glibc/stdlib/getenv.c

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/* Copyright (C) 1991,92,94,96,98,99,2002,2005 Free Software Foundation, Inc.
update from main archive 961207 Sun Dec 8 06:56:49 1996 Ulrich Drepper <drepper@cygnus.com> * io/getwd.c: Use PATH_MAX not LOCAL_PATH_MAX. Fix typo in comment. * stdlib/canonicalize.c: Correct bugs in last change. Patch by HJ Lu. * libio/Makefile (routines): Remove ioprims. (aux): Remove cleanup. Add IO_DEBUG option for .o files. * libio/cleanups.c: Removed. * libio/ioprims.c: Removed. * libio/filedoalloc.c: More updates from libg++-2.8b5. * libio/fileops.c: Likewise. * libio/genops.c: Likewise. * libio/iolibio.h: Likewise. * libio/iopopen.c: Likewise. * libio/iovsprintf.c: Likewise. * libio/iovsscanf.c: Likewise. * libio/libio.h: Likewise. * libio/libioP.h: Likewise. * libio/memstream.c: Likewise. * libio/strfile.h: Likewise. * libio/vasprintf.c: Likewise. * libio/vsnprintf.c: Likewise. * libio/stdio.h: Define P_tmpdir only is __USE_SVID. * manual/arith.texi: Change references to ANSI C to ISO C. * manual/conf.texi: Likewise. * manual/creature.texi: Likewise. * manual/ctype.texi: Likewise. * manual/errno.texi: Likewise. * manual/filesys.texi: Likewise. * manual/intro.texi. Likewise. * manual/io.texi: Likewise. * manual/lang.texi: Likewise. * manual/libc.texinfo: Likewise. * manual/locale.texi: Likewise. * manual/maint.texi: Likewise. * manual/mbyte.texi: Likewise. * manual/memory.texi: Likewise. * manual/process.texi: Likewise. * manual/process.texi: Likewise. * manual/search.texi: Likewise. * manual/setjmp.texi: Likewise. * manual/signal.texi: Likewise. * manual/startup.texi: Likewise. * manual/stdio.texi: Likewise. * manual/string.texi: Likewise. * manual/time.texi: Likewise. * manual/locale.texi: Remove description of LC_RESPONSE and add LC_MESSAGES. * Makefile (subdirs): Change malloc in $(malloc). * config.make.in: Add variable malloc which is initialized from @malloc@. * configure.in: Add new option --enable-new-malloc to use new malloc. This is the default on Linux. * sysdeps/unix/sysv/linux/configure.in: Define malloc to new-malloc by default. * new-malloc/Makefile: New file. Improved malloc implementation. * new-malloc/malloc.c: Likewise. * new-malloc/malloc.h: Likewise. * new-malloc/mallocbug.c: Likewise. * new-malloc/obstack.c: Likewise. * new-malloc/obstack.h: Likewise. * new-malloc/thread-m.h: Likewise. * time/Makefile: Compile ap.c with NO_MCHECK flag for now. * time/ap.c: Don't call mcheck if NO_MCHECK is defined. * resolv/Makefile: Add rule to rebuiild libresolv.so when libc.so changed. * stdio/feof.c: Update copyright. * stdio/stdio.h: Add field for lock to FILE structure. Add cast to *MAGIC constants to prevent warnings. * stdio-common/bug7.c: Correct test. Stream must not be closed twice. * stdlib/Makefile (routines): Add secure-getenv. * stdlib/secure-getenv.c: New file. __secure_getenv function moved to here from sysdeps/generic/getenv.c. Otherwise an application cannot replace the getenv function in the libc. * sysdeps/generic/getenv.c: Remove __secure_getenv function. * sysdeps/stub/getenv.c: Remove __secure_getenv alias. * sysdeps/mach/libc-lock.h: Define__libc_mutex_lock to __mutex_lock. * sysdeps/posix/fdopen.c: Update copyright. Don't use EXFUN. * time/test-tz.c: Comment fifth test out. PROBLEM. * time/tzset.c: De-ANSI-declfy. (__tzset): Don't increment pointer tz when no DST information is given. Sat Dec 7 23:47:54 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/mach/libc-lock.h [_LIBC]: Add definition of __libc_mutex_lock. Patch by Thomas Bushnell. * sysdeps/unix/sysv/linux/timebits.h: Load <asm/param.h> only if __USE_MISC. * sysdeps/unix/sysv/linux/Dist: Add llseek.c. Sat Dec 7 12:18:56 1996 Ulrich Drepper <drepper@cygnus.com> * time/strftime (%c format): Remove %Z from default string. Reported by Paul Eggert * io/getwd.c: Don't apply getcwd on user supplied buffer.
