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Diffstat (limited to 'libguile/smob.c')
-rw-r--r-- | libguile/smob.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/libguile/smob.c b/libguile/smob.c new file mode 100644 index 000000000..4843d486f --- /dev/null +++ b/libguile/smob.c @@ -0,0 +1,134 @@ +/* Copyright (C) 1995,1996 Free Software Foundation, Inc. + * + * This program 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. + * + * This program 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 this software; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + * As a special exception, the Free Software Foundation gives permission + * for additional uses of the text contained in its release of GUILE. + * + * The exception is that, if you link the GUILE library with other files + * to produce an executable, this does not by itself cause the + * resulting executable to be covered by the GNU General Public License. + * Your use of that executable is in no way restricted on account of + * linking the GUILE library code into it. + * + * This exception does not however invalidate any other reasons why + * the executable file might be covered by the GNU General Public License. + * + * This exception applies only to the code released by the + * Free Software Foundation under the name GUILE. If you copy + * code from other Free Software Foundation releases into a copy of + * GUILE, as the General Public License permits, the exception does + * not apply to the code that you add in this way. To avoid misleading + * anyone as to the status of such modified files, you must delete + * this exception notice from them. + * + * If you write modifications of your own for GUILE, it is your choice + * whether to permit this exception to apply to your modifications. + * If you do not wish that, delete this exception notice. + */ + + +#include <stdio.h> +#include "_scm.h" +#ifdef HAVE_MALLOC_H +#include <malloc.h> +#endif + + + +/* scm_smobs scm_numsmob + * implement a dynamicly resized array of smob records. + * Indexes into this table are used when generating type + * tags for smobjects (if you know a tag you can get an index and conversely). + */ +scm_sizet scm_numsmob; +scm_smobfuns *scm_smobs; + +#ifdef __STDC__ +long +scm_newsmob (scm_smobfuns *smob) +#else +long +scm_newsmob (smob) + scm_smobfuns *smob; +#endif +{ + char *tmp; + if (255 <= scm_numsmob) + goto smoberr; + SCM_DEFER_INTS; + SCM_SYSCALL (tmp = (char *) realloc ((char *) scm_smobs, (1 + scm_numsmob) * sizeof (scm_smobfuns))); + if (tmp) + { + scm_smobs = (scm_smobfuns *) tmp; + scm_smobs[scm_numsmob].mark = smob->mark; + scm_smobs[scm_numsmob].free = smob->free; + scm_smobs[scm_numsmob].print = smob->print; + scm_smobs[scm_numsmob].equalp = smob->equalp; + scm_numsmob++; + } + SCM_ALLOW_INTS; + if (!tmp) + smoberr:scm_wta (SCM_MAKINUM ((long) scm_numsmob), (char *) SCM_NALLOC, "newsmob"); + return scm_tc7_smob + (scm_numsmob - 1) * 256; +} + +/* {Initialization for i/o types, float, bignum, the type of free cells} + */ + +static scm_smobfuns freecell = +{ + scm_mark0, + scm_free0, + 0, + 0 +}; + +static scm_smobfuns flob = +{ + scm_mark0, + /*flofree*/ 0, + scm_floprint, + scm_floequal +}; + +static scm_smobfuns bigob = +{ + scm_mark0, + /*bigfree*/ 0, + scm_bigprint, + scm_bigequal +}; + + + +#ifdef __STDC__ +void +scm_smob_prehistory (void) +#else +void +scm_smob_prehistory () +#endif +{ + scm_numsmob = 0; + scm_smobs = (scm_smobfuns *) malloc (7 * sizeof (scm_smobfuns)); + + /* WARNING: These scm_newsmob calls must be done in this order */ + scm_newsmob (&freecell); + scm_newsmob (&flob); + scm_newsmob (&bigob); + scm_newsmob (&bigob); /* n.b.: two smobs, one smobfuns */ +} + |