Some minor tweaks

sh.c

@@ -1,3 +1,5 @@
+#define _POSIX_C_SOURCE 200809L
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -6,19 +8,6 @@
 #include <signal.h>
 #include <libgen.h>
 #include <errno.h>
-
-/*
-  Gods damn it, of course we have to have special shit
-  just for the fucking GNU Project. Fuckers can't let
-  anything be done to standard unless they fucking want
-  to or you beg them to let you, can they?
-
-  -Kat
-*/
-#ifdef __GLIBC__
-#define __USE_POSIX
-#define __USE_POSIX2
-#endif
 #include <limits.h>
 
 #define ARG_SEP " " /* Argument separator for commands */
@@ -30,26 +19,26 @@ char* prompt();
 int cd(char* path);
 
 int main() {
-  char** argv; /* The command with arguments */
+  char** argv;
   char* user_input;
   pid_t child_pid;
   int stat_loc; /* ??? (Needed for waitpid) */
 
-  signal(SIGINT, SIG_IGN); /* Tell vsh to ignore SIGINT (^C) */
+  signal(SIGINT, SIG_IGN);
 
   while(1) {
     user_input = prompt();
     argv = create_argv(user_input);
 
     if(strcmp(argv[0], "cd") == 0) {
-      if(cd(&user_input[3]) < 0) {
-	perror(argv[1]);
+      if(cd(argv[1]) < 0) {
+        perror(argv[1]);
       }
       /* causes the fork to get skipped */
       continue;
     }
     else if(strcmp(argv[0], "exit") == 0 ||
-	    strcmp(argv[0], "quit") == 0) {
+      strcmp(argv[0], "quit") == 0) {
       exit(0);
     }
 
@@ -57,25 +46,25 @@ int main() {
     if(child_pid < 0) {
       /* Could not start child process. Check why and error out. */
       if(errno == EAGAIN) {
-	perror("Could not execute command: insufficient resources");
-	exit(1);
+        perror("Could not execute command: insufficient resources");
+        exit(1);
       }
       else if(errno == ENOMEM) {
-	/* Is this out of RAM or out of storage? */
-	perror("Could not execute command: insufficient storage space");
-	exit(1);
+        /* Is this out of RAM or out of storage? */
+        perror("Could not execute command: insufficient storage space");
+        exit(1);
       }
       else {
-	perror("Could not execute command: unknown failure");
-	exit(1);
+        perror("Could not execute command: unknown failure");
+        exit(1);
       }
     }
     else if(child_pid == 0) {
       /* We are the child, so allow ^C */
       signal(SIGINT, SIG_DFL);
       if(execvp(argv[0], argv) < 0) {
-	perror(argv[0]);
-	exit(1);
+        perror(argv[0]);
+        exit(1);
       }
     }
     else {