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Man Pages
DIGITTOINT(3) FreeBSD Library Functions Manual DIGITTOINT(3)

digittoint
convert a numeric character to its integer value

Standard C Library (libc, -lc)

#include <ctype.h>

int
digittoint(int c);

int
digittoint_l(int c, locale_t loc);

The digittoint() function converts a numeric character to its corresponding integer value. The character can be any decimal digit or hexadecimal 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.

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.

ctype(3), isdigit(3), isxdigit(3), xlocale(3)
April 6, 2001 FreeBSD 13.1-RELEASE

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