$(VERSION)
 
-objects= config.o auth.o
+objects= config.o auth.o logger.o
 
 # detect OS
 ifeq ($(OS), Windows_NT)

src/logger.c

+#include "logger.h"
+
+Logger * Logger_create( void )
+{
+    Logger *l = (Logger *)malloc(sizeof(Logger));
+    if ( l == NULL )
+        return NULL;
+
+    l->datetime_format = (char *)"%Y-%m-%d %H:%M:%S";
+    l->level = LOG_INFO;
+    l->fp    = stdout;
+
+    return l;
+}
+
+void Logger_free(Logger *l)
+{
+    if ( l != NULL ) {
+        if ( fileno(l->fp) != STDOUT_FILENO )
+            fclose(l->fp);
+        free(l);
+    }
+}
+
+void log_add(Logger *l, int level, const char *msg)
+{
+    if (level < l->level) return;
+
+    time_t meow = time(NULL);
+    char buf[64];
+
+    strftime(buf, sizeof(buf), l->datetime_format, localtime(&meow));
+    fprintf(l->fp, "[%d] %c, %s : %s\n",
+            (int)getpid(),
+            LOG_LEVEL_CHARS[level],
+            buf,
+            msg);
+}
+
+void log_debug(Logger *l, const char *fmt, ...)
+{
+    va_list ap;
+    char msg[LOG_MAX_MSG_LEN];
+
+    va_start(ap, fmt);
+    vsnprintf(msg, sizeof(msg), fmt, ap);
+    log_add(l, LOG_DEBUG, msg);
+    va_end(ap);
+}
+
+void log_info(Logger *l, const char *fmt, ...)
+{
+    va_list ap;
+    char msg[LOG_MAX_MSG_LEN];
+
+    va_start(ap, fmt);
+    vsnprintf(msg, sizeof(msg), fmt, ap);
+    log_add(l, LOG_INFO, msg);
+    va_end(ap);
+}
+
+void log_warn(Logger *l, const char *fmt, ...)
+{
+    va_list ap;
+    char msg[LOG_MAX_MSG_LEN];
+
+    va_start(ap, fmt);
+    vsnprintf(msg, sizeof(msg), fmt, ap);
+    log_add(l, LOG_WARN, msg);
+    va_end(ap);
+}
+
+void log_error(Logger *l, const char *fmt, ...)
+{
+    va_list ap;
+    char msg[LOG_MAX_MSG_LEN];
+
+    va_start(ap, fmt);
+    vsnprintf(msg, sizeof(msg), fmt, ap);
+    log_add(l, LOG_ERROR, msg);
+    va_end(ap);
+}

src/logger.h

+#ifndef _LOGGER_H_
+#define _LOGGER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <stdarg.h>
+#include <unistd.h>
+
+#define LOG_DEBUG 0
+#define LOG_INFO  1
+#define LOG_WARN  2
+#define LOG_ERROR 3
+
+#define LOG_LEVEL_CHARS "DIWEF"
+#define LOG_MAX_MSG_LEN 1024
+
+struct _Logger {
+    int level;
+    char *datetime_format;
+    FILE *fp;
+};
+
+typedef struct _Logger Logger;
+
+Logger * Logger_create( void );
+void Logger_free(Logger *l);
+void log_add(Logger *l, int level, const char *msg);
+void log_debug(Logger *l, const char *fmt, ...);
+void log_info(Logger *l, const char *fmt, ...);
+void log_warn(Logger *l, const char *fmt, ...);
+void log_error(Logger *l, const char *fmt, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif