compiler/stdc/gets.c

   1 /*
   2     Copyright © 1995-2016, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function gets().
   6 */
   7 #include <libraries/stdcio.h>
   8 #include <string.h>
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <stdio.h>
  14
  15         char * gets (
  16
  17 /*  SYNOPSIS */
  18         char * buffer)
  19
  20 /*  FUNCTION
  21         Read one line of characters from the standard input stream into
  22         the buffer. Reading will stop, when a newline ('\n') is encountered,
  23         EOF or when the buffer is full. If a newline is read, then it is
  24         replaced by '\0'. The last character in the buffer is always '\0'.
  25
  26     INPUTS
  27         buffer - Write characters into this buffer
  28
  29     RESULT
  30         buffer when successful. NULL in case of an error or when EOF without any
  31         characters read. In the latter case buffer array is unchanged.
  32
  33     NOTES
  34
  35     EXAMPLE
  36
  37     BUGS
  38         Never use this function. gets() does not know how large the buffer
  39         is and will continue to store characters past the end of the buffer
  40         if it has not encountered a newline or EOF yet. Use fgets() instead.
  41
  42     SEE ALSO
  43         fgets()
  44
  45     INTERNALS
  46
  47 ******************************************************************************/
  48 {
  49     struct StdCIOBase *StdCIOBase = __aros_getbase_StdCIOBase();
  50     char *s = buffer;
  51     int c;
  52
  53     c = getchar();
  54     while(c != '\n' && c != EOF)
  55     {
  56         *s = c;
  57         s++;
  58         c = getchar();
  59     }
  60
  61     if (ferror(StdCIOBase->_stdin))
  62     {
  63         *s = 0;
  64         return NULL;
  65     }
  66     else if (c == EOF && s == buffer)
  67     {
  68         return NULL;
  69     }
  70     else
  71     {
  72         *s = 0;
  73         return buffer;
  74     }
  75 } /* gets */