Day 8 checkin

+ I didn't like this day

CMakeLists.txt

@@ -3,5 +3,5 @@ project(aoc_2021 C)
 
 set(CMAKE_C_STANDARD 99)
 
-add_executable(aoc_2021 src/main.c src/day_1.c src/day.h src/day_2.c src/puzzle_input.c src/puzzle_input.h src/day_3.c src/day_4.c src/day_5.c src/day_6.c src/day_7.c)
+add_executable(aoc_2021 src/main.c src/day_1.c src/day.h src/day_2.c src/puzzle_input.c src/puzzle_input.h src/day_3.c src/day_4.c src/day_5.c src/day_6.c src/day_7.c src/day_8.c)
 target_link_libraries(aoc_2021 m)

inputs/day_8.txt

@@ -0,0 +1,200 @@
+ecfdbg decfba aegd fdcag fagecd gd gcafb efdac cbgeafd dfg | bgacf afdebc fceda cabfg
+cfdabeg cda bcgad bedfac aefbgd bfgcad dfbga egabc dgfc cd | gdbefac fgabcd dcbefag aedgfb
+aedbfgc gcaf ebgfca bca edgcfb adbge gebac fbegc ac afdcbe | ceafbg acb egbad gfaebc
+gaeb cafdbg aedfc ecfgdb ab cdaefgb cgbdae bdecg cba eacdb | gfacdeb gabdec begcd adbce
+fcbgea fbedg bc cbefg befgcda cfgdab gbc efdgca fecag aceb | faecg cb cb fecbga
+fdebcg bag gdefa ceadgb fcab ebagfc ab fbegc fcaedbg fbeag | cfegb bga edfga fgbec
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+gc cfdbe fgcebd bcgef ceg fdagceb ecadbg fgdc fageb bedcfa | adgcbe aefgdcb gabfe gc
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+cdbgef bgef ge ged badec agfdcb adgecf cgdeb cbgdf fdbceag | dcfgb gcebd egbf dcegb
+dfbea gb cfgea bag fgbc debcga acdbgef afcgbe gfeba cfdaeg | beafd bag cbgf gba
+fdgcab cd ebdaf baecdgf cda bcgaf cfebga acebgd cbdaf cfgd | aegcfb cdgf cdgf afegbdc
+fcbga cbeagf dcabg da dfabcg bdaf begcd dca fdagce bcgfdae | acgbd dbceg acd cfbga
+degacbf cf dcgfba adegbf efgab gfce acfeb dbeca caf gcebaf | bacfe abfecg ebafc debac
+bcaefd gbce dcegfb gcbadf dgfaecb fbdce dgcfe cg agfed fcg | dbgfec gc acdgfb efbcd
+cdfag dgebacf bdfagc fba acdgef fcdab bfdg baedc gbfaec fb | cedbafg fb dgfeac cadbf
+bcdgf eafcbgd bd adfb dcabeg gebfac gcfba gfdacb fdgce bgd | cfbga fgcab db fcegd
+cdgafe deg bedfc dfgb cgdbe dg dcefba efdgbc cagbefd cegab | bgdf abfdec egd gedbfc
+bg febdca edgcb cdeab gbc edgbca gdab beagcf cdegf debacfg | bcaedf dgcef badg fecadbg
+dbca cgaedb gcfbe cea fadbeg gabce ca edcafg degab abfedgc | fdebag beacg abcd adcegb
+gcdfe adbfgec cbafge dgbaf ebf gfbced eb adcgfe becd fgebd | ecgfba gcbfde dbec cdafge
+dbgeafc dacbg badfge abfce ed eda dcfe decba dcfeab gfbeca | febcda defc beacf fdgabe
+efcd bfcadge fcdba egabf bfdcag dcefba deagbc fabed ed edb | gbeacd fdeab ebcfad fageb
+dcgf fegdab bcaeg dcegaf dga gd dcfbea fcdea aedcg bdefgca | cbegdfa eabcfd adfce cbefda
+bf edfbgc cegbf bcadefg ebf acbfde gcedf feadgc gbcae gfbd | feb dfgb egbcdfa dfegc
+efgba eacd efadcg dcgefb gacdf dbcfgae efd bgcdaf edfga ed | cfbgda dgcfa gcfead eadfg
+afgdc fbg cdgaef fagbdc bgcefa cdbf bgdaf bdaeg fb dgabcfe | dagfc cefagb egcabf fcbd
+cadgfe acbed cfabgde fdbcge cfga fad fdeabg fa dcaef dcfge | fad bafgecd cfegad adbfcge
+agdefc cfad bdgecfa gadfe aefgc ad ceadgb gbafce bfedg agd | dag ad fcage cgbafe

