146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
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* Solanum: a slightly advanced ircd
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* substitution.c: parses substitution-keyword expansions
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*
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* Copyright (c) 2006-2007 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "stdinc.h"
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#include "s_user.h"
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#include "snomask.h"
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#include "match.h"
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#include "substitution.h"
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#include "s_assert.h"
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/*
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* Simple mappings for $foo -> 'bar'.
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* Everything is a string, so typing doesn't really matter too
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* horribly much right now.
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*/
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struct substitution_variable
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{
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char *name;
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char *value;
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};
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/*
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* substitution_append_var
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*
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* Inputs - A variable list (rb_dlink_list), name -> value for mapping to make
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* Output - none
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* Side Effects - Adds a name->value mapping to a list.
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*/
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void substitution_append_var(rb_dlink_list *varlist, const char *name, const char *value)
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{
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struct substitution_variable *tmp = rb_malloc(sizeof(struct substitution_variable));
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tmp->name = rb_strdup(name);
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tmp->value = rb_strdup(value);
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rb_dlinkAddAlloc(tmp, varlist);
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}
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/*
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* substitution_free
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*
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* Inputs - A rb_dlink_list of markup variables to free.
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* Outputs - none
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* Side Effects - Empties a list of markup variables.
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*/
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void substitution_free(rb_dlink_list *varlist)
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{
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rb_dlink_node *nptr, *nptr2;
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RB_DLINK_FOREACH_SAFE(nptr, nptr2, varlist->head)
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{
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struct substitution_variable *tmp = (struct substitution_variable *) nptr->data;
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rb_dlinkDestroy(nptr, varlist);
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rb_free(tmp->name);
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rb_free(tmp->value);
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rb_free(tmp);
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}
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}
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/*
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* substitution_parse
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*
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* Inputs - A markup string, rb_dlink-list of markup values
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* Output - A string which has been markup-replaced.
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* Side Effects - Strings larger than BUFSIZE are terminated.
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*/
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char *substitution_parse(const char *fmt, rb_dlink_list *varlist)
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{
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static char buf[BUFSIZE];
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const char *ptr;
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char *bptr = buf;
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for (ptr = fmt; *ptr != '\0' && bptr - buf < BUFSIZE; ptr++) {
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if (*ptr != '$') {
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*bptr++ = *ptr;
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} else if (*(ptr + 1) == '{') {
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char varname[BUFSIZE] = { 0 };
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char *vptr = varname;
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rb_dlink_node *nptr;
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/* break out ${var} */
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for (ptr += 2; *ptr != '\0'; ptr++) {
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if (*ptr == '$') {
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ptr--;
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break;
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} else if (*ptr == '}') {
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break;
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} else if (vptr < &varname[sizeof(varname) - 1]) {
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*vptr++ = *ptr;
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}
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}
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RB_DLINK_FOREACH(nptr, varlist->head) {
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struct substitution_variable *val = (struct substitution_variable *) nptr->data;
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if (!rb_strcasecmp(varname, val->name)) {
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rb_strlcpy(bptr, val->value, sizeof(buf) - (bptr - buf));
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bptr += strlen(val->value);
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if (bptr >= &buf[sizeof(buf)]) {
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bptr = &buf[sizeof(buf) - 1];
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}
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break;
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}
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}
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/* don't increment ptr into a following string if the '}' is missing */
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if (*ptr == '\0')
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break;
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}
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}
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*bptr = '\0';
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return buf;
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}
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