C标准库没提供的助手函数：字符串替换

风扬蛮子

1. /**************** (C) COPYRIGHT 2015 Gizwits *******************
   
2. * @file              : strrpl.c
   
3. * @author            : William Yip
   
4. * @date              : 18 Dec 2015
   
5. * @version           : 1.0
   
6. * @brief             : 连接、增值、开放、中立、安全、自有、自由、生态
   
7. ******************************************************
   
8. * History:
   
9. ******************************************************
   
10. THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
    
11. CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A
    
12. RESULT, GIZWITS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR
    
13. CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF
    
14. SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
    
15. CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
    
16. *****************************************************/
    
17. 
    
18. #include "strrpl.h"
    
19. 
    
20. #ifdef GIZWITS_STRRPL_EXAMPLE
    
21. void main()
    
22. {
    
23.         char * json = "{\"data\":[{\"product_key\":\"14ea605e1b7b43228494400e340fc7bb\",\"device_sn\":\"accf23796032\",\"uid\":\"3b2a09ea7a14430ba7938ddb93140a2e\",\"ts\":1450349681,\"attrs\":{\"Down\":false,\"Right\":false,\"speed\":\"0\",\"Up\":false,\"Left\":false}}]}";
    
24.         char * token = "\"";
    
25.         char * replacement = "\\\"";
    
26.         char * result = strrpl(json, token, replacement);
    
27.         printf("\n%s\n\n", result);
    
28.         free(result);
    
29. }
    
30. #endif // GIZWITS_STRRPL_EXAMPLE
    
31. 
    
32. char * strrpl(const char * str, const char * token, const char * replacement)
    
33. {
    
34.         int lenToken = strlen(token);
    
35.         int lenReplacement = strlen(replacement);
    
36.         int lenResult = 0;
    
37. 
    
38.         char * begin = NULL;
    
39.         char * end = NULL;
    
40.         int count = 0;
    
41. 
    
42.         char * output = NULL;
    
43.         char * tmp = NULL;
    
44.         int len = 0;
    
45. 
    
46.         int i = 0;
    
47. 
    
48.         // 输入检查：防止参数空指针
    
49.         if (!str || !token || !replacement)
    
50.         {
    
51.                 fprintf(stderr, "%s(), NULL parameter is not allowed", __func__);
    
52.                 return NULL;
    
53.         }
    
54. 
    
55.         // 先搜一遍：找有多少个可替换先
    
56.         end = begin = (char *) str;
    
57.         count = 0;
    
58.         for ( end = strstr(str, "\"");
    
59.                 NULL != end;
    
60.                 end = strstr(begin, "\"") )
    
61.         {
    
62.                 count++;
    
63.                 begin = end + lenToken;
    
64.         }
    
65. 
    
66.         // 预分配替换后的目标字符串缓冲
    
67.         lenResult = strlen(str) + count * (lenReplacement - lenToken) + 1;
    
68.         output = malloc(lenResult);
    
69. 
    
70.         // 真正进行替换
    
71.         end = begin = (char *) str;
    
72.         tmp = output;
    
73.         for ( end = strstr(str, "\"");
    
74.                 NULL != end;
    
75.                 end = strstr(begin, "\"") )
    
76.         {
    
77.                 len = end - begin;
    
78.                 memcpy(tmp, begin, len); tmp += len;
    
79.                 // 目标字符串，游标移位
    
80.                 for (i=0; i<lenReplacement; i++)
    
81.                 {
    
82.                         *tmp = replacement[i];
    
83.                         tmp++;
    
84.                 }
    
85.                 // 源字符串，游标移位
    
86.                 begin = end + lenToken;
    
87.         }
    
88. 
    
89.         // 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）
    
90.         len = strlen(str) - (begin - str);
    
91.         if (len > 0)
    
92.                 memcpy(tmp, begin, len);
    
93. 
    
94.         // 目标字符串加终止符，确保不越界
    
95.         output[lenResult - 1] = '\0';
    
96. 
    
97.         return output;
    
98. }
    

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风扬蛮子

1. /*********** (C) COPYRIGHT 2015 Gizwits *************
   
2. * @file              : strrpl.h
   
3. * @author            : William Yip
   
4. * @date              : 18 Dec 2015
   
5. * @version           : 1.0
   
6. * @brief             : 连接、增值、开放、中立、安全、自有、自由、生态
   
7. ************************************
   
8. * History:
   
9. ************************************
   
10. THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
    
11. CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A
    
12. RESULT, GIZWITS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR
    
13. CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF
    
14. SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
    
15. CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
    
16. ************************************/
    
17. 
    
18. #ifndef _GIZWITS_STRRPL_H_
    
19. #define _GIZWITS_STRRPL_H_
    
20. 
    
21. #include <string.h>
    
22. #include <stdlib.h>
    
23. #include <stdio.h>
    
24. 
    
25. // #define GIZWITS_STRRPL_EXAMPLE
    
26. 
    
27. /**
    
28. * @desc C助手函数，字符串替换
    
29. * @param str 源字符串
    
30. * @param token 将被替换的内容
    
31. * @param replacement 要替换成的新内容
    
32. * @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
    
33. */
    
34. char * strrpl(const char * str, const char * token, const char * replacement);
    
35. 
    
36. #endif // _GIZWITS_STRRPL_H_
    

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看上去很不错哦～