c将字符串拆分，并存入结构体

函数功能

字符串格式：type=0&u=user1&p=pass1
结构体格式：

typedef struct{
	unsigned int    len;
	char            *data;
}STRING_S;

最终将0、user1、pass1存入到结构体STRING_S中

代码实现

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define SUCCESS 0
#define FAILED -1

/*该枚举主要为了说明字符串有几组数据，便于最后打印使用：该例子总有type、name、pass三组数据*/
typedef enum en_GetAuthInfoPos
{
	GETAUTHINFOPOS_TYPE = 0,
	GETAUTHINFOPOS_NAME,
	GETAUTHINFOPOS_PWD,
	GETAUTHINFOPOS_MAX,
}GETAUTHINFOPOS_TYPE_E;

/*该结构体用于存放字符串的值：data存数据起始位置，len存数据长度（例如该例子中name字段的data是user1&p=pass1，name字段的len是5）*/
typedef struct{
	unsigned int    len;
	char            *data;
}STRING_S;

int String_parseDataFromClient(char *pcDataFromClient, int iLen, STRING_S *pastrAuthInfo)
{
	int i = 0;
	int j = 0;
	char *pcPos = NULL;
	
	for(i = 0, pcPos = pcDataFromClient; i <= iLen; i++)
	{
		if('=' == pcPos[i])
		{
			pastrAuthInfo[j].data = &pcPos[i] + 1;
		}

		if(('&' == pcPos[i]) || (i == iLen))
		{
			pastrAuthInfo[j].len = &pcPos[i] - pastrAuthInfo[j].data;
			j++;
		}
	}

	return SUCCESS;
}

int main(int argc, char **argv)
{
	int iLen = 0;
	char *pcDataFromClient = "type=0&u=user1&p=pass1";
	
	STRING_S astrAuthInfo[GETAUTHINFOPOS_MAX] = {{0}};
	
	printf("%s\n\n", pcDataFromClient);

	iLen = strlen(pcDataFromClient);

	if(SUCCESS != String_parseDataFromClient(pcDataFromClient, iLen, astrAuthInfo))
	{
		printf("String_parseDataFromClient()  error !\n");
		return FAILED;
	}

	int j = 0;
	for(j; j < GETAUTHINFOPOS_MAX; j++)
	{
		printf("astrAuthInfo[%d].data=%s astrAuthInfo[%d].len=%d\n", j, astrAuthInfo[j].data, j, astrAuthInfo[j].len);
	}
	return 0;
}

结果显示

[root@localhost svn]# ./chaifen_zifuchaun
type=0&u=user1&p=pass1

astrAuthInfo[0].data=0&u=user1&p=pass1 astrAuthInfo[0].len=1
astrAuthInfo[1].data=user1&p=pass1     astrAuthInfo[1].len=5
astrAuthInfo[2].data=pass1             astrAuthInfo[2].len=5