usr.bin/mg/undo.c

90 	struct undo_rec *rec;
92 	rec = TAILQ_FIRST(&undo_free);
93 	if (rec != NULL) {
95 		TAILQ_REMOVE(&undo_free, rec, next);
98 		if ((rec = malloc(sizeof(*rec))) == NULL)
101 	memset(rec, 0, sizeof(struct undo_rec));
103 	return (rec);
107 free_undo_record(struct undo_rec *rec)
118 	free(rec->content);
119 	rec->content = NULL;
121 		free(rec);
126 	TAILQ_INSERT_HEAD(&undo_free, rec, next);
136 	struct undo_rec *rec;
138 	rec = TAILQ_LAST(&curbp->b_undo, undoq);
139 	if (rec != NULL) {
141 		TAILQ_REMOVE(&curbp->b_undo, rec, next);
142 		free_undo_record(rec);
151 	struct undo_rec *rec;
153 	if ((rec = TAILQ_FIRST(&curbp->b_undo)) != NULL)
154 		return (rec->type);
223 	struct undo_rec *rec;
233 	rec = new_undo_record();
234 	rec->type = BOUNDARY;
236 	TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next);
247 	struct undo_rec *rec, *trec;
249 	TAILQ_FOREACH_SAFE(rec, &curbp->b_undo, next, trec)
250 		if (rec->type == MODIFIED) {
251 			TAILQ_REMOVE(&curbp->b_undo, rec, next);
252 			free_undo_record(rec);
255 	rec = new_undo_record();
256 	rec->type = MODIFIED;
258 	TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next);
267 	struct	undo_rec *rec;
283 	rec = TAILQ_FIRST(&curbp->b_undo);
284 	if (rec != NULL && rec->type == INSERT) {
285 		if (rec->pos + rec->region.r_size == pos) {
286 			rec->region.r_size += reg.r_size;
294 	rec = new_undo_record();
295 	rec->pos = pos;
296 	rec->type = INSERT;
297 	memmove(&rec->region, &reg, sizeof(struct region));
298 	rec->content = NULL;
302 	TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next);
314 	struct	undo_rec *rec;
329 	else if ((rec = TAILQ_FIRST(&curbp->b_undo)) != NULL) {
334 		if (!isreg && rec->type == DELETE) {
335 			if (rec->pos - rec->region.r_size != pos)
339 	rec = new_undo_record();
340 	rec->pos = pos;
342 		rec->type = DELREG;
344 		rec->type = DELETE;
345 	memmove(&rec->region, &reg, sizeof(struct region));
347 		rec->content = malloc(reg.r_size + 1);
348 	} while ((rec->content == NULL) && drop_oldest_undo_record());
350 	if (rec->content == NULL)
353 	region_get_data(&reg, rec->content, reg.r_size);
358 	TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next);
387 	struct	 undo_rec *rec;
411 	TAILQ_FOREACH(rec, &curbp->b_undo, next) {
415 		    (rec->type == DELETE) ? "DELETE":
416 		    (rec->type == DELREG) ? "DELREGION":
417 		    (rec->type == INSERT) ? "INSERT":
418 		    (rec->type == BOUNDARY) ? "----" :
419 		    (rec->type == MODIFIED) ? "MODIFIED": "UNKNOWN",
420 		    rec->pos);
422 		if (rec->content) {
424 			snprintf(tmp, sizeof(tmp), "%.*s", rec->region.r_size,
425 			    rec->content);
429 		snprintf(tmp, sizeof(tmp), " [%d]", rec->region.r_size);