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lread.c
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1993-11-22
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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>
#ifdef WINDOWSNT
#include <fcntl.h>
#else
#include <sys/file.h>
#endif /* !WINDOWSNT */
#include <ctype.h>
#include "config.h"
#include "lisp.h"
#ifndef standalone
#include "buffer.h"
#include "paths.h"
#include "commands.h"
#include "keyboard.h"
#include "frame.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 */
#ifdef STDC_HEADERS
#include <string.h>
#include <io.h>
#endif
#include "lread_p.h"
#include "intervals_p.h"
#include "xdisp_p.h"
#include "alloca_p.h"
static int readchar _P_((Lisp_Object readcharfun));
static void unreadchar _P_((Lisp_Object readcharfun, int c));
static Lisp_Object load_unwind _P_((Lisp_Object stream));
static int complete_filename_p _P_((Lisp_Object pathname));
static void build_load_history _P_((FILE *stream, Lisp_Object source));
static void readevalloop _P_((Lisp_Object readcharfun, FILE *stream,
Lisp_Object sourcename,
Lisp_Object (*evalfun)(Lisp_Object val),
int printflag));
static Lisp_Object read0 _P_((Lisp_Object readcharfun));
static int read_escape _P_((Lisp_Object readcharfun));
static Lisp_Object read1 _P_((register Lisp_Object readcharfun));
static Lisp_Object read_vector _P_((Lisp_Object readcharfun));
static Lisp_Object read_list _P_((int flag,
register Lisp_Object readcharfun));
static int hash_string _P_((unsigned char *ptr, int len));
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));
}
/* get a character from the tty */
/* 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;
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;
}
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';
}
#ifdef WINDOWSNT
/*
* We need binary mode here otherwise the CRT will filter Ctrl-Zs as
* EOFs, confusing the heck out of emacs. (voelker)
*/
stream = _fdopen (fd, "rb");
#else
stream = fdopen (fd, "r");
#endif /* !WINDOWSNT */
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 (
#ifdef WINDOWSNT
*s == '\\' || (s[1] == ':' && s[2] == '\\')
#else /* !WINDOWSNT */
*s == '/'
#endif /* !WINDOWSNT */
#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 {
#ifdef WINDOWSNT
/*
* Ok, time to get hackish. NT's CRT will automatically
* convert Ctrl-Zs to EOFs, horribly confusing emacs,
* unless the file is opened in binary mode. However,
* if we open the file in binary, then we also lose the
* CRT CR-LF -> CR filtering. Compromise -- if the
* suffix is ".elc", then use binary mode; otherwise,
* open it with filtering. (voelker)
*/
if (lsuffix == 3 && !strncmp(".el", nsuffix, 3)) {
fd = open (fn, 0, 0);
} else {
// Be conservative towards opening using binary flag.
fd = open (fn, _O_BINARY, 0);
}
#else
fd = open (fn, 0, 0);
#endif /* !WINDOWSNT */
}
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 (dummy) /* Used as unwind-protect function in readevalloop */
Lisp_Object dummy;
{
read_pure = 0;
return Qnil;
}
static void
readevalloop (readcharfun, stream, sourcename, evalfun, printflag)
Lisp_Object readcharfun;
FILE *stream;
Lisp_Object sourcename;
Lisp_Object (*evalfun) _P_((Lisp_Object val));
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'
#ifdef WINDOWSNT
|| c == '\r'
#endif
|| 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;
}
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;
_VOID_ (*fn) _P_((Lisp_Object tail, Lisp_Object arg));
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);
}
}
}
_VOID_
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;
{
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 */
_VOID_
init_lread ()
{
char *normal;
/* Compute the default load-path. */
#ifdef CANNOT_DUMP
normal = PATH_LOADSEARCH;
#ifdef WINDOWSNT
Vload_path = decode_env_path ("PATH", normal);
#else /* !WINDOWSNT */
Vload_path = decode_env_path (0, normal);
#endif /* !WINDOWSNT */
#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. */
#ifdef WINDOWSNT
// How can this not be this?
if (!NILP (Vpurify_flag)
&& egetenv ("EMACSLOADPATH"))
Vload_path = decode_env_path ("EMACSLOADPATH", normal);
#else
if (NILP (Vpurify_flag)
&& egetenv ("EMACSLOADPATH"))
Vload_path = decode_env_path ("EMACSLOADPATH", normal);
#endif
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);
}