45 lines
885 B
C
45 lines
885 B
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef CTYPE_H
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#define CTYPE_H
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/**
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* \file
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*
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* Provides a subset of the functions normally provided by <ctype.h>.
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*
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*//*
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* Copyright (C) 2020-2022 Martin Whitaker.
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*/
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/**
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* If c is a lower-case letter, returns its upper-case equivalent, otherwise
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* returns c. Assumes c is an ASCII character.
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*/
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static inline int toupper(int c)
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{
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if (c >= 'a' && c <= 'z') {
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return c + 'A' -'a';
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} else {
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return c;
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}
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}
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/**
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* Returns 1 if c is a decimal digit, otherwise returns 0. Assumes c is an
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* ASCII character.
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*/
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static inline int isdigit(int c)
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{
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return c >= '0' && c <= '9';
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}
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/**
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* Returns 1 if c is a hexadecimal digit, otherwise returns 0. Assumes c is an
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* ASCII character.
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*/
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static inline int isxdigit(int c)
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{
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return isdigit(c) || (toupper(c) >= 'A' && toupper(c) <= 'F');
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}
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#endif // CTYPE_H
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