// Copyright (c) 2025, Zak Fenton
// Zak Fenton's libc is licensed under the Mulan PSL v2. You can use this
// software according to the terms and conditions of the Mulan PSL v2.
// You may obtain a copy of Mulan PSL v2 at:
// http://license.coscl.org.cn/MulanPSL2
// THIS SOFTWARE IS PROVIDED ON AN “AS IS” BASIS, WITHOUT warranties of
// any kind, either express or implied, including but not limited to
// non-infringement, merchantability or fit for a particular purpose.
// See the Mulan PSL v2 for more details.

#include <ctype.h>

int isspace(int ch) {
    return (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n');
}

int isdigit(int ch) {
    return (ch >= '0') && (ch <= '9');
}

int isxdigit(int ch) {
    return isdigit(ch) || ((ch >= 'a') && (ch <= 'f')) || ((ch >= 'A') && (ch <= 'F'));
}

int isalpha(int ch) {
    return ((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z'));
}

int isalnum(int ch) {
    return isalpha(ch) || isdigit(ch);
}

int isprint(int ch) {
    return isalnum(ch) || isspace(ch) || ispunct(ch);
}

int ispunct(int ch) {
    switch (ch) {
        case ',':
        case '<':
        case '.':
        case '>':
        case '/':
        case '?':
        case ';':
        case ':':
        case '\'':
        case '\"':
        case '[':
        case ']':
        case '{':
        case '}':
        case '`':
        case '~':
        case '@':
        case '#':
        case '$':
        case '%':
        case '^':
        case '&':
        case '*':
        case '(':
        case ')':
        case '-':
        case '_':
        case '=':
        case '+':
        return 1;
        default:
        return 0;
    }
}

int isupper(int ch) {
  if (ch >= 'A' && ch <= 'Z') {
    return 1;
  } else {
    return 0;
  }
}

int islower(int ch) {
  if (ch >= 'a' && ch <= 'a') {
    return 1;
  } else {
    return 0;
  }
}

int toupper(int ch)  {
  if (ch >= 'a' && ch <= 'z') {
    return ((int)'A') + (ch - ((int)'a'));
  } else {
    return ch;
  }
}

int tolower(int ch)  {
  if (ch >= 'A' && ch <= 'Z') {
    return ((int)'a') + (ch - ((int)'A'));
  } else {
    return ch;
  }
}

int isascii(int ch) {
  int ascii = ch & 0x7F;
  if (ch == ascii) {
    return 1;
  } else {
    return 0;
  }
}