深度文章，高手必看：C编程表驱动法编程实践（精华帖，建议收藏并实践）
时间：2020-04-27 09:59:04
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[导读]直接来源 ：公众号【嵌入式云IOT技术圈】，作者：杨源鑫 数据压倒一切。如果选择了正确的数据结构并把一切组织的井井有条，正确的算法就不言自明。编程的核心是数据结构，而不是算法。 ——Rob Pike 说明 本文基于这样的认识：数据是易变的，逻辑是稳定的。
说明
1 概念提出
if(ucNum < 10)
{
ucNumChar = ConvertToChar(ucNum);
}
else if(ucNum == 10)
{
ucNumChar = 'A';
}
else if(ucNum == 11)
{
ucNumChar = 'B';
}
else if(ucNum == 12)
{
ucNumChar = 'C';
}
//... ...
else if(ucNum == 35)
{
ucNumChar = 'Z';
}
CHAR aNumChars[] = {'0', '1', '2', /*3~9*/'A', 'B', 'C', /*D~Y*/'Z'};
CHAR ucNumChar = aNumChars[ucNum % sizeof(aNumChars)];
CHAR ucNumChar = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[ucNum];
1.1 查表方式
1.1.1 直接查找
if(0 == ucDay)
{
pszDayName = "Sunday";
}
else if(1 == ucDay)
{
pszDayName = "Monday";
}
//... ...
else if(6 == ucDay)
{
pszDayName = "Saturday";
}
CHAR *paNumChars[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
CHAR *pszDayName = paNumChars[ucDay];
1.1.2 索引查找
1.1.3 分段查找
#define MAX_GRADE_LEVEL (INT8U)5
DOUBLE aRangeLimit[MAX_GRADE_LEVEL] = {50.0, 60.0, 70.0, 80.0, 100.0};
CHAR *paGrades[MAX_GRADE_LEVEL] = {"Fail", "Pass", "Credit", "Distinction", "High Distinction"};
static CHAR* EvaluateGrade(DOUBLE dScore)
{
INT8U ucLevel = 0;
for(; ucLevel < MAX_GRADE_LEVEL; ucLevel++)
{
if(dScore < aRangeLimit[ucLevel])
return paGrades[ucLevel];
}
return paGrades[0];
}
typedef struct{
DOUBLE aRangeLimit;
CHAR *pszGrade;
}T_GRADE_MAP;
T_GRADE_MAP gGradeMap[MAX_GRADE_LEVEL] = {
{50.0, "Fail"},
{60.0, "Pass"},
{70.0, "Credit"},
{80.0, "Distinction"},
{100.0, "High Distinction"}
};
static CHAR* EvaluateGrade(DOUBLE dScore)
{
INT8U ucLevel = 0;
for(; ucLevel < MAX_GRADE_LEVEL; ucLevel++)
{
if(dScore < gGradeMap[ucLevel].aRangeLimit)
return gGradeMap[ucLevel].pszGrade;
}
return gGradeMap[0].pszGrade;
}
1.2 实战示例
1.2.1 字符统计
INT32U aDigitCharNum[10] = {0}; /* 输入字符串中各数字字符出现的次数 */
INT32U dwStrLen = strlen(szDigits);
INT32U dwStrIdx = 0;
for(; dwStrIdx < dwStrLen; dwStrIdx++)
{
switch(szDigits[dwStrIdx])
{
case '1':
aDigitCharNum[0]++;
break;
case '2':
aDigitCharNum[1]++;
break;
//... ...
