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Diffstat (limited to 'REORG.TODO/posix/confstr.c')
| -rw-r--r-- | REORG.TODO/posix/confstr.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/REORG.TODO/posix/confstr.c b/REORG.TODO/posix/confstr.c new file mode 100644 index 0000000000..159a55788e --- /dev/null +++ b/REORG.TODO/posix/confstr.c @@ -0,0 +1,292 @@ +/* Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library 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. + + The GNU C Library 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 the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <stddef.h> +#include <errno.h> +#include <unistd.h> +#include <string.h> +#include <confstr.h> +#include "../version.h" + +#define NEED_SPEC_ARRAY 0 +#include <posix-conf-vars.h> + +/* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes + of BUF with the value corresponding to NAME and zero-terminate BUF. + Return the number of bytes required to hold NAME's entire value. */ +size_t +confstr (int name, char *buf, size_t len) +{ + const char *string = ""; + size_t string_len = 1; + + /* Note that this buffer must be large enough for the longest strings + used below. */ + char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"]; + + switch (name) + { + case _CS_PATH: + { + static const char cs_path[] = CS_PATH; + string = cs_path; + string_len = sizeof (cs_path); + } + break; + + /* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS + and _CS_V5_WIDTH_RESTRICTED_ENVS: + + We have to return a newline-separated list of names of + programming environments in which the widths of blksize_t, + cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t, + ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and + wint_t types are no greater than the width of type long. + + Currently this means all environments that the system allows. */ + +#define START_ENV_GROUP(VERSION) \ + case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS: \ + string_len = 0; + +#define END_ENV_GROUP(VERSION) \ + restenvs[string_len++] = '\0'; \ + string = restenvs; \ + break; + +#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \ + /* Empty. */ + +#define KNOWN_PRESENT_ENV_STRING(STR) \ + if (string_len > 0) \ + restenvs[string_len++] = '\n'; \ + memcpy (restenvs + string_len, STR, \ + sizeof STR - 1); \ + string_len += sizeof STR - 1; + +#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \ + KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX) + +#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \ + if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0) \ + { \ + KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX) \ + } + +#include "posix-envs.def" + +#undef START_ENV_GROUP +#undef END_ENV_GROUP +#undef KNOWN_ABSENT_ENVIRONMENT +#undef KNOWN_PRESENT_ENV_STRING +#undef KNOWN_PRESENT_ENVIRONMENT +#undef UNKNOWN_ENVIRONMENT + + case _CS_XBS5_ILP32_OFF32_CFLAGS: + case _CS_POSIX_V6_ILP32_OFF32_CFLAGS: + case _CS_POSIX_V7_ILP32_OFF32_CFLAGS: +#ifdef __ILP32_OFF32_CFLAGS +# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32) +# error "__ILP32_OFF32_CFLAGS should not be defined" +# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32) + if (__sysconf (_SC_V7_ILP32_OFF32) < 0) + break; +# endif + string = __ILP32_OFF32_CFLAGS; + string_len = sizeof (__ILP32_OFF32_CFLAGS); +#endif + break; + + case _CS_XBS5_ILP32_OFFBIG_CFLAGS: + case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS: + case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS: +#ifdef __ILP32_OFFBIG_CFLAGS +# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG) +# error "__ILP32_OFFBIG_CFLAGS should not be defined" +# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG) + if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0) + break; +# endif + string = __ILP32_OFFBIG_CFLAGS; + string_len = sizeof (__ILP32_OFFBIG_CFLAGS); +#endif + break; + + case _CS_XBS5_LP64_OFF64_CFLAGS: + case _CS_POSIX_V6_LP64_OFF64_CFLAGS: + case _CS_POSIX_V7_LP64_OFF64_CFLAGS: +#ifdef __LP64_OFF64_CFLAGS +# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64) +# error "__LP64_OFF64_CFLAGS should not be defined" +# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64) + if (__sysconf (_SC_V7_LP64_OFF64) < 0) + break; +# endif + string = __LP64_OFF64_CFLAGS; + string_len = sizeof (__LP64_OFF64_CFLAGS); +#endif + break; + + case _CS_XBS5_ILP32_OFF32_LDFLAGS: + case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS: + case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS: +#ifdef __ILP32_OFF32_LDFLAGS +# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 ) +# error "__ILP32_OFF32_LDFLAGS should not be defined" +# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32) + if (__sysconf (_SC_V7_ILP32_OFF32) < 0) + break; +# endif + string = __ILP32_OFF32_LDFLAGS; + string_len = sizeof (__ILP32_OFF32_LDFLAGS); +#endif + break; + + case _CS_XBS5_ILP32_OFFBIG_LDFLAGS: + case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS: + case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS: +#ifdef __ILP32_OFFBIG_LDFLAGS +# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG) +# error "__ILP32_OFFBIG_LDFLAGS should not be defined" +# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG) + if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0) + break; +# endif + string = __ILP32_OFFBIG_LDFLAGS; + string_len = sizeof (__ILP32_OFFBIG_LDFLAGS); +#endif + break; + + case _CS_XBS5_LP64_OFF64_LDFLAGS: + case _CS_POSIX_V6_LP64_OFF64_LDFLAGS: + case _CS_POSIX_V7_LP64_OFF64_LDFLAGS: +#ifdef __LP64_OFF64_LDFLAGS +# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64) +# error "__LP64_OFF64_LDFLAGS should not be defined" +# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64) + if (__sysconf (_SC_V7_LP64_OFF64) < 0) + break; +# endif + string = __LP64_OFF64_LDFLAGS; + string_len = sizeof (__LP64_OFF64_LDFLAGS); +#endif + break; + + case _CS_LFS_CFLAGS: + case _CS_LFS_LINTFLAGS: +#if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \ + && CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG)) +# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" + /* Signal that we want the new ABI. */ + string = __LFS_CFLAGS; + string_len = sizeof (__LFS_CFLAGS); +#endif + break; + + case _CS_LFS_LDFLAGS: + case _CS_LFS_LIBS: + /* No special libraries or linker flags needed. */ + break; + + case _CS_LFS64_CFLAGS: + case _CS_LFS64_LINTFLAGS: +#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE" + string = __LFS64_CFLAGS; + string_len = sizeof (__LFS64_CFLAGS); + break; + + case _CS_LFS64_LDFLAGS: + case _CS_LFS64_LIBS: + /* No special libraries or linker flags needed. */ + break; + + case _CS_XBS5_ILP32_OFF32_LIBS: + case _CS_XBS5_ILP32_OFF32_LINTFLAGS: + case _CS_XBS5_ILP32_OFFBIG_LIBS: + case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS: + case _CS_XBS5_LP64_OFF64_LIBS: + case _CS_XBS5_LP64_OFF64_LINTFLAGS: + case _CS_XBS5_LPBIG_OFFBIG_CFLAGS: + case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS: + case _CS_XBS5_LPBIG_OFFBIG_LIBS: + case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS: + + case _CS_POSIX_V6_ILP32_OFF32_LIBS: + case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS: + case _CS_POSIX_V6_ILP32_OFFBIG_LIBS: + case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS: + case _CS_POSIX_V6_LP64_OFF64_LIBS: + case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS: + case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS: + case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS: + case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS: + case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS: + + case _CS_POSIX_V7_ILP32_OFF32_LIBS: + case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS: + case _CS_POSIX_V7_ILP32_OFFBIG_LIBS: + case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS: + case _CS_POSIX_V7_LP64_OFF64_LIBS: + case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS: + case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS: + case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS: + case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS: + case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS: + /* GNU libc does not require special actions to use LFS functions. */ + break; + + case _CS_GNU_LIBC_VERSION: + string = "glibc " VERSION; + string_len = sizeof ("glibc " VERSION); + break; + + case _CS_GNU_LIBPTHREAD_VERSION: +#ifdef LIBPTHREAD_VERSION + string = LIBPTHREAD_VERSION; + string_len = sizeof LIBPTHREAD_VERSION; + break; +#else + /* No thread library. */ + __set_errno (EINVAL); + return 0; +#endif + + case _CS_V6_ENV: + case _CS_V7_ENV: + /* Maybe something else is needed in future. */ + string = "POSIXLY_CORRECT=1"; + string_len = sizeof ("POSIXLY_CORRECT=1"); + break; + + default: + __set_errno (EINVAL); + return 0; + } + + if (len > 0 && buf != NULL) + { + if (string_len <= len) + memcpy (buf, string, string_len); + else + { + memcpy (buf, string, len - 1); + buf[len - 1] = '\0'; + } + } + return string_len; +} +libc_hidden_def (confstr) |