strstr

could you guys explain what does strstr function do?
thanks
zuneraAsked:
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jhanceConnect With a Mentor Commented:
strstr locates a SUBSTRING within another string.

Let's say you have:

char *str1 = "This is only a test";
char *p;

and you do:

p = strstr(str1, "only");

p will point to the "o" in only.  If, however, you did:

p = strstr(str1, "ONLY");

p will be NULL since the string "ONLY" does not appear in the string str1.
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AxterCommented:
char *strstr(const char *string, const char *strCharSet)

The strstr function returns a pointer to the first occurrence of strCharSet in string.
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AxterCommented:
Example

/* STRSTR.C */

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

char str[] =    "lazy";
char string[] = "The quick brown dog jumps over the lazy fox";
char fmt1[] =   "         1         2         3         4         5";
char fmt2[] =   "12345678901234567890123456789012345678901234567890";

void main( void )
{
   char *pdest;
   int  result;
   printf( "String to be searched:\n\t%s\n", string );
   printf( "\t%s\n\t%s\n\n", fmt1, fmt2 );
   pdest = strstr( string, str );
   result = pdest - string + 1;
   if( pdest != NULL )
      printf( "%s found at position %d\n\n", str, result );
   else
      printf( "%s not found\n", str );
}


Output

String to be searched:
   The quick brown dog jumps over the lazy fox
            1         2         3         4         5
   12345678901234567890123456789012345678901234567890

lazy found at position 36

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AxterCommented:
I just copied and pasted this from MSN help document.
See following link for more info.
http://msdn.microsoft.com/library/devprods/vs6/visualc/vccore/_crt_strstr.2c_.wcsstr.2c_._mbsstr.htm
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zuneraAuthor Commented:
Answer is very simple and clear, great thanks
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