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This patch adds a file posix-conf-vars.list that is used to generate macros to determine if a macro is defined as set, unset or not defined. gen-posix-conf-vars.awk processes this file and generates a header (posix-conf-vars-def.h) with these macros. A new header posix-conf-vars.h includes this generated header and defines accessor macros for the generated macros. Tested on x86_64. * posix/Makefile (before-compile): Add posix-conf-vars-def.h. ($(objpfx)posix-conf-vars-def.h): New target. * posix/posix-conf-vars.list: New file. * posix/posix-conf-vars.h: New file. * posix/confstr.c: Include posix-conf-vars.h. (confstr): Use CONF_IS_* macros. * posix/posix-envs.def: Include posix-conf-vars.h. Use CONF_IS_* macros. * scripts/gen-posix-conf-vars.awk: New file.
49 lines
2.0 KiB
C
49 lines
2.0 KiB
C
/* Macros to check if a POSIX configuration variable is defined or set.
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Copyright (C) 1991-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _POSIX_CONF_VARS_H
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#define _POSIX_CONF_VARS_H
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/* The script gen-posix-conf-vars.awk generates the header
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posix-conf-vars-def.h from the list file posix-conf-vars.list and defines
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CONF_DEF_* macros for each entry in the list file set to either of
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CONF_DEF_UNDEFINED, CONF_DEF_DEFINED_SET or CONF_DEF_DEFINED_UNSET. To
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check configuration variables within glibc code, use the configuration macro
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functions instead of checking for definitions of the macros. */
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#include <posix-conf-vars-def.h>
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#define CONF_DEF_UNDEFINED 1
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#define CONF_DEF_DEFINED_SET 2
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#define CONF_DEF_DEFINED_UNSET 3
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/* The configuration variable is not defined. */
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#define CONF_IS_UNDEFINED(conf) (CONF_DEF##conf == CONF_DEF_UNDEFINED)
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/* The configuration variable is defined. It may or may not be set. */
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#define CONF_IS_DEFINED(conf) (CONF_DEF##conf != CONF_DEF_UNDEFINED)
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/* The configuration variable is defined and set. */
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#define CONF_IS_DEFINED_SET(conf) (CONF_DEF##conf == CONF_DEF_DEFINED_SET)
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/* The configuration variable is defined but not set. */
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#define CONF_IS_DEFINED_UNSET(conf) (CONF_DEF##conf == CONF_DEF_DEFINED_UNSET)
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#endif
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