range_str4inbuf - range check for string in buffer

       range_str4inbuf  checks  that the zero terminated UTF-32-string starting at string starts and ends within
       the buffer buf[0..len-1].

       If the string is not 0-terminated but the length is known beforehand, use range_arrayinbuf instead.

       range_str4inbuf - range check for string in buffer

       If the buffer is implausible (buf is NULL or buf+len has an integer overflow), return 0.

       If string points before or after the buffer, return 0.

       If there is no zero terminator within the buffer, return 0.

       Otherwise, return 1.

rangecheck(3)

                                                                                              range_str4inbuf(3)

#include<libowfat/rangecheck.h>

       int range_str4inbuf(const void* buf,size_t len,const void* string);