reactos/lib/sdk/crt/conio/cgets.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * FILE:             msvcrt/conio/cgets.c
   5  * PURPOSE:          C Runtime
   6  * PROGRAMMER:       Eric Kohl (Imported from DJGPP)
   7  */
   8
   9 #include <precomp.h>
  10
  11 /*
  12  * @implemented
  13  */
  14 char *_cgets(char *string)
  15 {
  16   unsigned len = 0;
  17   unsigned int maxlen_wanted;
  18   char *sp;
  19   int c;
  20   /*
  21    * Be smart and check for NULL pointer.
  22    * Don't know wether TURBOC does this.
  23    */
  24   if (!string)
  25     return(NULL);
  26   maxlen_wanted = (unsigned int)((unsigned char)string[0]);
  27   sp = &(string[2]);
  28   /*
  29    * Should the string be shorter maxlen_wanted including or excluding
  30    * the trailing '\0' ? We don't take any risk.
  31    */
  32   while(len < maxlen_wanted-1)
  33   {
  34     c=_getch();
  35     /*
  36      * shold we check for backspace here?
  37      * TURBOC does (just checked) but doesn't in cscanf (thats harder
  38      * or even impossible). We do the same.
  39      */
  40     if (c == '\b')
  41     {
  42       if (len > 0)
  43       {
  44         _cputs("\b \b");        /* go back, clear char on screen with space
  45                                    and go back again */
  46         len--;
  47         sp[len] = '\0';         /* clear the character in the string */
  48       }
  49     }
  50     else if (c == '\r')
  51     {
  52       sp[len] = '\0';
  53       break;
  54     }
  55     else if (c == 0)
  56     {
  57       /* special character ends input */
  58       sp[len] = '\0';
  59       _ungetch(c);              /* keep the char for later processing */
  60       break;
  61     }
  62     else
  63     {
  64       sp[len] = _putch(c);
  65       len++;
  66     }
  67   }
  68   sp[maxlen_wanted-1] = '\0';
  69   string[1] = (char)((unsigned char)len);
  70   return(sp);
  71 }
  72
  73