readline/examples/rlcat.c

   1 /*
   2  * rlcat - cat(1) using readline
   3  *
   4  * usage: rlcat
   5  */
   6
   7 /* Copyright (C) 1987-2002 Free Software Foundation, Inc.
   8
   9    This file is part of the GNU Readline Library, a library for
  10    reading lines of text with interactive input and history editing.
  11
  12    The GNU Readline Library is free software; you can redistribute it
  13    and/or modify it under the terms of the GNU General Public License
  14    as published by the Free Software Foundation; either version 2, or
  15    (at your option) any later version.
  16
  17    The GNU Readline Library is distributed in the hope that it will be
  18    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  19    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    The GNU General Public License is often shipped with GNU software, and
  23    is generally kept in a file called COPYING or LICENSE.  If you do not
  24    have a copy of the license, write to the Free Software Foundation,
  25    59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  26
  27 #if defined (HAVE_CONFIG_H)
  28 #  include <config.h>
  29 #endif
  30
  31 #ifdef HAVE_UNISTD_H
  32 #  include <unistd.h>
  33 #endif
  34
  35 #include <sys/types.h>
  36 #include "posixstat.h"
  37
  38 #include <stdio.h>
  39 #include <ctype.h>
  40 #include <string.h>
  41 #include <errno.h>
  42
  43 #ifndef errno
  44 extern int errno;
  45 #endif
  46
  47 #if defined (READLINE_LIBRARY)
  48 #  include "readline.h"
  49 #  include "history.h"
  50 #else
  51 #  include <readline/readline.h>
  52 #  include <readline/history.h>
  53 #endif
  54
  55 extern int optind;
  56 extern char *optarg;
  57
  58 static int stdcat();
  59
  60 static char *progname;
  61 static int vflag;
  62
  63 static void
  64 usage()
  65 {
  66   fprintf (stderr, "%s: usage: %s [-vEVN] [filename]\n", progname, progname);
  67 }
  68
  69 int
  70 main (argc, argv)
  71      int argc;
  72      char **argv;
  73 {
  74   char *temp;
  75   int opt, Vflag, Nflag;
  76
  77   progname = strrchr(argv[0], '/');
  78   if (progname == 0)
  79     progname = argv[0];
  80   else
  81     progname++;
  82
  83   vflag = Vflag = Nflag = 0;
  84   while ((opt = getopt(argc, argv, "vEVN")) != EOF)
  85     {
  86       switch (opt)
  87         {
  88         case 'v':
  89           vflag = 1;
  90           break;
  91         case 'V':
  92           Vflag = 1;
  93           break;
  94         case 'E':
  95           Vflag = 0;
  96           break;
  97         case 'N':
  98           Nflag = 1;
  99           break;
 100         default:
 101           usage ();
 102           exit (2);
 103         }
 104     }
 105
 106   argc -= optind;
 107   argv += optind;
 108
 109   if (isatty(0) == 0 || argc || Nflag)
 110     return stdcat(argc, argv);
 111
 112   rl_variable_bind ("editing-mode", Vflag ? "vi" : "emacs");
 113   while (temp = readline (""))
 114     {
 115       if (*temp)
 116         add_history (temp);
 117       printf ("%s\n", temp);
 118     }
 119
 120   return (ferror (stdout));
 121 }
 122
 123 static int
 124 fcopy(fp)
 125      FILE *fp;
 126 {
 127   int c;
 128   char *x;
 129
 130   while ((c = getc(fp)) != EOF)
 131     {
 132       if (vflag && isascii ((unsigned char)c) && isprint((unsigned char)c) == 0)
 133         {
 134           x = rl_untranslate_keyseq (c);
 135           if (fputs (x, stdout) != 0)
 136             return 1;
 137         }
 138       else if (putchar (c) == EOF)
 139         return 1;
 140     }
 141   return (ferror (stdout));
 142 }
 143
 144 int
 145 stdcat (argc, argv)
 146      int argc;
 147      char **argv;
 148 {
 149   int  i, fd, r;
 150   char *s;
 151   FILE *fp;
 152
 153   if (argc == 0)
 154     return (fcopy(stdin));
 155
 156   for (i = 0, r = 1; i < argc; i++)
 157     {
 158       if (*argv[i] == '-' && argv[i][1] == 0)
 159         fp = stdin;
 160       else
 161         {
 162           fp = fopen (argv[i], "r");
 163           if (fp == 0)
 164             {
 165               fprintf (stderr, "%s: %s: cannot open: %s\n", progname, argv[i], strerror(errno));
 166               continue;
 167             }
 168         }
 169       r = fcopy (fp);
 170       if (fp != stdin)
 171         fclose(fp);
 172     }
 173   return r;
 174 }