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.
18 static iconv_t conversion_descriptor = 0;
19 static iconv_t conversion_descriptor2 = 0;
22 * Returns the input string, but converted from UCS-2 to UTF-8. Memory will be
23 * allocated, thus the caller has to free the output.
26 char *convert_ucs_to_utf8(char *input) {
27 size_t input_size = 2;
28 /* UTF-8 may consume up to 4 byte */
31 char *buffer = scalloc(buffer_size);
32 size_t output_size = buffer_size;
33 /* We need to use an additional pointer, because iconv() modifies it */
34 char *output = buffer;
36 /* We convert the input into UCS-2 big endian */
37 if (conversion_descriptor == 0) {
38 conversion_descriptor = iconv_open("UTF-8", "UCS-2BE");
39 if (conversion_descriptor == 0) {
40 fprintf(stderr, "error opening the conversion context\n");
45 /* Get the conversion descriptor back to original state */
46 iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
48 /* Convert our text */
49 int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
50 if (rc == (size_t)-1) {
51 perror("Converting to UCS-2 failed");
60 * Converts the given string to UCS-2 big endian for use with
61 * xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
62 * a buffer containing the UCS-2 encoded string (16 bit per glyph) is
63 * returned. It has to be freed when done.
66 char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
67 size_t input_size = strlen(input) + 1;
68 /* UCS-2 consumes exactly two bytes for each glyph */
69 int buffer_size = input_size * 2;
71 char *buffer = smalloc(buffer_size);
72 size_t output_size = buffer_size;
73 /* We need to use an additional pointer, because iconv() modifies it */
74 char *output = buffer;
76 /* We convert the input into UCS-2 big endian */
77 if (conversion_descriptor2 == 0) {
78 conversion_descriptor2 = iconv_open("UCS-2BE", "UTF-8");
79 if (conversion_descriptor2 == 0) {
80 fprintf(stderr, "error opening the conversion context\n");
85 /* Get the conversion descriptor back to original state */
86 iconv(conversion_descriptor2, NULL, NULL, NULL, NULL);
88 /* Convert our text */
89 int rc = iconv(conversion_descriptor2, (void*)&input, &input_size, &output, &output_size);
90 if (rc == (size_t)-1) {
91 perror("Converting to UCS-2 failed");
93 if (real_strlen != NULL)
98 if (real_strlen != NULL)
99 *real_strlen = ((buffer_size - output_size) / 2) - 1;