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- /* Lisp parsing and input streams.
- Copyright (C) 1985, 1986, 1987, 1988, 1989,
- 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 2, 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 <stdio.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/file.h>
- #include <ctype.h>
- #include "config.h"
- #include "lisp.h"
-
- #ifndef standalone
- #include "buffer.h"
- #include "paths.h"
- #include "commands.h"
- #include "keyboard.h"
- #include "termhooks.h"
- #endif
-
- #ifdef lint
- #include <sys/inode.h>
- #endif /* lint */
-
- #ifndef X_OK
- #define X_OK 01
- #endif
-
- #ifdef LISP_FLOAT_TYPE
- #ifdef STDC_HEADERS
- #include <stdlib.h>
- #endif
- #include <math.h>
- #endif /* LISP_FLOAT_TYPE */
-
- Lisp_Object Qread_char, Qget_file_char, Qstandard_input, Qcurrent_load_list;
- Lisp_Object Qvariable_documentation, Vvalues, Vstandard_input, Vafter_load_alist;
- Lisp_Object Qascii_character, Qload;
-
- extern Lisp_Object Qevent_symbol_element_mask;
-
- /* non-zero if inside `load' */
- int load_in_progress;
-
- /* Search path for files to be loaded. */
- Lisp_Object Vload_path;
-
- /* This is the user-visible association list that maps features to
- lists of defs in their load files. */
- Lisp_Object Vload_history;
-
- /* This is useud to build the load history. */
- Lisp_Object Vcurrent_load_list;
-
- /* File for get_file_char to read from. Use by load */
- static FILE *instream;
-
- /* When nonzero, read conses in pure space */
- static int read_pure;
-
- /* For use within read-from-string (this reader is non-reentrant!!) */
- static int read_from_string_index;
- static int read_from_string_limit;
-
- /* Handle unreading and rereading of characters.
- Write READCHAR to read a character,
- UNREAD(c) to unread c to be read again. */
-
- #define READCHAR readchar (readcharfun)
- #define UNREAD(c) unreadchar (readcharfun, c)
-
- static int
- readchar (readcharfun)
- Lisp_Object readcharfun;
- {
- Lisp_Object tem;
- register struct buffer *inbuffer;
- register int c, mpos;
-
- if (XTYPE (readcharfun) == Lisp_Buffer)
- {
- inbuffer = XBUFFER (readcharfun);
-
- if (BUF_PT (inbuffer) >= BUF_ZV (inbuffer))
- return -1;
- c = *(unsigned char *) BUF_CHAR_ADDRESS (inbuffer, BUF_PT (inbuffer));
- SET_BUF_PT (inbuffer, BUF_PT (inbuffer) + 1);
-
- return c;
- }
- if (XTYPE (readcharfun) == Lisp_Marker)
- {
- inbuffer = XMARKER (readcharfun)->buffer;
-
- mpos = marker_position (readcharfun);
-
- if (mpos > BUF_ZV (inbuffer) - 1)
- return -1;
- c = *(unsigned char *) BUF_CHAR_ADDRESS (inbuffer, mpos);
- if (mpos != BUF_GPT (inbuffer))
- XMARKER (readcharfun)->bufpos++;
- else
- Fset_marker (readcharfun, make_number (mpos + 1),
- Fmarker_buffer (readcharfun));
- return c;
- }
- if (EQ (readcharfun, Qget_file_char))
- return getc (instream);
-
- if (XTYPE (readcharfun) == Lisp_String)
- {
- register int c;
- /* This used to be return of a conditional expression,
- but that truncated -1 to a char on VMS. */
- if (read_from_string_index < read_from_string_limit)
- c = XSTRING (readcharfun)->data[read_from_string_index++];
- else
- c = -1;
- return c;
- }
-
- tem = call0 (readcharfun);
-
- if (NILP (tem))
- return -1;
- return XINT (tem);
- }
-
- /* Unread the character C in the way appropriate for the stream READCHARFUN.
- If the stream is a user function, call it with the char as argument. */
-
- static void
- unreadchar (readcharfun, c)
- Lisp_Object readcharfun;
- int c;
- {
- if (XTYPE (readcharfun) == Lisp_Buffer)
- {
- if (XBUFFER (readcharfun) == current_buffer)
- SET_PT (point - 1);
- else
- SET_BUF_PT (XBUFFER (readcharfun), BUF_PT (XBUFFER (readcharfun)) - 1);
- }
- else if (XTYPE (readcharfun) == Lisp_Marker)
- XMARKER (readcharfun)->bufpos--;
- else if (XTYPE (readcharfun) == Lisp_String)
- read_from_string_index--;
- else if (EQ (readcharfun, Qget_file_char))
- ungetc (c, instream);
- else
- call1 (readcharfun, make_number (c));
- }
-
- static Lisp_Object read0 (), read1 (), read_list (), read_vector ();
-
- /* get a character from the tty */
-
- extern Lisp_Object read_char ();
-
- /* Read input events until we get one that's acceptable for our purposes.
-
- If NO_SWITCH_FRAME is non-zero, switch-frame events are stashed
- until we get a character we like, and then stuffed into
- unread_switch_frame.
-
- If ASCII_REQUIRED is non-zero, we check function key events to see
- if the unmodified version of the symbol has a Qascii_character
- property, and use that character, if present.
-
- If ERROR_NONASCII is non-zero, we signal an error if the input we
- get isn't an ASCII character with modifiers. If it's zero but
- ASCII_REQUIRED is non-zero, we just re-read until we get an ASCII
- character. */
- Lisp_Object
- read_filtered_event (no_switch_frame, ascii_required, error_nonascii)
- int no_switch_frame, ascii_required, error_nonascii;
- {
- #ifdef standalone
- return make_number (getchar ());
- #else
- register Lisp_Object val;
- register Lisp_Object delayed_switch_frame = Qnil;
-
- /* Read until we get an acceptable event. */
- retry:
- val = read_char (0, 0, 0, Qnil, 0);
-
- /* switch-frame events are put off until after the next ASCII
- character. This is better than signalling an error just because
- the last characters were typed to a separate minibuffer frame,
- for example. Eventually, some code which can deal with
- switch-frame events will read it and process it. */
- if (no_switch_frame
- && EVENT_HAS_PARAMETERS (val)
- && EQ (EVENT_HEAD (val), Qswitch_frame))
- {
- delayed_switch_frame = val;
- goto retry;
- }
-
- if (ascii_required)
- {
- /* Convert certain symbols to their ASCII equivalents. */
- if (XTYPE (val) == Lisp_Symbol)
- {
- Lisp_Object tem, tem1, tem2;
- tem = Fget (val, Qevent_symbol_element_mask);
- if (!NILP (tem))
- {
- tem1 = Fget (Fcar (tem), Qascii_character);
- /* Merge this symbol's modifier bits
- with the ASCII equivalent of its basic code. */
- if (!NILP (tem1))
- XFASTINT (val) = XINT (tem1) | XINT (Fcar (Fcdr (tem)));
- }
- }
-
- /* If we don't have a character now, deal with it appropriately. */
- if (XTYPE (val) != Lisp_Int)
- {
- if (error_nonascii)
- {
- unread_command_events = Fcons (val, Qnil);
- error ("Non-character input-event");
- }
- else
- goto retry;
- }
- }
-
- if (! NILP (delayed_switch_frame))
- unread_switch_frame = delayed_switch_frame;
-
- return val;
- #endif
- }
-
- DEFUN ("read-char", Fread_char, Sread_char, 0, 0, 0,
- "Read a character from the command input (keyboard or macro).\n\
- It is returned as a number.\n\
- If the user generates an event which is not a character (i.e. a mouse\n\
- click or function key event), `read-char' signals an error. As an\n\
- exception, switch-frame events are put off until non-ASCII events can\n\
- be read.\n\
- If you want to read non-character events, or ignore them, call\n\
- `read-event' or `read-char-exclusive' instead.")