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This file is part of the GNU C Library.
1995-02-18 01:27:10 +00:00
update from main archive 961207 Sun Dec 8 06:56:49 1996 Ulrich Drepper <drepper@cygnus.com> * io/getwd.c: Use PATH_MAX not LOCAL_PATH_MAX. Fix typo in comment. * stdlib/canonicalize.c: Correct bugs in last change. Patch by HJ Lu. * libio/Makefile (routines): Remove ioprims. (aux): Remove cleanup. Add IO_DEBUG option for .o files. * libio/cleanups.c: Removed. * libio/ioprims.c: Removed. * libio/filedoalloc.c: More updates from libg++-2.8b5. * libio/fileops.c: Likewise. * libio/genops.c: Likewise. * libio/iolibio.h: Likewise. * libio/iopopen.c: Likewise. * libio/iovsprintf.c: Likewise. * libio/iovsscanf.c: Likewise. * libio/libio.h: Likewise. * libio/libioP.h: Likewise. * libio/memstream.c: Likewise. * libio/strfile.h: Likewise. * libio/vasprintf.c: Likewise. * libio/vsnprintf.c: Likewise. * libio/stdio.h: Define P_tmpdir only is __USE_SVID. * manual/arith.texi: Change references to ANSI C to ISO C. * manual/conf.texi: Likewise. * manual/creature.texi: Likewise. * manual/ctype.texi: Likewise. * manual/errno.texi: Likewise. * manual/filesys.texi: Likewise. * manual/intro.texi. Likewise. * manual/io.texi: Likewise. * manual/lang.texi: Likewise. * manual/libc.texinfo: Likewise. * manual/locale.texi: Likewise. * manual/maint.texi: Likewise. * manual/mbyte.texi: Likewise. * manual/memory.texi: Likewise. * manual/process.texi: Likewise. * manual/process.texi: Likewise. * manual/search.texi: Likewise. * manual/setjmp.texi: Likewise. * manual/signal.texi: Likewise. * manual/startup.texi: Likewise. * manual/stdio.texi: Likewise. * manual/string.texi: Likewise. * manual/time.texi: Likewise. * manual/locale.texi: Remove description of LC_RESPONSE and add LC_MESSAGES. * Makefile (subdirs): Change malloc in $(malloc). * config.make.in: Add variable malloc which is initialized from @malloc@. * configure.in: Add new option --enable-new-malloc to use new malloc. This is the default on Linux. * sysdeps/unix/sysv/linux/configure.in: Define malloc to new-malloc by default. * new-malloc/Makefile: New file. Improved malloc implementation. * new-malloc/malloc.c: Likewise. * new-malloc/malloc.h: Likewise. * new-malloc/mallocbug.c: Likewise. * new-malloc/obstack.c: Likewise. * new-malloc/obstack.h: Likewise. * new-malloc/thread-m.h: Likewise. * time/Makefile: Compile ap.c with NO_MCHECK flag for now. * time/ap.c: Don't call mcheck if NO_MCHECK is defined. * resolv/Makefile: Add rule to rebuiild libresolv.so when libc.so changed. * stdio/feof.c: Update copyright. * stdio/stdio.h: Add field for lock to FILE structure. Add cast to *MAGIC constants to prevent warnings. * stdio-common/bug7.c: Correct test. Stream must not be closed twice. * stdlib/Makefile (routines): Add secure-getenv. * stdlib/secure-getenv.c: New file. __secure_getenv function moved to here from sysdeps/generic/getenv.c. Otherwise an application cannot replace the getenv function in the libc. * sysdeps/generic/getenv.c: Remove __secure_getenv function. * sysdeps/stub/getenv.c: Remove __secure_getenv alias. * sysdeps/mach/libc-lock.h: Define__libc_mutex_lock to __mutex_lock. * sysdeps/posix/fdopen.c: Update copyright. Don't use EXFUN. * time/test-tz.c: Comment fifth test out. PROBLEM. * time/tzset.c: De-ANSI-declfy. (__tzset): Don't increment pointer tz when no DST information is given. Sat Dec 7 23:47:54 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/mach/libc-lock.h [_LIBC]: Add definition of __libc_mutex_lock. Patch by Thomas Bushnell. * sysdeps/unix/sysv/linux/timebits.h: Load <asm/param.h> only if __USE_MISC. * sysdeps/unix/sysv/linux/Dist: Add llseek.c. Sat Dec 7 12:18:56 1996 Ulrich Drepper <drepper@cygnus.com> * time/strftime (%c format): Remove %Z from default string. Reported by Paul Eggert * io/getwd.c: Don't apply getcwd on user supplied buffer.
