Find sub string: our own function : String Search « String « C / ANSI-C

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C / ANSI-C » String » String SearchScreenshots 
Find sub string: our own function

#include <stdio.h>

int find_substr(char *listPointer, char *itemPointer);

int main(void)
{
  if(find_substr("C is fun", "is") != -1)
    printf("Substring is found.");

  return 0;
}

/* Return index of first match of itemPointer in listPointer. */
int find_substr(char *listPointer, char *itemPointer)
{
  int t;
  char *p, *p2;

  for(t=0; listPointer[t]; t++) {
    p = &listPointer[t];
    p2 = itemPointer;

    while(*p2 && *p2==*p) {
      p++;
      p2++;
    }
    if(!*p2) return t; /* 1st return */
  }
   return -1; /* 2nd return */
}

  

           
       
Related examples in the same category
1. Look up names in a hardcoded list
2. Finding occurrences of one string in another: strstr
3. A demonstration of seeking and findingA demonstration of seeking and finding
4. Search a char inside a string
5.  Scan string for specified characters
6.  Find last occurrence of character in string
7.  Find substring
8.  Search string for occurrence of character set
9. Search string
10.  Search string for occurrence of character set: how to use strcspn
11.  Scan string for specified characters: how to use strpbrk
12.  Find last occurrence of character in string: how to use strrchr
13.  Find substring: how to use strstr
14.  Find character in string: how to use strchr
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