basic repl loop working

error.h

@@ -5,7 +5,8 @@
 enum ExitCodes {
     ER_SUCCESS,
     ER_FAILURE,
-    ER_FAIL_TO_FORK
+    ER_FAIL_TO_FORK,
+    ER_ALLOC
 };
 
 #endif

main.c

@@ -1,43 +1,106 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdbool.h>
-
 #include "error.h"
+#include "run.h"
 
 #define INITIALLINEBUFFER 80
+#define INITIAL_WORD_SIZE 80
 
-char *readline(FILE* in) {
+int readline(FILE* in, char **out) {
     int size_of_buffer = INITIALLINEBUFFER;
     char *buffer = calloc(size_of_buffer, sizeof(char));
-
     char character;
-    int count;
+    int count = 0;
 
     while (true) {
 
-        if (count == (size_of_buffer)) {
-            buffer = reallocarray(buffer, (size_of_buffer *= 2),  sizeof(char));
-
-            if (!buffer) {
-                return 0;
-            }
-        }
-
         character = fgetc(in);        
-        if (character == EOF || character == '\n') {
+        if (character == EOF) {
+            buffer[count] = '\0';
+            *out = buffer;
+            return EOF;
+        }
+        if (character == '\n') {
             buffer[count] = '\0';
-            return buffer;
+            *out = buffer;
+            return ER_SUCCESS;
         } else {
+            if (count == (size_of_buffer - 3)) {
+                buffer = reallocarray(buffer, (size_of_buffer *= 2),  
+                        sizeof(char));
+
+                if (!buffer) {
+                    return ER_ALLOC;
+                }
+            }
+
             buffer[count] = character;
+            count++;
         }
     }
+}
+
+int split_string(char **sep_string[], int *num, char *string, char delim) {
+    char **word_list = calloc(10, sizeof(char*));
+    int word_size;
+
+    char *word = calloc((word_size=INITIAL_WORD_SIZE), sizeof(char));
+    int num_words = 0;
+    int word_length = 0;
 
+    for (int i = 0; true; i++) {
+        if (string[i] == '\0') {
+            if (word_length) {
+                word_list[num_words] = word;
+                num_words++;
+            }
+
+            *sep_string = word_list;
+            *num = num_words;
+            return ER_SUCCESS;
+        }
+
+        if (string[i] == delim) {
+            if (word_length) {
+                word_list[num_words] = word;
+
+                num_words++;
+                word_length = 0;
+                word = calloc((word_size=INITIAL_WORD_SIZE), sizeof(char));
+            }
+        } else {
+            word[word_length] = string[i];
+            word_length++;
 
+            if (word_length == word_size - 2) {
+                word = reallocarray(word, word_size *= 2, sizeof(char));
+            }
+        } 
+    }
+
+    return ER_FAILURE;
 }
 
 int repl(void) {
     while (true) {
+        char *line;
+        printf("$ ");
+        if (readline(stdin, &line)) {
+            return ER_SUCCESS;
+        }
 
+        char **sep_string;
+        int num_words;
+
+        split_string(&sep_string, &num_words, line, ' ');
+        execute(stdin, stdout, sep_string);
+
+        for (int i = 0; i < num_words; i++) {
+            free(sep_string[i]);
+        }
+        free(sep_string);
+        free(line);
     }
 }