101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
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*
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* ucs2_to_utf8.c: Converts between UCS-2 and UTF-8, both of which are used in
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* different contexts in X11.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <err.h>
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#include <iconv.h>
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#include "libi3.h"
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static iconv_t conversion_descriptor = 0;
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static iconv_t conversion_descriptor2 = 0;
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/*
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* Returns the input string, but converted from UCS-2 to UTF-8. Memory will be
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* allocated, thus the caller has to free the output.
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*
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*/
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char *convert_ucs_to_utf8(char *input) {
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size_t input_size = 2;
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/* UTF-8 may consume up to 4 byte */
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int buffer_size = 8;
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char *buffer = scalloc(buffer_size);
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size_t output_size = buffer_size;
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/* We need to use an additional pointer, because iconv() modifies it */
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char *output = buffer;
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/* We convert the input into UCS-2 big endian */
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if (conversion_descriptor == 0) {
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conversion_descriptor = iconv_open("UTF-8", "UCS-2BE");
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if (conversion_descriptor == 0)
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errx(EXIT_FAILURE, "Error opening the conversion context");
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}
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/* Get the conversion descriptor back to original state */
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iconv(conversion_descriptor, NULL, NULL, NULL, NULL);
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/* Convert our text */
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int rc = iconv(conversion_descriptor, (void*)&input, &input_size, &output, &output_size);
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if (rc == (size_t)-1) {
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free(buffer);
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perror("Converting to UCS-2 failed");
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return NULL;
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}
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return buffer;
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}
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/*
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* Converts the given string to UCS-2 big endian for use with
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* xcb_image_text_16(). The amount of real glyphs is stored in real_strlen,
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* a buffer containing the UCS-2 encoded string (16 bit per glyph) is
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* returned. It has to be freed when done.
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*
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*/
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char *convert_utf8_to_ucs2(char *input, int *real_strlen) {
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size_t input_size = strlen(input) + 1;
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/* UCS-2 consumes exactly two bytes for each glyph */
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int buffer_size = input_size * 2;
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char *buffer = smalloc(buffer_size);
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size_t output_size = buffer_size;
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/* We need to use an additional pointer, because iconv() modifies it */
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char *output = buffer;
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/* We convert the input into UCS-2 big endian */
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if (conversion_descriptor2 == 0) {
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conversion_descriptor2 = iconv_open("UCS-2BE", "UTF-8");
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if (conversion_descriptor2 == 0)
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errx(EXIT_FAILURE, "Error opening the conversion context");
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}
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/* Get the conversion descriptor back to original state */
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iconv(conversion_descriptor2, NULL, NULL, NULL, NULL);
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/* Convert our text */
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int rc = iconv(conversion_descriptor2, (void*)&input, &input_size, &output, &output_size);
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if (rc == (size_t)-1) {
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perror("Converting to UCS-2 failed");
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free(buffer);
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if (real_strlen != NULL)
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*real_strlen = 0;
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return NULL;
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}
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if (real_strlen != NULL)
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*real_strlen = ((buffer_size - output_size) / 2) - 1;
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return buffer;
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}
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