- ()
- {
- return read_filtered_event (1, 1, 1);
- }
-
- DEFUN ("read-event", Fread_event, Sread_event, 0, 0, 0,
- "Read an event object from the input stream.")
- ()
- {
- return read_filtered_event (0, 0, 0);
- }
-
- DEFUN ("read-char-exclusive", Fread_char_exclusive, Sread_char_exclusive, 0, 0, 0,
- "Read a character from the command input (keyboard or macro).\n\
- It is returned as a number. Non character events are ignored.")
- ()
- {
- return read_filtered_event (1, 1, 0);
- }
-
- DEFUN ("get-file-char", Fget_file_char, Sget_file_char, 0, 0, 0,
- "Don't use this yourself.")
- ()
- {
- register Lisp_Object val;
- XSET (val, Lisp_Int, getc (instream));
- return val;
- }
-
- static void readevalloop ();
- static Lisp_Object load_unwind ();
-
- DEFUN ("load", Fload, Sload, 1, 4, 0,
- "Execute a file of Lisp code named FILE.\n\
- First try FILE with `.elc' appended, then try with `.el',\n\
- then try FILE unmodified.\n\
- This function searches the directories in `load-path'.\n\
- If optional second arg NOERROR is non-nil,\n\
- report no error if FILE doesn't exist.\n\
- Print messages at start and end of loading unless\n\
- optional third arg NOMESSAGE is non-nil.\n\
- If optional fourth arg NOSUFFIX is non-nil, don't try adding\n\
- suffixes `.elc' or `.el' to the specified name FILE.\n\
- Return t if file exists.")
- (str, noerror, nomessage, nosuffix)
- Lisp_Object str, noerror, nomessage, nosuffix;
- {
- register FILE *stream;
- register int fd = -1;
- register Lisp_Object lispstream;
- register FILE **ptr;
- int count = specpdl_ptr - specpdl;
- Lisp_Object temp;
- struct gcpro gcpro1;
- Lisp_Object found;
- /* 1 means inhibit the message at the beginning. */
- int nomessage1 = 0;
- Lisp_Object handler;
-
- CHECK_STRING (str, 0);
- str = Fsubstitute_in_file_name (str);
-
- /* If file name is magic, call the handler. */
- handler = Ffind_file_name_handler (str);
- if (!NILP (handler))
- return call5 (handler, Qload, str, noerror, nomessage, nosuffix);
-
- /* Avoid weird lossage with null string as arg,
- since it would try to load a directory as a Lisp file */
- if (XSTRING (str)->size > 0)
- {
- fd = openp (Vload_path, str, !NILP (nosuffix) ? "" : ".elc:.el:",
- &found, 0);
- }
-
- if (fd < 0)
- {
- if (NILP (noerror))
- while (1)
- Fsignal (Qfile_error, Fcons (build_string ("Cannot open load file"),
- Fcons (str, Qnil)));
- else
- return Qnil;
- }
-
- if (!bcmp (&(XSTRING (found)->data[XSTRING (found)->size - 4]),
- ".elc", 4))
- {
- struct stat s1, s2;
- int result;
-
- stat (XSTRING (found)->data, &s1);
- XSTRING (found)->data[XSTRING (found)->size - 1] = 0;
- result = stat (XSTRING (found)->data, &s2);
- if (result >= 0 && (unsigned) s1.st_mtime < (unsigned) s2.st_mtime)
- {
- message ("Source file `%s' newer than byte-compiled file",
- XSTRING (found)->data);
- /* Don't immediately overwrite this message. */
- if (!noninteractive)
- nomessage1 = 1;
- }
- XSTRING (found)->data[XSTRING (found)->size - 1] = 'c';
- }
-
- stream = fdopen (fd, "r");
- if (stream == 0)
- {
- close (fd);
- error ("Failure to create stdio stream for %s", XSTRING (str)->data);
- }
-
- if (NILP (nomessage) && !nomessage1)
- message ("Loading %s...", XSTRING (str)->data);
-
- GCPRO1 (str);
- /* We may not be able to store STREAM itself as a Lisp_Object pointer
- since that is guaranteed to work only for data that has been malloc'd.
- So malloc a full-size pointer, and record the address of that pointer. */
- ptr = (FILE **) xmalloc (sizeof (FILE *));
- *ptr = stream;
- XSET (lispstream, Lisp_Internal_Stream, (int) ptr);
- record_unwind_protect (load_unwind, lispstream);
- load_in_progress++;
- readevalloop (Qget_file_char, stream, str, Feval, 0);
- unbind_to (count, Qnil);
-
- /* Run any load-hooks for this file. */
- temp = Fassoc (str, Vafter_load_alist);
- if (!NILP (temp))
- Fprogn (Fcdr (temp));
- UNGCPRO;
-
- if (!noninteractive && NILP (nomessage))
- message ("Loading %s...done", XSTRING (str)->data);
- return Qt;
- }
-
- static Lisp_Object
- load_unwind (stream) /* used as unwind-protect function in load */
- Lisp_Object stream;
- {
- fclose (*(FILE **) XSTRING (stream));
- xfree (XPNTR (stream));
- if (--load_in_progress < 0) load_in_progress = 0;
- return Qnil;
- }
-
-
- static int
- complete_filename_p (pathname)
- Lisp_Object pathname;
- {
- register unsigned char *s = XSTRING (pathname)->data;
- return (*s == '/'
- #ifdef ALTOS
- || *s == '@'
- #endif
- #ifdef VMS
- || index (s, ':')
- #endif /* VMS */
- );
- }
-
- /* Search for a file whose name is STR, looking in directories
- in the Lisp list PATH, and trying suffixes from SUFFIX.
- SUFFIX is a string containing possible suffixes separated by colons.
- On success, returns a file descriptor. On failure, returns -1.
-
- EXEC_ONLY nonzero means don't open the files,
- just look for one that is executable. In this case,
- returns 1 on success.
-
- If STOREPTR is nonzero, it points to a slot where the name of
- the file actually found should be stored as a Lisp string.
