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+/* $NetBSD: hist.c,v 1.10 2002/03/18 16:00:53 christos Exp $ */
+
+/*-
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Christos Zoulas of Cornell University.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "config.h"
+#if !defined(lint) && !defined(SCCSID)
+#if 0
+static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: hist.c,v 1.10 2002/03/18 16:00:53 christos Exp $");
+#endif
+#endif /* not lint && not SCCSID */
+
+/*
+ * hist.c: History access functions
+ */
+#include <stdlib.h>
+#include "el.h"
+
+/* hist_init():
+ * Initialization function.
+ */
+protected int
+hist_init(EditLine *el)
+{
+
+ el->el_history.fun = NULL;
+ el->el_history.ref = NULL;
+ el->el_history.buf = (char *) el_malloc(EL_BUFSIZ);
+ el->el_history.sz = EL_BUFSIZ;
+ if (el->el_history.buf == NULL)
+ return (-1);
+ el->el_history.last = el->el_history.buf;
+ return (0);
+}
+
+
+/* hist_end():
+ * clean up history;
+ */
+protected void
+hist_end(EditLine *el)
+{
+
+ el_free((ptr_t) el->el_history.buf);
+ el->el_history.buf = NULL;
+}
+
+
+/* hist_set():
+ * Set new history interface
+ */
+protected int
+hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr)
+{
+
+ el->el_history.ref = ptr;
+ el->el_history.fun = fun;
+ return (0);
+}
+
+
+/* hist_get():
+ * Get a history line and update it in the buffer.
+ * eventno tells us the event to get.
+ */
+protected el_action_t
+hist_get(EditLine *el)
+{
+ const char *hp;
+ int h;
+
+ if (el->el_history.eventno == 0) { /* if really the current line */
+ (void) strncpy(el->el_line.buffer, el->el_history.buf,
+ el->el_history.sz);
+ el->el_line.lastchar = el->el_line.buffer +
+ (el->el_history.last - el->el_history.buf);
+
+#ifdef KSHVI
+ if (el->el_map.type == MAP_VI)
+ el->el_line.cursor = el->el_line.buffer;
+ else
+#endif /* KSHVI */
+ el->el_line.cursor = el->el_line.lastchar;
+
+ return (CC_REFRESH);
+ }
+ if (el->el_history.ref == NULL)
+ return (CC_ERROR);
+
+ hp = HIST_FIRST(el);
+
+ if (hp == NULL)
+ return (CC_ERROR);
+
+ for (h = 1; h < el->el_history.eventno; h++)
+ if ((hp = HIST_NEXT(el)) == NULL) {
+ el->el_history.eventno = h;
+ return (CC_ERROR);
+ }
+ (void) strncpy(el->el_line.buffer, hp,
+ (size_t)(el->el_line.limit - el->el_line.buffer));
+ el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer);
+
+ if (el->el_line.lastchar > el->el_line.buffer) {
+ if (el->el_line.lastchar[-1] == '\n')
+ el->el_line.lastchar--;
+ if (el->el_line.lastchar[-1] == ' ')
+ el->el_line.lastchar--;
+ if (el->el_line.lastchar < el->el_line.buffer)
+ el->el_line.lastchar = el->el_line.buffer;
+ }
+#ifdef KSHVI
+ if (el->el_map.type == MAP_VI)
+ el->el_line.cursor = el->el_line.buffer;
+ else
+#endif /* KSHVI */
+ el->el_line.cursor = el->el_line.lastchar;
+
+ return (CC_REFRESH);
+}
+
+
+/* hist_list()
+ * List history entries
+ */
+protected int
+/*ARGSUSED*/
+hist_list(EditLine *el, int argc, const char **argv)
+{
+ const char *str;
+
+ if (el->el_history.ref == NULL)
+ return (-1);
+ for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
+ (void) fprintf(el->el_outfile, "%d %s",
+ el->el_history.ev.num, str);
+ return (0);
+}
+
+/* hist_enlargebuf()
+ * Enlarge history buffer to specified value. Called from el_enlargebufs().
+ * Return 0 for failure, 1 for success.
+ */
+protected int
+/*ARGSUSED*/
+hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
+{
+ char *newbuf;
+
+ newbuf = realloc(el->el_history.buf, newsz);
+ if (!newbuf)
+ return 0;
+
+ (void) memset(&newbuf[oldsz], '\0', newsz - oldsz);
+
+ el->el_history.last = newbuf +
+ (el->el_history.last - el->el_history.buf);
+ el->el_history.buf = newbuf;
+ el->el_history.sz = newsz;
+
+ return 1;
+}