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strlen(3)
NAME
  strlen - Find the length of a string

SYNOPSIS
  #include <string.h>

  size_t strlen(
	  const char *s );

LIBRARY
  Standard C Library (libc)

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  strlen(): ISO C, XPG4

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

PARAMETERS
  s   Specifies 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
  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 0 (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(2)
	    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);

RETURN VALUES
  On successful completion, the strlen() function returns the number of
  characters (bytes) in the string to which the s parameter points. Current
  industry standards specify that no value be reserved to indicate an error.

SEE ALSO
  Functions: string(3), uswitch(2), wcslen(3)

  Standards: standards(5)

Index for Section 3

Alphabetical listing for S

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