NAME

strlen − Finds length of string

LIBRARY

Standard C Library (libc.a)

SYNOPSIS

#include <string.h> size_t strlen(
const char ∗s);

PARAMETERS

sSpecifies the string. 

DESCRIPTION

The strlen() function returns the number of bytes in the string pointed to by the s parameter. The string length value does not include the string terminating null character. 

Note

If you pass a NULL pointer as the const char ∗ parameter to the strlen function, the function generates a segmentation violation.  To avoid the segmentation violation and cause the function to return zero, change the NULL pointer treatment for the process before issuing the call to the strlen function, as follows:

     1.Include the system header file sys/uswitch.h. 

     2.Call the uswitch function, as described in the uswitch(3) reference page. 

The following program illustrates this procedure:

#include <stdio.h>
#include <sys/types.h>
#include <sys/uswitch.h>
main()
{
        size_t  retval;
        int     uswitch_val;
        uswitch_val = uswitch(USC_GET,0);
        uswitch(USC_SET, uswitch_val | USW_NULLP);
        retval = strlen(NULL);

NOTES

AES Support Level:
Full use.

RETURN VALUES

Upon successful completion, the strlen() function returns the number of characters in the string to which the s parameter points. Otherwise, (size_t)-1 is returned, and errno is set to indicate the error. 

RELATED INFORMATION

Functions: string(3), uswitch(3), wcslen(3).