C implementation log level control

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #include <stdarg.h>
 5 #include <time.h>
 6 
 7 #define SJXC_LOG_DEBUG(level, format, arg...)     SJXC_log_msg_print(level, __FILE__, __func__, __LINE__, format, ##arg)
 8 
 9 #ifdef SJXC_DISABLE_DEBUG
10 #define SJXC_REAL_DEBUG_LEVEL    0
11 #else
12 #define SJXC_REAL_DEBUG_LEVEL    SJXC_DEBUG_LEVEL
13 #endif
14 
15 #define SJXC_ERROR   (1 << 0)
16 #define SJXC_WARN    (1 << 1)
17 #define SJXC_INFO    (1 << 2)
18 #define SJXC_DEBUG   (1 << 3)
19 
20 int SJXC_DEBUG_LEVEL = 1;
21 
22 struct SJXC_gdb {
23     int level;
24     const char *msg;
25 };
26 
27 struct SJXC_gdb SJXC_gdb_table[] = { 
28     {SJXC_ERROR, "Config the log level as error."},
29     {SJXC_WARN, "Config the log level as warn."},
30     {SJXC_INFO, "Config the log level as info."},
31     {SJXC_DEBUG, "Config the log level as DEBUG."}
32 };
33 
34 void SJXC_print_debuf_usage(void)
35 {
36     struct SJXC_gdb *p_gdb;
37     fprintf(stderr, 
38             "    To calculate the debug level, logically 'or'\n"
39             "    some of the following values together to get a bebug level:\n");
40     for (p_gdb = SJXC_gdb_table; p_gdb < SJXC_gdb_table + (sizeof(SJXC_gdb_table) / sizeof(struct SJXC_gdb)); p_gdb++) {
41         fprintf(stderr, "\t%d:\t%s\n", p_gdb->level, p_gdb->msg);
42     }   
43     fprintf(stderr, "\n");
44 }
45 
46 void SJXC_log_msg_print(int level, const char *file, const char *func, const int line, char *fmt, ...)
47 {   
48     char *status;
49     
50     switch (level) {
51         case SJXC_ERROR:
52             status = "ERROR";
53             break;
54         case SJXC_WARN:
55             status = "WRAN";
56             break;
57         case SJXC_INFO:
58             status = "INFO";
59             break;
60         case SJXC_DEBUG:
61             status = "DEBUG";
62             break;
63         default:
64             printf("Debug message level ERROR!\n");
65     }
66     
67     if (SJXC_REAL_DEBUG_LEVEL & level) {
68         char msg_buf[20*1024];
69         char *ascii_time_buf;
70         time_t tnow = time(NULL);
71         va_list ap;
72         
73         ascii_time_buf = asctime(localtime(&tnow));
74         ascii_time_buf[strlen(ascii_time_buf) - 1] = '\0';
75         
76         va_start(ap, fmt);
77         sprintf(msg_buf, "    ------> [ %s %s:%s:%d ] %s ", ascii_time_buf, file, func, line, status);
78         vsprintf(msg_buf + strlen(msg_buf), fmt, ap);
79         fprintf(stderr, "%s\n", msg_buf);
80         va_end(ap);
81     }
82 }
83 
84 #if 1
85 int main(void)
86 {
87     int i = 0;
88     printf("%d\n", SJXC_REAL_DEBUG_LEVEL);
89     SJXC_print_debuf_usage();
90     while( i != 32) {
91         SJXC_log_msg_print(SJXC_ERROR, __FILE__, __func__, __LINE__, "1234567890");
92         i++;
93     }
94 　　return 0;
95 }
96 #endif