C标准库没提供的助手函数：字符串替换
/**************** (C) COPYRIGHT 2015 Gizwits ******************** @file : strrpl.c
* @author : William Yip
* @date : 18 Dec 2015
* @version : 1.0
* @brief : 连接、增值、开放、中立、安全、自有、自由、生态
******************************************************
* History:
******************************************************
THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A
RESULT, GIZWITS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR
CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF
SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*****************************************************/
#include "strrpl.h"
#ifdef GIZWITS_STRRPL_EXAMPLE
void main()
{
char * json = "{\"data\":[{\"product_key\":\"14ea605e1b7b43228494400e340fc7bb\",\"device_sn\":\"accf23796032\",\"uid\":\"3b2a09ea7a14430ba7938ddb93140a2e\",\"ts\":1450349681,\"attrs\":{\"Down\":false,\"Right\":false,\"speed\":\"0\",\"Up\":false,\"Left\":false}}]}";
char * token = "\"";
char * replacement = "\\\"";
char * result = strrpl(json, token, replacement);
printf("\n%s\n\n", result);
free(result);
}
#endif // GIZWITS_STRRPL_EXAMPLE
char * strrpl(const char * str, const char * token, const char * replacement)
{
int lenToken = strlen(token);
int lenReplacement = strlen(replacement);
int lenResult = 0;
char * begin = NULL;
char * end = NULL;
int count = 0;
char * output = NULL;
char * tmp = NULL;
int len = 0;
int i = 0;
// 输入检查：防止参数空指针
if (!str || !token || !replacement)
{
fprintf(stderr, "%s(), NULL parameter is not allowed", __func__);
return NULL;
}
// 先搜一遍：找有多少个可替换先
end = begin = (char *) str;
count = 0;
for ( end = strstr(str, "\"");
NULL != end;
end = strstr(begin, "\"") )
{
count++;
begin = end + lenToken;
}
// 预分配替换后的目标字符串缓冲
lenResult = strlen(str) + count * (lenReplacement - lenToken) + 1;
output = malloc(lenResult);
// 真正进行替换
end = begin = (char *) str;
tmp = output;
for ( end = strstr(str, "\"");
NULL != end;
end = strstr(begin, "\"") )
{
len = end - begin;
memcpy(tmp, begin, len); tmp += len;
// 目标字符串，游标移位
for (i=0; i<lenReplacement; i++)
{
*tmp = replacement;
tmp++;
}
// 源字符串，游标移位
begin = end + lenToken;
}
// 最后一个替换后剩余的结尾（或者没有替换可进行时，就直接拷贝整个源字符串）
len = strlen(str) - (begin - str);
if (len > 0)
memcpy(tmp, begin, len);
// 目标字符串加终止符，确保不越界
output = '\0';
return output;
}
/*********** (C) COPYRIGHT 2015 Gizwits *************
* @file : strrpl.h
* @author : William Yip
* @date : 18 Dec 2015
* @version : 1.0
* @brief : 连接、增值、开放、中立、安全、自有、自由、生态
************************************
* History:
************************************
THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A
RESULT, GIZWITS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR
CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF
SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
************************************/
#ifndef _GIZWITS_STRRPL_H_
#define _GIZWITS_STRRPL_H_
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
// #define GIZWITS_STRRPL_EXAMPLE
/**
* @desc C助手函数，字符串替换
* @param str 源字符串
* @param token 将被替换的内容
* @param replacement 要替换成的新内容
* @memo 如果想运行示例，打开GIZWITS_STRRPL_EXAMPLE预定义开关进行编译，具体示例代码在main() @ strrpl.cpp中
*/
char * strrpl(const char * str, const char * token, const char * replacement);
#endif // _GIZWITS_STRRPL_H_
看上去很不错哦～
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