1  /* readline.c --- Simple implementation of readline.
       2     Copyright (C) 2005-2007, 2009-2021 Free Software Foundation, Inc.
       3     Written by Simon Josefsson
       4  
       5     This program is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU 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 General Public License for more details.
      14  
      15     You should have received a copy of the GNU General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <config.h>
      19  
      20  /* This module is intended to be used when the application only needs
      21     the readline interface.  If you need more functions from the
      22     readline library, it is recommended to require the readline library
      23     (or improve this module) rather than #if-protect part of your
      24     application (doing so would add assumptions of this module into
      25     your application).  The application should use #include
      26     "readline.h", that header file will include <readline/readline.h>
      27     if the real library is present on the system. */
      28  
      29  /* Get specification. */
      30  #include "readline.h"
      31  
      32  #include <stdio.h>
      33  #include <string.h>
      34  
      35  char *
      36  readline (const char *prompt)
      37  {
      38    char *out = NULL;
      39    size_t size = 0;
      40  
      41    if (prompt)
      42      {
      43        fputs (prompt, stdout);
      44        fflush (stdout);
      45      }
      46  
      47    if (getline (&out, &size, stdin) < 0)
      48      return NULL;
      49  
      50    while (*out && (out[strlen (out) - 1] == '\r'
      51                    || out[strlen (out) - 1] == '\n'))
      52      out[strlen (out) - 1] = '\0';
      53  
      54    return out;
      55  }