From 4f670845ff9ab6c48bcb5f7bf4d4ef6dc3c3064b Mon Sep 17 00:00:00 2001
From: manuel <manuel@mausz.at>
Date: Tue, 27 Mar 2012 11:51:08 +0200
Subject: reorganize file structure to match the upstream requirements

---
 pintos-progos/examples/pwd.c | 152 -------------------------------------------
 1 file changed, 152 deletions(-)
 delete mode 100644 pintos-progos/examples/pwd.c

(limited to 'pintos-progos/examples/pwd.c')

diff --git a/pintos-progos/examples/pwd.c b/pintos-progos/examples/pwd.c
deleted file mode 100644
index d2305cf..0000000
--- a/pintos-progos/examples/pwd.c
+++ /dev/null
@@ -1,152 +0,0 @@
-/* pwd.c
-   
-   Prints the absolute name of the present working directory. */
-
-#include <syscall.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
-
-static bool getcwd (char *cwd, size_t cwd_size);
-
-int
-main (void) 
-{
-  char cwd[128];
-  if (getcwd (cwd, sizeof cwd)) 
-    {
-      printf ("%s\n", cwd);
-      return EXIT_SUCCESS;
-    }
-  else 
-    {
-      printf ("error\n");
-      return EXIT_FAILURE; 
-    }
-}
-
-/* Stores the inode number for FILE_NAME in *INUM.
-   Returns true if successful, false if the file could not be
-   opened. */
-static bool
-get_inumber (const char *file_name, int *inum) 
-{
-  int fd = open (file_name);
-  if (fd >= 0) 
-    {
-      *inum = inumber (fd);
-      close (fd);
-      return true;
-    }
-  else
-    return false;
-}
-
-/* Prepends PREFIX to the characters stored in the final *DST_LEN
-   bytes of the DST_SIZE-byte buffer that starts at DST.
-   Returns true if successful, false if adding that many
-   characters, plus a null terminator, would overflow the buffer.
-   (No null terminator is actually added or depended upon, but
-   its space is accounted for.) */
-static bool
-prepend (const char *prefix,
-         char *dst, size_t *dst_len, size_t dst_size) 
-{
-  size_t prefix_len = strlen (prefix);
-  if (prefix_len + *dst_len + 1 <= dst_size) 
-    {
-      *dst_len += prefix_len;
-      memcpy ((dst + dst_size) - *dst_len, prefix, prefix_len);
-      return true;
-    }
-  else
-    return false;
-}
-
-/* Stores the current working directory, as a null-terminated
-   string, in the CWD_SIZE bytes in CWD.
-   Returns true if successful, false on error.  Errors include
-   system errors, directory trees deeper than MAX_LEVEL levels,
-   and insufficient space in CWD. */
-static bool
-getcwd (char *cwd, size_t cwd_size) 
-{
-  size_t cwd_len = 0;   
-  
-#define MAX_LEVEL 20
-  char name[MAX_LEVEL * 3 + 1 + READDIR_MAX_LEN + 1];
-  char *namep;
-
-  int child_inum;
-
-  /* Make sure there's enough space for at least "/". */
-  if (cwd_size < 2)
-    return false;
-
-  /* Get inumber for current directory. */
-  if (!get_inumber (".", &child_inum))
-    return false;
-
-  namep = name;
-  for (;;)
-    {
-      int parent_inum, parent_fd;
-
-      /* Compose "../../../..", etc., in NAME. */
-      if ((namep - name) > MAX_LEVEL * 3)
-        return false;
-      *namep++ = '.';
-      *namep++ = '.';
-      *namep = '\0';
-
-      /* Open directory. */
-      parent_fd = open (name);
-      if (parent_fd < 0)
-        return false;
-      *namep++ = '/';
-
-      /* If parent and child have the same inumber,
-         then we've arrived at the root. */
-      parent_inum = inumber (parent_fd);
-      if (parent_inum == child_inum)
-        break;
-
-      /* Find name of file in parent directory with the child's
-         inumber. */
-      for (;;)
-        {
-          int test_inum;
-          if (!readdir (parent_fd, namep) || !get_inumber (name, &test_inum)) 
-            {
-              close (parent_fd);
-              return false; 
-            }
-          if (test_inum == child_inum)
-            break;
-        }
-      close (parent_fd);
-
-      /* Prepend "/name" to CWD. */
-      if (!prepend (namep - 1, cwd, &cwd_len, cwd_size))
-        return false;
-
-      /* Move up. */
-      child_inum = parent_inum;
-    }
-
-  /* Finalize CWD. */
-  if (cwd_len > 0) 
-    {
-      /* Move the string to the beginning of CWD,
-         and null-terminate it. */
-      memmove (cwd, (cwd + cwd_size) - cwd_len, cwd_len);
-      cwd[cwd_len] = '\0';
-    }
-  else 
-    {
-      /* Special case for the root. */
-      strlcpy (cwd, "/", cwd_size); 
-    }
-  
-  return true;
-}
-- 
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