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#include "qrcode-util.h"
#include "terminal-util.h"
#define ANSI_WHITE_ON_BLACK "\033[40;37;1m"
static void print_border(FILE *output, unsigned width) {
/* Four rows of border */
for (unsigned y = 0; y < 4; y += 2) {
fputs(ANSI_WHITE_ON_BLACK, output);
for (unsigned x = 0; x < 4 + width + 4; x++)
fputs("\342\226\210", output);
fputs(ANSI_NORMAL "\n", output);
}
}
void write_qrcode(FILE *output, QRcode *qr) {
assert(qr);
if (!output)
output = stdout;
print_border(output, qr->width);
for (unsigned y = 0; y < (unsigned) qr->width; y += 2) {
const uint8_t *row1 = qr->data + qr->width * y;
const uint8_t *row2 = row1 + qr->width;
fputs(ANSI_WHITE_ON_BLACK, output);
for (unsigned x = 0; x < 4; x++)
fputs("\342\226\210", output);
for (unsigned x = 0; x < (unsigned) qr->width; x++) {
bool a, b;
a = row1[x] & 1;
b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
if (a && b)
fputc(' ', output);
else if (a)
fputs("\342\226\204", output);
else if (b)
fputs("\342\226\200", output);
else
fputs("\342\226\210", output);
}
for (unsigned x = 0; x < 4; x++)
fputs("\342\226\210", output);
fputs(ANSI_NORMAL "\n", output);
}
print_border(output, qr->width);
fflush(output);
}
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