95 lines
1.7 KiB
C
95 lines
1.7 KiB
C
#define _POSIX_C_SOURCE 200809L
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdint.h>
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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 <sys/types.h>
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enum command {
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UNK = 0,
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FORWARD,
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DOWN,
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UP,
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};
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struct act {
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enum command cmd;
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uintmax_t cnt;
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};
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static int
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carray (FILE *f, struct act *res) {
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char * str = NULL;
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size_t bs = 0;
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ssize_t b = getline (&str, &bs, f);
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if (b == -1) {
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fprintf (stderr, "getline returned a error\n");
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return 1;
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}
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char *act = strtok (str, " "),
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*cnt = strtok (NULL, "\n");
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if (act == NULL) {
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fprintf (stderr, "Action is empty.\n");
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return 1;
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}
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if (strcmp (act, "forward") == 0) {
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res->cmd = FORWARD;
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} else if (strcmp (act, "down") == 0) {
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res->cmd = DOWN;
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} else if (strcmp (act, "up") == 0) {
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res->cmd = UP;
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} else {
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fprintf (stderr, "Line couldn't be parsed.\n");
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return 2;
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}
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res->cnt = strtoumax (cnt, NULL, 10);
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return 0;
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}
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int
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main (void) {
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struct {
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uintmax_t depth, pos, aim;
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} axis = {
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.depth = 0,
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.pos = 0,
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.aim = 0,
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};
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struct act cur = {0};
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while (carray (stdin, &cur) == 0) {
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switch (cur.cmd) {
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case FORWARD:
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fprintf (stderr, "Added %zu to pos\n", cur.cnt);
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axis.pos += cur.cnt;
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axis.depth += axis.aim * cur.cnt;
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break;
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case DOWN:
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fprintf (stderr, "Added %zu to depth\n", cur.cnt);
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axis.aim += cur.cnt;
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break;
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case UP:
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fprintf (stderr, "Subtracted %zu from depth\n", cur.cnt);
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axis.aim -= cur.cnt;
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break;
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default: {
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fprintf (stderr, "Invalid action was parsed.\n");
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return 1;
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}
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}
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}
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printf ("D: %zu\n"
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"P: %zu\n"
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"C: %zu\n",
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axis.depth,
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axis.pos,
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axis.pos * axis.depth);
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return 0;
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}
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