lib/stdlibc/ctype.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU Lesser General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <ctype.h>
  20
  21 int iscntrl(int c) {
  22   return c<' ';
  23 }
  24
  25 int isdigit(int c) {
  26   return c>='0' && c<='9';
  27 }
  28
  29 int islower(int c) {
  30   return c>='a' && c<='z';
  31 }
  32
  33 int isprint(int c) {
  34   return c>=' ';
  35 }
  36
  37 int isspace(int c) {
  38   return c==' ' || c=='\f' || c=='\n' || c=='\r' || c=='\t' || c=='\v';
  39 }
  40
  41 int isblank(int c) {
  42   return isspace(c);
  43 }
  44
  45 int isupper(int c) {
  46   return c>='A' && c<='Z';
  47 }
  48
  49 int isxdigit(int c) {
  50   return isdigit(c) || (c>='A' && c<='F') || (c>='a' && c<='f');
  51 }
  52
  53 int isalpha(int c) {
  54   return isupper(c) || islower(c);
  55 }
  56
  57 int isalnum(int c) {
  58   return isalpha(c) || isdigit(c);
  59 }
  60
  61 int isgraph(int c) {
  62   return isalnum(c) && c!=' '; /** @todo please do it the right way */
  63 }
  64
  65 int ispunct(int c) {
  66   return isprint(c) && !isalnum(c); /** @todo is that right? **/
  67 }
  68
  69 char tolower(int c) {
  70   return isupper(c)?c+('a'-'A'):c;
  71 }
  72
  73 char toupper(int c) {
  74   return islower(c)?c-('a'-'A'):c;
  75 }