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doc.c
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1991-12-02
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435 lines
/* Record indices of function doc strings stored in a file.
Copyright (C) 1985, 1986 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "config.h"
#include "lisp.h"
#include "buffer.h"
#include <sys/types.h>
#include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/
#ifdef USG5
#include <fcntl.h>
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
Lisp_Object Vdoc_file_name;
Lisp_Object
get_doc_string (filepos)
long filepos;
{
char buf[512 * 32 + 1];
register int fd;
register char *name;
register char *p, *p1;
register int count;
extern char *index ();
if (XTYPE (Vexec_directory) != Lisp_String
|| XTYPE (Vdoc_file_name) != Lisp_String)
return Qnil;
name = (char *) alloca (XSTRING (Vexec_directory)->size
+ XSTRING (Vdoc_file_name)->size + 8);
strcpy (name, XSTRING (Vexec_directory)->data);
strcat (name, XSTRING (Vdoc_file_name)->data);
#ifdef VMS
#ifndef VMS4_4
/* For VMS versions with limited file name syntax,
convert the name to something VMS will allow. */
p = name;
while (*p)
{
if (*p == '-')
*p = '_';
p++;
}
#endif /* not VMS4_4 */
#ifdef VMS4_4
strcpy (name, sys_translate_unix (name));
#endif /* VMS4_4 */
#endif /* VMS */
fd = open (name, O_RDONLY, 0);
if (fd < 0)
error ("Cannot open doc string file \"%s\"", name);
if (0 > lseek (fd, filepos, 0))
{
close (fd);
error ("Position %ld out of range in doc string file \"%s\"",
filepos, name);
}
p = buf;
while (p != buf + sizeof buf - 1)
{
count = read (fd, p, 512);
p[count] = 0;
if (!count)
break;
p1 = index (p, '\037');
if (p1)
{
*p1 = 0;
p = p1;
break;
}
p += count;
}
close (fd);
return make_string (buf, p - buf);
}
DEFUN ("documentation", Fdocumentation, Sdocumentation, 1, 1, 0,
"Return the documentation string of FUNCTION.")
(fun1)
Lisp_Object fun1;
{
Lisp_Object fun;
Lisp_Object funcar;
Lisp_Object tem;
fun = fun1;
while (XTYPE (fun) == Lisp_Symbol)
fun = Fsymbol_function (fun);
if (XTYPE (fun) == Lisp_Subr)
{
if (XSUBR (fun)->doc == 0) return Qnil;
if ((int) XSUBR (fun)->doc >= 0)
return Fsubstitute_command_keys (build_string (XSUBR (fun)->doc));
return Fsubstitute_command_keys (get_doc_string (- (int) XSUBR (fun)->doc));
}
if (XTYPE (fun) == Lisp_Vector)
return build_string ("Prefix command (definition is a Lisp vector of subcommands).");
if (XTYPE (fun) == Lisp_String)
return build_string ("Keyboard macro.");
if (!CONSP (fun))
return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
funcar = Fcar (fun);
if (XTYPE (funcar) != Lisp_Symbol)
return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
if (XSYMBOL (funcar) == XSYMBOL (Qkeymap))
return build_string ("Prefix command (definition is a list whose cdr is an alist of subcommands.)");
if (XSYMBOL (funcar) == XSYMBOL (Qlambda)
|| XSYMBOL (funcar) == XSYMBOL (Qautoload))
{
tem = Fcar (Fcdr (Fcdr (fun)));
if (XTYPE (tem) == Lisp_String)
return Fsubstitute_command_keys (tem);
if (XTYPE (tem) == Lisp_Int && XINT (tem) >= 0)
return Fsubstitute_command_keys (get_doc_string (XFASTINT (tem)));
return Qnil;
}
if (XSYMBOL (funcar) == XSYMBOL (Qmocklisp))
return Qnil;
if (XSYMBOL (funcar) == XSYMBOL (Qmacro))
return Fdocumentation (Fcdr (fun));
else
return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
}
DEFUN ("documentation-property", Fdocumentation_property,
Sdocumentation_property, 2, 2, 0,
"Return the documentation string that is SYMBOL's PROP property.\n\
This differs from using `get' only in that it can refer to strings\n\
stored in the etc/DOC file.")
