2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
7 * ucs2_to_utf8.c: Converts between UCS-2 and UTF-8, both of which are used in
8 * different contexts in X11.
19 static iconv_t conversion_descriptor = 0;
20 static iconv_t conversion_descriptor2 = 0;
23 * Returns the input string, but converted from UCS-2 to UTF-8. Memory will be
24 * allocated, thus the caller has to free the output.
27 char *convert_ucs_to_utf8(char *input) {
28 size_t input_size = 2;
29 /* UTF-8 may consume up to 4 byte */
32 char *buffer = scalloc(buffer_size);
33 size_t output_size = buffer_size;
34 /* We need to use an additional pointer, because iconv() modifies it */
35 char *output = buffer;
37 /* We convert the input into UCS-2 big endian */
38 if (conversion_descriptor == 0) {
39 conversion_descriptor = iconv_open("UTF-8", "UCS-2BE");
40 if (conversion_descriptor == 0)
41 errx(EXIT_FAILURE, "Error opening the conversion context");
44 /* Get the conversion descriptor back to original state */
45 iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
47 /* Convert our text */
48 int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
49 if (rc == (size_t)-1) {
50 perror("Converting to UCS-2 failed");
58 * Converts the given string to UCS-2 big endian for use with
59 * xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
60 * a buffer containing the UCS-2 encoded string (16 bit per glyph) is
61 * returned. It has to be freed when done.
64 char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
65 size_t input_size = strlen(input) + 1;
66 /* UCS-2 consumes exactly two bytes for each glyph */
67 int buffer_size = input_size * 2;
69 char *buffer = smalloc(buffer_size);
70 size_t output_size = buffer_size;
71 /* We need to use an additional pointer, because iconv() modifies it */
72 char *output = buffer;
74 /* We convert the input into UCS-2 big endian */
75 if (conversion_descriptor2 == 0) {
76 conversion_descriptor2 = iconv_open("UCS-2BE", "UTF-8");
77 if (conversion_descriptor2 == 0)
78 errx(EXIT_FAILURE, "Error opening the conversion context");
81 /* Get the conversion descriptor back to original state */
82 iconv(conversion_descriptor2, NULL, NULL, NULL, NULL);
84 /* Convert our text */
85 int rc = iconv(conversion_descriptor2, (void*)&input, &input_size, &output, &output_size);
86 if (rc == (size_t)-1) {
87 perror("Converting to UCS-2 failed");
88 if (real_strlen != NULL)
93 if (real_strlen != NULL)
94 *real_strlen = ((buffer_size - output_size) / 2) - 1;