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Initial revision

    1: /* manexamp.c -- The examples which appear in the documentation are here. */
    2: 
    3: /* Copyright (C) 1987-2009 Free Software Foundation, Inc.
    4: 
    5:    This file is part of the GNU Readline Library (Readline), a library for
    6:    reading lines of text with interactive input and history editing.
    7: 
    8:    Readline is free software: you can redistribute it and/or modify
    9:    it under the terms of the GNU General Public License as published by
   10:    the Free Software Foundation, either version 3 of the License, or
   11:    (at your option) any later version.
   12: 
   13:    Readline is distributed in the hope that it will be useful,
   14:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   16:    GNU General Public License for more details.
   17: 
   18:    You should have received a copy of the GNU General Public License
   19:    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
   20: */
   21: 
   22: #include <stdio.h>
   23: #include <readline/readline.h>
   24: 
   25: /* **************************************************************** */
   26: /*                                                                  */
   27: /*   			How to Emulate gets ()			    */
   28: /*                                                                  */
   29: /* **************************************************************** */
   30: 
   31: /* A static variable for holding the line. */
   32: static char *line_read = (char *)NULL;
   33: 
   34: /* Read a string, and return a pointer to it.  Returns NULL on EOF. */
   35: char *
   36: rl_gets ()
   37: {
   38:   /* If the buffer has already been allocated, return the memory
   39:      to the free pool. */
   40:   if (line_read)
   41:     {
   42:       free (line_read);
   43:       line_read = (char *)NULL;
   44:     }
   45: 
   46:   /* Get a line from the user. */
   47:   line_read = readline ("");
   48: 
   49:   /* If the line has any text in it, save it on the history. */
   50:   if (line_read && *line_read)
   51:     add_history (line_read);
   52: 
   53:   return (line_read);
   54: }
   55: 
   56: /* **************************************************************** */
   57: /*                                                                  */
   58: /*        Writing a Function to be Called by Readline.              */
   59: /*                                                                  */
   60: /* **************************************************************** */
   61: 
   62: /* Invert the case of the COUNT following characters. */
   63: invert_case_line (count, key)
   64:      int count, key;
   65: {
   66:   register int start, end;
   67: 
   68:   start = rl_point;
   69: 
   70:   if (count < 0)
   71:     {
   72:       direction = -1;
   73:       count = -count;
   74:     }
   75:   else
   76:     direction = 1;
   77:       
   78:   /* Find the end of the range to modify. */
   79:   end = start + (count * direction);
   80: 
   81:   /* Force it to be within range. */
   82:   if (end > rl_end)
   83:     end = rl_end;
   84:   else if (end < 0)
   85:     end = -1;
   86: 
   87:   if (start > end)
   88:     {
   89:       int temp = start;
   90:       start = end;
   91:       end = temp;
   92:     }
   93: 
   94:   if (start == end)
   95:     return;
   96: 
   97:   /* Tell readline that we are modifying the line, so save the undo
   98:      information. */
   99:   rl_modifying (start, end);
  100: 
  101:   for (; start != end; start += direction)
  102:     {
  103:       if (_rl_uppercase_p (rl_line_buffer[start]))
  104: 	rl_line_buffer[start] = _rl_to_lower (rl_line_buffer[start]);
  105:       else if (_rl_lowercase_p (rl_line_buffer[start]))
  106: 	rl_line_buffer[start] = _rl_to_upper (rl_line_buffer[start]);
  107:     }
  108: 
  109:   /* Move point to on top of the last character changed. */
  110:   rl_point = end - direction;
  111: }