mem中需找特定字符

memstr

 1 //find 'substr' from a fixed-length buffer 
 2 //('full_data' will be treated as binary data buffer)
 3 //return NULL if not found
 4 char* memstr(char* full_data, int full_data_len, char* substr)
 5 {
 6     if (full_data == NULL || full_data_len <= 0 || substr == NULL) {
 7         return NULL;
 8     }
 9 
10     if (*substr == '\0') {
11         return NULL;
12     }
13 
14     int sublen = strlen(substr);
15 
16     int i;
17     char* cur = full_data;
18     int last_possible = full_data_len - sublen + 1;
19     for (i = 0; i < last_possible; i++) {
20         if (*cur == *substr) {
21             //assert(full_data_len - i >= sublen);
22             if (memcmp(cur, substr, sublen) == 0) {
23                 //found
24                 return cur;
25             }
26         }
27         cur++;
28     }
29 
30     return NULL;
31 }

memfind

1 char* memstr(char* full_data, int full_data_len, char* substr, int substr_len)
2 {
3 
4 }

 

转载于:https://www.cnblogs.com/Huluwa-Vs-Aoteman/p/3641386.html