kc3-lang/gnulib/lib/pread.c

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• Hash : d0450ae9
  Author :
  Date : 2024-01-17T21:53:15
  

  Improve naming of local variables.
  
  * gnulib-tool, posix-modules, build-aux/relocatable.sh.in,
  build-aux/reloc-ldflags, build-aux/install-reloc, tests/init.sh,
  m4/argz.m4: Rename save_IFS to saved_IFS.
  * m4/*.m4: Rename save_LIBS to saved_LIBS.
  * m4/00gnulib.m4, m4/gnulib-common.m4, m4/warn-on-use.m4, m4/wchar_h.m4:
  Rename save_ac_compile to saved_ac_compile.
  * m4/00gnulib.m4: Rename ac_save_ac_compile to ac_saved_ac_compile.
  * m4/gnulib-common.m4: Rename save_ac_compile_for_check_decl to
  saved_ac_compile_for_check_decl.
  * m4/assert_h.m4, m4/manywarnings.m4, m4/stdalign.m4, m4/visibility.m4:
  Rename gl_save_CFLAGS to gl_saved_CFLAGS.
  * m4/dirfd.m4: Rename dirfd_save_CFLAGS to gl_saved_CFLAGS.
  * m4/include_next.m4, m4/pread.m4, m4/pwrite.m4, m4/termcap.m4,
  m4/terminfo.m4: Rename gl_save_CPPFLAGS to gl_saved_CPPFLAGS.
  * m4/lib-link.m4: Rename ac_save_CPPFLAGS to acl_save_CPPFLAGS.
  * m4/iconv.m4, m4/readline.m4: Rename am_save_CPPFLAGS to
  gl_saved_CPPFLAGS.
  * m4/gettext.m4: Rename gt_save_CPPFLAGS to gt_saved_CPPFLAGS.
  * m4/ansi-c++.m4: Rename gl_save_CXX to gl_saved_CXX.
  * m4/manywarnings-c++.m4: Rename gl_save_CXXFLAGS to gl_saved_CXXFLAGS.
  * m4/lib-link.m4: Rename acl_save_ifs to acl_saved_IFS.
  * m4/lib-prefix.m4: Rename acl_save_IFS to acl_saved_IFS.
  * m4/progtest.m4: Rename ac_save_IFS to gt_saved_IFS.
  * m4/lib-link.m4: Rename save_libdir to saved_libdir, acl_save_libdir to
  acl_saved_libdir.
  * m4/ld-version-script.m4: Rename save_LDFLAGS to saved_LDFLAGS.
  * m4/acl.m4, m4/getgroups.m4: Rename ac_save_LIBS to gl_saved_LIBS.
  * m4/lib-link.m4: Rename ac_save_LIBS to acl_saved_LIBS.
  * m4/getdomainname.m4, m4/gethostname.m4, m4/getloadavg.m4,
  m4/hostent.m4, m4/inet_ntop.m4, m4/inet_pton.m4,
  m4/pthread_mutex_timedlock.m4, m4/pthread_sigmask.m4,
  m4/pthread-spin.m4, m4/readutmp.m4, m4/selinux-selinux-h.m4,
  m4/servent.m4, m4/socketlib.m4, m4/termcap.m4, m4/terminfo.m4,
  m4/thread.m4: Rename gl_save_LIBS to gl_saved_LIBS.
  * m4/getaddrinfo.m4, m4/iconv.m4, m4/readline.m4: Rename am_save_LIBS to
  gl_saved_LIBS.
  * m4/gettext.m4, m4/intlmacosx.m4: Rename gt_save_LIBS to gt_saved_LIBS.
  * m4/libunistring.m4: Rename glus_save_LIBS to glus_saved_LIBS.
  * m4/nanosleep.m4: Rename nanosleep_save_libs to gl_saved_LIBS.
  * m4/lib-prefix.m4: Rename acl_save_prefix to acl_saved_prefix,
  acl_save_exec_prefix to acl_saved_exec_prefix.
  * m4/configmake.m4: Rename gl_save_<variable> to gl_saved_<variable>.
  * m4/terminfo.m4: Likewise.
  * m4/gettext.m4: Rename gt_save_<variable> to gt_saved_<variable>.
  * m4/javaexec.m4: Rename save_CLASSPATH to gt_saved_CLASSPATH.
  * m4/warnings.m4: Rename gl_save_compiler_FLAGS to
  gl_saved_compiler_FLAGS.
  * lib/pread.c, lib/pwrite.c, lib/read-file.c, lib/tempname.c: Rename
  save_errno to saved_errno.
  * lib/read-file.c: Rename save_alloc to saved_alloc.
  * lib/strptime.c: Rename save_wday to saved_wday, save_mday to
  saved_mday, save_mon to saved_mon.
  

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• lib/pread.c

• /* replacement pread function
     Copyright (C) 2009-2024 Free Software Foundation, Inc.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation; either version 2.1 of the
     License, or (at your option) any later version.
  
     This file 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 Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  #include <errno.h>
  
  #define __libc_lseek(f,o,w) lseek (f, o, w)
  #define __set_errno(Val) errno = (Val)
  #define __libc_read(f,b,n) read (f, b, n)
  
  /* pread substitute for systems that the function, such as mingw32 and BeOS.  */
  /* The following is identical to the function from glibc's
     sysdeps/posix/pread.c */
  
  /* Note: This implementation of pread is not multithread-safe.  */
  
  ssize_t
  pread (int fd, void *buf, size_t nbyte, off_t offset)
  {
    /* Since we must not change the file pointer preserve the value so that
       we can restore it later.  */
    int saved_errno;
    ssize_t result;
    off_t old_offset = __libc_lseek (fd, 0, SEEK_CUR);
    if (old_offset == (off_t) -1)
      return -1;
  
    /* Set to wanted position.  */
    if (__libc_lseek (fd, offset, SEEK_SET) == (off_t) -1)
      return -1;
  
    /* Write out the data.  */
    result = __libc_read (fd, buf, nbyte);
  
    /* Now we have to restore the position.  If this fails we have to
       return this as an error.  But if the writing also failed we
       return this error.  */
    saved_errno = errno;
    if (__libc_lseek (fd, old_offset, SEEK_SET) == (off_t) -1)
      {
        if (result == -1)
          __set_errno (saved_errno);
        return -1;
      }
    __set_errno (saved_errno);
  
    return result;
  }
  

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