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79be9c6153
clang warns that alias will be always resolve to _GI___confstr even if weak definition of __GI_confstr is overridden, which is really the intention.
301 lines
9.1 KiB
C
301 lines
9.1 KiB
C
/* Copyright (C) 1991-2024 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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<https://www.gnu.org/licenses/>. */
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#include <stddef.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <confstr.h>
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#include "../version.h"
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#include <libc-diag.h>
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#define NEED_SPEC_ARRAY 0
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#include <posix-conf-vars.h>
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/* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
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of BUF with the value corresponding to NAME and zero-terminate BUF.
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Return the number of bytes required to hold NAME's entire value. */
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size_t
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__confstr (int name, char *buf, size_t len)
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{
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const char *string = "";
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size_t string_len = 1;
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/* Note that this buffer must be large enough for the longest strings
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used below. */
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char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"];
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switch (name)
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{
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case _CS_PATH:
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{
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static const char cs_path[] = CS_PATH;
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string = cs_path;
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string_len = sizeof (cs_path);
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}
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break;
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/* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS
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and _CS_V5_WIDTH_RESTRICTED_ENVS:
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We have to return a newline-separated list of names of
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programming environments in which the widths of blksize_t,
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cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
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ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
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wint_t types are no greater than the width of type long.
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Currently this means all environments that the system allows. */
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#define START_ENV_GROUP(VERSION) \
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case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS: \
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string_len = 0;
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#define END_ENV_GROUP(VERSION) \
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restenvs[string_len++] = '\0'; \
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string = restenvs; \
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break;
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#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
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/* Empty. */
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#define KNOWN_PRESENT_ENV_STRING(STR) \
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if (string_len > 0) \
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restenvs[string_len++] = '\n'; \
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memcpy (restenvs + string_len, STR, \
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sizeof STR - 1); \
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string_len += sizeof STR - 1;
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#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
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KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX)
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#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
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if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0) \
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{ \
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KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX) \
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}
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#include "posix-envs.def"
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#undef START_ENV_GROUP
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#undef END_ENV_GROUP
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#undef KNOWN_ABSENT_ENVIRONMENT
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#undef KNOWN_PRESENT_ENV_STRING
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#undef KNOWN_PRESENT_ENVIRONMENT
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#undef UNKNOWN_ENVIRONMENT
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case _CS_XBS5_ILP32_OFF32_CFLAGS:
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case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
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case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
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#ifdef __ILP32_OFF32_CFLAGS
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# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32)
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# error "__ILP32_OFF32_CFLAGS should not be defined"
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# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
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if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
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break;
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# endif
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string = __ILP32_OFF32_CFLAGS;
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string_len = sizeof (__ILP32_OFF32_CFLAGS);
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#endif
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break;
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case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
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case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
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case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
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#ifdef __ILP32_OFFBIG_CFLAGS
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# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
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# error "__ILP32_OFFBIG_CFLAGS should not be defined"
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# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
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if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
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break;
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# endif
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string = __ILP32_OFFBIG_CFLAGS;
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string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
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#endif
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break;
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case _CS_XBS5_LP64_OFF64_CFLAGS:
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case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
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case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
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#ifdef __LP64_OFF64_CFLAGS
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# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
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# error "__LP64_OFF64_CFLAGS should not be defined"
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# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
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if (__sysconf (_SC_V7_LP64_OFF64) < 0)
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break;
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# endif
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string = __LP64_OFF64_CFLAGS;
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string_len = sizeof (__LP64_OFF64_CFLAGS);
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#endif
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break;
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case _CS_XBS5_ILP32_OFF32_LDFLAGS:
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case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
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case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
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#ifdef __ILP32_OFF32_LDFLAGS
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# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 )
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# error "__ILP32_OFF32_LDFLAGS should not be defined"
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# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
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if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
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break;
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# endif
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string = __ILP32_OFF32_LDFLAGS;
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string_len = sizeof (__ILP32_OFF32_LDFLAGS);
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#endif
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break;
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case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
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case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
