strstr function

 

strstr will find a sub-string within a string. See also strchr which will look for a character in a string.

Library:   string.h

Prototype: char * strstr(const char *s1, const char *s2);

Syntax:	   char string1[]="red dwarf";
	   char string2[]="dwarf";
	   void *pointer;
           pointer = strstr(string1, string2);

strstr returns a pointer to the beginning of the sub-string or NULL if not found.

 

 

/*****************************************************************
 *
 * Purpose: Program to demonstrate the 'strstr' function.
 * Author:  M J Leslie
 * Date:    18-Jun-94
 *
 *****************************************************************/

#include <stdio.h>
#include <string.h>

main()
{
  char string[]="string to search";
  char   test[]="sear";

			/* strstr returns a pointer into 'string'
			 * if 'test' is found' if not found, NULL 
			 * is returned.				*/

  if (strstr(string, test)) puts("String found");

}