From 1dc3fd7bf000b57f8462416ae3e17f2f580d2020 Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <michael@stapelberg.de>
Date: Fri, 16 Jul 2010 17:35:51 +0200
Subject: Initial commit of the XCB rewrite of i3lock

Changes:
- Uses XCB instead of Xlib (like i3), thus cleaner/faster code
- Uses cairo to load PNG images (*much* faster than XPM)
---
 ucs2_to_utf8.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 ucs2_to_utf8.c

(limited to 'ucs2_to_utf8.c')

diff --git a/ucs2_to_utf8.c b/ucs2_to_utf8.c
new file mode 100644
index 0000000..4624ee6
--- /dev/null
+++ b/ucs2_to_utf8.c
@@ -0,0 +1,111 @@
+/*
+ * vim:ts=8:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ *
+ * © 2009-2010 Michael Stapelberg and contributors
+ *
+ * See file LICENSE for license information.
+ *
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <err.h>
+#include <iconv.h>
+
+static iconv_t conversion_descriptor = 0;
+static iconv_t conversion_descriptor2 = 0;
+
+/* isutf, u8_dec © 2005 Jeff Bezanson, public domain */
+#define isutf(c) (((c) & 0xC0) != 0x80)
+
+/*
+ * Decrements i to point to the previous unicode glyph
+ *
+ */
+void u8_dec(char *s, int *i) {
+    (void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || isutf(s[--(*i)]) || --(*i));
+}
+
+/*
+ * Returns the input string, but converted from UCS-2 to UTF-8. Memory will be
+ * allocated, thus the caller has to free the output.
+ *
+ */
+int convert_ucs_to_utf8(char *input, char *output) {
+	size_t input_size = 2;
+
+	/* UTF-8 may consume up to 4 byte */
+	size_t output_size = 8;
+	/* We need to use an additional pointer, because iconv() modifies it */
+	char *outptr = output;
+
+	/* We convert the input into UCS-2 big endian */
+        if (conversion_descriptor == 0) {
+                conversion_descriptor = iconv_open("UTF-8", "UCS-2BE");
+                if (conversion_descriptor == 0) {
+                        fprintf(stderr, "error opening the conversion context\n");
+                        exit(1);
+                }
+        }
+
+	/* Get the conversion descriptor back to original state */
+	iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
+
+	/* Convert our text */
+	int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &outptr, &output_size);
+        if (rc == (size_t)-1) {
+                perror("Converting to UCS-2 failed");
+                return 0;
+	}
+
+	return (8 - output_size);
+}
+
+/*
+ * Converts the given string to UCS-2 big endian for use with
+ * xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
+ * a buffer containing the UCS-2 encoded string (16 bit per glyph) is
+ * returned. It has to be freed when done.
+ *
+ */
+char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
+	size_t input_size = strlen(input) + 1;
+	/* UCS-2 consumes exactly two bytes for each glyph */
+	int buffer_size = input_size * 2;
+
+	char *buffer = malloc(buffer_size);
+        if (buffer == NULL)
+                err(EXIT_FAILURE, "malloc() failed\n");
+	size_t output_size = buffer_size;
+	/* We need to use an additional pointer, because iconv() modifies it */
+	char *output = buffer;
+
+	/* We convert the input into UCS-2 big endian */
+        if (conversion_descriptor2 == 0) {
+                conversion_descriptor2 = iconv_open("UCS-2BE", "UTF-8");
+                if (conversion_descriptor2 == 0) {
+                        fprintf(stderr, "error opening the conversion context\n");
+                        exit(1);
+                }
+        }
+
+	/* Get the conversion descriptor back to original state */
+	iconv(conversion_descriptor2, NULL, NULL, NULL, NULL);
+
+	/* Convert our text */
+	int rc = iconv(conversion_descriptor2, (void*)&input, &input_size, &output, &output_size);
+        if (rc == (size_t)-1) {
+                perror("Converting to UCS-2 failed");
+                if (real_strlen != NULL)
+		        *real_strlen = 0;
+                return NULL;
+	}
+
+        if (real_strlen != NULL)
+	        *real_strlen = ((buffer_size - output_size) / 2) - 1;
+
+	return buffer;
+}
+
-- 
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