- Nil is stored there on failure. */
-
- int
- openp (path, str, suffix, storeptr, exec_only)
- Lisp_Object path, str;
- char *suffix;
- Lisp_Object *storeptr;
- int exec_only;
- {
- register int fd;
- int fn_size = 100;
- char buf[100];
- register char *fn = buf;
- int absolute = 0;
- int want_size;
- register Lisp_Object filename;
- struct stat st;
-
- if (storeptr)
- *storeptr = Qnil;
-
- if (complete_filename_p (str))
- absolute = 1;
-
- for (; !NILP (path); path = Fcdr (path))
- {
- char *nsuffix;
-
- filename = Fexpand_file_name (str, Fcar (path));
- if (!complete_filename_p (filename))
- /* If there are non-absolute elts in PATH (eg ".") */
- /* Of course, this could conceivably lose if luser sets
- default-directory to be something non-absolute... */
- {
- filename = Fexpand_file_name (filename, current_buffer->directory);
- if (!complete_filename_p (filename))
- /* Give up on this path element! */
- continue;
- }
-
- /* Calculate maximum size of any filename made from
- this path element/specified file name and any possible suffix. */
- want_size = strlen (suffix) + XSTRING (filename)->size + 1;
- if (fn_size < want_size)
- fn = (char *) alloca (fn_size = 100 + want_size);
-
- nsuffix = suffix;
-
- /* Loop over suffixes. */
- while (1)
- {
- char *esuffix = (char *) index (nsuffix, ':');
- int lsuffix = esuffix ? esuffix - nsuffix : strlen (nsuffix);
-
- /* Concatenate path element/specified name with the suffix. */
- strncpy (fn, XSTRING (filename)->data, XSTRING (filename)->size);
- fn[XSTRING (filename)->size] = 0;
- if (lsuffix != 0) /* Bug happens on CCI if lsuffix is 0. */
- strncat (fn, nsuffix, lsuffix);
-
- /* Ignore file if it's a directory. */
- if (stat (fn, &st) >= 0
- && (st.st_mode & S_IFMT) != S_IFDIR)
- {
- /* Check that we can access or open it. */
- if (exec_only)
- fd = (access (fn, X_OK) == 0) ? 1 : -1;
- else
- fd = open (fn, 0, 0);
-
- if (fd >= 0)
- {
- /* We succeeded; return this descriptor and filename. */
- if (storeptr)
- *storeptr = build_string (fn);
- return fd;
- }
- }
-
- /* Advance to next suffix. */
- if (esuffix == 0)
- break;
- nsuffix += lsuffix + 1;
- }
- if (absolute) return -1;
- }
-
- return -1;
- }
-
-
- /* Merge the list we've accumulated of globals from the current input source
- into the load_history variable. The details depend on whether
- the source has an associated file name or not. */
-
- static void
- build_load_history (stream, source)
- FILE *stream;
- Lisp_Object source;
- {
- register Lisp_Object tail, prev, newelt;
- register Lisp_Object tem, tem2;
- register int foundit, loading;
-
- /* Don't bother recording anything for preloaded files. */
- if (!NILP (Vpurify_flag))
- return;
-
- loading = stream || !NARROWED;
-
- tail = Vload_history;
- prev = Qnil;
- foundit = 0;
- while (!NILP (tail))
- {
- tem = Fcar (tail);
-
- /* Find the feature's previous assoc list... */
- if (!NILP (Fequal (source, Fcar (tem))))
- {
- foundit = 1;
-
- /* If we're loading, remove it. */
- if (loading)
- {
- if (NILP (prev))
- Vload_history = Fcdr (tail);
- else
- Fsetcdr (prev, Fcdr (tail));
- }
-
- /* Otherwise, cons on new symbols that are not already members. */
- else
- {
- tem2 = Vcurrent_load_list;
-
- while (CONSP (tem2))
- {
- newelt = Fcar (tem2);
-
- if (NILP (Fmemq (newelt, tem)))
- Fsetcar (tail, Fcons (Fcar (tem),
- Fcons (newelt, Fcdr (tem))));
-
- tem2 = Fcdr (tem2);
- QUIT;
- }
- }
- }
- else
- prev = tail;
- tail = Fcdr (tail);
- QUIT;
- }
-
- /* If we're loading, cons the new assoc onto the front of load-history,
- the most-recently-loaded position. Also do this if we didn't find
- an existing member for the current source. */
- if (loading || !foundit)
- Vload_history = Fcons (Fnreverse (Vcurrent_load_list),
- Vload_history);
- }
-
- Lisp_Object
- unreadpure () /* Used as unwind-protect function in readevalloop */
- {
- read_pure = 0;
- return Qnil;
- }
-
- static void
- readevalloop (readcharfun, stream, sourcename, evalfun, printflag)
- Lisp_Object readcharfun;
- FILE *stream;
- Lisp_Object sourcename;
- Lisp_Object (*evalfun) ();
- int printflag;
- {
- register int c;
- register Lisp_Object val;
- int count = specpdl_ptr - specpdl;
- struct gcpro gcpro1;
-
- specbind (Qstandard_input, readcharfun);
- specbind (Qcurrent_load_list, Qnil);
-
- GCPRO1 (sourcename);
-
- LOADHIST_ATTACH (sourcename);
-
- while (1)
- {
- instream = stream;
- c = READCHAR;
- if (c == ';')
- {
- while ((c = READCHAR) != '\n' && c != -1);
- continue;
- }
- if (c < 0) break;
- if (c == ' ' || c == '\t' || c == '\n' || c == '\f') continue;
-
- if (!NILP (Vpurify_flag) && c == '(')
- {
- record_unwind_protect (unreadpure, Qnil);
- val = read_list (-1, readcharfun);
- unbind_to (count + 1, Qnil);
- }
- else
- {
- UNREAD (c);
- val = read0 (readcharfun);
- }
-
- val = (*evalfun) (val);
- if (printflag)
- {
- Vvalues = Fcons (val, Vvalues);
- if (EQ (Vstandard_output, Qt))
- Fprin1 (val, Qnil);
- else
- Fprint (val, Qnil);
- }
- }
-
- build_load_history (stream, sourcename);
- UNGCPRO;
-
- unbind_to (count, Qnil);
- }
-
- #ifndef standalone
-
- DEFUN ("eval-buffer", Feval_buffer, Seval_buffer, 0, 2, "",
- "Execute the current buffer as Lisp code.\n\
- Programs can pass two arguments, BUFFER and PRINTFLAG.\n\
- BUFFER is the buffer to evaluate (nil means use current buffer).\n\
- PRINTFLAG controls printing of output:\n\
- nil means discard it; anything else is stream for print.\n\
- \n\
- If there is no error, point does not move. If there is an error,\n\
- point remains at the end of the last character read from the buffer.")
- (bufname, printflag)
- Lisp_Object bufname, printflag;
- {
- int count = specpdl_ptr - specpdl;
- Lisp_Object tem, buf;
-
- if (NILP (bufname))
- buf = Fcurrent_buffer ();
- else
- buf = Fget_buffer (bufname);
- if (NILP (buf))
- error ("No such buffer.");
-
- if (NILP (printflag))
- tem = Qsymbolp;
- else
- tem = printflag;
- specbind (Qstandard_output, tem);
- record_unwind_protect (save_excursion_restore, save_excursion_save ());
- BUF_SET_PT (XBUFFER (buf), BUF_BEGV (XBUFFER (buf)));
- readevalloop (buf, 0, XBUFFER (buf)->filename, Feval, !NILP (printflag));
- unbind_to (count, Qnil);
-
- return Qnil;
- }
-
- #if 0
- DEFUN ("eval-current-buffer", Feval_current_buffer, Seval_current_buffer, 0, 1, "",
- "Execute the current buffer as Lisp code.\n\
- Programs can pass argument PRINTFLAG which controls printing of output:\n\
- nil means discard it; anything else is stream for print.\n\
- \n\
- If there is no error, point does not move. If there is an error,\n\
- point remains at the end of the last character read from the buffer.")