1996-12-08 08:01:13 +00:00
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.
1995-02-18 01:27:10 +00:00
update from main archive 961207 Sun Dec 8 06:56:49 1996 Ulrich Drepper <drepper@cygnus.com> * io/getwd.c: Use PATH_MAX not LOCAL_PATH_MAX. Fix typo in comment. * stdlib/canonicalize.c: Correct bugs in last change. Patch by HJ Lu. * libio/Makefile (routines): Remove ioprims. (aux): Remove cleanup. Add IO_DEBUG option for .o files. * libio/cleanups.c: Removed. * libio/ioprims.c: Removed. * libio/filedoalloc.c: More updates from libg++-2.8b5. * libio/fileops.c: Likewise. * libio/genops.c: Likewise. * libio/iolibio.h: Likewise. * libio/iopopen.c: Likewise. * libio/iovsprintf.c: Likewise. * libio/iovsscanf.c: Likewise. * libio/libio.h: Likewise. * libio/libioP.h: Likewise. * libio/memstream.c: Likewise. * libio/strfile.h: Likewise. * libio/vasprintf.c: Likewise. * libio/vsnprintf.c: Likewise. * libio/stdio.h: Define P_tmpdir only is __USE_SVID. * manual/arith.texi: Change references to ANSI C to ISO C. * manual/conf.texi: Likewise. * manual/creature.texi: Likewise. * manual/ctype.texi: Likewise. * manual/errno.texi: Likewise. * manual/filesys.texi: Likewise. * manual/intro.texi. Likewise. * manual/io.texi: Likewise. * manual/lang.texi: Likewise. * manual/libc.texinfo: Likewise. * manual/locale.texi: Likewise. * manual/maint.texi: Likewise. * manual/mbyte.texi: Likewise. * manual/memory.texi: Likewise. * manual/process.texi: Likewise. * manual/process.texi: Likewise. * manual/search.texi: Likewise. * manual/setjmp.texi: Likewise. * manual/signal.texi: Likewise. * manual/startup.texi: Likewise. * manual/stdio.texi: Likewise. * manual/string.texi: Likewise. * manual/time.texi: Likewise. * manual/locale.texi: Remove description of LC_RESPONSE and add LC_MESSAGES. * Makefile (subdirs): Change malloc in $(malloc). * config.make.in: Add variable malloc which is initialized from @malloc@. * configure.in: Add new option --enable-new-malloc to use new malloc. This is the default on Linux. * sysdeps/unix/sysv/linux/configure.in: Define malloc to new-malloc by default. * new-malloc/Makefile: New file. Improved malloc implementation. * new-malloc/malloc.c: Likewise. * new-malloc/malloc.h: Likewise. * new-malloc/mallocbug.c: Likewise. * new-malloc/obstack.c: Likewise. * new-malloc/obstack.h: Likewise. * new-malloc/thread-m.h: Likewise. * time/Makefile: Compile ap.c with NO_MCHECK flag for now. * time/ap.c: Don't call mcheck if NO_MCHECK is defined. * resolv/Makefile: Add rule to rebuiild libresolv.so when libc.so changed. * stdio/feof.c: Update copyright. * stdio/stdio.h: Add field for lock to FILE structure. Add cast to *MAGIC constants to prevent warnings. * stdio-common/bug7.c: Correct test. Stream must not be closed twice. * stdlib/Makefile (routines): Add secure-getenv. * stdlib/secure-getenv.c: New file. __secure_getenv function moved to here from sysdeps/generic/getenv.c. Otherwise an application cannot replace the getenv function in the libc. * sysdeps/generic/getenv.c: Remove __secure_getenv function. * sysdeps/stub/getenv.c: Remove __secure_getenv alias. * sysdeps/mach/libc-lock.h: Define__libc_mutex_lock to __mutex_lock. * sysdeps/posix/fdopen.c: Update copyright. Don't use EXFUN. * time/test-tz.c: Comment fifth test out. PROBLEM. * time/tzset.c: De-ANSI-declfy. (__tzset): Don't increment pointer tz when no DST information is given. Sat Dec 7 23:47:54 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/mach/libc-lock.h [_LIBC]: Add definition of __libc_mutex_lock. Patch by Thomas Bushnell. * sysdeps/unix/sysv/linux/timebits.h: Load <asm/param.h> only if __USE_MISC. * sysdeps/unix/sysv/linux/Dist: Add llseek.c. Sat Dec 7 12:18:56 1996 Ulrich Drepper <drepper@cygnus.com> * time/strftime (%c format): Remove %Z from default string. Reported by Paul Eggert * io/getwd.c: Don't apply getcwd on user supplied buffer.
