getpass.m4 3.15 KB
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# getpass.m4 serial 15
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dnl Copyright (C) 2002-2003, 2005-2006, 2009-2018 Free Software Foundation,
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dnl Inc.
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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.
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# Provide a getpass() function if the system doesn't have it.
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AC_DEFUN([gl_FUNC_GETPASS],
[
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  dnl Persuade Solaris <unistd.h> and <stdlib.h> to declare getpass().
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

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  AC_CHECK_FUNCS([getpass])
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  AC_CHECK_DECLS_ONCE([getpass])
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  if test $ac_cv_func_getpass = yes; then
    HAVE_GETPASS=1
  else
    HAVE_GETPASS=0
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  fi
])

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# Provide the GNU getpass() implementation. It supports passwords of
# arbitrary length (not just 8 bytes as on HP-UX).
AC_DEFUN([gl_FUNC_GETPASS_GNU],
[
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  dnl Persuade Solaris <unistd.h> and <stdlib.h> to declare getpass().
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

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  AC_CHECK_DECLS_ONCE([getpass])
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  dnl TODO: Detect when GNU getpass() is already found in glibc.
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  REPLACE_GETPASS=1

  if test $REPLACE_GETPASS = 1; then
    dnl We must choose a different name for our function, since on ELF systems
    dnl an unusable getpass() in libc.so would override our getpass() if it is
    dnl compiled into a shared library.
    AC_DEFINE([getpass], [gnu_getpass],
      [Define to a replacement function name for getpass().])
  fi
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])

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# Prerequisites of lib/getpass.c.
AC_DEFUN([gl_PREREQ_GETPASS], [
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  AC_CHECK_HEADERS_ONCE([stdio_ext.h termios.h])
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  AC_CHECK_FUNCS_ONCE([__fsetlocking])
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  AC_CHECK_DECLS([__fsetlocking],,,
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    [[#include <stdio.h>
      #if HAVE_STDIO_EXT_H
       #include <stdio_ext.h>
      #endif]])
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  AC_CHECK_DECLS_ONCE([fflush_unlocked])
  AC_CHECK_DECLS_ONCE([flockfile])
  AC_CHECK_DECLS_ONCE([fputs_unlocked])
  AC_CHECK_DECLS_ONCE([funlockfile])
  AC_CHECK_DECLS_ONCE([putc_unlocked])
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  dnl We can't use AC_CHECK_FUNC here, because tcgetattr() is defined as a
  dnl static inline function when compiling for Android 4.4 or older.
  AC_CACHE_CHECK([for tcgetattr], [gl_cv_func_tcgetattr],
    [AC_LINK_IFELSE(
       [AC_LANG_PROGRAM(
          [[#include <termios.h>
            struct termios x;
          ]],
          [[return tcgetattr(0,&x);]])
       ],
       [gl_cv_func_tcgetattr=yes],
       [gl_cv_func_tcgetattr=no])
    ])
  if test $gl_cv_func_tcgetattr = yes; then
    HAVE_TCGETATTR=1
  else
    HAVE_TCGETATTR=0
  fi
  AC_DEFINE_UNQUOTED([HAVE_TCGETATTR], [$HAVE_TCGETATTR],
    [Define to 1 if the system has the 'tcgetattr' function.])

  dnl We can't use AC_CHECK_FUNC here, because tcsetattr() is defined as a
  dnl static inline function when compiling for Android 4.4 or older.
  AC_CACHE_CHECK([for tcsetattr], [gl_cv_func_tcsetattr],
    [AC_LINK_IFELSE(
       [AC_LANG_PROGRAM(
          [[#include <termios.h>
            struct termios x;
          ]],
          [[return tcsetattr(0,0,&x);]])
       ],
       [gl_cv_func_tcsetattr=yes],
       [gl_cv_func_tcsetattr=no])
    ])
  if test $gl_cv_func_tcsetattr = yes; then
    HAVE_TCSETATTR=1
  else
    HAVE_TCSETATTR=0
  fi
  AC_DEFINE_UNQUOTED([HAVE_TCSETATTR], [$HAVE_TCSETATTR],
    [Define to 1 if the system has the 'tcsetattr' function.])
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])