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strlen()

Compute the length of a string

Synopsis:

#include <string.h>

size_t strlen( const char * s );

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

Classification:

ANSI, POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes

See also:

wcslen()

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