src/day.h

@@ -8,5 +8,6 @@ int day_4();
 int day_5();
 int day_6();
 int day_7();
+int day_8();
 
 #endif //AOC_2021_DAY_H

src/day_8.c

@@ -0,0 +1,228 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+
+#include "puzzle_input.h"
+#include "day.h"
+
+#define SIGNAL_PATTERN_DIGITS 10
+#define OUTPUT_DIGITS 4
+#define MAX_ENTRIES 1000
+
+typedef struct {
+    uint8_t signal_patterns[SIGNAL_PATTERN_DIGITS];
+    uint8_t outputs[OUTPUT_DIGITS];
+} display_entry_t;
+
+parse_ret_t parse_display(char * display_str, uint8_t * display_state) {
+    while (*display_str != '\0') {
+        uint8_t bit_to_set;
+        if (*display_str < 'a' || *display_str > 'g') {
+            return PARSER_INVALID;
+        }
+
+        bit_to_set = *display_str - 'a';
+
+        *display_state |= 1 << bit_to_set;
+
+        display_str++;
+    }
+
+    return PARSER_OK;
+}
+
+parse_ret_t parse_display_group(char * display_group_str, uint8_t * display_group, uint16_t display_group_max_len) {
+    char * tok = strtok(display_group_str, " ");
+    uint16_t display_index = 0;
+
+    if (display_group_str == NULL) {
+        return PARSE_NULL;
+    }
+
+    while (tok != NULL) {
+        parse_ret_t ret = parse_display(tok, &display_group[display_index]);
+
+        if (ret != PARSER_OK) {
+            return ret;
+        }
+        tok = strtok(NULL, " ");
+        display_index++;
+
+        if (display_index > display_group_max_len) {
+            return PARSER_RANGE_OVERFLOW;
+        }
+    }
+
+    if (display_index != display_group_max_len) {
+        return PARSER_INVALID;
+    }
+
+    return PARSER_OK;
+}
+
+parse_ret_t parse_display_entry(char * buffer, void * data, uint16_t index) {
+    display_entry_t * display_entries = (display_entry_t *)data;
+    char * signal_patterns = strtok(buffer, "|");
+    char * outputs = strtok(NULL,  "|");
+    display_entry_t * entry = &display_entries[index];
+    parse_ret_t res;
+
+    res = parse_display_group(signal_patterns, entry->signal_patterns, SIGNAL_PATTERN_DIGITS);
+
+    if (res != PARSER_OK) {
+        return res;
+    }
+
+    res = parse_display_group(outputs, entry->outputs, OUTPUT_DIGITS);
+    if (res != PARSER_OK) {
+        return res;
+    }
+
+    return PARSER_OK;
+}
+
+uint8_t count_bits(uint8_t val) {
+    uint8_t on_count = 0;
+    for (int bit_ndx = 0; bit_ndx < 7; bit_ndx++) {
+        if ((val >> bit_ndx) & 0b1) {
+            on_count++;
+        }
+    }
+
+    return on_count;
+}
+
+static void part_1(display_entry_t * entries, uint16_t entry_len) {
+    uint32_t easy_digit_count = 0;
+    for (int entry_ndx = 0; entry_ndx < entry_len; entry_ndx++) {
+        display_entry_t * entry = &entries[entry_ndx];
+        uint32_t count_per_row = 0;
+        for (int disp_ndx = 0; disp_ndx < OUTPUT_DIGITS; disp_ndx++) {
+            uint8_t on_count = count_bits(entry->outputs[disp_ndx]);
+
+            switch (on_count) {
+                case 2: // 1
+                case 4: // 4
+                case 3: // 7
+                case 7: // 8
+                    count_per_row++;
+                default:
+                    break;
+            }
+        }
+
+        easy_digit_count += count_per_row;
+    }
+
+    printf("PART 1: Easy digit count is: %u\n", easy_digit_count);
+}
+