- (printflag)
- Lisp_Object printflag;
- {
- int count = specpdl_ptr - specpdl;
- Lisp_Object tem, cbuf;
-
- cbuf = Fcurrent_buffer ()
-
- if (NILP (printflag))
- tem = Qsymbolp;
- else
- tem = printflag;
- specbind (Qstandard_output, tem);
- record_unwind_protect (save_excursion_restore, save_excursion_save ());
- SET_PT (BEGV);
- readevalloop (cbuf, 0, XBUFFER (cbuf)->filename, Feval, !NILP (printflag));
- return unbind_to (count, Qnil);
- }
- #endif
-
- DEFUN ("eval-region", Feval_region, Seval_region, 2, 3, "r",
- "Execute the region as Lisp code.\n\
- When called from programs, expects two arguments,\n\
- giving starting and ending indices in the current buffer\n\
- of the text to be executed.\n\
- Programs can pass third argument PRINTFLAG which controls output:\n\
- nil means discard it; anything else is stream for printing it.\n\
- \n\
- If there is no error, point does not move. If there is an error,\n\
- point remains at the end of the last character read from the buffer.")
- (b, e, printflag)
- Lisp_Object b, e, printflag;
- {
- int count = specpdl_ptr - specpdl;
- Lisp_Object tem, cbuf;
-
- cbuf = Fcurrent_buffer ();
-
- if (NILP (printflag))
- tem = Qsymbolp;
- else
- tem = printflag;
- specbind (Qstandard_output, tem);
-
- if (NILP (printflag))
- record_unwind_protect (save_excursion_restore, save_excursion_save ());
- record_unwind_protect (save_restriction_restore, save_restriction_save ());
-
- /* This both uses b and checks its type. */
- Fgoto_char (b);
- Fnarrow_to_region (make_number (BEGV), e);
- readevalloop (cbuf, 0, XBUFFER (cbuf)->filename, Feval, !NILP (printflag));
-
- return unbind_to (count, Qnil);
- }
-
- #endif /* standalone */
-
- DEFUN ("read", Fread, Sread, 0, 1, 0,
- "Read one Lisp expression as text from STREAM, return as Lisp object.\n\
- If STREAM is nil, use the value of `standard-input' (which see).\n\
- STREAM or the value of `standard-input' may be:\n\
- a buffer (read from point and advance it)\n\
- a marker (read from where it points and advance it)\n\
- a function (call it with no arguments for each character,\n\
- call it with a char as argument to push a char back)\n\
- a string (takes text from string, starting at the beginning)\n\
- t (read text line using minibuffer and use it).")
- (readcharfun)
- Lisp_Object readcharfun;
- {
- extern Lisp_Object Fread_minibuffer ();
-
- if (NILP (readcharfun))
- readcharfun = Vstandard_input;
- if (EQ (readcharfun, Qt))
- readcharfun = Qread_char;
-
- #ifndef standalone
- if (EQ (readcharfun, Qread_char))
- return Fread_minibuffer (build_string ("Lisp expression: "), Qnil);
- #endif
-
- if (XTYPE (readcharfun) == Lisp_String)
- return Fcar (Fread_from_string (readcharfun, Qnil, Qnil));
-
- return read0 (readcharfun);
- }
-
- DEFUN ("read-from-string", Fread_from_string, Sread_from_string, 1, 3, 0,
- "Read one Lisp expression which is represented as text by STRING.\n\
- Returns a cons: (OBJECT-READ . FINAL-STRING-INDEX).\n\
- START and END optionally delimit a substring of STRING from which to read;\n\
- they default to 0 and (length STRING) respectively.")
- (string, start, end)
- Lisp_Object string, start, end;
- {
- int startval, endval;
- Lisp_Object tem;
-
- CHECK_STRING (string,0);
-
- if (NILP (end))
- endval = XSTRING (string)->size;
- else
- { CHECK_NUMBER (end,2);
- endval = XINT (end);
- if (endval < 0 || endval > XSTRING (string)->size)
- args_out_of_range (string, end);
- }
-
- if (NILP (start))
- startval = 0;
- else
- { CHECK_NUMBER (start,1);
- startval = XINT (start);
- if (startval < 0 || startval > endval)
- args_out_of_range (string, start);
- }
-
- read_from_string_index = startval;
- read_from_string_limit = endval;
-
- tem = read0 (string);
- return Fcons (tem, make_number (read_from_string_index));
- }
-
- /* Use this for recursive reads, in contexts where internal tokens are not allowed. */
-
- static Lisp_Object
- read0 (readcharfun)
- Lisp_Object readcharfun;
- {
- register Lisp_Object val;
- char c;
-
- val = read1 (readcharfun);
- if (XTYPE (val) == Lisp_Internal)
- {
- c = XINT (val);
- return Fsignal (Qinvalid_read_syntax, Fcons (make_string (&c, 1), Qnil));
- }
-
- return val;
- }
-
- static int read_buffer_size;
- static char *read_buffer;
-
- static int
- read_escape (readcharfun)
- Lisp_Object readcharfun;
- {
- register int c = READCHAR;
- switch (c)
- {
- case 'a':
- return '\007';
- case 'b':
- return '\b';
- case 'd':
- return 0177;
- case 'e':
- return 033;
- case 'f':
- return '\f';
- case 'n':
- return '\n';
- case 'r':
- return '\r';
- case 't':
- return '\t';
- case 'v':
- return '\v';
- case '\n':
- return -1;
-
- case 'M':
- c = READCHAR;
- if (c != '-')
- error ("Invalid escape character syntax");
- c = READCHAR;
- if (c == '\\')
- c = read_escape (readcharfun);
- return c | meta_modifier;
-
- case 'S':
- c = READCHAR;
- if (c != '-')
- error ("Invalid escape character syntax");
- c = READCHAR;
- if (c == '\\')
- c = read_escape (readcharfun);
- return c | shift_modifier;
-
- case 'H':
- c = READCHAR;
- if (c != '-')
- error ("Invalid escape character syntax");
- c = READCHAR;
- if (c == '\\')
- c = read_escape (readcharfun);
- return c | hyper_modifier;
-
- case 'A':
- c = READCHAR;
- if (c != '-')
- error ("Invalid escape character syntax");
- c = READCHAR;
- if (c == '\\')
- c = read_escape (readcharfun);
- return c | alt_modifier;
-
- case 's':
- c = READCHAR;
- if (c != '-')
- error ("Invalid escape character syntax");
- c = READCHAR;
- if (c == '\\')
- c = read_escape (readcharfun);
- return c | super_modifier;
-
- case 'C':
- c = READCHAR;
- if (c != '-')
- error ("Invalid escape character syntax");
- case '^':
- c = READCHAR;
- if (c == '\\')
- c = read_escape (readcharfun);
- if ((c & 0177) == '?')
