change get_binary to unsigned char

docs/input.md

@@ -25,7 +25,7 @@ Reads a file at `path` and returns the contents as a single string. The string i
 the user is responsible for freeing it when finished.
 
 ```c
-char *get_input(const char *path);
+unsigned char *get_input(const char *path);
 
 /* Usage */
 char *str = get_input("/home/evan/textfile");

include/lfinput.h

@@ -3,7 +3,7 @@
 
 #include <stdlib.h>
 
-char *get_binary(const char *, size_t *fsz);
+unsigned char *get_binary(const char *, size_t *fsz);
 
 char *get_input(const char *);
 

src/input.c

@@ -26,14 +26,14 @@ static FILE* open_file(const char *path, size_t *fsz) {
     return fp;
 }
 
-char *get_binary(const char *path, size_t *fsz) {
+unsigned char *get_binary(const char *path, size_t *fsz) {
     FILE *fp = open_file(path, fsz);
     if (fp == NULL) {
         return NULL;
     }
 
-    char *buf = NULL;
+    unsigned char *buf = NULL;
-    buf = malloc(*fsz);
+    buf = (unsigned char*)malloc(sizeof(unsigned char) * (*fsz));
     if (buf == NULL) {
         fprintf(stderr, "Failed to malloc buf. Returning NULL\n");
         fclose(fp);