case '9':
aDigitCharNum[8]++;
break;
}
}
for(; dwStrIdx < dwStrLen; dwStrIdx++)
{
aDigitCharNum[szDigits[dwStrIdx] - '0']++;
}
1.2.2 月天校验
switch(OnuTime.Month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
if(OnuTime.Day>31 || OnuTime.Day<1)
{
CtcOamLog(FUNCTION_Pon,"Don't support this Day: %d(1~31)!!!\n", OnuTime.Day);
retcode = S_ERROR;
}
break;
case 2:
if(((OnuTime.Year%4 == 0) && (OnuTime.Year%100 != 0)) || (OnuTime.Year%400 == 0))
{
if(OnuTime.Day>29 || OnuTime.Day<1)
{
CtcOamLog(FUNCTION_Pon,"Don't support this Day: %d(1~29)!!!\n", OnuTime.Day);
retcode = S_ERROR;
}
}
else
{
if(OnuTime.Day>28 || OnuTime.Day<1)
{
CtcOamLog(FUNCTION_Pon,"Don't support this Day: %d(1~28)!!!\n", OnuTime.Day);
retcode = S_ERROR;
}
}
break;
case 4:
case 6:
case 9:
case 11:
if(OnuTime.Day>30 || OnuTime.Day<1)
{
CtcOamLog(FUNCTION_Pon,"Don't support this Day: %d(1~30)!!!\n", OnuTime.Day);
retcode = S_ERROR;
}
break;
default:
CtcOamLog(FUNCTION_Pon,"Don't support this Month: %d(1~12)!!!\n", OnuTime.Month);
retcode = S_ERROR;
break;
}
#define MONTH_OF_YEAR 12 /* 一年中的月份数 */
/* 闰年：能被4整除且不能被100整除，或能被400整除 */
#define IS_LEAP_YEAR(year) ((((year) % 4 == 0) && ((year) % 100 != 0)) || ((year) % 400 == 0))
/* 平年中的各月天数，下标对应月份 */
INT8U aDayOfCommonMonth[MONTH_OF_YEAR] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
INT8U ucMaxDay = 0;
if((OnuTime.Month == 2) && (IS_LEAP_YEAR(OnuTime.Year)))
ucMaxDay = aDayOfCommonMonth[1] + 1;
else
ucMaxDay = aDayOfCommonMonth[OnuTime.Month-1];
if((OnuTime.Day < 1) || (OnuTime.Day > ucMaxDay)
{
CtcOamLog(FUNCTION_Pon,"Month %d doesn't have this Day: %d(1~%d)!!!\n",
OnuTime.Month, OnuTime.Day, ucMaxDay);
retcode = S_ERROR;
}
1.2.3 名称构造
void Sub_SetServerType(INT8U *ServerType, INT16U wan_servertype)
{
if ((wan_servertype & 0x0001) == 0x0001)
{
strcat(ServerType, "_INTERNET");
}
if ((wan_servertype & 0x0002) == 0x0002)
{
strcat(ServerType, "_TR069");
}
if ((wan_servertype & 0x0004) == 0x0004)
{
strcat(ServerType, "_VOIP");
}
if ((wan_servertype & 0x0008) == 0x0008)
{
strcat(ServerType, "_OTHER");
}
}
/* 获取var变量第bit位，编号从右至左 */
#define GET_BIT(var, bit) (((var) >> (bit)) & 0x1)
const CHAR* paSvrNames[] = {"_INTERNET", "_TR069", "_VOIP", "_OTHER"};
const INT8U ucSvrNameNum = sizeof(paSvrNames) / sizeof(paSvrNames[0]);
VOID SetServerType(CHAR *pszSvrType, INT16U wSvrType)
{
INT8U ucIdx = 0;
for(; ucIdx < ucSvrNameNum; ucIdx++)
{
if(1 == GET_BIT(wSvrType, ucIdx))
strcat(pszSvrType, paSvrNames[ucIdx]);
}
}
1.2.4 值名解析
//值名映射表结构体定义，用于数值解析器
typedef struct{
INT32U dwElem; //待解析数值，通常为枚举变量
CHAR* pszName; //指向数值所对应解析名字符串的指针
}T_NAME_PARSER;
/******************************************************************************
