diff options
Diffstat (limited to 'libguile/chooks.c')
-rw-r--r-- | libguile/chooks.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/libguile/chooks.c b/libguile/chooks.c new file mode 100644 index 000000000..3f50c4034 --- /dev/null +++ b/libguile/chooks.c @@ -0,0 +1,109 @@ +/* Copyright 1995-1996,1998-2001,2003,2006,2008-2009,2011,2018 + Free Software Foundation, Inc. + + This file is part of Guile. + + Guile is free software: you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Guile 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 Lesser General Public + License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with Guile. If not, see + <https://www.gnu.org/licenses/>. */ + + + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <stdio.h> + +#include "gc.h" + +#include "chooks.h" + + + +/* C level hooks + * + */ + +/* Hint for `scm_gc_malloc ()' and friends. */ +static const char hook_entry_gc_hint[] = "hook entry"; + +void +scm_c_hook_init (scm_t_c_hook *hook, void *hook_data, scm_t_c_hook_type type) +{ + hook->first = 0; + hook->type = type; + hook->data = hook_data; +} + +void +scm_c_hook_add (scm_t_c_hook *hook, + scm_t_c_hook_function func, + void *fn_data, + int appendp) +{ + scm_t_c_hook_entry *entry; + scm_t_c_hook_entry **loc = &hook->first; + + entry = scm_gc_malloc (sizeof (scm_t_c_hook_entry), hook_entry_gc_hint); + if (appendp) + while (*loc) + loc = &(*loc)->next; + entry->next = *loc; + entry->func = func; + entry->data = fn_data; + *loc = entry; +} + +void +scm_c_hook_remove (scm_t_c_hook *hook, + scm_t_c_hook_function func, + void *fn_data) +{ + scm_t_c_hook_entry **loc = &hook->first; + while (*loc) + { + if ((*loc)->func == func && (*loc)->data == fn_data) + { + *loc = (*loc)->next; + return; + } + loc = &(*loc)->next; + } + fprintf (stderr, "Attempt to remove non-existent hook function\n"); + abort (); +} + +void * +scm_c_hook_run (scm_t_c_hook *hook, void *data) +{ + scm_t_c_hook_entry *entry = hook->first; + scm_t_c_hook_type type = hook->type; + void *res = 0; + while (entry) + { + res = (entry->func) (hook->data, entry->data, data); + if (res) + { + if (type == SCM_C_HOOK_OR) + break; + } + else + { + if (type == SCM_C_HOOK_AND) + break; + } + entry = entry->next; + } + return res; +} |