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- /* Record indices of function doc strings stored in a file.
- Copyright (C) 1985, 1986, 1993 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 <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
-
- #include "lisp.h"
- #include "buffer.h"
- #include "keyboard.h"
-
- 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 (Vdata_directory) != Lisp_String
- || XTYPE (Vdoc_file_name) != Lisp_String)
- return Qnil;
-
- name = (char *) alloca (XSTRING (Vdata_directory)->size
- + XSTRING (Vdoc_file_name)->size + 8);
- strcpy (name, XSTRING (Vdata_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, 2, 0,
- "Return the documentation string of FUNCTION.\n\
- Unless a non-nil second argument is given, the\n\
- string is passed through `substitute-command-keys'.")
- (function, raw)
- Lisp_Object function, raw;
- {
- Lisp_Object fun;
- Lisp_Object funcar;
- Lisp_Object tem, doc;
-
- fun = Findirect_function (function);
-
- switch (XTYPE (fun))
- {
- case Lisp_Subr:
- if (XSUBR (fun)->doc == 0) return Qnil;
- if ((int) XSUBR (fun)->doc >= 0)
- doc = build_string (XSUBR (fun)->doc);
- else
- doc = get_doc_string (- (int) XSUBR (fun)->doc);
- break;
-
- case Lisp_Compiled:
- if (XVECTOR (fun)->size <= COMPILED_DOC_STRING)
- return Qnil;
- tem = XVECTOR (fun)->contents[COMPILED_DOC_STRING];
- if (XTYPE (tem) == Lisp_String)
- doc = tem;
- else if (XTYPE (tem) == Lisp_Int && XINT (tem) >= 0)
- doc = get_doc_string (XFASTINT (tem));
- else
- return Qnil;
- break;
-
- case Lisp_String:
- case Lisp_Vector:
- return build_string ("Keyboard macro.");
-
- case Lisp_Cons:
- funcar = Fcar (fun);
- if (XTYPE (funcar) != Lisp_Symbol)
- return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
- else if (EQ (funcar, Qkeymap))
- return build_string ("Prefix command (definition is a keymap associating keystrokes with\n\
- subcommands.)");
- else if (EQ (funcar, Qlambda)
- || EQ (funcar, Qautoload))
- {
- tem = Fcar (Fcdr (Fcdr (fun)));
- if (XTYPE (tem) == Lisp_String)
- doc = tem;
- else if (XTYPE (tem) == Lisp_Int && XINT (tem) >= 0)
- doc = get_doc_string (XFASTINT (tem));
- else
- return Qnil;
-
- break;
- }
- else if (EQ (funcar, Qmocklisp))
- return Qnil;
- else if (EQ (funcar, Qmacro))
- return Fdocumentation (Fcdr (fun), raw);
-
- /* Fall through to the default to report an error. */
-
- default:
- return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
- }
-
- if (NILP (raw))
- {
- struct gcpro gcpro1;
-
- GCPRO1 (doc);
- doc = Fsubstitute_command_keys (doc);
- UNGCPRO;
- }
- return doc;
- }
-
- DEFUN ("documentation-property", Fdocumentation_property, Sdocumentation_property, 2, 2, 0,
- "Return the documentation string that is SYMBOL's PROP property.\n\
- This is like `get', but it can refer to strings stored in the\n\
- `etc/DOC' file; and if the value is a string, it is passed through\n\
- `substitute-command-keys'. A non-nil third argument avoids this\n\
- translation.")
- (sym, prop, raw)
- Lisp_Object sym, prop, raw;
- {
- register Lisp_Object tem;
-
- tem = Fget (sym, prop);
- if (XTYPE (tem) == Lisp_Int)
- tem = get_doc_string (XINT (tem) > 0 ? XINT (tem) : - XINT (tem));
- if (NILP (raw) && XTYPE (tem) == Lisp_String)
- return Fsubstitute_command_keys (tem);
- return tem;
- }
-
- /* Scanning the DOC files and placing docstring offsets into functions. */
-
- static void
- store_function_docstring (fun, offset)
- Lisp_Object fun;
- int offset;
- {
- fun = indirect_function (fun);
-
- /* The type determines where the docstring is stored. */
-
- /* Lisp_Subrs have a slot for it. */
- if (XTYPE (fun) == Lisp_Subr)
- XSUBR (fun)->doc = (char *) - offset;
-
- /* If it's a lisp form, stick it in the form. */
- else if (CONSP (fun))
- {
- Lisp_Object tem;
-
- 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) = offset;
- }
- else if (EQ (tem, Qmacro))
- store_function_docstring (XCONS (fun)->cdr, offset);
- }
-
- /* Bytecode objects sometimes have slots for it. */
- else if (XTYPE (fun) == Lisp_Compiled)
- {
- /* This bytecode object must have a slot for the
- docstring, since we've found a docstring for it. */
- if (XVECTOR (fun)->size <= COMPILED_DOC_STRING)
- abort ();
-
- XFASTINT (XVECTOR (fun)->contents[COMPILED_DOC_STRING]) = offset;
- }
- }
-
-
- 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 `data-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 ();
-
- #ifndef CANNOT_DUMP
- if (NILP (Vpurify_flag))
- error ("Snarf-documentation can only be called in an undumped Emacs");
- #endif
-
- CHECK_STRING (filename, 0);
-
- #ifndef CANNOT_DUMP
- name = (char *) alloca (XSTRING (filename)->size + 14);
- strcpy (name, "../etc/");
- #else /* CANNOT_DUMP */
- CHECK_STRING (Vdata_directory, 0);
- name = (char *) alloca (XSTRING (filename)->size +
- XSTRING (Vdata_directory)->size + 1);
- strcpy (name, XSTRING (Vdata_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)
- {
- /* Attach a docstring to a variable? */
- 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)));
- }
-
- /* Attach a docstring to a function? */
- else if (p[1] == 'F')
- store_function_docstring (sym, 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,
- "Substitute key descriptions for command names in STRING.\n\
- Return a new string which is 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 the form \\=\\<MAPVAR> specify to use the value of MAPVAR\n\
- as the keymap for future \\=\\[COMMAND] substrings.\n\
- \\=\\= quotes the following character and is discarded;\n\
- thus, \\=\\=\\=\\= puts \\=\\= into the output, and \\=\\=\\=\\[ puts \\=\\[ into the output.")
