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cmdline.c

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+/*
+ * Copyright 2008-2013 Various Authors
+ * Copyright 2005 Timo Hirvonen
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cmdline.h"
+#include "uchar.h"
+#include "xmalloc.h"
+
+struct cmdline cmdline;
+
+const char cmdline_word_delimiters[]     = " ";
+const char cmdline_filename_delimiters[] = "/";
+
+void cmdline_init(void)
+{
+	cmdline.blen = 0;
+	cmdline.clen = 0;
+	cmdline.bpos = 0;
+	cmdline.cpos = 0;
+	cmdline.size = 128;
+	cmdline.line = xnew(char, cmdline.size);
+	cmdline.line[0] = 0;
+}
+
+void cmdline_insert_ch(uchar ch)
+{
+	int size;
+
+	size = u_char_size(ch);
+	if (cmdline.blen + size > cmdline.size) {
+		cmdline.size *= 2;
+		cmdline.line = xrenew(char, cmdline.line, cmdline.size);
+	}
+	memmove(cmdline.line + cmdline.bpos + size,
+		cmdline.line + cmdline.bpos,
+		cmdline.blen - cmdline.bpos + 1);
+	u_set_char_raw(cmdline.line, &cmdline.bpos, ch);
+	cmdline.cpos++;
+	cmdline.blen += size;
+	cmdline.clen++;
+}
+
+void cmdline_backspace(void)
+{
+	int bpos, size;
+
+	if (cmdline.bpos == 0)
+		return;
+
+	bpos = cmdline.bpos;
+	u_prev_char_pos(cmdline.line, &bpos);
+	size = cmdline.bpos - bpos;
+
+	memmove(cmdline.line + bpos,
+		cmdline.line + cmdline.bpos,
+		cmdline.blen - cmdline.bpos + 1);
+	cmdline.bpos -= size;
+	cmdline.cpos--;
+	cmdline.blen -= size;
+	cmdline.clen--;
+}
+
+void cmdline_backspace_to_bol(void)
+{
+	while (cmdline.bpos)
+		cmdline_backspace();
+}
+
+void cmdline_delete_ch(void)
+{
+	uchar ch;
+	int size, bpos;
+
+	if (cmdline.bpos == cmdline.blen)
+		return;
+	bpos = cmdline.bpos;
+	ch = u_get_char(cmdline.line, &bpos);
+	size = u_char_size(ch);
+	cmdline.blen -= size;
+	cmdline.clen--;
+	memmove(cmdline.line + cmdline.bpos,
+		cmdline.line + cmdline.bpos + size,
+		cmdline.blen - cmdline.bpos + 1);
+}
+
+void cmdline_set_text(const char *text)
+{
+	int len = strlen(text);
+
+	if (len >= cmdline.size) {
+		while (len >= cmdline.size)
+			cmdline.size *= 2;
+		cmdline.line = xrenew(char, cmdline.line, cmdline.size);
+	}
+	memcpy(cmdline.line, text, len + 1);
+	cmdline.cpos = u_strlen_safe(cmdline.line);
+	cmdline.bpos = len;
+	cmdline.clen = cmdline.cpos;
+	cmdline.blen = len;
+}
+
+void cmdline_clear(void)
+{
+	cmdline.blen = 0;
+	cmdline.clen = 0;
+	cmdline.bpos = 0;
+	cmdline.cpos = 0;
+	cmdline.line[0] = 0;
+}
+
+void cmdline_clear_end(void)
+{
+	cmdline.line[cmdline.bpos] = 0;
+
+	cmdline.clen = u_strlen_safe(cmdline.line);
+	cmdline.blen = strlen(cmdline.line);
+}
+
+void cmdline_move_left(void)
+{
+	if (cmdline.bpos > 0) {
+		cmdline.cpos--;
+		u_prev_char_pos(cmdline.line, &cmdline.bpos);
+	}
+}
+
+void cmdline_move_right(void)
+{
+	if (cmdline.bpos < cmdline.blen) {
+		u_get_char(cmdline.line, &cmdline.bpos);
+		cmdline.cpos++;
+	}
+}
+
+void cmdline_move_home(void)
+{
+	cmdline.cpos = 0;
+	cmdline.bpos = 0;
+}
+
+void cmdline_move_end(void)
+{
+	cmdline.cpos = cmdline.clen;
+	cmdline.bpos = cmdline.blen;
+}
+
+static int next_word(const char *str, int bpos, int *cdiff, const char *delim, int direction)
+{
+	int skip_delim = 1;
+	while ((direction > 0) ? str[bpos] : (bpos > 0)) {
+		uchar ch;
+		int oldp = bpos;
+
+		if (direction > 0) {
+			ch = u_get_char(str, &bpos);
+		} else {
+			u_prev_char_pos(str, &bpos);
+			oldp = bpos;
+			ch = u_get_char(str, &oldp);
+		}
+
+		if (u_strchr(delim, ch)) {
+			if (!skip_delim) {
+				bpos -= bpos - oldp;
+				break;
+			}
+		} else
+			skip_delim = 0;
+
+		*cdiff += direction;
+	}
+	return bpos;
+}
+
+void cmdline_forward_word(const char *delim)
+{
+	cmdline.bpos = next_word(cmdline.line, cmdline.bpos, &cmdline.cpos, delim, +1);
+}
+
+void cmdline_backward_word(const char *delim)
+{
+	cmdline.bpos = next_word(cmdline.line, cmdline.bpos, &cmdline.cpos, delim, -1);
+}
+
+void cmdline_delete_word(const char *delim)
+{
+	int bpos, cdiff = 0;
+
+	bpos = next_word(cmdline.line, cmdline.bpos, &cdiff, delim, +1);
+
+	memmove(cmdline.line + cmdline.bpos,
+		cmdline.line + bpos,
+		cmdline.blen - bpos + 1);
+	cmdline.blen -= bpos - cmdline.bpos;
+	cmdline.clen -= cdiff;
+}
+
+void cmdline_backward_delete_word(const char *delim)
+{
+	int bpos, cdiff = 0;
+
+	bpos = next_word(cmdline.line, cmdline.bpos, &cdiff, delim, -1);
+
+	cmdline.blen += bpos - cmdline.bpos;
+	memmove(cmdline.line + bpos,
+		cmdline.line + cmdline.bpos,
+		cmdline.blen - bpos + 1);
+	cmdline.bpos = bpos;
+	cmdline.clen += cdiff;
+	cmdline.cpos += cdiff;
+}