+static uint8_t fix_wire_crossing(uint8_t state, uint8_t crossed_four, uint8_t crossed_7) {
+    uint8_t new_state;
+
+    uint8_t on_count = count_bits(state);
+
+    switch (on_count) {
+        case 2: // 1
+            new_state = 1;
+            break;
+        case 3: // 7
+            new_state = 7;
+            break;
+        case 4: // 4
+            new_state = 4;
+            break;
+        case 5: // 2, 3, 5
+            if ((state & crossed_7) == crossed_7) {
+                new_state = 3;
+            }
+            else if (count_bits(state & crossed_four) == 3) {
+                new_state = 5;
+            }
+            else {
+                new_state = 2;
+            }
+            break;
+        case 6: // 0, 6, 9
+            if ((state & crossed_four) == crossed_four) {
+                new_state = 9;
+            }
+            else if ((state & crossed_7) == crossed_7) {
+                new_state = 0;
+            }
+            else {
+                new_state = 6;
+            }
+            break;
+        case 7: // 8
+            new_state = 8;
+            break;
+        default:
+            break;
+    }
+
+    return new_state;
+}
+
+static void part_2(display_entry_t * entries, uint16_t entry_len) {
+    uint32_t sum = 0;
+    for (int entry_ndx = 0; entry_ndx < entry_len; entry_ndx++) {
+        display_entry_t * entry = &entries[entry_ndx];
+        uint8_t crossed_4 = 0;
+        uint8_t crossed_7 = 0;
+        for (int disp_ndx = 0; disp_ndx < OUTPUT_DIGITS + SIGNAL_PATTERN_DIGITS; disp_ndx++) {
+            uint8_t display_state;
+
+            if (disp_ndx < SIGNAL_PATTERN_DIGITS) {
+                display_state = entry->signal_patterns[disp_ndx];
+            }
+            else {
+                display_state = entry->outputs[disp_ndx-OUTPUT_DIGITS];
+            }
+
+            uint8_t bit_count = count_bits(display_state);
+            if (bit_count == 4) {
+                crossed_4 = display_state;
+            }
+            else if (bit_count == 3) {
+                crossed_7 = display_state;
+            }
+        }
+
+        if (crossed_7 == 0 || crossed_4 == 0) {
+            printf("oopsie woopise, a lil fucky wucky\n");
+            return;
+        }
+
+        for (int disp_ndx = 0; disp_ndx < OUTPUT_DIGITS; disp_ndx++) {
+            uint8_t display_state = entry->outputs[disp_ndx];
+            uint8_t val = fix_wire_crossing(display_state, crossed_4, crossed_7);
+            sum += (val * (int32_t)pow(10, (OUTPUT_DIGITS-disp_ndx-1)));
+        }
+
+    }
+
+    printf("PART 2: Output sum: %d\n", sum);
+}
+
+
+display_entry_t entries_g[MAX_ENTRIES] = {0};
+
+int day_8() {
+    parse_ret_t res;
+    uint16_t display_len;
+
+    res = read_input_single_line("../inputs/day_8.txt", (void *)entries_g, MAX_ENTRIES, parse_display_entry, &display_len);
+
+    if (res != PARSER_OK) {
+        printf("Unable to parse input: %d\n", res);
+        return -1;
+    }
+
+    part_1(entries_g, display_len);
+    part_2(entries_g, display_len);
+
+
+    return 0;
+}

src/main.c

@@ -37,6 +37,9 @@ int main(int argc, char * argv[]) {
         case 7:
             day_7();
             break;
+        case 8:
+            day_8();
+            break;
         default:
             printf("Invalid day ding dong!\n");
             return -2;