1996-12-08 08:01:13 +00:00
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.
1995-02-18 01:27:10 +00:00
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
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#include <endian.h>
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#include <errno.h>
#include <stdint.h>
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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* Return the value of the environment variable NAME. This implementation
is tuned a bit in that it assumes no environment variable has an empty
name which of course should always be true. We have a special case for
one character names so that for the general case we can assume at least
two characters which we can access. By doing this we can avoid using the
`strncmp' most of the time. */
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char *
update from main archive 960927 Sat Sep 28 03:02:49 1996 Ulrich Drepper <drepper@cygnus.com> * dirent/Makefile (routines): Add readdir_r. * dirent/readdir_r.c: New file. Wrapper around readdir.c. * dirent/dirent.h: Add prototype for readdir_r. * misc/hsearch_r.c (ENTRY): Make field `used' of type `unsigned int' to prevent warnings. * sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path): Initialize `result'. Sat Sep 28 01:16:42 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/generic/strsep.c: Rename to __strsep and make strsep weak alias. * string/string.h: Add prototype for __strsep. * misc/mntent_r.c: Use __strsep instead of strsep to keep namespace clean. * sysdeps/stub/nanosleep.c: Rename to __libc_nanosleep and make __nanosleep and nanosleep weak aliases. * sysdeps/unix/sysv/linux/syscalls.list: Add __nanosleep as weak alias. * sysdeps/unix/sysv/linux/sleep.c: Call __nanosleep instead of nanosleep to keep namespace clean. * sysdeps/posix/ttyname.c (ttyname): Add cast to prevent warning. * sysdeps/posix/ttyname_r.c (ttyname_r): Likewise. * sysdeps/posix/getcwd.c (__getcwd): Likewise. * sysdeps/unix/nlist.c: Use ISO C definition since we don't always have prototype. * login/Makefile (headers): Add pty.h. * login/pty.h: New file. * sysdeps/generic/pty.h: Include <pty.h>. * login/pututline_r.c: Add cast to prevent warning. * gmon/gmon.c: Add prototype for __profile_frequency. (monstartup): Add cast to prevent warning. * sysdeps/generic/prof-freq.c: Change to use ISO C style definition. * locale/programs/ld-time.c (time_output): Write `era' information in correct order. Sat Sep 28 00:11:08 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/syscalls.list: Add weak alias `adjtimex'. Set caller for mlock, mlockall, mremap, munlock, and munlockall to EXTRA. Reported by Matthias Urlichs <smurf@smurf.noris.de>. 1996-09-27 Paul Eggert <eggert@twinsun.com> * strftime.c (strftime): Output incomplete formats like %E at end of string. 1996-09-27 Paul Eggert <eggert@twinsun.com> * strftime.c (strftime): Add support for %EC and %Ey. Fix support for %EY. This uses the new _nl_get_era_entry function. Fri Sep 27 14:12:27 1996 Ulrich Drepper <drepper@cygnus.com> Security related patch by Elliot Lee <sopwith@redhat.com> and David Holland <dholland@eecs.harvard.edu>. * inet/rexec.c (rexec): Increase size of `num' array from 8 to 32. * inet/ruserpass.c (ruserpass): Don't allow $HOME envvar to not exist. * sysdeps/generic/getenv.c (__secure_getenv): New function. Return NULL when programs runs with SUID or SGID enabled. * sysdeps/stub/getenv.c: Make __secure_getenv an alias of getenv. * stdlib/stdlib.h: Add prototype for __secure_getenv. * locale/setlocale.c: Use __secure_getenv. * resolv/res_init.c: Likewise. * resolv/res_query.c: Likewise. * inet/ruserpass.c: Likewise. * sysdeps/posix/tempname.c: