text_*(): New functions

3 files changed, 132 insertions, 1 deletions

diff --git a/src/local.mk b/src/local.mk
index f6a381d..397a9a2 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -1,3 +1,4 @@
 fbcon2png_SOURCES += \
 	%reldir%/image.c \
-	%reldir%/main.c
+	%reldir%/main.c \
+	%reldir%/text.c
diff --git a/src/text.c b/src/text.c
new file mode 100644
index 0000000..68d86eb
--- /dev/null
+++ b/src/text.c
@@ -0,0 +1,91 @@
+/*
+ * Text layout and parsing functions
+ *
+ * Copyright (C) 2019  Patrick McDermott
+ *
+ * This file is part of fbcon2png.
+ *
+ * fbcon2png 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.
+ *
+ * fbcon2png 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 fbcon2png.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "text.h"
+
+#include <stdlib.h>
+
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+
+struct text {
+	const char *string;
+	int         width;
+	int         height;
+};
+
+struct text *
+text_new(const char *string)
+{
+	struct text *text;
+	int          width;
+
+	if (!string) {
+		return NULL;
+	}
+	text = calloc(1, sizeof(*text));
+	if (!text) {
+		return NULL;
+	}
+
+	text->string = string;
+
+	width = 0;
+	while (string && *string) {
+		if (*string == 0x1B && *(string + 1) == '[') {  /* CSI */
+			string += 2;
+			for (; *string >= 0x30 && *string <= 0x3F; ++string);
+			for (; *string >= 0x20 && *string <= 0x2F; ++string);
+			if (*string >= 0x40 && *string <= 0x7E) {
+				++string;
+			}
+		} else if (*string == '\n') {
+			text->width = MAX(text->width, width);
+			++text->height;
+		} else {
+			++width;
+		}
+	}
+
+	return text;
+}
+
+int
+text_get_width(struct text *text)
+{
+	return text->width;
+}
+
+int
+text_get_height(struct text *text)
+{
+	return text->height;
+}
+
+struct text *
+text_destroy(struct text **text_p)
+{
+	struct text *text;
+
+	text = *text_p;
+
+	free(text);
+	return text = NULL;
+}
diff --git a/src/text.h b/src/text.h
new file mode 100644
index 0000000..0671bb6
--- /dev/null
+++ b/src/text.h
@@ -0,0 +1,39 @@
+/*
+ * Text layout and parsing functions
+ *
+ * Copyright (C) 2019  Patrick McDermott
+ *
+ * This file is part of fbcon2png.
+ *
+ * fbcon2png 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.
+ *
+ * fbcon2png 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 fbcon2png.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TEXT_H
+#define TEXT_H
+
+struct text;
+
+struct text *
+text_new(const char *string);
+
+int
+text_get_width(struct text *text) __attribute__((pure));
+
+int
+text_get_height(struct text *text) __attribute__((pure));
+
+struct text *
+text_destroy(struct text **text_p);
+
+#endif  /* TEXT_H */