* 函数名称: NameParser
* 功能说明: 数值解析器，将给定数值转换为对应的具名字符串
* 输入参数: VOID *pvMap :值名映射表数组，含T_NAME_PARSER结构体类型元素
VOID指针允许用户在保持成员数目和类型不变的前提下，
定制更有意义的结构体名和/或成员名。
INT32U dwEntryNum :值名映射表数组条目数
INT32U dwElem :待解析数值，通常为枚举变量
INT8U* pszDefName :缺省具名字符串指针，可为空
* 输出参数: NA
* 返回值 : INT8U *: 数值所对应的具名字符串
当无法解析给定数值时，若pszDefName为空，则返回数值对应的16进制格式
字符串；否则返回pszDefName。
******************************************************************************/
INT8U *NameParser(VOID *pvMap, INT32U dwEntryNum, INT32U dwElem, INT8U* pszDefName)
{
CHECK_SINGLE_POINTER(pvMap, "NullPoniter");
INT32U dwEntryIdx = 0;
for(dwEntryIdx = 0; dwEntryIdx < dwEntryNum; dwEntryIdx++)
{
T_NAME_PARSER *ptNameParser = (T_NAME_PARSER *)pvMap;
if(dwElem == ptNameParser->dwElem)
{
return ptNameParser->pszName;
}
//ANSI标准禁止对void指针进行算法操作；GNU标准则指定void*算法操作与char*一致。
//若考虑移植性，可将pvMap类型改为INT8U*，或定义INT8U*局部变量指向pvMap。
pvMap += sizeof(T_NAME_PARSER);
}
if(NULL != pszDefName)
{
return pszDefName;
}
else
{
static INT8U szName[12] = {0}; //Max:"0xFFFFFFFF"
sprintf(szName, "0x%X", dwElem);
return szName;
}
}
//UNI端口类型值名映射表结构体定义
typedef struct{
INT32U dwPortType;
INT8U* pszPortName;
}T_PORT_NAME;
//UNI端口类型解析器
T_PORT_NAME gUniNameMap[] = {
{1, "Fe"},
{3, "Pots"},
{99, "Vuni"}
};
const INT32U UNI_NAM_MAP_NUM = (INT32U)(sizeof(gUniNameMap)/sizeof(T_PORT_NAME));
VOID NameParserTest(VOID)
{
INT8U ucTestIndex = 1;
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("Unknown", NameParser(gUniNameMap, UNI_NAM_MAP_NUM, 0, "Unknown")) ? "ERROR" : "OK");
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("DefName", NameParser(gUniNameMap, UNI_NAM_MAP_NUM, 0, "DefName")) ? "ERROR" : "OK");
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("Fe", NameParser(gUniNameMap, UNI_NAM_MAP_NUM, 1, "Unknown")) ? "ERROR" : "OK");
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("Pots", NameParser(gUniNameMap, UNI_NAM_MAP_NUM, 3, "Unknown")) ? "ERROR" : "OK");
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("Vuni", NameParser(gUniNameMap, UNI_NAM_MAP_NUM, 99, NULL)) ? "ERROR" : "OK");
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("Unknown", NameParser(gUniNameMap, UNI_NAM_MAP_NUM, 255, "Unknown")) ? "ERROR" : "OK");
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("0xABCD", NameParser(gUniNameMap, UNI_NAM_MAP_NUM, 0xABCD, NULL)) ? "ERROR" : "OK");
printf("[%s]<Test Case %u> Result: %s!\n", __FUNCTION__, ucTestIndex++,
strcmp("NullPoniter", NameParser(NULL, UNI_NAM_MAP_NUM, 0xABCD, NULL)) ? "ERROR" : "OK");
}
1.2.5 取值映射
typedef struct{
PORTSTATE loopMEState;
PORTSTATE loopMIBState;
}LOOPMAPSTRUCT;
static LOOPMAPSTRUCT s_CesLoop[] = {
{NO_LOOP, e_ds1_looptype_noloop},