- return 0177 | c;
- /* ASCII control chars are made from letters (both cases),
- as well as the non-letters within 0100...0137. */
- else if ((c & 0137) >= 0101 && (c & 0137) <= 0132)
- return (c & (037 | ~0177));
- else if ((c & 0177) >= 0100 && (c & 0177) <= 0137)
- return (c & (037 | ~0177));
- else
- return c | ctrl_modifier;
-
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- /* An octal escape, as in ANSI C. */
- {
- register int i = c - '0';
- register int count = 0;
- while (++count < 3)
- {
- if ((c = READCHAR) >= '0' && c <= '7')
- {
- i *= 8;
- i += c - '0';
- }
- else
- {
- UNREAD (c);
- break;
- }
- }
- return i;
- }
-
- case 'x':
- /* A hex escape, as in ANSI C. */
- {
- int i = 0;
- while (1)
- {
- c = READCHAR;
- if (c >= '0' && c <= '9')
- {
- i *= 16;
- i += c - '0';
- }
- else if ((c >= 'a' && c <= 'f')
- || (c >= 'A' && c <= 'F'))
- {
- i *= 16;
- if (c >= 'a' && c <= 'f')
- i += c - 'a' + 10;
- else
- i += c - 'A' + 10;
- }
- else
- {
- UNREAD (c);
- break;
- }
- }
- return i;
- }
-
- default:
- return c;
- }
- }
-
- static Lisp_Object
- read1 (readcharfun)
- register Lisp_Object readcharfun;
- {
- register int c;
-
- retry:
-
- c = READCHAR;
- if (c < 0) return Fsignal (Qend_of_file, Qnil);
-
- switch (c)
- {
- case '(':
- return read_list (0, readcharfun);
-
- case '[':
- return read_vector (readcharfun);
-
- case ')':
- case ']':
- {
- register Lisp_Object val;
- XSET (val, Lisp_Internal, c);
- return val;
- }
-
- case '#':
- c = READCHAR;
- if (c == '[')
- {
- /* Accept compiled functions at read-time so that we don't have to
- build them using function calls. */
- Lisp_Object tmp;
- tmp = read_vector (readcharfun);
- return Fmake_byte_code (XVECTOR (tmp)->size,
- XVECTOR (tmp)->contents);
- }
- #ifdef USE_TEXT_PROPERTIES
- if (c == '(')
- {
- Lisp_Object tmp;
- struct gcpro gcpro1;
-
- /* Read the string itself. */
- tmp = read1 (readcharfun);
- if (XTYPE (tmp) != Lisp_String)
- Fsignal (Qinvalid_read_syntax, Fcons (make_string ("#", 1), Qnil));
- GCPRO1 (tmp);
- /* Read the intervals and their properties. */
- while (1)
- {
- Lisp_Object beg, end, plist;
-
- beg = read1 (readcharfun);
- if (XTYPE (beg) == Lisp_Internal)
- {
- if (XINT (beg) == ')')
- break;
- Fsignal (Qinvalid_read_syntax, Fcons (make_string ("invalid string property list", 28), Qnil));
- }
- end = read1 (readcharfun);
- if (XTYPE (end) == Lisp_Internal)
- Fsignal (Qinvalid_read_syntax,
- Fcons (make_string ("invalid string property list", 28), Qnil));
-
- plist = read1 (readcharfun);
- if (XTYPE (plist) == Lisp_Internal)
- Fsignal (Qinvalid_read_syntax,
- Fcons (make_string ("invalid string property list", 28), Qnil));
- Fset_text_properties (beg, end, plist, tmp);
- }
- UNGCPRO;
- return tmp;
- }
- #endif
- UNREAD (c);
- Fsignal (Qinvalid_read_syntax, Fcons (make_string ("#", 1), Qnil));
-
- case ';':
- while ((c = READCHAR) >= 0 && c != '\n');
- goto retry;
-
- case '\'':
- {
- return Fcons (Qquote, Fcons (read0 (readcharfun), Qnil));
- }
-
- case '?':
- {
- register Lisp_Object val;
-
- c = READCHAR;
- if (c < 0) return Fsignal (Qend_of_file, Qnil);
-
- if (c == '\\')
- XSET (val, Lisp_Int, read_escape (readcharfun));
- else
- XSET (val, Lisp_Int, c);
-
- return val;
- }
-
- case '\"':
- {
- register char *p = read_buffer;
- register char *end = read_buffer + read_buffer_size;
- register int c;
- int cancel = 0;
-
- while ((c = READCHAR) >= 0
- && c != '\"')
- {
- if (p == end)
- {
- char *new = (char *) xrealloc (read_buffer, read_buffer_size *= 2);
- p += new - read_buffer;
- read_buffer += new - read_buffer;
- end = read_buffer + read_buffer_size;
- }
- if (c == '\\')
- c = read_escape (readcharfun);
- /* c is -1 if \ newline has just been seen */
- if (c == -1)
- {
- if (p == read_buffer)
- cancel = 1;
- }
- else if (c & CHAR_META)
- /* Move the meta bit to the right place for a string. */
- *p++ = (c & ~CHAR_META) | 0x80;
- else
- *p++ = c;
- }
- if (c < 0) return Fsignal (Qend_of_file, Qnil);
-
- /* If purifying, and string starts with \ newline,
- return zero instead. This is for doc strings
- that we are really going to find in etc/DOC.nn.nn */
- if (!NILP (Vpurify_flag) && NILP (Vdoc_file_name) && cancel)
- return make_number (0);
-
- if (read_pure)
- return make_pure_string (read_buffer, p - read_buffer);
- else
- return make_string (read_buffer, p - read_buffer);
- }
-
- case '.':
- {
- #ifdef LISP_FLOAT_TYPE
- /* If a period is followed by a number, then we should read it
- as a floating point number. Otherwise, it denotes a dotted
- pair. */
- int next_char = READCHAR;
- UNREAD (next_char);
-
- if (! isdigit (next_char))
- #endif
- {
- register Lisp_Object val;
- XSET (val, Lisp_Internal, c);
- return val;
- }
-
- /* Otherwise, we fall through! Note that the atom-reading loop
- below will now loop at least once, assuring that we will not
- try to UNREAD two characters in a row. */
- }
- default:
- if (c <= 040) goto retry;
- {
- register char *p = read_buffer;
-
- {
- register char *end = read_buffer + read_buffer_size;
-
- while (c > 040 &&
- !(c == '\"' || c == '\'' || c == ';' || c == '?'
- || c == '(' || c == ')'
- #ifndef LISP_FLOAT_TYPE
- /* If we have floating-point support, then we need
- to allow <digits><dot><digits>. */
- || c =='.'
- #endif /* not LISP_FLOAT_TYPE */
- || c == '[' || c == ']' || c == '#'
- ))
- {
- if (p == end)
- {
- register char *new = (char *) xrealloc (read_buffer, read_buffer_size *= 2);
- p += new - read_buffer;
- read_buffer += new - read_buffer;
- end = read_buffer + read_buffer_size;
- }
- if (c == '\\')
- c = READCHAR;
- *p++ = c;
- c = READCHAR;
- }
-
- if (p == end)
- {
- char *new = (char *) xrealloc (read_buffer, read_buffer_size *= 2);
- p += new - read_buffer;
- read_buffer += new - read_buffer;
- /* end = read_buffer + read_buffer_size; */
- }
- *p = 0;
- if (c >= 0)
- UNREAD (c);
- }
-
- /* Is it an integer? */
- {
- register char *p1;
- register Lisp_Object val;
- p1 = read_buffer;
- if (*p1 == '+' || *p1 == '-') p1++;
- if (p1 != p)
- {
- while (p1 != p && (c = *p1) >= '0' && c <= '9') p1++;
- #ifdef LISP_FLOAT_TYPE
- /* Integers can have trailing decimal points. */
- if (p1 > read_buffer && p1 < p && *p1 == '.') p1++;
- #endif
- if (p1 == p)
- /* It is an integer. */
- {
- #ifdef LISP_FLOAT_TYPE
- if (p1[-1] == '.')
