Strstr - Texas Instruments TI-89 Developer's Manual

1002

strstr

Declaration: char * strstr (const char * s1 , const char * s2 )
Category(ies): Strings
Description: Searches the string pointed to by s1 for a substring matching the string
pointed to by s2 .
s1 — Character string to search in.
Inputs:
s2 — Character string to search for.
Returns a pointer to the first character of the matching substring in s1 , or a
Outputs:
null pointer if no matching substring is found.
Assumptions: None
Side Effects: None
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: strchr, memchr
Example:
BOOL findstr( const char *str1, const char *str2, char *buf )
/* findstr - Find the first instance of string str2 in string str1.
Return TRUE if found str2 in str1 and build message in buf,
else return FALSE.
*/
{
char *ptr;
if( ( ptr = strstr(str1, str2)) == NULL )
return( FALSE );
sprintf( buf, "Found '%s' at position %d in string: %s\n",
str2, (ptr - str1 + 1), str1);
return( TRUE );
}
TI-89 / TI-92 Plus Developer Guide
Appendix A: System Routines — Strings
/* str2 not found in str1 */
Not for Distribution Beta Version January 26, 2001