{PAYLOAD_LOOP, e_ds1_looptype_PayloadLoop},
{LINE_LOOP, e_ds1_looptype_LineLoop},
{PON_LOOP, e_ds1_looptype_OtherLoop},
{CES_LOOP, e_ds1_looptype_InwardLoop}};
PORTSTATE ConvertLoopMEStateToMIBState(PORTSTATE vPortState)
{
INT32U num = 0, ii;
num = ARRAY_NUM(s_CesLoop);
for(ii = 0; ii < num; ii++)
{
if(vPortState == s_CesLoop[ii].loopMEState)
return s_CesLoop[ii].loopMIBState;
}
return e_ds1_looptype_noloop;
}
/**********************************************************
* 功能描述：进行二维数组映射表的一对一映射，用于参数适配
* 参数说明：map -- 二维数组映射表
elemSrc -- 映射源，即待映射的元素值
elemDest -- 映射源对应的映射结果
direction -- 映射方向字节，表示从数组哪列映射至哪列。
高4位对应映射源列，低4位对应映射结果列。
defaultVal -- 映射失败时置映射结果为缺省值
* 示例：ARRAY_MAPPER(gCesLoopMap, 3, ucLoop, 0x10, NO_LOOP);
则ucLoop = 2(LINE_LOOP)
**********************************************************/
#define ARRAY_MAPPER(map, elemSrc, elemDest, direction, defaultVal) do{\
INT8U ucMapIdx = 0, ucMapNum = 0; \
ucMapNum = sizeof(map)/sizeof(map[0]); \
for(ucMapIdx = 0; ucMapIdx < ucMapNum; ucMapIdx++) \
{ \
if((elemSrc) == map[ucMapIdx][((direction)&0xF0)>>4]) \
{ \
elemDest = map[ucMapIdx][(direction)&0x0F]; \
break; \
} \
} \
if(ucMapIdx == ucMapNum) \
{ \
elemDest = (defaultVal); \
} \
}while(0)
static INT8U gCesLoopMap[][2] = {
{NO_LOOP, e_ds1_looptype_noloop},
{PAYLOAD_LOOP, e_ds1_looptype_PayloadLoop},
{LINE_LOOP, e_ds1_looptype_LineLoop},
{PON_LOOP, e_ds1_looptype_OtherLoop},
{CES_LOOP, e_ds1_looptype_InwardLoop}};
ARRAY_MAPPER(gCesLoopMap, tPara.dwParaVal[0], dwLoopConf, 0x01, e_ds1_looptype_noloop);
#define CES_DEFAULT_JITTERBUF (INT32U)2000 /* 默认jitterbuf为2000us，而1帧=125us */
#define CES_JITTERBUF_STEP (INT32U)125 /* jitterbuf步长为125us，即1帧 */
#define CES_DEFAULT_QUEUESIZE (INT32U)5
#define CES_DEFAULT_MAX_QUEUESIZE (INT32U)7
#define ARRAY_NUM(array) (sizeof(array) / sizeof((array)[0])) /* 数组元素个数 */
typedef struct{
INT32U dwJitterBuffer;
INT32U dwFramePerPkt;
INT32U dwQueueSize;
}QUEUE_SIZE_MAP;
/* gCesQueueSizeMap也可以(JitterBuffer / FramePerPkt)值为索引，更加紧凑 */
static QUEUE_SIZE_MAP gCesQueueSizeMap[]= {
{1,1,1}, {1,2,1}, {2,1,2}, {2,2,1},
{3,1,3}, {3,2,1}, {4,1,3}, {4,2,1},
{5,1,4}, {5,2,3}, {6,1,4}, {6,2,3},
{7,1,4}, {7,2,3}, {8,1,4}, {8,2,3},
{9,1,5}, {9,2,4}, {10,1,5}, {10,2,4},
{11,1,5}, {11,2,4}, {12,1,5}, {12,2,4},
{13,1,5}, {13,2,4}, {14,1,5}, {14,2,4},
{15,1,5}, {15,2,4}, {16,1,5}, {16,2,4},
{17,1,6}, {17,2,5}, {18,1,6}, {18,2,5},
{19,1,6}, {19,2,5}, {20,1,6}, {20,2,5},
{21,1,6}, {21,2,5}, {22,1,6}, {22,2,5},
{23,1,6}, {23,2,5}, {24,1,6}, {24,2,5},
{25,1,6}, {25,2,5}, {26,1,6}, {26,2,5},
{27,1,6}, {27,2,5}, {28,1,6}, {28,2,5},
{29,1,6}, {29,2,5}, {30,1,6}, {30,2,5},
{31,1,6}, {31,2,5}, {32,1,6}, {32,2,5}};
