day 10

1 files changed, 86 insertions, 0 deletions

diff --git a/Advent-of-Code-2022/aoc-10/main.c b/Advent-of-Code-2022/aoc-10/main.c
new file mode 100644
index 0000000..526d5d0
--- /dev/null
+++ b/Advent-of-Code-2022/aoc-10/main.c
@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#if 0
+  #define PART part1
+#else
+  #define PART part2
+#endif
+
+#if 0
+  #define FILENAME "sample.txt"
+#else
+  #define FILENAME "input.txt"
+#endif
+
+#define CMDS 2
+char commands[CMDS][5] = {"noop", "addx"};
+char cmdcycles[CMDS]   = {1, 2};
+
+int x = 1;
+int cycles = 0;
+int sum = 0;
+
+void part1()
+{
+    cycles++;
+
+    if((cycles+20) % 40 == 0) sum += cycles * x;
+}
+
+void part2()
+{
+    int i = cycles % 40;
+    printf("%c", (x == i || x == i+1 || x == i-1) ? '#' : '.');
+    if(i == 39) printf("\n");
+
+    cycles++;
+}
+
+int parse_cmd(char *cmdstr)
+{
+    for(int i = 0; i < CMDS; i++)
+        if(strncmp(commands[i], cmdstr, 4) == 0) return i;
+    return -1;
+}
+
+void parse()
+{
+    FILE *fp = fopen(FILENAME, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file: %s\n", FILENAME);
+        exit(1);
+    }
+
+    char line[256];
+    while(fgets(line, sizeof(line), fp))
+    {
+        int cmd = parse_cmd(strtok(line, " "));
+        assert(cmd >= 0);
+
+        for(int i = 0; i < cmdcycles[cmd]; i++)
+        {
+            PART();
+
+            switch(cmd) {
+            case 0:
+                break;
+            case 1:
+                if(i == 1) x += atoi(strtok(NULL, " "));
+                break;
+            }
+
+        }
+    }
+
+    fclose(fp);
+}
+
+int main(void)
+{
+    parse();
+    printf("%d\n", sum);
+    return 0;
+}