Enrico Fraccaroli (Galfurian)
68 lines
1.0 KiB
C
68 lines
1.0 KiB
C
/// @file ctype.c
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/// @brief Functions related to character handling.
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/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include "ctype.h"
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/// Distance from a uppercase character to the correspondent lowercase in ASCII.
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#define OFFSET 32
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int isdigit(int c)
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{
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return (c >= 48 && c <= 57);
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}
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int isalpha(int c)
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{
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return ((c >= 65 && c <= 90) || (c >= 97 && c <= 122));
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}
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int iscntrl(int c)
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{
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return ((c >= 0x00 && c <= 0x1F) || (c == 0x7F));
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}
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int isalnum(int c)
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{
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return (isalpha(c) || isdigit(c));
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}
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int isxdigit(int c)
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{
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return (isdigit(c) || (c >= 65 && c <= 70));
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}
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int islower(int c)
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{
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return (c >= 97 && c <= 122);
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}
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int isupper(int c)
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{
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return (c >= 65 && c <= 90);
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}
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int tolower(int c)
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{
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if (isalpha(c) == 0 || islower(c)) {
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return c;
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}
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return c + OFFSET;
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}
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int toupper(int c)
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{
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if (isalpha(c) == 0 || isupper(c)) {
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return c;
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}
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return c - OFFSET;
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}
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int isspace(int c)
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{
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return (c == ' ');
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}
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