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FreeBSD 11.0 - man page for digittoint (freebsd section 3)

DIGITTOINT(3)						   BSD Library Functions Manual 					     DIGITTOINT(3)

NAME
digittoint -- convert a numeric character to its integer value
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h> int digittoint(int c); int digittoint_l(int c, locale_t loc);
DESCRIPTION
The digittoint() function converts a numeric character to its corresponding integer value. The character can be any decimal digit or hexa- decimal digit. With hexadecimal characters, the case of the values does not matter. The digittoint_l() function takes an explicit locale argument, whereas the digittoint() function use the current global or per-thread locale.
RETURN VALUES
The digittoint() function always returns an integer from the range of 0 to 15. If the given character was not a digit as defined by isxdigit(3), the function will return 0.
SEE ALSO
ctype(3), isdigit(3), isxdigit(3), xlocale(3)
BSD
April 6, 2001 BSD