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msglog.c
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msglog.c
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/*
* COPYRIGHT (C) 2014 - 2020, piggy_xrh
*
* msglog is a simple log library.
*
* If you have any troubles or questions on using the library, contact me.
*
* (Email: piggy_xrh@163.com QQ: 1169732280)
*/
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include "msglog.h"
#ifdef _WIN
#define inline __inline
// MSVC++ 14.0 (Visual Studio 2015)
#if(_MSC_VER < 1900)
#define snprintf _snprintf
#endif
#endif
#define C_NONE "\033[m"
#define C_RED "\033[0;32;31m"
#define C_LRED "\033[1;31m"
#define C_GREEN "\033[0;32;32m"
#define C_LGREEN "\033[1;32m"
#define C_BLUE "\033[0;32;34m"
#define C_LBLUE "\033[1;34m"
#define C_GRAY "\033[1;30m"
#define C_LGRAY "\033[0;37m"
#define C_CYAN "\033[0;36m"
#define C_LCYAN "\033[1;36m"
#define C_PURPLE "\033[0;35m"
#define C_LPURPLE "\033[1;35m"
#define C_BROWN "\033[0;33m"
#define C_LBROWN "\033[1;33m"
#define C_YELLOW "\033[1;33m"
#define C_WHITE "\033[1;37m"
typedef struct log_oattr {
const char *ldesc_start;
const char *ldesc;
const char *ldesc_end;
const char *textc_start;
const char *textc_end;
} log_oattr_t;
static log_oattr_t ___log_oattr[] = {
{"", "", "", "", ""},
{C_BROWN"["C_GRAY , "TRACE" , C_BROWN"]", C_GRAY , C_NONE},
{C_BROWN"["C_LPURPLE, "DEBUG" , C_BROWN"]", C_LPURPLE, C_NONE},
{C_BROWN"["C_GREEN , "INFO " , C_BROWN"]", C_GREEN , C_NONE},
{C_BROWN"["C_YELLOW , "WARN " , C_BROWN"]", C_YELLOW , C_NONE},
{C_BROWN"["C_RED , "ERROR" , C_BROWN"]", C_RED , C_NONE}
};
static int ___log_color_enabled =
/** Windows can not translate the color attributes well */
#ifdef _WIN
0;
#else
1;
#endif
static int ___log_level =
#ifndef NDEBUG
LOG_TRACE;
#else
LOG_WARN;
#endif
static msg_log_handler_t *___log_msgh = NULL;
#define MAX_LOG_FILTER_ENTRY 200
static const char *___log_filter_mentry[MAX_LOG_FILTER_ENTRY];
static int ___log_filter_lentry[MAX_LOG_FILTER_ENTRY];
static int ___log_entry_idx = 0;
static enum eFilterType ___log_et = eFT_discard;
static inline const char *
MSG_log_buffer2(char *buff, int bufflen, msg_log_brief_t *mlm, const char *omsg)
{
if (!mlm->m)
mlm->m = " ***** ";
if (___log_color_enabled)
snprintf(buff, bufflen,
"%s%-9s%s %s%s%s %s%s%s",
___log_oattr[mlm->level].ldesc_start,
mlm->m,
___log_oattr[mlm->level].ldesc_end,
___log_oattr[mlm->level].ldesc_start,
___log_oattr[mlm->level].ldesc,
___log_oattr[mlm->level].ldesc_end,
___log_oattr[mlm->level].textc_start,
omsg,
___log_oattr[mlm->level].textc_end);
else
snprintf(buff, bufflen,
"[%-9s] [%s] %s",
mlm->m,
___log_oattr[mlm->level].ldesc,
omsg);
return buff;
}
EXPORT const char *
MSG_log_version()
{
return "2015/09/15-1.2-libmsglog-mfilter";
}
EXPORT void
MSG_log_set_level(int level)
{
___log_level = level;
}
EXPORT int
MSG_log_get_level()
{
return ___log_level;
}
EXPORT void
MSG_log_enable_color(int enable)
{
___log_color_enabled = enable;
}
EXPORT void
MSG_log_set_handler(msg_log_handler_t *msgh)
{
___log_msgh = msgh;
}
EXPORT void
MSG_log_mfilter_set_type(enum eFilterType et)
{
___log_et = et;
}
EXPORT void
MSG_log_mfilter_add(const char *m, int level)
{
int idx;