- p1[-1] = '\0';
- #endif
- XSET (val, Lisp_Int, atoi (read_buffer));
- return val;
- }
- }
- #ifdef LISP_FLOAT_TYPE
- if (isfloat_string (read_buffer))
- return make_float (atof (read_buffer));
- #endif
- }
-
- return intern (read_buffer);
- }
- }
- }
-
- #ifdef LISP_FLOAT_TYPE
-
- #define LEAD_INT 1
- #define DOT_CHAR 2
- #define TRAIL_INT 4
- #define E_CHAR 8
- #define EXP_INT 16
-
- int
- isfloat_string (cp)
- register char *cp;
- {
- register state;
-
- state = 0;
- if (*cp == '+' || *cp == '-')
- cp++;
-
- if (isdigit(*cp))
- {
- state |= LEAD_INT;
- while (isdigit (*cp))
- cp ++;
- }
- if (*cp == '.')
- {
- state |= DOT_CHAR;
- cp++;
- }
- if (isdigit(*cp))
- {
- state |= TRAIL_INT;
- while (isdigit (*cp))
- cp++;
- }
- if (*cp == 'e')
- {
- state |= E_CHAR;
- cp++;
- }
- if ((*cp == '+') || (*cp == '-'))
- cp++;
-
- if (isdigit (*cp))
- {
- state |= EXP_INT;
- while (isdigit (*cp))
- cp++;
- }
- return (*cp == 0
- && (state == (LEAD_INT|DOT_CHAR|TRAIL_INT)
- || state == (DOT_CHAR|TRAIL_INT)
- || state == (LEAD_INT|E_CHAR|EXP_INT)
- || state == (LEAD_INT|DOT_CHAR|TRAIL_INT|E_CHAR|EXP_INT)
- || state == (DOT_CHAR|TRAIL_INT|E_CHAR|EXP_INT)));
- }
- #endif /* LISP_FLOAT_TYPE */
-
- static Lisp_Object
- read_vector (readcharfun)
- Lisp_Object readcharfun;
- {
- register int i;
- register int size;
- register Lisp_Object *ptr;
- register Lisp_Object tem, vector;
- register struct Lisp_Cons *otem;
- Lisp_Object len;
-
- tem = read_list (1, readcharfun);
- len = Flength (tem);
- vector = (read_pure ? make_pure_vector (XINT (len)) : Fmake_vector (len, Qnil));
-
-
- size = XVECTOR (vector)->size;
- ptr = XVECTOR (vector)->contents;
- for (i = 0; i < size; i++)
- {
- ptr[i] = read_pure ? Fpurecopy (Fcar (tem)) : Fcar (tem);
- otem = XCONS (tem);
- tem = Fcdr (tem);
- free_cons (otem);
- }
- return vector;
- }
-
- /* flag = 1 means check for ] to terminate rather than ) and .
- flag = -1 means check for starting with defun
- and make structure pure. */
-
- static Lisp_Object
- read_list (flag, readcharfun)
- int flag;
- register Lisp_Object readcharfun;
- {
- /* -1 means check next element for defun,
- 0 means don't check,
- 1 means already checked and found defun. */
- int defunflag = flag < 0 ? -1 : 0;
- Lisp_Object val, tail;
- register Lisp_Object elt, tem;
- struct gcpro gcpro1, gcpro2;
-
- val = Qnil;
- tail = Qnil;
-
- while (1)
- {
- GCPRO2 (val, tail);
- elt = read1 (readcharfun);
- UNGCPRO;
- if (XTYPE (elt) == Lisp_Internal)
- {
- if (flag > 0)
- {
- if (XINT (elt) == ']')
- return val;
- return Fsignal (Qinvalid_read_syntax, Fcons (make_string (") or . in a vector", 18), Qnil));
- }
- if (XINT (elt) == ')')
- return val;
- if (XINT (elt) == '.')
- {
- GCPRO2 (val, tail);
- if (!NILP (tail))
- XCONS (tail)->cdr = read0 (readcharfun);
- else
- val = read0 (readcharfun);
- elt = read1 (readcharfun);
- UNGCPRO;
- if (XTYPE (elt) == Lisp_Internal && XINT (elt) == ')')
- return val;
- return Fsignal (Qinvalid_read_syntax, Fcons (make_string (". in wrong context", 18), Qnil));
- }
- return Fsignal (Qinvalid_read_syntax, Fcons (make_string ("] in a list", 11), Qnil));
- }
- tem = (read_pure && flag <= 0
- ? pure_cons (elt, Qnil)
- : Fcons (elt, Qnil));
- if (!NILP (tail))
- XCONS (tail)->cdr = tem;
- else
- val = tem;
- tail = tem;
- if (defunflag < 0)
- defunflag = EQ (elt, Qdefun);
- else if (defunflag > 0)
- read_pure = 1;
- }
- }
-
- Lisp_Object Vobarray;
- Lisp_Object initial_obarray;
-
- Lisp_Object
- check_obarray (obarray)
- Lisp_Object obarray;
- {
- while (XTYPE (obarray) != Lisp_Vector || XVECTOR (obarray)->size == 0)
- {
- /* If Vobarray is now invalid, force it to be valid. */
- if (EQ (Vobarray, obarray)) Vobarray = initial_obarray;
-
- obarray = wrong_type_argument (Qvectorp, obarray);
- }
- return obarray;
- }
-
- static int hash_string ();
- Lisp_Object oblookup ();
-
- Lisp_Object
- intern (str)
- char *str;
- {
- Lisp_Object tem;
- int len = strlen (str);
- Lisp_Object obarray = Vobarray;
-
- if (XTYPE (obarray) != Lisp_Vector || XVECTOR (obarray)->size == 0)
- obarray = check_obarray (obarray);
- tem = oblookup (obarray, str, len);
- if (XTYPE (tem) == Lisp_Symbol)
- return tem;
- return Fintern ((!NILP (Vpurify_flag)
- ? make_pure_string (str, len)
- : make_string (str, len)),
- obarray);
- }
-
- DEFUN ("intern", Fintern, Sintern, 1, 2, 0,
- "Return the canonical symbol whose name is STRING.\n\
- If there is none, one is created by this function and returned.\n\
- A second optional argument specifies the obarray to use;\n\
- it defaults to the value of `obarray'.")
