/* Lisp parsing and input streams. Copyright (C) 1985 Richard M. Stallman. This file is part of GNU Emacs. GNU Emacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY. No author or distributor accepts responsibility to anyone for the consequences of using it or for whether it serves any particular purpose or works at all, unless he says so in writing. Refer to the GNU Emacs General Public License for full details. Everyone is granted permission to copy, modify and redistribute GNU Emacs, but only under the conditions described in the GNU Emacs General Public License. A copy of this license is supposed to have been given to you along with GNU Emacs so you can know your rights and responsibilities. It should be in a file named COPYING. Among other things, the copyright notice and this notice must be preserved on all copies. */ #include #include #include #include #undef NULL #include "config.h" #include "lisp.h" #ifndef standalone #include "buffer.h" #include "paths.h" #endif #ifdef lint #include #endif /* lint */ #ifndef X_OK #define X_OK 01 #endif Lisp_Object Qread_char, Qget_file_char, Qstandard_input; Lisp_Object Qvariable_documentation, Vvalues, Vstandard_input; /* 1 iff inside of load */ int load_in_progress; /* Search path for files to be loaded. */ Lisp_Object Vload_path; /* 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. */ static int unrch; static int readchar (readcharfun) Lisp_Object readcharfun; { Lisp_Object tem; register struct buffer_text *inbuffer; register int c, mpos; if (unrch >= 0) { c = unrch; unrch = -1; return c; } if (XTYPE (readcharfun) == Lisp_Buffer) { if (XBUFFER (readcharfun) == bf_cur) inbuffer = &bf_text; else inbuffer = &XBUFFER (readcharfun)->text; if (inbuffer->pointloc > inbuffer->size1 + inbuffer->size2 - inbuffer->tail_clip) return -1; c = *(unsigned char *) &(inbuffer->pointloc > inbuffer->size1 ? inbuffer->p2 : inbuffer->p1)[inbuffer->pointloc]; inbuffer->pointloc++; return c; } if (XTYPE (readcharfun) == Lisp_Marker) { if (XMARKER (readcharfun)->buffer == bf_cur) inbuffer = &bf_text; else inbuffer = &XMARKER (readcharfun)->buffer->text; mpos = marker_position (readcharfun); if (mpos > inbuffer->size1 + inbuffer->size2 - inbuffer->tail_clip) return -1; c = *(unsigned char *) &(mpos > inbuffer->size1 ? inbuffer->p2 : inbuffer->p1)[mpos]; if (mpos != inbuffer->size1 + 1) 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) return (read_from_string_index < read_from_string_limit) ? XSTRING (readcharfun)->data[read_from_string_index++] : -1; tem = Fapply (readcharfun, Qnil); if (NULL (tem)) return -1; return XINT (tem); } #define READCHAR readchar(readcharfun) #define UNREAD(c) (unrch = c) static Lisp_Object read0 (), read1 (), read_list (), read_vector (); /* get a character from the tty */ 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.") () { register Lisp_Object val; #ifndef standalone XSET (val, Lisp_Int, get_char (0)); #else XSET (val, Lisp_Int, getchar ()); #endif return val; } 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; } void readevalloop (); Lisp_Object load_unwind (); DEFUN ("load", Fload, Sload, 1, 3, "sLoad file: ", "Execute a file of Lisp code named FILE.\n\ First tries FILE with .elc appended, then tries with .el,\n\ then tries FILE unmodified. Searches directories in load-path.\n\ If optional second arg MISSING-OK 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\ Return t if file exists.") (str, missing_ok, nomessage) Lisp_Object str, missing_ok, nomessage; { register FILE *stream; register int fd = -1; register Lisp_Object lispstream; int count = specpdl_ptr - specpdl; struct gcpro gcpro1; CHECK_STRING (str, 0); str = Fsubstitute_in_file_name (str); /* 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, ".elc", 0, 0); if (fd < 0) fd = openp (Vload_path, str, ".el", 0, 0); if (fd < 0) fd = openp (Vload_path, str, "", 0, 0); } if (fd < 0) if (NULL (missing_ok)) while (1) Fsignal (Qfile_error, Fcons (build_string ("Cannot open load file"), Fcons (str, Qnil))); else return Qnil; stream = fdopen (fd, "r"); if (stream == 0) { close (fd); error ("Failure to create stdio stream for %s", XSTRING (str)->data); } XSET (lispstream, Lisp_Internal_Stream, (int) stream); if (NULL (nomessage)) message ("Loading %s...", XSTRING (str)->data); GCPRO1 (str); record_unwind_protect (load_unwind, lispstream); load_in_progress = 1; readevalloop (Qget_file_char, stream, Feval, 0); unbind_to (count); UNGCPRO; if (!noninteractive && NULL (nomessage)) message ("Loading %s...done", XSTRING (str)->data); return Qt; } /* exec_only nonzero means don't open the files, just look for one that is executable; returns 1 on success, having stored a string into *storeptr */ 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 (*XSTRING (str)->data == '~' || *XSTRING (str)->data == '/') absolute = 1; for (; !NULL (path); path = Fcdr (path)) { filename = Fexpand_file_name (str, Fcar (path)); want_size = strlen (suffix) + XSTRING (filename)->size + 1; if (fn_size < want_size) fn = (char *) alloca (fn_size = 100 + want_size); strncpy (fn, XSTRING (filename)->data, XSTRING (filename)->size); fn[XSTRING (filename)->size] = 0; strcat (fn, suffix); if (exec_only) { if (!access (fn, X_OK) && stat (fn, &st) >= 0 && (st.st_mode & S_IFMT) != S_IFDIR) { if (storeptr) *storeptr = build_string (fn); return 1; } } else { fd = open (fn, 0, 0); if (fd >= 0) { if (storeptr) *storeptr = build_string (fn); return fd; } } if (absolute) return -1; } return -1; } Lisp_Object load_unwind (stream) /* used as unwind-protect function in load */ Lisp_Object stream; { fclose ((FILE *) XSTRING (stream)); load_in_progress = 0; return Qnil; } Lisp_Object unreadpure () /* Used as unwind-protect function in readevalloop */ { read_pure = 0; return Qnil; } void readevalloop (readcharfun, stream, evalfun, printflag) Lisp_Object readcharfun; FILE *stream; Lisp_Object (*evalfun) (); int printflag; { register int c; register Lisp_Object val; register int xunrch; int count = specpdl_ptr - specpdl; specbind (Qstandard_input, readcharfun); unrch = -1; 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 (!NULL (Vpurify_flag) && c == '(') { record_unwind_protect (unreadpure, Qnil); val = read_list (-1, readcharfun); unbind_to (count + 1); } else { UNREAD (c); val = read0 (readcharfun); } xunrch = unrch; unrch = -1; val = (*evalfun) (val); if (printflag) { Vvalues = Fcons (val, Vvalues); if (EQ (Vstandard_output, Qt)) Fprin1 (val, Qnil); else Fprint (val, Qnil); } unrch = xunrch; } unbind_to (count); } #ifndef standalone 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.") (printflag) Lisp_Object printflag; { int count = specpdl_ptr - specpdl; Lisp_Object tem; if (NULL (printflag)) tem = Qsymbolp; else tem = printflag; specbind (Qstandard_output, tem); record_unwind_protect (save_excursion_restore, save_excursion_save ()); SetPoint (FirstCharacter); readevalloop (Fcurrent_buffer (), 0, Feval, !NULL (printflag)); unbind_to (count); return Qnil; } 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 printing of output:\n\ nil means discard it; anything else is stream for print.") (b, e, printflag) Lisp_Object b, e, printflag; { int count = specpdl_ptr - specpdl; Lisp_Object tem; if (NULL (printflag)) tem = Qsymbolp; else tem = printflag; specbind (Qstandard_output, tem); if (NULL (printflag)) record_unwind_protect (save_excursion_restore, save_excursion_save ()); record_unwind_protect (save_restriction_restore, save_restriction_save ()); SetPoint (XINT (b)); Fnarrow_to_region (make_number (FirstCharacter), e); readevalloop (Fcurrent_buffer (), 0, Feval, !NULL (printflag)); unbind_to (count); return 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 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\ 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 (); unrch = -1; /* Allow buffering-back only within a read. */ if (NULL (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 (NULL (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 (NULL (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; unrch = -1; /* Allow buffering-back only within a read. */ 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 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 ']': case '.': { register Lisp_Object val; XSET (val, Lisp_Internal, c); return val; } case '#': return 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; XSET (val, Lisp_Int, READCHAR); if (XFASTINT (val) == '\\') XSETINT (val, read_escape (readcharfun)); 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 != '\"' || (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; } if (c == '\\') c = read_escape (readcharfun); /* c is -1 if \ newline has just been seen */ if (c < 0) { if (p == read_buffer) cancel = 1; } else *p++ = c; } UNREAD (c); /* 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 (!NULL (Vpurify_flag) && NULL (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); } 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 == ')' || c =='.' || 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; 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++; if (p1 == p) /* It is. */ { XSET (val, Lisp_Int, atoi (read_buffer)); return val; } } } return intern (read_buffer); } } } 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; register Lisp_Object elt, val, tail, tem; val = Qnil; tail = Qnil; while (1) { elt = read1 (readcharfun); 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) == '.') { if (!NULL (tail)) tail = XCONS (tail)->cdr = read0 (readcharfun); else val = read0 (readcharfun); elt = read1 (readcharfun); 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 vector", 13), Qnil)); } tem = (read_pure && flag <= 0 ? pure_cons (elt, Qnil) : Fcons (elt, Qnil)); if (!NULL (tail)) XCONS (tail)->cdr = tem; else val = tem; tail = tem; if (defunflag < 0) defunflag = EQ (elt, Qdefun); else if (defunflag > 0) read_pure = 1; } } static int read_escape (readcharfun) Lisp_Object readcharfun; { register int c = READCHAR; switch (c) { case 'a': return '\a'; case 'b': return '\b'; 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 | 0200; case 'C': c = READCHAR; if (c != '-') error ("Invalid escape character syntax"); case '^': c = READCHAR; if (c == '\\') c = read_escape (readcharfun); if (c == '?') return 0177; return (c & 0200) | (c & 037); case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': { 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; } default: return c; } } Lisp_Object Vobarray; Lisp_Object initial_obarray; /* CHECK_OBARRAY assumes the variable `tem' is available */ #define CHECK_OBARRAY(obarray) \ if (XTYPE (obarray) != Lisp_Vector) \ { tem = obarray; obarray = initial_obarray; \ wrong_type_argument (Qvectorp, tem); } static int hash_string (); Lisp_Object oblookup (); Lisp_Object intern (str) char *str; { Lisp_Object tem; int len = strlen (str); CHECK_OBARRAY (Vobarray); tem = oblookup (Vobarray, str, len); if (XTYPE (tem) == Lisp_Symbol) return tem; return Fintern ((!NULL (Vpurify_flag) ? make_pure_string (str, len) : make_string (str, len)), Vobarray); } DEFUN ("intern", Fintern, Sintern, 1, 2, 0, "Return the symbol whose name is STRING.\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 (NULL (obarray)) { CHECK_OBARRAY (Vobarray); obarray = Vobarray; } else CHECK_VECTOR (obarray, 1); CHECK_STRING (str, 0); tem = oblookup (obarray, XSTRING (str)->data, XSTRING (str)->size); if (XTYPE (tem) != Lisp_Int) return tem; if (!NULL (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 symbol whose name is STRING, or nil if none exists yet.