int SetUpTCPtoSendInformation(char option[], char *command) { static char *TCPCommand; static int isTCPCommandSet = 0; if (strstr(option, "set")) { TCPCommand = malloc(strlen(command) + 1); if (TCPCommand == NULL) { CON_LOG("Failed to set and obtain TCP command variable memory allocation"); return 0; } strcpy(TCPCommand, command); isTCPCommandSet = 1; return 1; } else if (strstr(option, "get") && TCPCommand != NULL && strlen(TCPCommand) ) { strcpy(command, TCPCommand); memset(TCPCommand, '\0', strlen(TCPCommand)); isTCPCommandSet = 0; free(TCPCommand); return 1; } strcpy(command, ""); return 0; } char a[32] = "zhngsan"; SetUpTCPtoSendInformation("set",a); SetUpTCPtoSendInformation("get",a); printf("%s",a); SetUpTCPtoSendInformation("get",a); printf("%s",a);
时间: 2024-04-09 17:32:19 浏览: 18
这段代码是一个用于设置和获取TCP命令的函数。函数`SetUpTCPtoSendInformation`接受两个参数,`option`表示操作选项,`command`表示命令。根据`option`的不同值,函数会执行不同的操作。
如果`option`包含字符串"set",则将`command`的内容复制到`TCPCommand`变量中,并将`isTCPCommandSet`标志设置为1,表示TCP命令已设置。如果内存分配失败,则返回0。
如果`option`包含字符串"get",并且`TCPCommand`变量不为空且长度不为0,则将`TCPCommand`的内容复制到`command`中,并清空`TCPCommand`的内容,并释放内存。然后返回1。
如果以上条件都不满足,则将`command`的内容清空,并返回0。
接下来的代码示例中,首先将字符串"zhngsan"通过`SetUpTCPtoSendInformation("set",a)`设置为TCP命令。然后通过`SetUpTCPtoSendInformation("get",a)`获取TCP命令,并打印出来。最后再次调用`SetUpTCPtoSendInformation("get",a)`获取TCP命令,打印结果为空字符串。
注意:代码中存在一处拼写错误,将"zhngsan"改为"zhngsan"。
相关问题
int SetUpTCPtoSendInformation(char option[], char *command) { static char *TCPCommand; if (strstr(option, "set")) { TCPCommand = malloc(strlen(command) + 1); if (TCPCommand == NULL) { CON_LOG("Failed to set and obtain TCP command variable memory allocation"); return 0; } strcpy(TCPCommand, command); return 1; } else if (strstr(option, "get") && TCPCommand != NULL && strlen(TCPCommand) ) { strcpy(command, TCPCommand); memset(TCPCommand, '\0', strlen(TCPCommand)); isTCPCommandSet = 0; free(TCPCommand); return 1; } strcpy(command, ""); return 0; } char a[32] = "zhangsan"; SetUpTCPtoSendInformation("set",a); SetUpTCPtoSendInformation("get",a); printf("%s",a); SetUpTCPtoSendInformation("get",a); printf("%s",a);
这段代码修正了之前的错误,并且去掉了`isTCPCommandSet`变量,因为它没有被使用。下面是修正后的代码:
```c
int SetUpTCPtoSendInformation(char option[], char *command) {
static char *TCPCommand;
if (strstr(option, "set")) {
TCPCommand = malloc(strlen(command) + 1);
if (TCPCommand == NULL) {
CON_LOG("Failed to set and obtain TCP command variable memory allocation");
return 0;
}
strcpy(TCPCommand, command);
return 1;
} else if (strstr(option, "get") && TCPCommand != NULL && strlen(TCPCommand)) {
strcpy(command, TCPCommand);
memset(TCPCommand, '\0', strlen(TCPCommand));
free(TCPCommand);
return 1;
}
strcpy(command, "");
return 0;
}
char a[32] = "zhangsan";
SetUpTCPtoSendInformation("set", a);
SetUpTCPtoSendInformation("get", a);
printf("%s", a);
SetUpTCPtoSendInformation("get", a);
printf("%s", a);
```
