63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
#include "utf8.h"
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int
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codepoint_to_utf8(Eina_Unicode g, char *txt)
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{
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if (g < (1 << (7)))
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{ // 0xxxxxxx
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txt[0] = g & 0x7f;
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txt[1] = 0;
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return 1;
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}
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else if (g < (1 << (5 + 6)))
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{ // 110xxxxx 10xxxxxx
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txt[0] = 0xc0 | ((g >> 6) & 0x1f);
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txt[1] = 0x80 | ((g ) & 0x3f);
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txt[2] = 0;
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return 2;
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}
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else if (g < (1 << (4 + 6 + 6)))
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{ // 1110xxxx 10xxxxxx 10xxxxxx
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txt[0] = 0xe0 | ((g >> 12) & 0x0f);
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txt[1] = 0x80 | ((g >> 6 ) & 0x3f);
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txt[2] = 0x80 | ((g ) & 0x3f);
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txt[3] = 0;
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return 3;
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}
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else if (g < (1 << (3 + 6 + 6 + 6)))
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{ // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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txt[0] = 0xf0 | ((g >> 18) & 0x07);
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txt[1] = 0x80 | ((g >> 12) & 0x3f);
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txt[2] = 0x80 | ((g >> 6 ) & 0x3f);
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txt[3] = 0x80 | ((g ) & 0x3f);
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txt[4] = 0;
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return 4;
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}
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else if (g < (1 << (2 + 6 + 6 + 6 + 6)))
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{ // 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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txt[0] = 0xf8 | ((g >> 24) & 0x03);
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txt[1] = 0x80 | ((g >> 18) & 0x3f);
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txt[2] = 0x80 | ((g >> 12) & 0x3f);
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txt[3] = 0x80 | ((g >> 6 ) & 0x3f);
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txt[4] = 0x80 | ((g ) & 0x3f);
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txt[5] = 0;
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return 5;
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}
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else if ((unsigned int)g < (unsigned int)(1 << (1 + 6 + 6 + 6 + 6 + 6)))
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{ // 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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txt[0] = 0xfc | ((g >> 30) & 0x01);
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txt[1] = 0x80 | ((g >> 24) & 0x3f);
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txt[2] = 0x80 | ((g >> 18) & 0x3f);
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txt[3] = 0x80 | ((g >> 12) & 0x3f);
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txt[4] = 0x80 | ((g >> 6 ) & 0x3f);
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txt[5] = 0x80 | ((g ) & 0x3f);
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txt[6] = 0;
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return 6;
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}
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else
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{ // error - cant encode this in utf8
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txt[0] = 0;
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return 0;
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}
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}
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