/**********************************************************
* 函数名称：CalcQueueSize
* 功能描述：根据JitterBuffer和FramePerPkt计算QueueSize
* 注意事项：配置的最大缓存深度
* = 2 * JitterBuffer / FramePerPkt
* = 2 * N Packet = 2 ^ QueueSize
* JitterBuffer为125us帧速率的倍数，
* FramePerPkt为每个分组的帧数，
* QueueSize向上取整，最大为7。
**********************************************************/
INT32U CalcQueueSize(INT32U dwJitterBuffer, INT32U dwFramePerPkt)
{
INT8U ucIdx = 0, ucNum = 0;
//本函数暂时仅考虑E1
ucNum = ARRAY_NUM(gCesQueueSizeMap);
for(ucIdx = 0; ucIdx < ucNum; ucIdx++)
{
if((dwJitterBuffer == gCesQueueSizeMap[ucIdx].dwJitterBuffer) &&
(dwFramePerPkt == gCesQueueSizeMap[ucIdx].dwFramePerPkt))
{
return gCesQueueSizeMap[ucIdx].dwQueueSize;
}
}
return CES_DEFAULT_MAX_QUEUESIZE;
}
1.2.6 版本控制
pstSendTlv->ucLength = 0x1f;
if (gOamCtrlCode == 0)
{
vosMemCpy(pstSendTlv->aucVersionList, ctc_oui, 3);
pstSendTlv->aucVersionList[3] = 0x30;
vosMemCpy(&(pstSendTlv->aucVersionList[4]), ctc_oui, 3);
pstSendTlv->aucVersionList[7] = 0x21;
vosMemCpy(&(pstSendTlv->aucVersionList[8]), ctc_oui, 3);
pstSendTlv->aucVersionList[11] = 0x20;
vosMemCpy(&(pstSendTlv->aucVersionList[12]), ctc_oui, 3);
pstSendTlv->aucVersionList[15] = 0x13;
vosMemCpy(&(pstSendTlv->aucVersionList[16]), ctc_oui, 3);
pstSendTlv->aucVersionList[19] = 0x01;
vosMemCpy(&(pstSendTlv->aucVersionList[20]), ctc_oui, 3);
pstSendTlv->aucVersionList[23] = 0xaa;
}
else if (gOamCtrlCode == 1)
{
vosMemCpy(pstSendTlv->aucVersionList, ctc_oui, 3);
pstSendTlv->aucVersionList[3] = 0x30;
vosMemCpy(&(pstSendTlv->aucVersionList[4]), ctc_oui, 3);
pstSendTlv->aucVersionList[7] = 0x21;
vosMemCpy(&(pstSendTlv->aucVersionList[8]), ctc_oui, 3);
pstSendTlv->aucVersionList[11] = 0x20;
vosMemCpy(&(pstSendTlv->aucVersionList[12]), ctc_oui, 3);
pstSendTlv->aucVersionList[15] = 0x13;
vosMemCpy(&(pstSendTlv->aucVersionList[16]), ctc_oui, 3);
pstSendTlv->aucVersionList[19] = 0x01;
}
//此处省略gOamCtrlCode == 2~6的处理代码
else if (gOamCtrlCode == 7)
{
vosMemCpy(&(pstSendTlv->aucVersionList), ctc_oui, 3);
pstSendTlv->aucVersionList[3] = 0x20;
vosMemCpy(&(pstSendTlv->aucVersionList[4]), ctc_oui, 3);
pstSendTlv->aucVersionList[7] = 0x13;
vosMemCpy(&(pstSendTlv->aucVersionList[8]), ctc_oui, 3);
pstSendTlv->aucVersionList[11] = 0x01;
}
/**********************************************************************
* 版本控制字数组定义
* gOamCtrlCode: Bitmap控制字。Bit-X为0时上报对应版本，Bit-X为1时屏蔽对应版本。
* CTRL_VERS_NUM: 可控版本个数。
* CTRL_CODE_NUM: 控制字个数。与CTRL_VERS_NUM有关。
* gOamVerCtrlMap: 版本控制字数组。行对应控制字，列对应可控版本。
元素值为0时不上报对应版本，元素值非0时上报该元素值。
* Note: 该数组旨在实现“数据与控制隔离”。后续若要新增可控版本，只需修改
-- CTRL_VERS_NUM
-- gOamVerCtrlMap新增行(控制字)
-- gOamVerCtrlMap新增列(可控版本)
