libc.info: strlen

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`strlen'--character string length

*Synopsis*
     #include <string.h>
     size_t strlen(const char *STR);
   *Description*
The `strlen' function works out the length of the string starting at
`*STR' by counting chararacters until it reaches a `NULL' character.
*Returns*
`strlen' returns the character count.
*Portability*
`strlen' is ANSI C.
   `strlen' requires no supporting OS subroutines.