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1/* SPDX-License-Identifier: GPL-3.0
2 * The Language Trail
3 *
4 * ctype.c
5 *
6 * Exploration of the <ctype> standard header. This header is pretty self
7 * explanatory, but useful.
8 *
9 * https://en.cppreference.com/w/c/header/ctype.html
10 *
11 * COPYRIGHT NOTICE
12 * Copyright (C) 2025 0x4248 and contributors
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the license is not changed.
15 *
16 * This software is free and open source. Licensed under the GNU general
17 * public license version 3.0 as published by the Free Software Foundation.
18*/
19
20#include <ctype.h>
21#include <stdio.h>
22
23// ########## CHECKLIST ##########
24// isalnum  [TODO]
25// isalpha  [X]
26// islower  [X]
27// isupper  [TODO]
28// isdigit  [TODO]
29// isxdigit [TODO]
30// iscntrl  [TODO]
31// isgraph  [TODO]
32// isspace  [TODO]
33// isblank  [TODO]
34// isprint  [TODO]
35// ispunct  [TODO]
36// tolower  [TODO]
37// toupper  [TODO]
38
39/** isLower(chr)
40 * checks if a char is "abcdefghijklmnopqrstuvwxyz"
41 *
42 * Return: 0 on lowercase, non zero on uppercase (int: 512)
43 */
44void test_isLower(){
45    char str[12] = "aBcDEfg123!#";
46   	for (int i = 0; i < sizeof(str); i++) {
47        if(islower(str[i])){
48            printf("%c\tis lowercase\n",str[i]);
49        } else {
50            /* This is not always true, see in the testing you can see the
51             * numbers printed with the uppercase, but yet again its only
52             * checking for "abcdefghijklmnopqrstuvwxyz"
53             */
54            printf("%c\tis UPPERCASE\n",str[i]);
55        }
56
57	}
58}
59
60/** isalnum(chr)
61 * checks if a char is a number or a letter in latin.
62 *
63 * Return: 0 on alphanumeric, non zero on non alphanumeric
64 */
65void test_isalnum(){
66    char str[12] = "aBcDEfg123!#";
67   	for (int i = 0; i < sizeof(str); i++) {
68        if(isalnum(str[i])){
69            printf("%c\tTRUE\n",str[i]);
70        } else {
71            printf("%c\tFALSE\n",str[i]);
72        }
73
74	}
75}
76
77
78
79int main(void){
80    printf("---[isLower]---\n");
81    test_isLower();
82    printf("---[isalnum]---\n");
83    test_isalnum();
84    return 0;
85}
86
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