Likewise. * malloc/mtrace.c: Likewise. * catgets/catgets.c: Likewise. Make temporary file handling functions reentrant. * stdio-common/tmpnam.c: Rewrite to have own buffer to write result to. The called __stdio_gen_tempname function must be thread safe. * stdio-common/tmpnam_r.c: New file. * stdio/stdio.h: Add prototype for `tmpnam_r'. Change prototype for __stdio_gen_tempname. * stdio/libio.h: Likewise. * sysdeps/posix/tempname.c: Add new parameters and use them instead of static buffer. Don't reset `indeces' when PID changed between calls. Don't fail for long running programs when index counter once reached the limit. * sysdeps/stub/tempname.c: Likewise. * stdio-common/tempnam.c: Provide local buffer as extra argument to __stdio_gen_tempname. This makes this function reentrant. * stdio-common/tmpfile.c: Likewise. * stdio-common/temptest.c: Provide extra argument to __stdio_gen_tempname. * manual/filesys.texi: Describe tmpnam_r and add comments about reentrancy of the functions. * inet/rcmd.c: Fixed address length handling. * sysdeps/posix/mk-stdiolim.c: Count final \0 byte in L_tmpnam value. * time/strftime.c: Remove unused variables alt_digits and end_alt_digits. * sysdeps/unix/sysv/linux/sys/sysinfo.h: Correct prototype names for get_nprocs and get_nprocs_conf. * sysdeps/generic/sys/sysinfo.h: Likewise. * stdlib/test-canon.c: Finally do the right fix. * misc/Makefile: Only compile force-wrapper when compiling reentrant libc.
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getenv (name)
const char *name;
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{
size_t len = strlen (name);
update from main archive 960927 Sat Sep 28 03:02:49 1996 Ulrich Drepper <drepper@cygnus.com> * dirent/Makefile (routines): Add readdir_r. * dirent/readdir_r.c: New file. Wrapper around readdir.c. * dirent/dirent.h: Add prototype for readdir_r. * misc/hsearch_r.c (ENTRY): Make field `used' of type `unsigned int' to prevent warnings. * sysdeps/unix/sysv/linux/getsysstats.c (get_proc_path): Initialize `result'. Sat Sep 28 01:16:42 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/generic/strsep.c: Rename to __strsep and make strsep weak alias. * string/string.h: Add prototype for __strsep. * misc/mntent_r.c: Use __strsep instead of strsep to keep namespace clean. * sysdeps/stub/nanosleep.c: Rename to __libc_nanosleep and make __nanosleep and nanosleep weak aliases. * sysdeps/unix/sysv/linux/syscalls.list: Add __nanosleep as weak alias. * sysdeps/unix/sysv/linux/sleep.c: Call __nanosleep instead of nanosleep to keep namespace clean. * sysdeps/posix/ttyname.c (ttyname): Add cast to prevent warning. * sysdeps/posix/ttyname_r.c (ttyname_r): Likewise. * sysdeps/posix/getcwd.c (__getcwd): Likewise. * sysdeps/unix/nlist.c: Use ISO C definition since we don't always have prototype. * login/Makefile (headers): Add pty.h. * login/pty.h: New file. * sysdeps/generic/pty.h: Include <pty.h>. * login/pututline_r.c: Add cast to prevent warning. * gmon/gmon.c: Add prototype for __profile_frequency. (monstartup): Add cast to prevent warning. * sysdeps/generic/prof-freq.c: Change to use ISO C style definition. * locale/programs/ld-time.c (time_output): Write `era' information in correct order. Sat Sep 28 00:11:08 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/syscalls.list: Add weak alias `adjtimex'. Set caller for mlock, mlockall, mremap, munlock, and munlockall to EXTRA. Reported by Matthias Urlichs <smurf@smurf.noris.de>. 1996-09-27 Paul Eggert <eggert@twinsun.com> * strftime.c (strftime): Output incomplete formats like %E at end of string. 