feat: Day4_1 read input

2024/Day4/src/main.c

@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int get_line_length(const char *filename);
+int get_rows(const char *filename);
+char *get_char(char *word_search, int row, int col);
+void init_word_search(char *word_search, const char *filename);
+void print_field(char *word_search);
+
+int ROWS;
+int COLS;
+
+int main(void) {
+    const char filename[] = "input.txt";
+    COLS = get_line_length(filename);
+    ROWS = get_rows(filename);
+    char *word_search = malloc(ROWS * COLS * sizeof(char));
+
+    init_word_search(word_search, filename);
+    print_field(word_search);
+
+    return 0;
+}
+
+int get_line_length(const char *filename) {
+    int length = 0;
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        perror("Opening file failed");
+        exit(1);
+    }
+    char c;
+
+    while ((c = fgetc(file)) != '\n') {
+        length++;
+    }
+
+    fclose(file);
+    return length;
+}
+
+int get_rows(const char *filename) {
+    int rows = 0;
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        perror("Opening file failed");
+        exit(1);
+    }
+    char c;
+
+    while ((c = fgetc(file)) != EOF) {
+        if (c == '\n') {
+            rows++;
+        }
+    }
+
+    fclose(file);
+    return rows;
+}
+
+char *get_char(char *word_search, int row, int col) { return &word_search[row * ROWS + col]; }
+
+void print_field(char *word_search) {
+    for (int row = 0; row < ROWS; row++) {
+        for (int col = 0; col < COLS; col++) {
+            printf("[%c]", *get_char(word_search, row, col));
+        }
+        printf("\n");
+    }
+}
+
+void init_word_search(char *word_search, const char *filename) {
+    char buffer[COLS];
+    int current_row = 0;
+    FILE *file = fopen(filename, "r");
+    if (file == NULL) {
+        perror("Opening file failed");
+        exit(1);
+    }
+
+    while (fgets(buffer, COLS+2, file)) {
+        for (int i = 0; i < COLS; i++) {
+            if (buffer[i] != '\n' && buffer[i] != '\0' && buffer[i] != '\r') {
+                *get_char(word_search, current_row, i) = buffer[i];
+            }
+        }
+        current_row++;
+    }
+}