Convert file descriptors to generic streams

src/user/app/cat/cat.c

@@ -1,3 +1,4 @@
+#include "src/lib/util.h"
 #include "src/user/syscall.h"
 
 #define BLOCK_SIZE 65536
@@ -5,12 +6,12 @@
 #define PRINT_S(s) write(1, s, sizeof(s) - 1);
 #define PRINT_D(s) write(1, s, string_length(s));
 
-uint64_t cat(const char *path) {
+exit_code_t cat(const char *path) {
   uint64_t fd = open(path);
 
   if (fd == (uint64_t)-1) {
     PRINT_S("cat: path does not exist\n");
-    return (uint64_t)-1;
+    return EXIT_CODE_GENERAL_FAILURE;
   }
 
   static char buffer[BLOCK_SIZE];
@@ -19,7 +20,7 @@ uint64_t cat(const char *path) {
     if (bytes == (uint64_t)-1) {
       PRINT_S("cat: could not read file\n");
       close(fd);
-      return (uint64_t)-1;
+      return EXIT_CODE_GENERAL_FAILURE;
     }
     write(1, buffer, bytes);
   }
@@ -29,15 +30,16 @@ uint64_t cat(const char *path) {
   return 0;
 }
 
-uint64_t main(uint64_t argc, const char **argv) {
+exit_code_t main(uint64_t argc, const char **argv) {
   if (argc == 1) {
     return cat(".");
   }
 
-  uint64_t code = 0;
+  uint64_t code = EXIT_CODE_OK;
   for (uint64_t i = 1; i < argc; i++) {
-    if (cat(argv[i]) == (uint64_t)-1) {
-      code = (uint64_t)-1;
+    exit_code_t c = cat(argv[i]);
+    if (c != EXIT_CODE_OK) {
+      code = c;
     }
   }