42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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int main(int argc, char **argv) {
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FILE *input;
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char *line = NULL;
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size_t line_length = 0;
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if (argc == 1 || argv[1][0] == '-')
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input = stdin;
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else if ((input = fopen(argv[1], "r")) == NULL) {
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printf("Cannot open file %s\n", argv[1]);
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return -1;
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}
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int32_t calibration_value = 0;
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while (getline(&line, &line_length, input) != -1) {
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int32_t current_calibration_value = -1;
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int8_t last_digit = 0;
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for (size_t i = 0; i < line_length-1; ++i) {
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if (line[i]>>4 == 0x3) {
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if (current_calibration_value == -1)
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current_calibration_value = (line[i]&0xf) * 10;
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last_digit = line[i]&0xf;
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}
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}
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if (current_calibration_value != -1)
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calibration_value += current_calibration_value + last_digit;
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memset(line, 0, line_length);
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}
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printf("%d\n", calibration_value);
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return 0;
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} |