**********************************************************************/
#define CTRL_VERS_NUM 3
#define CTRL_CODE_NUM (1<<CTRL_VERS_NUM)
u8_t gOamVerCtrlMap[CTRL_CODE_NUM][CTRL_VERS_NUM] = {
/* Ver21 Ver30 VerAA */
{0x21, 0x30, 0xaa}, /*gOamCtrlCode = 0*/
{0x21, 0x30, 0 }, /*gOamCtrlCode = 1*/
{0x21, 0, 0xaa}, /*gOamCtrlCode = 2*/
{0x21, 0, 0 }, /*gOamCtrlCode = 3*/
{ 0, 0x30, 0xaa}, /*gOamCtrlCode = 4*/
{ 0, 0x30, 0 }, /*gOamCtrlCode = 5*/
{ 0, 0, 0xaa}, /*gOamCtrlCode = 6*/
{ 0, 0, 0 } /*gOamCtrlCode = 7*/
};
#define INFO_TYPE_VERS_LEN 7 /* InfoType + Length + OUI + ExtSupport + Version */
u8_t verIdx = 0;
u8_t index = 0;
for(verIdx = 0; verIdx < CTRL_VERS_NUM; verIdx++)
{
if(gOamVerCtrlMap[gOamCtrlCode][verIdx] != 0)
{
vosMemCpy(&pstSendTlv->aucVersionList[index], ctc_oui, 3);
index += 3;
pstSendTlv->aucVersionList[index++] = gOamVerCtrlMap[gOamCtrlCode][verIdx];
}
}
vosMemCpy(&pstSendTlv->aucVersionList[index], ctc_oui, 3);
index += 3;
pstSendTlv->aucVersionList[index++] = 0x20;
vosMemCpy(&pstSendTlv->aucVersionList[index], ctc_oui, 3);
index += 3;
pstSendTlv->aucVersionList[index++] = 0x13;
vosMemCpy(&pstSendTlv->aucVersionList[index], ctc_oui, 3);
index += 3;
pstSendTlv->aucVersionList[index++] = 0x01;
pstSendTlv->ucLength = INFO_TYPE_VERS_LEN + index;
1.2.7 消息处理
void logall(void)
{
g_log_control[0] = 0xFFFFFFFF;
}
void noanylog(void)
{
g_log_control[0] = 0;
}
void logOam(void)
{
g_log_control[0] |= (0x01 << FUNCTION_Oam);
}
void nologOam(void)
{
g_log_control[0] &= ~(0x01 << FUNCTION_Oam);
}
//... ...
void logExec(char *name, INT8U enable)
{
CtcOamLog(FUNCTION_Oam,"log %s %d\n",name,enable);
if (enable == 1) /*log*/
{
if (strcasecmp(name,"all") == 0) { /*字符串比较，不区分大小写*/
logall();
} else if (strcasecmp(name,"oam") == 0) {
logOam();
} else if (strcasecmp(name,"pon") == 0) {
logPon();
//... ...
} else if (strcasecmp(name,"version") == 0) {
logVersion();
}
else if (enable == 0) /*nolog*/
{
if (strcasecmp(name,"all") == 0) {
noanylog();
} else if (strcasecmp(name,"oam") == 0) {
nologOam();
} else if (strcasecmp(name,"pon") == 0) {
nologPon();
//... ...
} else if (strcasecmp(name,"version") == 0) {
nologVersion();
}
else
{
printf("bad log para\n");
}
}
typedef struct{
OAM_LOG_OFF = (INT8U)0,
OAM_LOG_ON = (INT8U)1
}E_OAM_LOG_MODE;
typedef FUNC_STATUS (*OamLogHandler)(VOID);
typedef struct{
CHAR *pszLogCls; /* 打印级别 */
E_OAM_LOG_MODE eLogMode; /* 打印模式 */
OamLogHandler fnLogHandler; /* 打印函数 */
}T_OAM_LOG_MAP;
T_OAM_LOG_MAP gOamLogMap[] = {
{"all", OAM_LOG_OFF, noanylog},
{"oam", OAM_LOG_OFF, nologOam},
//... ...
{"version", OAM_LOG_OFF, nologVersion},
{"all", OAM_LOG_ON, logall},
{"oam", OAM_LOG_ON, logOam},
//... ...
