Modularisation

src/calibration.c

@@ -1,23 +1,9 @@
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 
-static char *strrev(char *to_reverse) {
-    size_t length = strlen(to_reverse);
-    int position = length - 1;
-    char *reversed = malloc((1 + length) * sizeof(char));
-
-    while (position >= 0) {
-        *reversed = to_reverse[position];
-        reversed++;
-        position--;
-    }
-    *reversed = '\0';
-    reversed = reversed - length;
-
-    return reversed;
-}
+#include "string.h"
+#include "io.h"
 
 static char first_digit(char *line) {
     while (*line != '\0' && !isdigit(*line)) {
@@ -31,31 +17,6 @@ static char first_digit(char *line) {
     }
 }
 
-static char *read_line(FILE *input_file) {
-    unsigned int max_length = 16;
-    unsigned int current_length = 0;
-    char *line = malloc(max_length * sizeof(char));
-    int current_char = fgetc(input_file);
-
-    while (current_char != EOF && current_char != '\n') {
-        if (current_length == max_length) {
-            max_length *= 2;
-            line = realloc(line, max_length * sizeof(char));
-        }
-
-        line[current_length] = current_char;
-        current_length++;
-        current_char = fgetc(input_file);
-    }
-
-    if (current_length == max_length) {
-        line = realloc(line, (max_length + 1) * sizeof(char));
-    }
-    line[current_length] = '\0';
-
-    return line;
-}
-
 unsigned int get_calibration_sum(FILE *input_file) {
     unsigned int sum = 0;
     char *current_line, *reversed_line;

src/calibration.h

@@ -1,6 +1,8 @@
 #ifndef CALIBRATION_H
 #define CALIBRATION_H
 
+#include <stdio.h>
+
 unsigned int get_calibration_sum(FILE *input_file);
 
 #endif /* CALIBRATION_H */

src/io.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+char *read_line(FILE *input_file) {
+    unsigned int max_length = 16;
+    unsigned int current_length = 0;
+    char *line = malloc(max_length * sizeof(char));
+    int current_char = fgetc(input_file);
+
+    while (current_char != EOF && current_char != '\n') {
+        if (current_length == max_length) {
+            max_length *= 2;
+            line = realloc(line, max_length * sizeof(char));
+        }
+
+        line[current_length] = current_char;
+        current_length++;
+        current_char = fgetc(input_file);
+    }
+
+    if (current_length == max_length) {
+        line = realloc(line, (max_length + 1) * sizeof(char));
+    }
+    line[current_length] = '\0';
+
+    return line;
+}

src/io.h

@@ -0,0 +1,8 @@
+#ifndef IO_H
+#define IO_H
+
+#include <stdio.h>
+
+char *read_line(FILE *input_file);
+
+#endif /* IO_H */

src/string.c

@@ -0,0 +1,18 @@
+#include <stdlib.h>
+#include <string.h>
+
+char *strrev(char *to_reverse) {
+    size_t length = strlen(to_reverse);
+    int position = length - 1;
+    char *reversed = malloc((1 + length) * sizeof(char));
+
+    while (position >= 0) {
+        *reversed = to_reverse[position];
+        reversed++;
+        position--;
+    }
+    *reversed = '\0';
+    reversed = reversed - length;
+
+    return reversed;
+}

src/string.h

@@ -0,0 +1,6 @@
+#ifndef STRING_H
+#define STRING_H
+
+char *strrev(char *to_reverse);
+
+#endif /* STRING_H */