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a system call or other foreign function. Many thanks to Tim Pierce! * symbols.h (SCM_COERCE_SUBSTR): new macro. * filesys.c (scm_chmod, scm_rename, scm_delete_file, scm_mkdir, scm_rmdir, scm_opendir, scm_chdir, scm_symlink, scm_readlink, scm_lstat), ports.c (scm_sys_make_void_port), posix.c (scm_utime, scm_putenv, scm_setlocale, scm_mknod), stime.c (setzone, scm_strftime), vports.c (scm_make_soft_port), backtrace.c (scm_display_error_message): use RO macros when strings may be RO. * error.c (scm_error_scm), filesys.c (scm_chown, scm_chmod, scm_rename, scm_delete_file, scm_mkdir, scm_rmdir, scm_opendir, scm_chdir, scm_symlink, scm_readlink, scm_lstat), ioext.c (scm_freopen, scm_duplicate_port, scm_fdopen), net_db.c (scm_gethost, scm_getnet, scm_getproto, scm_getserv), ports.c (scm_sys_make_void_port), posix.c (scm_getgrgid, scm_utime, scm_setlocale, scm_mknod), stime.c (setzone, scm_strptime, scm_strftime), vports.c (scm_make_soft_port): use SCM_COERCE_SUBSTR to make sure shared substrings are null-terminated.
139 lines
6.2 KiB
C
139 lines
6.2 KiB
C
/* classes: h_files */
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#ifndef SYMBOLSH
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#define SYMBOLSH
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/* Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*/
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#include "libguile/__scm.h"
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extern int scm_symhash_dim;
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/* SCM_LENGTH(SYM) is the length of SYM's name in characters, and
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SCM_CHARS(SYM) is the address of the first character of SYM's name.
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Beyond that, there are two kinds of symbols: ssymbols and msymbols,
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distinguished by the 'S' bit in the type.
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Ssymbols are just uniquified strings. They have a length, chars,
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and that's it. They use the scm_tc7_ssymbol tag (S bit clear).
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Msymbols are symbols with extra slots. These slots hold a property
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list and a function value (for Emacs Lisp compatibility), a hash
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code, and a flag to indicate whether their name contains multibyte
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characters. They use the scm_tc7_msymbol tag.
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We'd like SCM_CHARS to work on msymbols just as it does on
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ssymbols, so we'll have it point to the symbol's name as usual, and
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store a pointer to the slots just before the name in memory. Thus,
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you have to do some casting and pointer arithmetic to find the
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slots; see the SCM_SLOTS macro.
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In practice, the slots always live just before the pointer to them.
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So why not ditch the pointer, and use negative indices to refer to
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the slots? That's a good question; ask the author. I think it was
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the cognac. */
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#define SCM_SYMBOLP(x) (SCM_TYP7S(x)==scm_tc7_ssymbol)
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#define SCM_LENGTH(x) (((unsigned long)SCM_CAR(x))>>8)
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#define SCM_LENGTH_MAX (0xffffffL)
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#define SCM_SETLENGTH(x, v, t) SCM_SETCAR((x), ((v)<<8)+(t))
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#define SCM_SETCHARS SCM_SETCDR
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#define SCM_CHARS(x) ((char *)(SCM_CDR(x)))
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#define SCM_UCHARS(x) ((unsigned char *)(SCM_CDR(x)))
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#define SCM_SLOTS(x) ((SCM *) (* ((SCM *)SCM_CHARS(x) - 1)))
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#define SCM_SYMBOL_SLOTS 5
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#define SCM_SYMBOL_FUNC(X) (SCM_SLOTS(X)[0])
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#define SCM_SYMBOL_PROPS(X) (SCM_SLOTS(X)[1])
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#define SCM_SYMBOL_HASH(X) (*(unsigned long*)(&SCM_SLOTS(X)[2]))
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#define SCM_SYMBOL_MULTI_BYTE_STRINGP(X) (*(unsigned long*)(&SCM_SLOTS(X)[3]))
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#define SCM_ROSTRINGP(x) ((SCM_TYP7SD(x)==scm_tc7_string) || (SCM_TYP7S(x) == scm_tc7_ssymbol))
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#define SCM_ROCHARS(x) ((SCM_TYP7(x) == scm_tc7_substring) \
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? SCM_INUM (SCM_CADR (x)) + SCM_CHARS (SCM_CDDR (x)) \
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: SCM_CHARS (x))
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#define SCM_ROUCHARS(x) ((SCM_TYP7(x) == scm_tc7_substring) \
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? SCM_INUM (SCM_CADR (x)) + SCM_UCHARS (SCM_CDDR (x)) \
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: SCM_UCHARS (x))
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#define SCM_ROLENGTH(x) SCM_LENGTH (x)
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#define SCM_SUBSTRP(x) ((SCM_TYP7S(x) == scm_tc7_substring))
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#define SCM_SUBSTR_STR(x) (SCM_CDDR (x))
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#define SCM_SUBSTR_OFFSET(x) (SCM_CADR (x))
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#define SCM_COERCE_SUBSTR(x) { if (SCM_SUBSTRP (x)) \
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x = scm_makfromstr (SCM_ROCHARS (x), \
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SCM_ROLENGTH (x), 0); }
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extern unsigned long scm_strhash SCM_P ((unsigned char *str, scm_sizet len, unsigned long n));
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extern SCM scm_sym2vcell SCM_P ((SCM sym, SCM thunk, SCM definep));
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extern SCM scm_sym2ovcell_soft SCM_P ((SCM sym, SCM obarray));
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extern SCM scm_sym2ovcell SCM_P ((SCM sym, SCM obarray));
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extern SCM scm_intern_obarray_soft SCM_P ((char *name, scm_sizet len, SCM obarray, int softness));
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extern SCM scm_intern_obarray SCM_P ((char *name, scm_sizet len, SCM obarray));
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extern SCM scm_intern SCM_P ((char *name, scm_sizet len));
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extern SCM scm_intern0 SCM_P ((char * name));
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extern SCM scm_sysintern SCM_P ((char *name, SCM val));
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extern SCM scm_sysintern0 SCM_P ((char *name));
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extern SCM scm_symbol_value0 SCM_P ((char *name));
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extern SCM scm_symbol_p SCM_P ((SCM x));
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extern SCM scm_symbol_to_string SCM_P ((SCM s));
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extern SCM scm_string_to_symbol SCM_P ((SCM s));
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extern SCM scm_string_to_obarray_symbol SCM_P ((SCM o, SCM s, SCM softp));
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extern SCM scm_intern_symbol SCM_P ((SCM o, SCM s));
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extern SCM scm_unintern_symbol SCM_P ((SCM o, SCM s));
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extern SCM scm_symbol_binding SCM_P ((SCM o, SCM s));
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extern SCM scm_symbol_interned_p SCM_P ((SCM o, SCM s));
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extern SCM scm_symbol_bound_p SCM_P ((SCM o, SCM s));
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extern SCM scm_symbol_set_x SCM_P ((SCM o, SCM s, SCM v));
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extern SCM scm_symbol_fref SCM_P ((SCM s));
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extern SCM scm_symbol_pref SCM_P ((SCM s));
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extern SCM scm_symbol_fset_x SCM_P ((SCM s, SCM val));
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extern SCM scm_symbol_pset_x SCM_P ((SCM s, SCM val));
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extern SCM scm_symbol_hash SCM_P ((SCM s));
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extern void scm_init_symbols SCM_P ((void));
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extern int scm_can_use_top_level_lookup_closure_var;
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#endif /* SYMBOLSH */
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