Initial commit

engines/glk/scott/layout_text.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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/>.
+ *
+ */
+
+/*
+ * Based on ScottFree interpreter version 1.14 developed by Swansea
+ * University Computer Society without disassembly of any other game
+ * drivers, only of game databases as permitted by EEC law (for purposes
+ * of compatibility).
+ *
+ * Licensed under GPLv2
+ *
+ * https://github.com/angstsmurf/spatterlight/tree/master/terps/scott
+ */
+
+#include "common/util.h"
+#include "glk/scott/layout_text.h"
+
+namespace Glk {
+namespace Scott {
+
+int findBreak(const char *buf, int pos, int columns) {
+	int diff = 0;
+
+	while (diff < columns && !Common::isSpace((unsigned char)buf[pos])) {
+		pos--;
+		diff++;
+	}
+
+	if (diff >= columns || diff < 1) /* Found no space */ {
+		return -1;
+	}
+
+	return diff;
+}
+
+/* Breaks a null-terminated string up by inserting newlines, moving words
+ down to the next line when reaching the end of the line */
+char *lineBreakText(char *source, int columns, int *rows, int *length) {
+	columns -= 1;
+
+	char *result = nullptr;
+	char buf[768];
+	int col = 0;
+	int row = 0;
+	int sourcepos = 0;
+	int destpos = 0;
+	int diff = 0;
+	*rows = 0;
+	while (source[sourcepos] != '\0') {
+		while (col < columns && source[sourcepos] != '\0') {
+			if (source[sourcepos] == 10 || source[sourcepos] == 13) {
+				/* Found a line break. */
+				/* Any spaces before a line break may cause trouble, */
+				/* so we delete them */
+				while (destpos && buf[destpos - 1] == ' ') {
+					destpos--;
+				}
+				col = 0;
+				row++;
+			} else {
+				col++;
+			}
+
+			buf[destpos++] = source[sourcepos++];
+
+			if (source[sourcepos] == 10 || source[sourcepos] == 13)
+				col--;
+		}
+
+		/* We have reached the end of a line */
+		row++;
+		col = 0;
+
+		if (source[sourcepos] == '\0') {
+			break;
+		}
+
+		diff = findBreak(source, sourcepos, columns);
+		if (diff > -1) { /* We found a suitable break */
+			sourcepos = sourcepos - diff;
+			destpos = destpos - diff;
+			buf[destpos++] = '\n';
+
+			if (Common::isSpace((unsigned char)source[sourcepos])) {
+				sourcepos++;
+			}
+		}
+	}
+	*rows = row;
+	*length = 0;
+	result = new char[destpos + 1];
+	if (result == nullptr)
+		return nullptr;
+	memcpy(result, buf, destpos);
+	result[destpos] = '\0';
+	*length = destpos;
+	return result;
+}
+
+} // End of namespace Scott
+} // End of namespace Glk