builtins/gen-helpfiles.c

   1 /* gen-helpfiles - create files containing builtin help text */
   2
   3 /* Copyright (C) 2012-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bush, the Bourne Again SHell.
   6
   7    Bush is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bush is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bush.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /* This links with a specially-generated version of builtins.c and takes
  22    the long_doc members of each struct builtin element and writes those to
  23    the file named by the `handle' member of the struct builtin element. */
  24
  25 #if !defined (CROSS_COMPILING)
  26 #  include <config.h>
  27 #else   /* CROSS_COMPILING */
  28 /* A conservative set of defines based on POSIX/SUS3/XPG6 */
  29 #  define HAVE_UNISTD_H
  30 #  define HAVE_STRING_H
  31 #  define HAVE_STDLIB_H
  32
  33 #  define HAVE_RENAME
  34 #endif /* CROSS_COMPILING */
  35
  36 #if defined (HAVE_UNISTD_H)
  37 #  ifdef _MINIX
  38 #    include <sys/types.h>
  39 #  endif
  40 #  include <unistd.h>
  41 #endif
  42
  43 #ifndef _MINIX
  44 #  include "../src/bushtypes.h"
  45 #  if defined (HAVE_SYS_FILE_H)
  46 #    include <sys/file.h>
  47 #  endif
  48 #endif
  49
  50 #include "posixstat.h"
  51 #include "filecntl.h"
  52
  53 #include "../src/bushansi.h"
  54 #include <stdio.h>
  55 #include <errno.h>
  56
  57 #include "stdc.h"
  58
  59 #include "../src/builtins.h"
  60 #include "tmpbuiltins.h"
  61
  62 #if defined (USING_BUSH_MALLOC)
  63 #undef xmalloc
  64 #undef xrealloc
  65 #undef xfree
  66
  67 #undef free             /* defined in xmalloc.h */
  68 #endif
  69
  70 #ifndef errno
  71 extern int errno;
  72 #endif
  73
  74 #if !defined (__STDC__) && !defined (strcpy)
  75 extern char *strcpy ();
  76 #endif /* !__STDC__ && !strcpy */
  77
  78 #define whitespace(c) (((c) == ' ') || ((c) == '\t'))
  79
  80 /* Flag values that builtins can have. */
  81 #define BUILTIN_FLAG_SPECIAL    0x01
  82 #define BUILTIN_FLAG_ASSIGNMENT 0x02
  83 #define BUILTIN_FLAG_POSIX_BUILTIN 0x04
  84
  85 #define BASE_INDENT     4
  86
  87 /* Non-zero means to produce separate help files for each builtin, named by
  88    the builtin name, in `./helpfiles'. */
  89 int separate_helpfiles = 0;
  90
  91 /* Non-zero means to create single C strings for each `longdoc', with
  92    embedded newlines, for ease of translation. */
  93 int single_longdoc_strings = 1;
  94
  95 /* The name of a directory into which the separate external help files will
  96    eventually be installed. */
  97 char *helpfile_directory;
  98
  99 /* Forward declarations. */
 100
 101 int write_helpfiles PARAMS((struct builtin *));
 102
 103 /* For each file mentioned on the command line, process it and
 104    write the information to STRUCTFILE and EXTERNFILE, while
 105    creating the production file if necessary. */
 106 int
 107 main (argc, argv)
 108      int argc;
 109      char **argv;
 110 {
 111   int arg_index = 1;
 112
 113   while (arg_index < argc && argv[arg_index][0] == '-')
 114     {
 115       char *arg = argv[arg_index++];
 116
 117       if (strcmp (arg, "-noproduction") == 0)
 118         ;
 119       else if (strcmp (arg, "-H") == 0)
 120         helpfile_directory = argv[arg_index++];
 121       else if (strcmp (arg, "-S") == 0)
 122         single_longdoc_strings = 0;
 123       else
 124         {
 125           fprintf (stderr, "%s: Unknown flag %s.\n", argv[0], arg);
 126           exit (2);
 127         }
 128     }
 129
 130   write_helpfiles(shell_builtins);
 131
 132   exit (0);
 133 }
 134
 135 /* Write DOCUMENTATION to STREAM, perhaps surrounding it with double-quotes
 136    and quoting special characters in the string.  Handle special things for
 137    internationalization (gettext) and the single-string vs. multiple-strings
 138    issues. */
 139 void
 140 write_documentation (stream, documentation, indentation)
 141      FILE *stream;
 142      char *documentation;
 143      int indentation;
 144 {
 145   if (stream == 0)
 146     return;
 147
 148   if (documentation)
 149     fprintf (stream, "%*s%s\n", indentation, " ", documentation);
 150 }
 151
 152 int
 153 write_helpfiles (builtins)
 154      struct builtin *builtins;
 155 {
 156   char *helpfile, *bname, *fname;
 157   FILE *helpfp;
 158   int i, hdlen;
 159   struct builtin b;
 160
 161   i = mkdir ("helpfiles", 0777);
 162   if (i < 0 && errno != EEXIST)
 163     {
 164       fprintf (stderr, "write_helpfiles: helpfiles: cannot create directory\n");
 165       return -1;
 166     }
 167
 168   hdlen = strlen ("helpfiles/");
 169   for (i = 0; i < num_shell_builtins; i++)
 170     {
 171       b = builtins[i];
 172
 173       fname = (char *)b.handle;
 174       helpfile = (char *)malloc (hdlen + strlen (fname) + 1);
 175       if (helpfile == 0)
 176         {
 177           fprintf (stderr, "gen-helpfiles: cannot allocate memory\n");
 178           exit (1);
 179         }
 180       sprintf (helpfile, "helpfiles/%s", fname);
 181
 182       helpfp = fopen (helpfile, "w");
 183       if (helpfp == 0)
 184         {
 185           fprintf (stderr, "write_helpfiles: cannot open %s\n", helpfile);
 186           free (helpfile);
 187           continue;
 188         }
 189
 190       write_documentation (helpfp, b.long_doc[0], 4);
 191
 192       fflush (helpfp);
 193       fclose (helpfp);
 194       free (helpfile);
 195     }
 196   return 0;
 197 }