contrib/flex/filter.c

31 /** global chain. */
35  * @param chain the current chain or NULL for new chain
39  * @return newest filter in chain
41 struct filter *filter_create_ext (struct filter *chain, const char *cmd,
59 	if (chain != NULL) {
60 		/* append f to end of chain */
61 		while (chain->next)
62 			chain = chain->next;
63 		chain->next = f;
96  * @param chain the current chain or NULL for new chain
101  * @return newest filter in chain
103 struct filter *filter_create_int (struct filter *chain,
121 	if (chain != NULL) {
122 		/* append f to end of chain */
123 		while (chain->next)
124 			chain = chain->next;
125 		chain->next = f;
131 /** Fork and exec entire filter chain.
132  *  @param chain The head of the chain.
135 bool filter_apply_chain (struct filter * chain)
140 	/* Tricky recursion, since we want to begin the chain
144 	if (chain)
145 		filter_apply_chain (chain->next);
149 	/* Now we are the right-most unprocessed link in the chain.
179 		if (chain->filter_func) {
182 			if ((r = chain->filter_func (chain)) == -1)
187 			execvp (chain->argv[0],
188 				(char **const) (chain->argv));
190                     chain->argv[0]);
206 /** Truncate the chain to max_len number of filters.
207  * @param chain the current chain.
208  * @param max_len the maximum length of the chain.
209  * @return the resulting length of the chain.
211 int filter_truncate (struct filter *chain, int max_len)
215 	if (!chain)
218 	while (chain->next && len < max_len) {
219 		chain = chain->next;
223 	chain->next = NULL;
227 /** Splits the chain in order to write to a header file.
232 int filter_tee_header (struct filter *chain)
244 	write_header = (chain->extra != NULL);
247 	 * through the running chain. Then create a new pipe to the H file as
248 	 * stdout, and fork the rest of the chain again.
256 		if (freopen ((char *) chain->extra, "w", stdout) == NULL)
259 		filter_apply_chain (chain->next);
313 				(char *) chain->extra);
317 				(char *) chain->extra);
341 int filter_fix_linedirs (struct filter *chain)
349 	if (!chain)