range_strinbuf - range check for string in buffer

       range_strinbuf  checks  that  the ASCIIZ-string starting at stringstart 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_strinbuf - range check for string in buffer

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

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

       If there is no '\0' within the buffer, return 0.

       Otherwise, return 1.

rangecheck(3)

                                                                                               range_strinbuf(3)

#include<libowfat/rangecheck.h>

       int range_strinbuf(const void* buf,size_t len,const void* stringstart);