这段代码的逻辑和之前的一样,首先通过`SetUpTCPtoSendInformation("set", a)`将字符串"zhangsan"设置为TCP命令。然后通过`SetUpTCPtoSendInformation("get", a)`获取TCP命令,并打印出来。最后再次调用`SetUpTCPtoSendInformation("get", a)`获取TCP命令,打印结果为空字符串。
int SetUpTCPtoSendInformation(char option[], char **command) { static int isFirstCall = 1; pthread_mutex_lock(&mutex); // 加锁 if (isFirstCall && strstr(option, "set")) { TCPCommand = malloc(strlen(*command) + 1); if (TCPCommand == NULL) { CON_LOG("Failed to set and obtain TCP command variable memory allocation"); goto fail; } strcpy(TCPCommand, *command); CON_LOG("set:%s", TCPCommand); isFirstCall = 0; goto succeed; } else if (!isFirstCall && strstr(option, "get") && TCPCommand != NULL && strlen(TCPCommand)) { free(*command); *command = malloc(strlen(TCPCommand) + 1); strcpy(*command, TCPCommand); CON_LOG("get:%s", *command); memset(TCPCommand, '\0', strlen(TCPCommand)); free(TCPCommand); isFirstCall = 1; goto succeed; } memset(*command, 0, sizeof(*command)); strcpy(*command, ""); fail: pthread_mutex_unlock(&mutex); // 解锁 return 0; succeed: pthread_mutex_unlock(&mutex); // 解锁 return 1; }SetUpTCPtoSendInformation("set","sssssss");char *resultbuf =NULL;SetUpTCPtoSendInformation("get",&resultbuf); 这样子调用多么如果不对请帮我修改
你调用函数的方式是正确的,但是在调用 `SetUpTCPtoSendInformation` 函数之前需要先声明和初始化 `mutex`。此外,在 `SetUpTCPtoSendInformation` 函数中存在一些问题。以下是修改后的代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
char* TCPCommand = NULL;
int SetUpTCPtoSendInformation(char option[], char **command) {
static int isFirstCall = 1;
pthread_mutex_lock(&mutex); // 加锁
if (isFirstCall && strstr(option, "set")) {
if (TCPCommand != NULL) {
free(TCPCommand);
}
TCPCommand = malloc(strlen(*command) + 1);
if (TCPCommand == NULL) {
printf("Failed to set and obtain TCP command variable memory allocation\n");
goto fail;
}
strcpy(TCPCommand, *command);
printf("set:%s\n", TCPCommand);
isFirstCall = 0;
goto succeed;
} else if (!isFirstCall && strstr(option, "get") && TCPCommand != NULL && strlen(TCPCommand)) {
free(*command);
*command = malloc(strlen(TCPCommand) + 1);
strcpy(*command, TCPCommand);
printf("get:%s\n", *command);
memset(TCPCommand, '\0', strlen(TCPCommand));
free(TCPCommand);
TCPCommand = NULL;
isFirstCall = 1;
goto succeed;
}
memset(*command, 0, sizeof(*command));
strcpy(*command, "");
fail:
pthread_mutex_unlock(&mutex); // 解锁
return 0;
succeed:
pthread_mutex_unlock(&mutex); // 解锁
return 1;
}
int main() {
char *resultbuf = NULL;
int success = SetUpTCPtoSendInformation("set", &resultbuf);
if (success) {
printf("SetUpTCPtoSendInformation set: %s\n", resultbuf);
} else {
printf("SetUpTCPtoSendInformation set failed\n");
}
SetUpTCPtoSendInformation("get", &resultbuf);
if (resultbuf != NULL) {
printf("SetUpTCPtoSendInformation get: %s\n", resultbuf);
free(resultbuf);
} else {
printf("SetUpTCPtoSendInformation get failed\n");
}
return 0;
}
```
这样修改后,函数的调用方式就是正确的了。它会先调用 `SetUpTCPtoSendInformation` 函数设置 `TCPCommand` 的值,然后再调用一次以获取 `TCPCommand` 的值并存储到 `resultbuf` 中。注意,当获取完 `TCPCommand` 的值后,需要手动释放 `resultbuf` 的内存。