37 lines
765 B
C
37 lines
765 B
C
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#include "./charcode.h"
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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size_t conv_charcode_utf8_to_utf32(uint32_t* c, const char* s, size_t len) {
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assert(c != NULL);
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assert(s != NULL);
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if ((*s & 0x80) == 0x00) {
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if (len < 1) return 0;
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*c = s[0];
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return 1;
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}
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if ((*s & 0xE0) == 0xC0) {
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if (len < 2) return 0;
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*c = (s[0] & 0x1F) << 6 | (s[1] & 0x3F);
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return 2;
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}
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if ((*s & 0xF0) == 0xE0) {
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if (len < 3) return 0;
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*c = (s[0] & 0x0F) << 12 | (s[1] & 0x3F) << 6 | (s[2] & 0x3F);
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return 3;
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}
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if ((*s & 0xF8) == 0xF0) {
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if (len < 4) return 0;
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*c =
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(s[0] & 0x07) << 18 |
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(s[1] & 0x3F) << 12 |
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(s[2] & 0x3F) << 6 |
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(s[3] & 0x3F);
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return 4;
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}
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return 0;
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}
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