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case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
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#ifdef __ILP32_OFFBIG_LDFLAGS
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# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
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# error "__ILP32_OFFBIG_LDFLAGS should not be defined"
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# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
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if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
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break;
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# endif
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string = __ILP32_OFFBIG_LDFLAGS;
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string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
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#endif
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break;
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case _CS_XBS5_LP64_OFF64_LDFLAGS:
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case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
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case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
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#ifdef __LP64_OFF64_LDFLAGS
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# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
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# error "__LP64_OFF64_LDFLAGS should not be defined"
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# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
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if (__sysconf (_SC_V7_LP64_OFF64) < 0)
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break;
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# endif
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string = __LP64_OFF64_LDFLAGS;
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string_len = sizeof (__LP64_OFF64_LDFLAGS);
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#endif
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break;
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case _CS_LFS_CFLAGS:
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case _CS_LFS_LINTFLAGS:
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#if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \
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&& CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG))
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# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
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/* Signal that we want the new ABI. */
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string = __LFS_CFLAGS;
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string_len = sizeof (__LFS_CFLAGS);
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#endif
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break;
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case _CS_LFS_LDFLAGS:
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case _CS_LFS_LIBS:
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/* No special libraries or linker flags needed. */
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break;
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case _CS_LFS64_CFLAGS:
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case _CS_LFS64_LINTFLAGS:
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#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
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string = __LFS64_CFLAGS;
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string_len = sizeof (__LFS64_CFLAGS);
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break;
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case _CS_LFS64_LDFLAGS:
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case _CS_LFS64_LIBS:
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/* No special libraries or linker flags needed. */
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break;
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case _CS_XBS5_ILP32_OFF32_LIBS:
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case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
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case _CS_XBS5_ILP32_OFFBIG_LIBS:
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case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
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case _CS_XBS5_LP64_OFF64_LIBS:
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case _CS_XBS5_LP64_OFF64_LINTFLAGS:
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case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
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case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
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case _CS_XBS5_LPBIG_OFFBIG_LIBS:
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case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
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case _CS_POSIX_V6_ILP32_OFF32_LIBS:
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case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
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case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
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case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
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case _CS_POSIX_V6_LP64_OFF64_LIBS:
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case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
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case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
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case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
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case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
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case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
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case _CS_POSIX_V7_ILP32_OFF32_LIBS:
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case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS:
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case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
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case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS:
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case _CS_POSIX_V7_LP64_OFF64_LIBS:
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case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS:
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case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
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case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
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case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
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case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS:
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/* GNU libc does not require special actions to use LFS functions. */
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break;
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case _CS_GNU_LIBC_VERSION:
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string = "glibc " VERSION;
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string_len = sizeof ("glibc " VERSION);
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break;
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case _CS_GNU_LIBPTHREAD_VERSION:
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#ifdef LIBPTHREAD_VERSION
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string = LIBPTHREAD_VERSION;
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string_len = sizeof LIBPTHREAD_VERSION;
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break;
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#else
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/* No thread library. */
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__set_errno (EINVAL);
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return 0;
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#endif
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case _CS_V6_ENV:
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case _CS_V7_ENV:
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/* Maybe something else is needed in future. */
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string = "POSIXLY_CORRECT=1";
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string_len = sizeof ("POSIXLY_CORRECT=1");
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break;
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default:
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__set_errno (EINVAL);
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return 0;
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}
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if (len > 0 && buf != NULL)
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{
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if (string_len <= len)
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memcpy (buf, string, string_len);
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else
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{
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memcpy (buf, string, len - 1);
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buf[len - 1] = '\0';
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}
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}
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return string_len;
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}
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libc_hidden_def (__confstr)
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/* clang warns that alias will be always resolve to _GI___confstr even if weak
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definition of __GI_confstr is overridden, which is really the intention. */
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DIAG_PUSH_NEEDS_COMMENT_CLANG;
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DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wignored-attributes");
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libc_hidden_def (confstr)
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DIAG_POP_NEEDS_COMMENT_CLANG;
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weak_alias (__confstr, confstr)
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