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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5.  
  6. int find_substring(char * buffer, int size, char * substring)
  7. {
  8.     char * init_buffer= buffer;
  9.     char c, sc;
  10.     size_t len;
  11.  
  12.     if ((c = *substring++) != 0) {
  13.         len = strlen(substring);
  14.         do {
  15.             do {
  16.                 if(buffer-init_buffer>size-len)
  17.                 {
  18.                     return -1;
  19.                 }
  20.                 sc = *buffer++;
  21.             } while (sc != c);
  22.         } while (strncmp(buffer, substring, len) != 0);
  23.     }
  24.     return buffer-init_buffer+len;
  25. }
  26.  
  27. int main(void) {
  28. 	char text[9]="ababababc";
  29. 	char * find="abc";
  30. 	printf("%d\n",find_substring(text,9,find));
  31. 	return 0;
  32. }
  33.  
Success #stdin #stdout 0s 9424KB
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9
https://ideone.com/sKJ4D2
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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