strlen()

Arguments:

s

The string whose length you want to calculate.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The strlen() function computes the length of the string pointed to by s.

Returns:

The number of characters that precede the terminating null character.

Examples:

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

int main( void )
  {
    printf( "%d\n", strlen( "Howdy" ) );
    printf( "%d\n", strlen( "Hello world\n" ) );
    printf( "%d\n", strlen( "" ) );

    return EXIT_SUCCESS;
  }

produces the output:

5
12
0

Environment variables:

LIBC_STRINGS

On certain targets, you can use this environment variable to select the implementation of strlen(). The value is one of the strings given below.

• for AArch64 targets:
  • generic — the default

Classification:

ANSI, POSIX 1003.1