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Annotation of embedaddon/readline/examples/rl.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * rl - command-line interface to read a line from the standard input
        !             3:  *      (or another fd) using readline.
        !             4:  *
        !             5:  * usage: rl [-p prompt] [-u unit] [-d default] [-n nchars]
        !             6:  */
        !             7: 
        !             8: /* Copyright (C) 1987-2009 Free Software Foundation, Inc.
        !             9: 
        !            10:    This file is part of the GNU Readline Library (Readline), a library for
        !            11:    reading lines of text with interactive input and history editing.
        !            12: 
        !            13:    Readline is free software: you can redistribute it and/or modify
        !            14:    it under the terms of the GNU General Public License as published by
        !            15:    the Free Software Foundation, either version 3 of the License, or
        !            16:    (at your option) any later version.
        !            17: 
        !            18:    Readline is distributed in the hope that it will be useful,
        !            19:    but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            20:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            21:    GNU General Public License for more details.
        !            22: 
        !            23:    You should have received a copy of the GNU General Public License
        !            24:    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
        !            25: */
        !            26: 
        !            27: #if defined (HAVE_CONFIG_H)
        !            28: #  include <config.h>
        !            29: #endif
        !            30: 
        !            31: #include <stdio.h>
        !            32: #include <sys/types.h>
        !            33: 
        !            34: #ifdef HAVE_STDLIB_H
        !            35: #  include <stdlib.h>
        !            36: #else 
        !            37: extern void exit();
        !            38: #endif
        !            39: 
        !            40: #if defined (READLINE_LIBRARY)
        !            41: #  include "posixstat.h"
        !            42: #  include "readline.h"
        !            43: #  include "history.h"
        !            44: #else
        !            45: #  include <sys/stat.h>
        !            46: #  include <readline/readline.h>
        !            47: #  include <readline/history.h>
        !            48: #endif
        !            49: 
        !            50: extern int optind;
        !            51: extern char *optarg;
        !            52: 
        !            53: #if !defined (strchr) && !defined (__STDC__)
        !            54: extern char *strrchr();
        !            55: #endif
        !            56: 
        !            57: static char *progname;
        !            58: static char *deftext;
        !            59: 
        !            60: static int
        !            61: set_deftext ()
        !            62: {
        !            63:   if (deftext)
        !            64:     {
        !            65:       rl_insert_text (deftext);
        !            66:       deftext = (char *)NULL;
        !            67:       rl_startup_hook = (rl_hook_func_t *)NULL;
        !            68:     }
        !            69:   return 0;
        !            70: }
        !            71: 
        !            72: static void
        !            73: usage()
        !            74: {
        !            75:   fprintf (stderr, "%s: usage: %s [-p prompt] [-u unit] [-d default] [-n nchars]\n",
        !            76:                progname, progname);
        !            77: }
        !            78: 
        !            79: int
        !            80: main (argc, argv)
        !            81:      int argc;
        !            82:      char **argv;
        !            83: {
        !            84:   char *temp, *prompt;
        !            85:   struct stat sb;
        !            86:   int opt, fd, nch;
        !            87:   FILE *ifp;
        !            88: 
        !            89:   progname = strrchr(argv[0], '/');
        !            90:   if (progname == 0)
        !            91:     progname = argv[0];
        !            92:   else
        !            93:     progname++;
        !            94: 
        !            95:   /* defaults */
        !            96:   prompt = "readline$ ";
        !            97:   fd = nch = 0;
        !            98:   deftext = (char *)0;
        !            99: 
        !           100:   while ((opt = getopt(argc, argv, "p:u:d:n:")) != EOF)
        !           101:     {
        !           102:       switch (opt)
        !           103:        {
        !           104:        case 'p':
        !           105:          prompt = optarg;
        !           106:          break;
        !           107:        case 'u':
        !           108:          fd = atoi(optarg);
        !           109:          if (fd < 0)
        !           110:            {
        !           111:              fprintf (stderr, "%s: bad file descriptor `%s'\n", progname, optarg);
        !           112:              exit (2);
        !           113:            }
        !           114:          break;
        !           115:        case 'd':
        !           116:          deftext = optarg;
        !           117:          break;
        !           118:        case 'n':
        !           119:          nch = atoi(optarg);
        !           120:          if (nch < 0)
        !           121:            {
        !           122:              fprintf (stderr, "%s: bad value for -n: `%s'\n", progname, optarg);
        !           123:              exit (2);
        !           124:            }
        !           125:          break;
        !           126:        default:
        !           127:          usage ();
        !           128:          exit (2);
        !           129:        }
        !           130:     }
        !           131: 
        !           132:   if (fd != 0)
        !           133:     {
        !           134:       if (fstat (fd, &sb) < 0)
        !           135:        {
        !           136:          fprintf (stderr, "%s: %d: bad file descriptor\n", progname, fd);
        !           137:          exit (1);
        !           138:        }
        !           139:       ifp = fdopen (fd, "r");
        !           140:       rl_instream = ifp;
        !           141:     }
        !           142: 
        !           143:   if (deftext && *deftext)
        !           144:     rl_startup_hook = set_deftext;
        !           145: 
        !           146:   if (nch > 0)
        !           147:     rl_num_chars_to_read = nch;
        !           148: 
        !           149:   temp = readline (prompt);
        !           150: 
        !           151:   /* Test for EOF. */
        !           152:   if (temp == 0)
        !           153:     exit (1);
        !           154: 
        !           155:   printf ("%s\n", temp);
        !           156:   exit (0);
        !           157: }