support log level and two print method

README.md

@@ -1,4 +1,12 @@
 clog
 ====
 
-A useful log
+A useful log with color
+
+Advantage:
+* Small footprint.
+* Enable color print with a define in CFLAGS -DCOLOR_LOG.
+* Display the log time unit in ms.
+* Support log to file
+* Support log level filter
+* Support LOG($LEVEL, ""...) and LOG_$LEVEL(""...) both method

log.c

@@ -11,6 +11,7 @@ static int  log2screen = 1;
 static int  log2file;
 static char log_file_name[128];
 static FILE *log_fp = NULL;
+static int  log_level = DEBUG;
 
 struct {
     char text[8];
@@ -27,6 +28,7 @@ static char *print_lv_text(int lv, int color){
     if(color) return log_text[lv].ctext;
     else return log_text[lv].text;
 }
+
 static char *print_time()
 {
     time_t now;
@@ -40,10 +42,19 @@ static char *print_time()
     snprintf(curr_time, 32, "%s %06ld",timebuf, (long)tv.tv_usec);
     return curr_time;
 }
+
+int log_set_level(int level)
+{
+    if(level < DEBUG || level > FATAL) return -1;
+    log_level = level;
+    return 0;
+}
+int log_set_opt(int opt);
+
 static int log_open_file()
 {
     log_fp = fopen(log_file_name, "w");
-    LOG(LOG_INFO, "Log file save to %s\n", log_file_name);
+    LOG(INFO, "Log file save to %s\n", log_file_name);
     return 0;
 }
 
@@ -72,6 +83,7 @@ void log_print(int level, char *file, int line, char *fmt, ...)
     vsnprintf(buf, sizeof(buf),fmt, vl);
     va_end(vl);
     if(log2screen){
+		if(level < log_level) return;
 #ifdef COLOR_LOG
         fprintf(stderr, "%16s| %s ( %s:%d ) %s", print_lv_text(level, 1), print_time(), file, line, buf);
         fprintf(stderr, "\033[0m");
@@ -80,6 +92,7 @@ void log_print(int level, char *file, int line, char *fmt, ...)
 #endif
     }
     if(log2file && log_fp){
+		if(level < log_level) return;
         fprintf(log_fp, "%s %s ( %s:%d ) %s", print_lv_text(level, 0), print_time(), file, line, buf);
     }
 }

log.h

@@ -1,14 +1,25 @@
 #ifndef __LOG_H
 #define __LOG_H
 
-#define LOG_FATAL   4
-#define LOG_ERROR   3
-#define LOG_WARN    2
-#define LOG_INFO    1
-#define LOG_DEBUG   0
+#define FATAL   4
+#define ERROR   3
+#define WARN    2
+#define INFO    1
+#define DEBUG   0
 void log_print(int level, char *file, int line, char *fmt, ...);
 #define LOG(level, fmt, args...) log_print(level, __FILE__,__LINE__, fmt, ##args)
 
+#define LOG_DEBUG(fmt, args...) log_print(DEBUG, __FILE__,__LINE__, fmt, ##args)
+#define LOG_INFO(fmt, args...) log_print(INFO, __FILE__,__LINE__, fmt, ##args)
+#define LOG_WARN(fmt, args...) log_print(WARN, __FILE__,__LINE__, fmt, ##args)
+#define LOG_ERROR(fmt, args...) log_print(ERROR, __FILE__,__LINE__, fmt, ##args)
+#define LOG_FATAL(fmt, args...) log_print(FATAL, __FILE__,__LINE__, fmt, ##args)
+
+
 int log_set_file(char *file);
 int log_close_file();
+
+int	log_set_level(int level);
+int	log_set_opt(int opt);
+
 #endif

test.c

@@ -2,12 +2,29 @@
 #include "log.h"
 int main()
 {
+    //Set log file to /tmp/a.log
     log_set_file("/tmp/a.log");
-    LOG(LOG_DEBUG, "line1\n");
-    LOG(LOG_INFO, "line2\n");
-    LOG(LOG_WARN, "line3\n");
-    LOG(LOG_ERROR, "line4\n");
-    LOG(LOG_FATAL, "line5\n");
+    LOG(DEBUG, "line1\n");
+    LOG(INFO, "line2\n");
+    LOG(WARN, "line3\n");
+    LOG(ERROR, "line4\n");
+    LOG(FATAL, "line5\n");
+
+    //use another method log
+    LOG_DEBUG("line1\n");
+    LOG_INFO("line2\n");
+    LOG_WARN("line3\n");
+    LOG_ERROR("line4\n");
+    LOG_FATAL("line5\n");
+
+    //set log level to warning
+    log_set_level(WARN);
+    LOG_DEBUG("line1\n");
+    LOG_INFO("line2\n");
+    LOG_WARN("line3\n");
+    LOG_ERROR("line4\n");
+    LOG_FATAL("line5\n");
+
     log_close_file();
     return 0;
 }