- updated info patch to restore "groups" docs

[packages/coreutils.git] / coreutils-utmp.patch

diff -Nur coreutils-4.5.9.orig/lib/readutmp.c coreutils-4.5.9/lib/readutmp.c
--- coreutils-4.5.9.orig/lib/readutmp.c	Sat Nov 17 14:29:42 2001
+++ coreutils-4.5.9/lib/readutmp.c	Sun Oct 27 21:58:30 2002
@@ -95,40 +96,31 @@
 }
 
 #else
+#define UTMP_READ_INCR 128
 
 int
 read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
 {
-  FILE *utmp;
-  struct stat file_stats;
-  size_t n_read;
-  size_t size;
-  STRUCT_UTMP *buf;
-
-  utmp = fopen (filename, "r");
-  if (utmp == NULL)
-    return 1;
-
-  fstat (fileno (utmp), &file_stats);
-  size = file_stats.st_size;
-  if (size > 0)
-    buf = (STRUCT_UTMP *) xmalloc (size);
-  else
-    {
-      fclose (utmp);
-      return 1;
-    }
-
-  /* Use < instead of != in case the utmp just grew.  */
-  n_read = fread (buf, 1, size, utmp);
-  if (ferror (utmp) || fclose (utmp) == EOF
-      || n_read < size)
-    return 1;
+    int n_read;
+    STRUCT_UTMP *uptr;
 
-  *n_entries = size / sizeof (STRUCT_UTMP);
-  *utmp_buf = buf;
-
-  return 0;
+    utmpname(filename);
+    setutent();
+    n_read = 0;
+    utmp_contents = (STRUCT_UTMP *) xmalloc(UTMP_READ_INCR*sizeof(STRUCT_UTMP));
+    while ((uptr=getutent())) {
+	if (NULL == utmp_contents)
+	    break;  /* we do not have more memory here */
+	memcpy(&utmp_contents[n_read], uptr, sizeof(STRUCT_UTMP));
+	n_read++;
+	if (0 == ( n_read % UTMP_READ_INCR ))
+	    utmp_contents = (STRUCT_UTMP *)
+		xrealloc(utmp_contents,
+			 (n_read + UTMP_READ_INCR) * sizeof(STRUCT_UTMP));
+    }
+   
+    endutent();
+    return n_read;
 }
 
 #endif