\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 (NULL (obarray)) { CHECK_OBARRAY (Vobarray); obarray = Vobarray; } else CHECK_VECTOR (obarray, 1); 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)) error ("Invalid obarray"); hash = hash_string (ptr, size) % obsize; bucket = XVECTOR (obarray)->contents[hash]; for (tail = bucket; XSYMBOL (tail); XSETSYMBOL (tail, XSYMBOL (tail)->next)) { if (XSYMBOL (tail)->name->size != size) continue; if (bcmp (XSYMBOL (tail)->name->data, ptr, size)) continue; return tail; } 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--) for (tail = XVECTOR (obarray)->contents[i]; XTYPE (tail) == Lisp_Symbol && XSYMBOL (tail); XSETSYMBOL (tail, XSYMBOL (tail)->next)) (*fn) (tail, arg); } 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 (NULL (obarray)) { CHECK_OBARRAY (Vobarray); obarray = Vobarray; } else CHECK_VECTOR (obarray, 1); map_obarray (obarray, mapatoms_1, function); return Qnil; } #define OBARRAY_SIZE 511 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 (&Vobarray); staticpro (&initial_obarray); /* Intern nil in the obarray */ /* These locals are to kludge around a pyramid compiler bug. */ hash = hash_string ("nil", 3) % 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; 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); } void defalias (sname, string) struct Lisp_Subr *sname; char *string; { Lisp_Object sym; sym = intern (string); XSET (XSYMBOL (sym)->function, Lisp_Subr, sname); } /* Define an "integer variable"; a symbol whose value is forwarded to a C variable of type int. Sample call is DefIntVar ("indent-tabs-mode", &indent_tabs_mode, "Documentation"); */ void DefIntVar (namestring, address, doc) char *namestring; int *address; char *doc; { Lisp_Object sym; sym = intern (namestring); XSET (XSYMBOL (sym)->value, Lisp_Intfwd, address); Fput (sym, Qvariable_documentation, make_pure_string (doc, strlen (doc))); } /* Similar but define a variable whose value is T if address contains 1, NIL if address contains 0 */ void DefBoolVar (namestring, address, doc) char *namestring; int *address; char *doc; { Lisp_Object sym; sym = intern (namestring); XSET (XSYMBOL (sym)->value, Lisp_Boolfwd, address); Fput (sym, Qvariable_documentation, make_pure_string (doc, strlen (doc))); } /* Similar but define a variable whose value is the Lisp Object stored at address. */ void DefLispVar (namestring, address, doc) char *namestring; Lisp_Object *address; char *doc; { Lisp_Object sym; sym = intern (namestring); XSET (XSYMBOL (sym)->value, Lisp_Objfwd, address); Fput (sym, Qvariable_documentation, make_pure_string (doc, strlen (doc))); } #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 DefBufferLispVar (namestring, address, doc) char *namestring; Lisp_Object *address; char *doc; { Lisp_Object sym; sym = intern (namestring); XSET (XSYMBOL (sym)->value, Lisp_Buffer_Objfwd, (Lisp_Object *)((char *)address - (char *)bf_cur)); Fput (sym, Qvariable_documentation, make_pure_string (doc, strlen (doc))); } #endif standalone init_read () { Vvalues = Qnil; Vload_path = decode_env_path ("EMACSLOADPATH", PATH_LOADSEARCH); #ifndef CANNOT_DUMP if (!NULL (Vpurify_flag)) Vload_path = Fcons (build_string ("../lisp"), Vload_path); #endif /* not CANNOT_DUMP */ } void syms_of_read () { defsubr (&Sread); defsubr (&Sread_from_string); defsubr (&Sintern); defsubr (&Sintern_soft); defsubr (&Sload); defsubr (&Seval_current_buffer); defsubr (&Seval_region); defsubr (&Sread_char); defsubr (&Sget_file_char); defsubr (&Smapatoms); DefLispVar ("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\ Each element is a list of all interned symbols whose names hash in that bucket."); DefLispVar ("values", &Vvalues, "List of values of all expressions which were read, evaluated and printed.\n\ Order is reverse chronological."); DefLispVar ("standard-input", &Vstandard_input, "Stream for read to get input from.\n\ See documentation of read for possible values."); Vstandard_input = Qt; DefLispVar ("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 in by file paths.h when emacs was built."); DefBoolVar ("load-in-progress", &load_in_progress, "Non-nil iff inside of load."); 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); unrch = -1; }