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27 lines
469 B
C
27 lines
469 B
C
#include "fmt.h"
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size_t fmt_utf8(char *dest,uint32_t n) {
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size_t i,j;
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if (n<=0x7f) {
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if (dest) *dest=n;
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return 1;
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}
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for (i=0x3f,j=1; i<0x7fffffff; i=(i<<5)|0x1f, ++j) {
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if (i>=n) {
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--j;
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if (dest) {
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size_t k=j*6;
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*dest++=((char)0xc0 >> (j-1)) | (n >> k);
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while (k) {
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*dest++=0x80 | ((n >> (k-6)) & 0x3f);
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k-=6;
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}
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}
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return j+1;
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}
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}
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/* we were asked to encode a value that cannot be encoded */
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return 0;
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}
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