- (str, obarray)
- Lisp_Object str, obarray;
- {
- register Lisp_Object tem, sym, *ptr;
-
- if (NILP (obarray)) obarray = Vobarray;
- obarray = check_obarray (obarray);
-
- CHECK_STRING (str, 0);
-
- tem = oblookup (obarray, XSTRING (str)->data, XSTRING (str)->size);
- if (XTYPE (tem) != Lisp_Int)
- return tem;
-
- if (!NILP (Vpurify_flag))
- str = Fpurecopy (str);
- sym = Fmake_symbol (str);
-
- ptr = &XVECTOR (obarray)->contents[XINT (tem)];
- if (XTYPE (*ptr) == Lisp_Symbol)
- XSYMBOL (sym)->next = XSYMBOL (*ptr);
- else
- XSYMBOL (sym)->next = 0;
- *ptr = sym;
- return sym;
- }
-
- DEFUN ("intern-soft", Fintern_soft, Sintern_soft, 1, 2, 0,
- "Return the canonical symbol whose name is STRING, or nil if none exists.\n\
- A second optional argument specifies the obarray to use;\n\
- it defaults to the value of `obarray'.")
- (str, obarray)
- Lisp_Object str, obarray;
- {
- register Lisp_Object tem;
-
- if (NILP (obarray)) obarray = Vobarray;
- obarray = check_obarray (obarray);
-
- CHECK_STRING (str, 0);
-
- tem = oblookup (obarray, XSTRING (str)->data, XSTRING (str)->size);
- if (XTYPE (tem) != Lisp_Int)
- return tem;
- return Qnil;
- }
-
- Lisp_Object
- oblookup (obarray, ptr, size)
- Lisp_Object obarray;
- register char *ptr;
- register int size;
- {
- int hash, obsize;
- register Lisp_Object tail;
- Lisp_Object bucket, tem;
-
- if (XTYPE (obarray) != Lisp_Vector ||
- (obsize = XVECTOR (obarray)->size) == 0)
- {
- obarray = check_obarray (obarray);
- obsize = XVECTOR (obarray)->size;
- }
- /* Combining next two lines breaks VMS C 2.3. */
- hash = hash_string (ptr, size);
- hash %= obsize;
- bucket = XVECTOR (obarray)->contents[hash];
- if (XFASTINT (bucket) == 0)
- ;
- else if (XTYPE (bucket) != Lisp_Symbol)
- error ("Bad data in guts of obarray"); /* Like CADR error message */
- else for (tail = bucket; ; XSET (tail, Lisp_Symbol, XSYMBOL (tail)->next))
- {
- if (XSYMBOL (tail)->name->size == size &&
- !bcmp (XSYMBOL (tail)->name->data, ptr, size))
- return tail;
- else if (XSYMBOL (tail)->next == 0)
- break;
- }
- XSET (tem, Lisp_Int, hash);
- return tem;
- }
-
- static int
- hash_string (ptr, len)
- unsigned char *ptr;
- int len;
- {
- register unsigned char *p = ptr;
- register unsigned char *end = p + len;
- register unsigned char c;
- register int hash = 0;
-
- while (p != end)
- {
- c = *p++;
- if (c >= 0140) c -= 40;
- hash = ((hash<<3) + (hash>>28) + c);
- }
- return hash & 07777777777;
- }
-
- void
- map_obarray (obarray, fn, arg)
- Lisp_Object obarray;
- int (*fn) ();
- Lisp_Object arg;
- {
- register int i;
- register Lisp_Object tail;
- CHECK_VECTOR (obarray, 1);
- for (i = XVECTOR (obarray)->size - 1; i >= 0; i--)
- {
- tail = XVECTOR (obarray)->contents[i];
- if (XFASTINT (tail) != 0)
- while (1)
- {
- (*fn) (tail, arg);
- if (XSYMBOL (tail)->next == 0)
- break;
- XSET (tail, Lisp_Symbol, XSYMBOL (tail)->next);
- }
- }
- }
-
- mapatoms_1 (sym, function)
- Lisp_Object sym, function;
- {
- call1 (function, sym);
- }
-
- DEFUN ("mapatoms", Fmapatoms, Smapatoms, 1, 2, 0,
- "Call FUNCTION on every symbol in OBARRAY.\n\
- OBARRAY defaults to the value of `obarray'.")
- (function, obarray)
- Lisp_Object function, obarray;
- {
- Lisp_Object tem;
-
- if (NILP (obarray)) obarray = Vobarray;
- obarray = check_obarray (obarray);
-
- map_obarray (obarray, mapatoms_1, function);
- return Qnil;
- }
-
- #define OBARRAY_SIZE 509
-
- void
- init_obarray ()
- {
- Lisp_Object oblength;
- int hash;
- Lisp_Object *tem;
-
- XFASTINT (oblength) = OBARRAY_SIZE;
-
- Qnil = Fmake_symbol (make_pure_string ("nil", 3));
- Vobarray = Fmake_vector (oblength, make_number (0));
- initial_obarray = Vobarray;
- staticpro (&initial_obarray);
- /* Intern nil in the obarray */
- /* These locals are to kludge around a pyramid compiler bug. */
- hash = hash_string ("nil", 3);
- /* Separate statement here to avoid VAXC bug. */
- hash %= OBARRAY_SIZE;
- tem = &XVECTOR (Vobarray)->contents[hash];
- *tem = Qnil;
-
- Qunbound = Fmake_symbol (make_pure_string ("unbound", 7));
- XSYMBOL (Qnil)->function = Qunbound;
- XSYMBOL (Qunbound)->value = Qunbound;
- XSYMBOL (Qunbound)->function = Qunbound;
-
- Qt = intern ("t");
- XSYMBOL (Qnil)->value = Qnil;
- XSYMBOL (Qnil)->plist = Qnil;
- XSYMBOL (Qt)->value = Qt;
-
- /* Qt is correct even if CANNOT_DUMP. loadup.el will set to nil at end. */
- Vpurify_flag = Qt;
-
- Qvariable_documentation = intern ("variable-documentation");
-
- read_buffer_size = 100;
- read_buffer = (char *) malloc (read_buffer_size);
- }
-
- void
- defsubr (sname)
- struct Lisp_Subr *sname;
- {
- Lisp_Object sym;
- sym = intern (sname->symbol_name);
- XSET (XSYMBOL (sym)->function, Lisp_Subr, sname);
- }
-
- #ifdef NOTDEF /* use fset in subr.el now */
- void
- defalias (sname, string)
- struct Lisp_Subr *sname;
- char *string;
- {
- Lisp_Object sym;
- sym = intern (string);
- XSET (XSYMBOL (sym)->function, Lisp_Subr, sname);
- }
- #endif /* NOTDEF */
-
- /* New replacement for DefIntVar; it ignores the doc string argument
- on the assumption that make-docfile will handle that. */
- /* Define an "integer variable"; a symbol whose value is forwarded
- to a C variable of type int. Sample call: */
- /* DEFVARINT ("indent-tabs-mode", &indent_tabs_mode, "Documentation"); */
-
- void
- defvar_int (namestring, address, doc)
- char *namestring;
- int *address;
- char *doc;
- {
- Lisp_Object sym;
- sym = intern (namestring);
- XSET (XSYMBOL (sym)->value, Lisp_Intfwd, address);
- }
-
- /* Similar but define a variable whose value is T if address contains 1,
- NIL if address contains 0 */
-
- void
- defvar_bool (namestring, address, doc)
- char *namestring;
- int *address;
- char *doc;
- {
- Lisp_Object sym;
- sym = intern (namestring);
- XSET (XSYMBOL (sym)->value, Lisp_Boolfwd, address);
- }
-
- /* Similar but define a variable whose value is the Lisp Object stored at address. */
-
- void
- defvar_lisp (namestring, address, doc)
- char *namestring;
- Lisp_Object *address;
- char *doc;
- {
- Lisp_Object sym;
- sym = intern (namestring);
- XSET (XSYMBOL (sym)->value, Lisp_Objfwd, address);
- staticpro (address);
- }
-
- /* Similar but don't request gc-marking of the C variable.
