- change uname -o to "PLD Linux"

[packages/coreutils.git] / coreutils-install-C.patch

diff -Nur coreutils-4.5.3.orig/doc/coreutils.texi coreutils-4.5.3/doc/coreutils.texi
--- coreutils-4.5.3.orig/doc/coreutils.texi	Sun Oct 27 22:19:34 2002
+++ coreutils-4.5.3/doc/coreutils.texi	Sun Oct 27 22:48:17 2002
@@ -6188,6 +6188,11 @@
 @xref{Backup options}.
 Make a backup of each file that would otherwise be overwritten or removed.
 
+@item -C
+@opindex -C
+Install file, unless target already exists and is the same file, in which
+case the modification time is not changed.
+
 @item -c
 @opindex -c
 Ignored; for compatibility with old Unix versions of @command{install}.
diff -Nur coreutils-4.5.3.orig/src/install.c coreutils-4.5.3/src/install.c
--- coreutils-4.5.3.orig/src/install.c	Thu Sep 26 10:39:20 2002
+++ coreutils-4.5.3/src/install.c	Sun Oct 27 22:48:17 2002
@@ -25,6 +25,7 @@
 #include <stdio.h>
 #include <getopt.h>
 #include <sys/types.h>
+#include <sys/mman.h>
 #include <pwd.h>
 #include <grp.h>
 
@@ -113,6 +114,9 @@
    no effect. */
 static mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
 
+/* Compare files before installing (-C) */
+static int docompare=0;
+
 /* If nonzero, strip executable files after copying them. */
 static int strip_files;
 
@@ -136,6 +140,82 @@
   {NULL, 0, NULL, 0}
 };
 
+int compare (const char *file, const char *to)
+{
+  void *p, *q;
+  int ret=0;
+  size_t size;
+  int done=0;
+  struct stat file_s, to_s;
+  int file_fd, to_fd;
+  
+  stat(file, &file_s);
+  stat(to, &to_s);
+  
+  if (file_s.st_size != to_s.st_size)
+    return 1;
+
+  file_fd = open(file, O_RDONLY);
+  if (file_fd < 0)
+    return 1;
+  
+  to_fd = open(to, O_RDONLY);
+  if (to_fd < 0)
+    {
+      close(file_fd);
+      return 1;
+    }
+      
+  size = (size_t) file_s.st_size;
+  if (size <= 4194309) /* Don't try to mmap() files > 4 MB */
+    {
+      p = mmap(NULL, size, PROT_READ, MAP_SHARED, file_fd, (off_t) 0);
+      if (p != MAP_FAILED)
+	{
+          q = mmap(NULL, size, PROT_READ, MAP_SHARED, to_fd, (off_t) 0);
+          if (q == MAP_FAILED)
+            {
+              munmap(p, size);
+            }
+	  else
+            {
+              ret = (memcmp(p, q, size)==0) ? 0 : 1;
+              munmap(p, size);
+              munmap(q, size);
+              done = 1;
+            }
+       }
+    }
+  if (!done)
+    {
+      char buf1[65536], buf2[65536];
+      int n1, n2;
+
+      lseek(file_fd, 0, SEEK_SET);
+      lseek(to_fd, 0, SEEK_SET);
+      while (ret == 0)
+        {
+          n1 = read(file_fd, buf1, sizeof(buf1));
+          if (n1 == 0)
+            break;
+          else if (n1 > 0)
+            {
+              n2 = read(to_fd, buf2, n1);
+              if (n2 == n1)
+                ret = memcmp(buf1, buf2, n1);
+              else
+                ret = 1; /* ouf of sync */
+            }
+          else
+            ret = 1; /* read failure */
+        }
+    }
+
+  close(file_fd);
+  close(to_fd);
+  return ret;
+}
+
 static void
 cp_option_init (struct cp_options *x)
 {
@@ -206,7 +286,7 @@
      we'll actually use backup_suffix_string.  */
   backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
 
-  while ((optc = getopt_long (argc, argv, "bcsDdg:m:o:pvV:S:", long_options,
+  while ((optc = getopt_long (argc, argv, "bcCsDdg:m:o:pvV:S:", long_options,
 			      NULL)) != -1)
     {
       switch (optc)
@@ -228,6 +308,9 @@
 	  break;
 	case 'c':
 	  break;
+	case 'C':
+	  docompare=1;
+	  break;
 	case 's':
 	  strip_files = 1;
 	  break;
@@ -436,6 +519,12 @@
       return 1;
     }
 
+  if (docompare)
+    {
+      if(compare(from, to)==0) /* Files are identical */
+	return 0;
+    }
+  
   fail = copy (from, to, nonexistent_dst, x, &copy_into_self, NULL);
 
   return fail;
@@ -613,6 +702,9 @@
       --backup[=CONTROL] make a backup of each existing destination file\n\
   -b                  like --backup but does not accept an argument\n\
   -c                  (ignored)\n\
+  -C                  Install file, unless the target already exists and is the same,\n\
+                      in which case the modification time won't be changed.\n\
+		      For compatibility with *BSD.\n\
   -d, --directory     treat all arguments as directory names; create all\n\
                         components of the specified directories\n\
 "), stdout);