{"version", OAM_LOG_ON, logVersion}
};
INT32U gOamLogMapNum = sizeof(gOamLogMap) / sizeof(T_OAM_LOG_MAP);
VOID logExec(CHAR *pszName, INT8U ucSwitch)
{
INT8U ucIdx = 0;
for(; ucIdx < gOamLogMapNum; ucIdx++)
{
if((ucSwitch == gOamLogMap[ucIdx].eLogMode) &&
(!strcasecmp(pszName, gOamLogMap[ucIdx].pszLogCls));
{
gOamLogMap[ucIdx].fnLogHandler();
return;
}
}
if(ucIdx == gOamLogMapNum)
{
printf("Unknown LogClass(%s) or LogMode(%d)!\n", pszName, ucSwitch);
return;
}
}
/* 日志控制类型定义 */
typedef enum
{
LOG_NORM = 0, /* 未分类日志，可用于通用日志 */
LOG_FRM, /* Frame，OMCI帧日志 */
LOG_PON, /* Pon，光链路相关日志 */
LOG_ETH, /* Ethernet，Layer2以太网日志 */
LOG_NET, /* Internet，Layer3网络日志 */
LOG_MULT, /* Multicast，组播日志 */
LOG_QOS, /* QOS，流量日志 */
LOG_CES, /* Ces，TDM电路仿真日志 */
LOG_VOIP, /* Voip，语音日志 */
LOG_ALM, /* Alarm，告警日志 */
LOG_PERF, /* Performance，性能统计日志 */
LOG_VER, /* Version，软件升级日志 */
LOG_XDSL, /* xDsl日志 */
LOG_DB, /* 数据库操作日志 */
//新日志类型在此处扩展，共支持32种日志类型
LOG_ALL = UINT_MAX /* 所有日志类型 */
}E_LOG_TYPE;
/*****************************************************************************
* 变量名称：gOmciLogCtrl
* 作用描述：OMCI日志控制字，BitMap格式(比特编号从LSB至MSB依次为Bit0->BitN)。
* Bit0~N分别对应E_LOG_TYPE各枚举值(除LOG_ALL外)。
* BitX为0时关闭日志类型对应的日志功能，BitX为1时则予以打开。
* 变量范围：该变量为四字节整型静态全局变量，即支持32种日志类型。
* 访问说明：通过GetOmciLogCtrl/SetOmciLogCtrl/OmciLogCtrl函数访问/设置控制字。
*****************************************************************************/
static INT32U gOmciLogCtrl = 0;
//日志类型字符串数组，下标为各字符串所对应的日志类型枚举值。
static const INT8U* paLogTypeName[] = {
"Norm", "Frame", "Pon", "Ethernet", "Internet",
"Multicast", "Qos", "Ces", "Voip", "Alarm",
"Performance", "Version", "Xdsl", "Db"
};
static const INT8U ucLogTypeNameNum = sizeof(paLogTypeName) / sizeof(paLogTypeName[0]);
static VOID SetGlobalLogCtrl(E_LOG_TYPE eLogType, INT8U ucLogSwitch)
{
if(LOG_ON == ucLogSwitch)
gOmciLogCtrl = LOG_ALL;
else
gOmciLogCtrl = 0;
}
static VOID SetSpecificLogCtrl(E_LOG_TYPE eLogType, INT8U ucLogSwitch)
{
if(LOG_ON == ucLogSwitch)
SET_BIT(gOmciLogCtrl, eLogType);
else
CLR_BIT(gOmciLogCtrl, eLogType);
}
VOID OmciLogCtrl(CHAR *pszLogType, INT8U ucLogSwitch)
{
if(0 == strncasecmp(pszLogType, "All", LOG_TYPE_CMP_LEN))
{
SetGlobalLogCtrl(LOG_ALL, ucLogSwitch);
return;
}
INT8U ucIdx = 0;
for(ucIdx = 0; ucIdx < ucLogTypeNameNum; ucIdx++)
{
if(0 == strncasecmp(pszLogType, paLogTypeName[ucIdx], LOG_TYPE_CMP_LEN))
{
SetSpecificLogCtrl(ucIdx, ucLogSwitch);
printf("LogType: %s, LogSwitch: %s\n", paLogTypeName[ucIdx],
(1==ucLogSwitch)?"On":"Off");
return;
}
}
OmciLogHelp();
}
1.2.8 掩码表
2 编程思想
分离原则：策略同机制分离，接口同引擎分离
表示原则：把知识叠入数据以求逻辑质朴而健壮
3 附录
3.1 网友观点
编程和人的关系
3.2 函数指针
int max(int x, int y) { return x>y?x:y; }
int min(int x, int y) { return x<y?x:y; }
int add(int x, int y) { return x+y; }
int process(int x, int y, int (*f)()) { return (*f)(x, y); }
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