if (!m || ___log_entry_idx == MAX_LOG_FILTER_ENTRY)
return;
for (idx=0; idx<___log_entry_idx; idx++)
if (!strcmp(___log_filter_mentry[idx], m)) {
___log_filter_lentry[idx] = level;
return;
}
___log_filter_mentry[___log_entry_idx] = m;
___log_filter_lentry[___log_entry_idx] = level;
++ ___log_entry_idx;
}
EXPORT void
MSG_log_mfilter_add_entry(const char **mentry, int *lentry)
{
if (mentry) {
do {
MSG_log_mfilter_add(*mentry, lentry ? (*lentry ++) : ___log_level);
} while (*(++ mentry));
}
}
EXPORT
void MSG_log_mfilter_set_entry(const char **mentry, int *lentry)
{
___log_entry_idx = 0;
if (mentry)
MSG_log_mfilter_add_entry(mentry, lentry);
}
EXPORT void
MSG_log_mfilter_remove(const char *m)
{
int idx;
if (!m || !___log_entry_idx)
return;
for (idx=0; idx<___log_entry_idx; idx++) {
if (!strcmp(___log_filter_mentry[idx], m)) {
if (idx != ___log_entry_idx - 1) {
memmove((void *)(___log_filter_mentry + idx), (const void *)(___log_filter_mentry + idx + 1),
___log_entry_idx - idx -1);
memmove(___log_filter_lentry + idx, ___log_filter_lentry + idx + 1,
___log_entry_idx - idx -1);
}
-- ___log_entry_idx;
}
}
}
EXPORT void
MSG_log_mfilter_remove_entry(const char **mentry)
{
if (mentry) {
do {
MSG_log_mfilter_remove(*mentry);
} while (*(++ mentry));
}
}
static inline int
___log_discard(const char *m, int level)
{
int idx;
if (!___log_entry_idx || !m)
return ___log_et == eFT_allow;
for (idx=0; idx<___log_entry_idx; idx++)
if (!strcmp(___log_filter_mentry[idx], m)) {
if (level < ___log_filter_lentry[idx])
return 1;
if (level == ___log_filter_lentry[idx])
return ___log_et == eFT_discard;
return 0;
}
return ___log_et == eFT_allow;
}
EXPORT int
MSG_log_should_be_discarded(msg_log_brief_t *const mlm)
{
return mlm->level < ___log_level || ___log_discard(mlm->m, mlm->level);
}
EXPORT const char *
MSG_log_buffer(char *buff, int bufflen, msg_log_brief_t *mlm, const char *omsg)
{
return MSG_log_buffer2(buff, bufflen, mlm, omsg);
}
EXPORT void
MSG_log(const char *m, int level, const char *fmt, ...)
{
int n;
char msg[1000], omsg[1100];
va_list ap;
assert (m);
assert (level >= LOG_TRACE && level <= LOG_ERR);
/**
* Before formating the message , we give a chance to
* the message handler to filt the log messages
*/
if (___log_msgh && ___log_msgh->log_filter) {
msg_log_brief_t mlm = {m, level};
if ((*___log_msgh->log_filter)(___log_msgh, &mlm))
return;
/**
* If there is none message filter, then we check the
* global configuration to determine whether we should
* discard this message or not
*/
} else if (level < ___log_level || ___log_discard(m, level))
return;
/**
* Format the message
*/
va_start(ap, fmt);
n = vsnprintf(msg, sizeof(msg), fmt, ap);
va_end(ap);
if(!(n > -1 && n < sizeof(msg)))
return;
/**
* If there is a message handler, we just deliver the message
* to the handler directly
*/
if (___log_msgh && ___log_msgh->log_handler) {
msg_log_brief_t mlm = {m, level};
(*___log_msgh->log_handler)(___log_msgh, &mlm, msg);
return;
}
/**
* Format the message with the global configurations
*/
{
msg_log_brief_t mlm = {m, level};
MSG_log_buffer2(omsg, sizeof(omsg), &mlm, msg);
}
/**
* If it goes here, we just output the message to the console
*/
fputs(
omsg,
level < LOG_WARN ? stdout : stderr
);
}