(sym, prop)
Lisp_Object sym, prop;
{
register Lisp_Object tem;
tem = Fget (sym, prop);
if (XTYPE (tem) == Lisp_Int)
tem = get_doc_string (XINT (tem) > 0 ? XINT (tem) : - XINT (tem));
return Fsubstitute_command_keys (tem);
}
DEFUN ("Snarf-documentation", Fsnarf_documentation, Ssnarf_documentation,
1, 1, 0,
"Used during Emacs initialization, before dumping runnable Emacs,\n\
to find pointers to doc strings stored in etc/DOC... and\n\
record them in function definitions.\n\
One arg, FILENAME, a string which does not include a directory.\n\
The file is found in ../etc now; found in the exec-directory\n\
when doc strings are referred to later in the dumped Emacs.")
(filename)
Lisp_Object filename;
{
int fd;
char buf[1024 + 1];
register int filled;
register int pos;
register char *p, *end;
Lisp_Object sym, fun, tem;
char *name;
extern char *index ();
CHECK_STRING (filename, 0);
#ifndef CANNOT_DUMP
name = (char *) alloca (XSTRING (filename)->size + 8);
strcpy (name, "../etc/");
#else /* CANNOT_DUMP */
CHECK_STRING (Vexec_directory, 0);
name = (char *) alloca (XSTRING (filename)->size +
XSTRING (Vexec_directory)->size + 1);
strcpy (name, XSTRING (Vexec_directory)->data);
#endif /* CANNOT_DUMP */
strcat (name, XSTRING (filename)->data); /*** Add this line ***/
#ifdef VMS
#ifndef VMS4_4
/* For VMS versions with limited file name syntax,
convert the name to something VMS will allow. */
p = name;
while (*p)
{
if (*p == '-')
*p = '_';
p++;
}
#endif /* not VMS4_4 */
#ifdef VMS4_4
strcpy (name, sys_translate_unix (name));
#endif /* VMS4_4 */
#endif /* VMS */
fd = open (name, O_RDONLY, 0);
if (fd < 0)
report_file_error ("Opening doc string file",
Fcons (build_string (name), Qnil));
Vdoc_file_name = filename;
filled = 0;
pos = 0;
while (1)
{
if (filled < 512)
filled += read (fd, &buf[filled], sizeof buf - 1 - filled);
if (!filled)
break;
buf[filled] = 0;
p = buf;
end = buf + (filled < 512 ? filled : filled - 128);
while (p != end && *p != '\037') p++;
/* p points to ^_Ffunctionname\n or ^_Vvarname\n. */
if (p != end)
{
end = index (p, '\n');
sym = oblookup (Vobarray, p + 2, end - p - 2);
if (XTYPE (sym) == Lisp_Symbol)
{
if (p[1] == 'V')
{
/* Install file-position as variable-documentation property
and make it negative for a user-variable
(doc starts with a `*'). */
Fput (sym, Qvariable_documentation,
make_number ((pos + end + 1 - buf)
* (end[1] == '*' ? -1 : 1)));
}
else if (p[1] == 'F')
{
fun = XSYMBOL (sym)->function;
if (XTYPE (fun) == Lisp_Subr)
XSUBR (fun)->doc = (char *) - (pos + end + 1 - buf);
else if (CONSP (fun))
{
tem = XCONS (fun)->car;
if (EQ (tem, Qlambda) || EQ (tem, Qautoload))
{
tem = Fcdr (Fcdr (fun));
if (CONSP (tem) &&
XTYPE (XCONS (tem)->car) == Lisp_Int)
XFASTINT (XCONS (tem)->car) = (pos + end + 1 - buf);
}
}
}
else error ("DOC file invalid at position %d", pos);
}
}
pos += end - buf;
filled -= end - buf;
bcopy (end, buf, filled);
}
close (fd);
return Qnil;
}
DEFUN ("substitute-command-keys", Fsubstitute_command_keys,
Ssubstitute_command_keys, 1, 1, 0,
"Return the STRING with substrings of the form \\=\\[COMMAND]\n\
replaced by either: a keystroke sequence that will invoke COMMAND,\n\
or \"M-x COMMAND\" if COMMAND is not on any keys.\n\
Substrings of the form \\=\\{MAPVAR} are replaced by summaries\n\
\(made by describe-bindings) of the value of MAPVAR, taken as a keymap.\n\
Substrings of t