2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
16 static iconv_t utf8_conversion_descriptor = (iconv_t)-1;
17 static iconv_t ucs2_conversion_descriptor = (iconv_t)-1;
20 * Converts the given string to UTF-8 from UCS-2 big endian. The return value
21 * must be freed after use.
24 char *convert_ucs2_to_utf8(xcb_char2b_t *text, size_t num_glyphs) {
25 /* Allocate the output buffer (UTF-8 is at most 4 bytes per glyph) */
26 size_t buffer_size = num_glyphs * 4 + 1;
27 char *buffer = scalloc(buffer_size, 1);
29 /* We need to use an additional pointer, because iconv() modifies it */
30 char *output = buffer;
31 size_t output_size = buffer_size - 1;
33 if (utf8_conversion_descriptor == (iconv_t)-1) {
34 /* Get a new conversion descriptor */
35 utf8_conversion_descriptor = iconv_open("UTF-8", "UCS-2BE");
36 if (utf8_conversion_descriptor == (iconv_t)-1)
37 err(EXIT_FAILURE, "Error opening the conversion context");
39 /* Reset the existing conversion descriptor */
40 iconv(utf8_conversion_descriptor, NULL, NULL, NULL, NULL);
43 /* Do the conversion */
44 size_t input_len = num_glyphs * sizeof(xcb_char2b_t);
45 size_t rc = iconv(utf8_conversion_descriptor, (char **)&text,
46 &input_len, &output, &output_size);
47 if (rc == (size_t)-1) {
48 perror("Converting to UTF-8 failed");
57 * Converts the given string to UCS-2 big endian for use with
58 * xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
59 * a buffer containing the UCS-2 encoded string (16 bit per glyph) is
60 * returned. It has to be freed when done.
63 xcb_char2b_t *convert_utf8_to_ucs2(char *input, size_t *real_strlen) {
64 /* Calculate the input buffer size (UTF-8 is strlen-safe) */
65 size_t input_size = strlen(input);
67 /* Calculate the output buffer size and allocate the buffer */
68 size_t buffer_size = input_size * sizeof(xcb_char2b_t);
69 xcb_char2b_t *buffer = smalloc(buffer_size);
71 /* We need to use an additional pointer, because iconv() modifies it */
72 size_t output_bytes_left = buffer_size;
73 xcb_char2b_t *output = buffer;
75 if (ucs2_conversion_descriptor == (iconv_t)-1) {
76 /* Get a new conversion descriptor. //IGNORE is a GNU suffix that makes
77 * iconv to silently discard characters that cannot be represented in
78 * the target character set. */
79 ucs2_conversion_descriptor = iconv_open("UCS-2BE//IGNORE", "UTF-8");
80 if (ucs2_conversion_descriptor == (iconv_t)-1) {
81 ucs2_conversion_descriptor = iconv_open("UCS-2BE", "UTF-8");
83 if (ucs2_conversion_descriptor == (iconv_t)-1) {
84 err(EXIT_FAILURE, "Error opening the conversion context");
87 /* Reset the existing conversion descriptor */
88 iconv(ucs2_conversion_descriptor, NULL, NULL, NULL, NULL);
91 /* Do the conversion */
92 size_t rc = iconv(ucs2_conversion_descriptor, &input, &input_size,
93 (char **)&output, &output_bytes_left);
94 if (rc == (size_t)-1) {
95 /* Conversion will only be partial. */
96 perror("Converting to UCS-2 failed");
99 /* If no bytes where converted, this is equivalent to freeing buffer. */
100 buffer_size -= output_bytes_left;
101 buffer = srealloc(buffer, buffer_size);
103 /* Return the resulting string's length */
104 if (real_strlen != NULL) {
105 *real_strlen = buffer_size / sizeof(xcb_char2b_t);