strcspn() — Compare strings

Standards

Standards / Extensions	C or C++	Dependencies
ISO C XPG4 XPG4.2 C99 Single UNIX Specification, Version 3	both

Format

#include <string.h>

size_t strcspn(const char *string1, const char *string2);

General description

Computes the length of the initial portion of the string pointed to by string1 that contains no characters from the string pointed to by string2.

Returned value

strcspn() returns the calculated length of the initial portion found.

Example

CELEBS39

⁄* CELEBS39                                      

   This example uses &strcspn. to find the first occurrence of                  
   any of the characters a, x, l or e in string.                                
                                                                                
 *⁄                                                                             
#include <stdio.h>                                                              
#include <string.h>                                                             
                                                                                
#define SIZE    40                                                              
                                                                                
int main(void)                                                                  
{                                                                               
  char string[ SIZE ] = "This is the source string";                            
  char * substring = "axle";                                                    
                                                                                
  printf( "The first %i characters in the string \"%s\"\                        
  are not in the " "string \"%s\" \n",                                          
            strcspn(string, substring), string, substring);                     
}

Output

The first 10 characters in the string "This is the source string"
are not in the string "axle"