Open file + make buffer

include/lib.h

@@ -1,4 +1,6 @@
 #ifndef LIB_H
 #define LIB_H
 void die(const char *message);
+
+char* formatBytes(double *bytes);
 #endif

src/lib.c

@@ -1,7 +1,26 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/ioctl.h>
 
 void die(const char *message) {
   perror(message);
   exit(1);
 }
+
+char *formatBytes(double *bytes) {
+  char *SIZES[] = {"bytes", "kB", "MB", "GB"};
+
+  size_t size = *bytes;
+  size_t div = 0;
+  size_t rem = 0;
+
+  while (size >= 1024 && div < (sizeof SIZES / sizeof *SIZES)) {
+    rem = (size % 1024);
+    div++;
+    size /= 1024;
+  }
+
+  *bytes = (float)size + (float)rem / 1024.0;
+
+  return SIZES[div];
+}

src/main.c

@@ -3,18 +3,55 @@
 
 #include "lib.h"
 
+#define INVERT_T "\x1b[7m"
+#define UINVERT_T "\x1b[27m"
+
 int main(int argc, char *argv[]) {
   if (argc < 2) {
     printf("usage: catclone <FILE>\n");
     die("args");
   }
 
-  FILE *fp = fopen(argv[1], "r");
+  FILE *fp = fopen(argv[1], "r+b");
 
-  if (fp == NULL) {
+  if (fp == NULL)
     die("fopen");
+
+  printf("%s%s%s\r\n", INVERT_T, argv[1], UINVERT_T);
+
+  int bufsize = 4;
+  char *buf;
+
+  buf = malloc(bufsize);
+  if (buf == NULL)
+    die("malloc");
+
+  double fsize = 0;
+  int offset = 0;
+  char c;
+  while (fread(&c, sizeof(char), 1, fp) > 0) {
+    if (fsize == bufsize - 1) {
+      bufsize *= 2;
+
+      char *new_buf = realloc(buf, bufsize);
+      if (buf == NULL) {
+        free(buf);
+        die("realloc");
       }
 
+      buf = new_buf;
+    }
+
+    buf[offset++] = c;
+    fsize++;
+  }
+
+  printf("\r\n");
+
+  char *format = formatBytes(&fsize);
+
+  printf("%s%.2f %s%s\r\n", INVERT_T, fsize, format, UINVERT_T);
+
   fclose(fp);
 
   return 0;