kc3-lang/gnulib/lib/safe-read.c

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• Hash : a4fd2b6f
  Author :
  Date : 2018-05-05T10:27:38
  

  sys-limits.h: new file for crypto and safe I/O
  
  * lib/af_alg.c: Include sys-limits.h.
  (MAX_RW_COUNT): Remove.  Use replaced by SYS_BUFSIZE_MAX.
  (afalg_stream): Also reject negative sizes for sendfile; they
  should not happen and the code is a bit cleaner and faster this way.
  * lib/safe-read.c: Include sys-limits.h.
  (BUGGY_READ_MAXIMUM): Remove.  All uses replaced by SYS_BUFSIZE_MAX.
  * lib/sys-limits.h: New file, with values and commentary derived
  from the old safe-read.c and from GNU Emacs sysdep.c.
  * modules/crypto/md5, modules/crypto/sha1, modules/crypto/sha256:
  * modules/crypto/sha512, modules/safe-read, modules/safe-write:
  Add lib/sys-limits.h to Files section.
  

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• lib/safe-read.c

• /* An interface to read and write that retries after interrupts.
  
     Copyright (C) 1993-1994, 1998, 2002-2006, 2009-2018 Free Software
     Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #ifdef SAFE_WRITE
  # include "safe-write.h"
  #else
  # include "safe-read.h"
  #endif
  
  /* Get ssize_t.  */
  #include <sys/types.h>
  #include <unistd.h>
  
  #include <errno.h>
  
  #ifdef EINTR
  # define IS_EINTR(x) ((x) == EINTR)
  #else
  # define IS_EINTR(x) 0
  #endif
  
  #include "sys-limits.h"
  
  #ifdef SAFE_WRITE
  # define safe_rw safe_write
  # define rw write
  #else
  # define safe_rw safe_read
  # define rw read
  # undef const
  # define const /* empty */
  #endif
  
  /* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if
     interrupted.  Return the actual number of bytes read(written), zero for EOF,
     or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error.  */
  size_t
  safe_rw (int fd, void const *buf, size_t count)
  {
    for (;;)
      {
        ssize_t result = rw (fd, buf, count);
  
        if (0 <= result)
          return result;
        else if (IS_EINTR (errno))
          continue;
        else if (errno == EINVAL && SYS_BUFSIZE_MAX < count)
          count = SYS_BUFSIZE_MAX;
        else
          return result;
      }
  }
  

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