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Annotation of embedaddon/readline/examples/manexamp.c, revision 1.1.1.1

1.1       misho       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: }