maint: post-release administrivia

[debian/gzip] / util.c

diff --git a/util.c b/util.c
index ee34a3ae3c30b48ae21db51d3261161ba227f02f..c4c7f70532d6b14ff492dcecec25f542f500003f 100644 (file)
--- a/util.c
+++ b/util.c
@@ -1,6 +1,6 @@
 /* util.c -- utility functions for gzip support
 
-   Copyright (C) 1997-1999, 2001-2002, 2006, 2009-2011 Free Software
+   Copyright (C) 1997-1999, 2001-2002, 2006, 2009-2013 Free Software
    Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
@@ -31,16 +31,15 @@
 #include <errno.h>
 
 #include "gzip.h"
-#include "crypt.h"
 #include <xalloc.h>
 
 #ifndef CHAR_BIT
 #  define CHAR_BIT 8
 #endif
 
-static int write_buffer OF((int, voidp, unsigned int));
+static int write_buffer (int, voidp, unsigned int);
 
-extern ulg crc_32_tab[];   /* crc table, defined below */
+static const ulg crc_32_tab[];   /* crc table, defined below */
 
 /* ===========================================================================
  * Copy input to output unchanged: zcat == cat with --force.
@@ -133,16 +132,35 @@ int fill_inbuf(eof_ok)
 }
 
 /* Like the standard read function, except do not attempt to read more
-   than SSIZE_MAX bytes at a time.  */
+   than INT_MAX bytes at a time.  */
 int
 read_buffer (fd, buf, cnt)
      int fd;
      voidp buf;
      unsigned int cnt;
 {
+  int len;
   if (INT_MAX < cnt)
     cnt = INT_MAX;
-  return read (fd, buf, cnt);
+  len = read (fd, buf, cnt);
+
+#if defined F_SETFL && O_NONBLOCK && defined EAGAIN
+  /* Input files are opened O_NONBLOCK for security reasons.  On some
+     file systems this can cause read to fail with errno == EAGAIN.  */
+  if (len < 0 && errno == EAGAIN)
+    {
+      int flags = fcntl (fd, F_GETFL);
+      if (0 <= flags)
+        {
+          if (! (flags & O_NONBLOCK))
+            errno = EAGAIN;
+          else if (fcntl (fd, F_SETFL, flags & ~O_NONBLOCK) != -1)
+            len = read (fd, buf, cnt);
+        }
+    }
+#endif
+
+  return len;
 }
 
 /* Likewise for 'write'.  */
@@ -439,7 +457,7 @@ void fprint_off(file, offset, width)
 /* ========================================================================
  * Table of CRC-32's of all single-byte values (made by makecrc.c)
  */
-ulg crc_32_tab[] = {
+static const ulg crc_32_tab[] = {
   0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
   0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
   0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,