kc3-lang/gnulib/m4/fclose.m4

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• Hash : 2c2f6738
  Author :
  Date : 2023-04-26T06:06:03
  

  fclose: Make last change more maintainable.
  
  * m4/fclose.m4 (gl_FUNC_FCLOSE): Define through AC_DEFUN_ONCE. Don't
  modify REPLACE_FOPEN.
  * modules/fclose (Depends-on): Add comment.
  (configure.ac): Don't modify REPLACE_FOPEN. Don't duplicate actions of
  module 'fopen'.
  * m4/fopen.m4 (gl_FUNC_FOPEN_ITSELF): Renamed from gl_FUNC_FOPEN.
  (gl_FUNC_FOPEN): New macro.
  * modules/fopen (Files): Add m4/fclose.m4, m4/fflush.m4.
  * m4/close.m4 (gl_FUNC_CLOSE): Define through AC_DEFUN_ONCE.
  

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• m4/fclose.m4

• # fclose.m4 serial 11
  dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
  
  AC_DEFUN_ONCE([gl_FUNC_FCLOSE],
  [
    AC_REQUIRE([gl_STDIO_H_DEFAULTS])
    AC_REQUIRE([AC_CANONICAL_HOST])
  
    gl_FUNC_FFLUSH_STDIN
    case "$gl_cv_func_fflush_stdin" in
      *yes) ;;
      *) REPLACE_FCLOSE=1 ;;
    esac
  
    AC_REQUIRE([gl_FUNC_CLOSE])
    if test $REPLACE_CLOSE = 1; then
      REPLACE_FCLOSE=1
    fi
  
    case "$host_os" in
      openedition) REPLACE_FCLOSE=1 ;;
    esac
  
    if test $REPLACE_FCLOSE = 0; then
      gl_FUNC_FCLOSE_STDIN
      case "$gl_cv_func_fclose_stdin" in
        *yes) ;;
        *) REPLACE_FCLOSE=1 ;;
      esac
    fi
  ])
  
  dnl Determine whether fclose works on input streams.
  dnl Sets gl_cv_func_fclose_stdin.
  
  AC_DEFUN([gl_FUNC_FCLOSE_STDIN],
  [
    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
    AC_CHECK_HEADERS_ONCE([unistd.h])
    AC_CACHE_CHECK([whether fclose works on input streams],
      [gl_cv_func_fclose_stdin],
      [echo hello world > conftest.txt
       AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <fcntl.h>
              #include <stdio.h>
              #if HAVE_UNISTD_H
              # include <unistd.h>
              #else /* on Windows with MSVC */
              # include <io.h>
              #endif
             ]GL_MDA_DEFINES],
            [[int fd;
              int fd2;
              FILE *fp;
              fd = open ("conftest.txt", O_RDONLY);
              if (fd < 0)
                return 1;
              if (lseek (fd, 1, SEEK_SET) != 1)
                return 2;
              fd2 = dup (fd);
              if (fd2 < 0)
                return 3;
              fp = fdopen (fd2, "r");
              if (fp == NULL)
                return 4;
              if (fgetc (fp) != 'e')
                { fclose (fp); return 5; }
              /* This fclose() call should reposition the underlying file
                 descriptor.  */
              if (fclose (fp) != 0)
                return 6;
              if (lseek (fd2, 0, SEEK_CUR) != -1) /* should fail with EBADF */
                return 7;
              /* Verify the file position.  */
              if (lseek (fd, 0, SEEK_CUR) != 2)
                return 8;
              return 0;
            ]])],
         [gl_cv_func_fclose_stdin=yes],
         [gl_cv_func_fclose_stdin=no],
         [case "$host_os" in
                                # Guess no on glibc systems.
            *-gnu* | gnu*)      gl_cv_func_fclose_stdin="guessing no" ;;
                                # Guess yes on musl systems.
            *-musl* | midipix*) gl_cv_func_fclose_stdin="guessing yes" ;;
                                # Guess no on native Windows.
            mingw*)             gl_cv_func_fclose_stdin="guessing no" ;;
                                # If we don't know, obey --enable-cross-guesses.
            *)                  gl_cv_func_fclose_stdin="$gl_cross_guess_normal" ;;
          esac
         ])
       rm conftest.txt
      ])
  ])
  

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