- Used when that variable will be gc-marked for some other reason,
- since marking the same slot twice can cause trouble with strings. */
-
- void
- defvar_lisp_nopro (namestring, address, doc)
- char *namestring;
- Lisp_Object *address;
- char *doc;
- {
- Lisp_Object sym;
- sym = intern (namestring);
- XSET (XSYMBOL (sym)->value, Lisp_Objfwd, address);
- }
-
- #ifndef standalone
-
- /* Similar but define a variable whose value is the Lisp Object stored in
- the current buffer. address is the address of the slot in the buffer that is current now. */
-
- void
- defvar_per_buffer (namestring, address, type, doc)
- char *namestring;
- Lisp_Object *address;
- Lisp_Object type;
- char *doc;
- {
- Lisp_Object sym;
- int offset;
- extern struct buffer buffer_local_symbols;
-
- sym = intern (namestring);
- offset = (char *)address - (char *)current_buffer;
-
- XSET (XSYMBOL (sym)->value, Lisp_Buffer_Objfwd,
- (Lisp_Object *) offset);
- *(Lisp_Object *)(offset + (char *)&buffer_local_symbols) = sym;
- *(Lisp_Object *)(offset + (char *)&buffer_local_types) = type;
- if (*(int *)(offset + (char *)&buffer_local_flags) == 0)
- /* Did a DEFVAR_PER_BUFFER without initializing the corresponding
- slot of buffer_local_flags */
- abort ();
- }
-
- #endif /* standalone */
-
- init_lread ()
- {
- char *normal;
-
- /* Compute the default load-path. */
- #ifdef CANNOT_DUMP
- normal = PATH_LOADSEARCH;
- Vload_path = decode_env_path (0, normal);
- #else
- if (NILP (Vpurify_flag))
- normal = PATH_LOADSEARCH;
- else
- normal = PATH_DUMPLOADSEARCH;
-
- /* In a dumped Emacs, we normally have to reset the value of
- Vload_path from PATH_LOADSEARCH, since the value that was dumped
- uses ../lisp, instead of the path of the installed elisp
- libraries. However, if it appears that Vload_path was changed
- from the default before dumping, don't override that value. */
- if (initialized)
- {
- Lisp_Object dump_path;
-
- dump_path = decode_env_path (0, PATH_DUMPLOADSEARCH);
- if (! NILP (Fequal (dump_path, Vload_path)))
- Vload_path = decode_env_path (0, normal);
- }
- else
- Vload_path = decode_env_path (0, normal);
- #endif
-
- /* Warn if dirs in the *standard* path don't exist. */
- {
- Lisp_Object path_tail;
-
- for (path_tail = Vload_path;
- !NILP (path_tail);
- path_tail = XCONS (path_tail)->cdr)
- {
- Lisp_Object dirfile;
- dirfile = Fcar (path_tail);
- if (XTYPE (dirfile) == Lisp_String)
- {
- dirfile = Fdirectory_file_name (dirfile);
- if (access (XSTRING (dirfile)->data, 0) < 0)
- printf ("Warning: lisp library (%s) does not exist.\n",
- XSTRING (Fcar (path_tail))->data);
- }
- }
- }
-
- /* If the EMACSLOADPATH environment variable is set, use its value.
- This doesn't apply if we're dumping. */
- if (NILP (Vpurify_flag)
- && egetenv ("EMACSLOADPATH"))
- Vload_path = decode_env_path ("EMACSLOADPATH", normal);
-
- Vvalues = Qnil;
-
- load_in_progress = 0;
- }
-
- void
- syms_of_lread ()
- {
- defsubr (&Sread);
- defsubr (&Sread_from_string);
- defsubr (&Sintern);
- defsubr (&Sintern_soft);
- defsubr (&Sload);
- defsubr (&Seval_buffer);
- defsubr (&Seval_region);
- defsubr (&Sread_char);
- defsubr (&Sread_char_exclusive);
- defsubr (&Sread_event);
- defsubr (&Sget_file_char);
- defsubr (&Smapatoms);
-
- DEFVAR_LISP ("obarray", &Vobarray,
- "Symbol table for use by `intern' and `read'.\n\
- It is a vector whose length ought to be prime for best results.\n\
- The vector's contents don't make sense if examined from Lisp programs;\n\
- to find all the symbols in an obarray, use `mapatoms'.");
-
- DEFVAR_LISP ("values", &Vvalues,
- "List of values of all expressions which were read, evaluated and printed.\n\
- Order is reverse chronological.");
-
- DEFVAR_LISP ("standard-input", &Vstandard_input,
- "Stream for read to get input from.\n\
- See documentation of `read' for possible values.");
- Vstandard_input = Qt;
-
- DEFVAR_LISP ("load-path", &Vload_path,
- "*List of directories to search for files to load.\n\
- Each element is a string (directory name) or nil (try default directory).\n\
- Initialized based on EMACSLOADPATH environment variable, if any,\n\
- otherwise to default specified by file `paths.h' when Emacs was built.");
-
- DEFVAR_BOOL ("load-in-progress", &load_in_progress,
- "Non-nil iff inside of `load'.");
-
- DEFVAR_LISP ("after-load-alist", &Vafter_load_alist,
- "An alist of expressions to be evalled when particular files are loaded.\n\
- Each element looks like (FILENAME FORMS...).\n\
- When `load' is run and the file-name argument is FILENAME,\n\
- the FORMS in the corresponding element are executed at the end of loading.\n\n\
- FILENAME must match exactly! Normally FILENAME is the name of a library,\n\
- with no directory specified, since that is how `load' is normally called.\n\
- An error in FORMS does not undo the load,\n\
- but does prevent execution of the rest of the FORMS.");
- Vafter_load_alist = Qnil;
-
- DEFVAR_LISP ("load-history", &Vload_history,
- "Alist mapping source file names to symbols and features.\n\
- Each alist element is a list that starts with a file name,\n\
- except for one element (optional) that starts with nil and describes\n\
- definitions evaluated from buffers not visiting files.\n\
- The remaining elements of each list are symbols defined as functions\n\
- or variables, and cons cells `(provide . FEATURE)' and `(require . FEATURE)'.");
- Vload_history = Qnil;
-
- DEFVAR_LISP ("current-load-list", &Vcurrent_load_list,
- "Used for internal purposes by `load'.");
- Vcurrent_load_list = Qnil;
-
- Qcurrent_load_list = intern ("current-load-list");
- staticpro (&Qcurrent_load_list);
-
- Qstandard_input = intern ("standard-input");
- staticpro (&Qstandard_input);
-
- Qread_char = intern ("read-char");
- staticpro (&Qread_char);
-
- Qget_file_char = intern ("get-file-char");
- staticpro (&Qget_file_char);
-
- Qascii_character = intern ("ascii-character");
- staticpro (&Qascii_character);
-
- Qload = intern ("load");
- staticpro (&Qload);
- }
-