1996-09-27 Paul Eggert <eggert@twinsun.com> * strftime.c (strftime): Add support for %EC and %Ey. Fix support for %EY. This uses the new _nl_get_era_entry function. Fri Sep 27 14:12:27 1996 Ulrich Drepper <drepper@cygnus.com> Security related patch by Elliot Lee <sopwith@redhat.com> and David Holland <dholland@eecs.harvard.edu>. * inet/rexec.c (rexec): Increase size of `num' array from 8 to 32. * inet/ruserpass.c (ruserpass): Don't allow $HOME envvar to not exist. * sysdeps/generic/getenv.c (__secure_getenv): New function. Return NULL when programs runs with SUID or SGID enabled. * sysdeps/stub/getenv.c: Make __secure_getenv an alias of getenv. * stdlib/stdlib.h: Add prototype for __secure_getenv. * locale/setlocale.c: Use __secure_getenv. * resolv/res_init.c: Likewise. * resolv/res_query.c: Likewise. * inet/ruserpass.c: Likewise. * sysdeps/posix/tempname.c: Likewise. * malloc/mtrace.c: Likewise. * catgets/catgets.c: Likewise. Make temporary file handling functions reentrant. * stdio-common/tmpnam.c: Rewrite to have own buffer to write result to. The called __stdio_gen_tempname function must be thread safe. * stdio-common/tmpnam_r.c: New file. * stdio/stdio.h: Add prototype for `tmpnam_r'. Change prototype for __stdio_gen_tempname. * stdio/libio.h: Likewise. * sysdeps/posix/tempname.c: Add new parameters and use them instead of static buffer. Don't reset `indeces' when PID changed between calls. Don't fail for long running programs when index counter once reached the limit. * sysdeps/stub/tempname.c: Likewise. * stdio-common/tempnam.c: Provide local buffer as extra argument to __stdio_gen_tempname. This makes this function reentrant. * stdio-common/tmpfile.c: Likewise. * stdio-common/temptest.c: Provide extra argument to __stdio_gen_tempname. * manual/filesys.texi: Describe tmpnam_r and add comments about reentrancy of the functions. * inet/rcmd.c: Fixed address length handling. * sysdeps/posix/mk-stdiolim.c: Count final \0 byte in L_tmpnam value. * time/strftime.c: Remove unused variables alt_digits and end_alt_digits. * sysdeps/unix/sysv/linux/sys/sysinfo.h: Correct prototype names for get_nprocs and get_nprocs_conf. * sysdeps/generic/sys/sysinfo.h: Likewise. * stdlib/test-canon.c: Finally do the right fix. * misc/Makefile: Only compile force-wrapper when compiling reentrant libc.
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char **ep;
uint16_t name_start;
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if (__environ == NULL || name[0] == '\0')
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return NULL;
if (name[1] == '\0')
{
/* The name of the variable consists of only one character. Therefore
the first two characters of the environment entry are this character
and a '=' character. */
#if __BYTE_ORDER == __LITTLE_ENDIAN || !_STRING_ARCH_unaligned
name_start = ('=' << 8) | *(const unsigned char *) name;
#else
# if __BYTE_ORDER == __BIG_ENDIAN
name_start = '=' | ((*(const unsigned char *) name) << 8);
# else
#error "Funny byte order."
# endif
#endif
for (ep = __environ; *ep != NULL; ++ep)
{
#if _STRING_ARCH_unaligned
uint16_t ep_start = *(uint16_t *) *ep;
#else
uint16_t ep_start = (((unsigned char *) *ep)[0]
| (((unsigned char *) *ep)[1] << 8));
#endif
if (name_start == ep_start)
return &(*ep)[2];
}
}
else
{
#if _STRING_ARCH_unaligned
name_start = *(const uint16_t *) name;
#else
name_start = (((const unsigned char *) name)[0]
| (((const unsigned char *) name)[1] << 8));
#endif
len -= 2;
name += 2;
for (ep = __environ; *ep != NULL; ++ep)
{
#if _STRING_ARCH_unaligned
uint16_t ep_start = *(uint16_t *) *ep;
#else
uint16_t ep_start = (((unsigned char *) *ep)[0]
| (((unsigned char *) *ep)[1] << 8));
#endif
if (name_start == ep_start && !strncmp (*ep + 2, name, len)
&& (*ep)[len + 2] == '=')
return &(*ep)[len + 3];
}
}
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return NULL;
}
libc_hidden_def (getenv)