- (str)
- Lisp_Object str;
- {
- unsigned char *buf;
- int changed = 0;
- register unsigned char *strp;
- register unsigned char *bufp;
- int idx;
- int bsize;
- unsigned char *new;
- Lisp_Object tem;
- Lisp_Object keymap;
- unsigned char *start;
- int length;
- Lisp_Object name;
- struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
-
- if (NILP (str))
- return Qnil;
-
- CHECK_STRING (str, 0);
- tem = Qnil;
- keymap = Qnil;
- name = Qnil;
- GCPRO4 (str, tem, keymap, name);
-
- keymap = current_buffer->keymap;
-
- bsize = XSTRING (str)->size;
- bufp = buf = (unsigned char *) xmalloc (bsize);
-
- strp = (unsigned char *) XSTRING (str)->data;
- while (strp < (unsigned char *) XSTRING (str)->data + XSTRING (str)->size)
- {
- if (strp[0] == '\\' && strp[1] == '=')
- {
- /* \= quotes the next character;
- thus, to put in \[ without its special meaning, use \=\[. */
- changed = 1;
- *bufp++ = strp[2];
- strp += 3;
- }
- else if (strp[0] == '\\' && strp[1] == '[')
- {
- changed = 1;
- strp += 2; /* skip \[ */
- start = strp;
-
- while ((strp - (unsigned char *) XSTRING (str)->data
- < XSTRING (str)->size)
- && *strp != ']')
- strp++;
- length = strp - start;
- strp++; /* skip ] */
-
- /* Save STRP in IDX. */
- idx = strp - (unsigned char *) XSTRING (str)->data;
- tem = Fintern (make_string (start, length), Qnil);
- tem = Fwhere_is_internal (tem, keymap, Qnil, Qt, Qnil);
-
- if (NILP (tem)) /* but not on any keys */
- {
- new = (unsigned char *) xrealloc (buf, bsize += 4);
- bufp += new - buf;
- buf = new;
- bcopy ("M-x ", bufp, 4);
- bufp += 4;
- goto subst;
- }
- else
- { /* function is on a key */
- tem = Fkey_description (tem);
- goto subst_string;
- }
- }
- /* \{foo} is replaced with a summary of the keymap (symbol-value foo).
- \<foo> just sets the keymap used for \[cmd]. */
- else if (strp[0] == '\\' && (strp[1] == '{' || strp[1] == '<'))
- {
- struct buffer *oldbuf;
-
- changed = 1;
- strp += 2; /* skip \{ or \< */
- start = strp;
-
- while ((strp - (unsigned char *) XSTRING (str)->data
- < XSTRING (str)->size)
- && *strp != '}' && *strp != '>')
- strp++;
- length = strp - start;
- strp++; /* skip } or > */
-
- /* Save STRP in IDX. */
- idx = strp - (unsigned char *) XSTRING (str)->data;
-
- /* Get the value of the keymap in TEM, or nil if undefined.
- Do this while still in the user's current buffer
- in case it is a local variable. */
- name = Fintern (make_string (start, length), Qnil);
- tem = Fboundp (name);
- if (! NILP (tem))
- {
- tem = Fsymbol_value (name);
- if (! NILP (tem))
- tem = get_keymap_1 (tem, 0, 1);
- }
-
- /* Now switch to a temp buffer. */
- oldbuf = current_buffer;
- set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
-
- if (NILP (tem))
- {
- name = Fsymbol_name (name);
- insert_string ("\nUses keymap \"");
- insert_from_string (name, 0, XSTRING (name)->size);
- insert_string ("\", which is not currently defined.\n");
- if (start[-1] == '<') keymap = Qnil;
- }
- else if (start[-1] == '<')
- keymap = tem;
- else
- describe_map_tree (tem, 1, Qnil, Qnil, 0);
- tem = Fbuffer_string ();
- Ferase_buffer ();
- set_buffer_internal (oldbuf);
-
- subst_string:
- start = XSTRING (tem)->data;
- length = XSTRING (tem)->size;
- subst:
- new = (unsigned char *) xrealloc (buf, bsize += length);
- bufp += new - buf;
- buf = new;
- bcopy (start, bufp, length);
- bufp += length;
- /* Check STR again in case gc relocated it. */
- strp = (unsigned char *) XSTRING (str)->data + idx;
- }
- else /* just copy other chars */
- *bufp++ = *strp++;
- }
-
- if (changed) /* don't bother if nothing substituted */
- tem = make_string (buf, bufp - buf);
- else
- tem = str;
- xfree (buf);
- RETURN_UNGCPRO (tem);
- }
-
- syms_of_doc ()
- {
- DEFVAR_LISP ("internal-doc-file-name", &Vdoc_file_name,
- "Name of file containing documentation strings of built-in symbols.");
- Vdoc_file_name = Qnil;
-
- defsubr (&Sdocumentation);
- defsubr (&Sdocumentation_property);
- defsubr (&Ssnarf_documentation);
- defsubr (&Ssubstitute_command_keys);
- }
-