chore: some cleanup

day_1.c

@@ -3,51 +3,81 @@
 //
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
 
-#define ARRAY_LIST_IMPLEMENTATION
-#include "array_list.h"
+int read_line(FILE *f, bool replace_letters);
+int solve(const char *fileName, bool replace_letters);
 
-int read_line(FILE *f);
+char *buffer;
+int bufferLen = 64;
+const char* digitsAsLetters[] = {
+    "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"
+};
 
 int main() {
-    FILE *f = fopen("day_1.txt", "r");
+    buffer = malloc(bufferLen * sizeof (char));
+
+    printf("Result #1: %i\n", solve("day_1.txt", false));
+    printf("Result #2: %i\n", solve("day_1.txt", true));
+
+    free(buffer);
+    return 0;
+}
+
+int solve(const char *fileName, bool replace_letters) {
+    FILE *f = fopen(fileName, "r");
     if(f == NULL) {
         printf("Error! Missing input file!");
-        return -1;
+        exit(-1);
     }
 
     int sum = 0;
     while(!feof(f)) {
-        sum += read_line(f);
+        sum += read_line(f, replace_letters);
     }
-
     fclose(f);
-    printf("Result: %i\n", sum);
-    return 0;
+    return sum;
 }
 
 // Read all digits form the next line in a file
-int read_line(FILE *f) {
+int read_line(FILE *f, bool replace_letters) {
     int first = -1, last = 10; // Use first=-1 to detect unset value and last=10 to return 0 (-10 + 10) when no values are set
-    char buffer[16];
-    int digit;
+
+    // Read the entire line as a string
+    int position = 0;
     do {
-        fgets(&buffer[0], 16, f);
-        for(int i = 0; i < 16; i++) {
-            if(buffer[i] == '\n') {
-                goto result;
-            } else if(buffer[i] == 0) {
-                break; // End of buffer
-            }
-            if(sscanf(&buffer[i], "%1d", &digit) == 1) { // NOLINT(*-err34-c)
-                if(first == -1) {
-                    first = digit;
+        if(position >= bufferLen - 1) {
+            buffer = realloc(buffer, 2 * sizeof(char) * bufferLen);
+            bufferLen *= 2;
+        }
+        fgets(&buffer[position], bufferLen - position, f);
+        position = bufferLen - 1;
+    } while(buffer[strlen(buffer) - 1] != '\n' && !feof(f));
+
+    for(int i = 0; i < bufferLen; i++) {
+        if(buffer[i] == 0) {
+            break;
+        }
+
+        int digit = -1;
+        if(sscanf(&buffer[i], "%1d", &digit) != 1 && replace_letters) {
+            for(int j = 1; j < 10; j++) {
+                if(strncmp(&buffer[i], digitsAsLetters[j], strlen(digitsAsLetters[j])) == 0) {
+                    digit = j;
+                    break;
                 }
-                last = digit;
             }
         }
-    } while(!feof(f));
 
-    result:
+        if(digit >= 0) {
+            if(first == -1) {
+                first = digit;
+            }
+            last = digit;
+        }
+    }
+
     return first * 10 + last;
 }