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- ```c
- int rgb2xterm(uint32_t rgb) {
- const int b = rgb & 0377;
- const int g = (rgb >> 8) & 0377;
- const int r = (rgb >> 16) & 0377;
- int r6 = r / 51;
- int g6 = g / 51;
- int b6 = b / 51;
- return 16 + r6 * 6*6 + g6 * 6 + b6;
- }
- ```
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