2004-11-03 13:51:07 +00:00
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.\" Copyright 2002 walter harms (walter.harms@informatik.uni-oldenburg.de)
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.\" Distributed under GPL
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.\"
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.\" Corrected, aeb, 2002-05-30
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.\"
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_exit.2, brk.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, getdtablesize.2, gethostname.2, getpagesize.2, getsid.2, killpg.2, mknod.2, mknodat.2, poll.2, posix_fadvise.2, pread.2, readlink.2, setpgid.2, setreuid.2, sigaltstack.2, stat.2, symlink.2, sync.2, truncate.2, vfork.2, wait.2, wait4.2, a64l.3, abs.3, acos.3, acosh.3, asin.3, asinh.3, atan.3, atan2.3, atoi.3, cbrt.3, ceil.3, copysign.3, cosh.3, dirfd.3, div.3, ecvt.3, erf.3, erfc.3, exp.3, exp2.3, fabs.3, fdim.3, ffs.3, floor.3, fma.3, fmax.3, fmin.3, fmod.3, fpclassify.3, frexp.3, ftw.3, fwide.3, gcvt.3, getcwd.3, getdate.3, getgrent.3, gethostid.3, getpass.3, getpwent.3, getsubopt.3, getw.3, hypot.3, ilogb.3, index.3, isalpha.3, isgreater.3, iswblank.3, j0.3, ldexp.3, lockf.3, log.3, log10.3, log1p.3, logb.3, lrint.3, lround.3, mkstemp.3, mktemp.3, modf.3, mq_receive.3, mq_send.3, nan.3, nextafter.3, posix_fallocate.3, posix_memalign.3, printf.3, qecvt.3, random.3, realpath.3, remainder.3, remquo.3, rint.3, round.3, scalb.3, scalbln.3, scanf.3, siginterrupt.3, signbit.3, sigset.3, sinh.3, sqrt.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strfry.3, strpbrk.3, strsep.3, strspn.3, strstr.3, strtod.3, strtok.3, strtol.3, strtoul.3, strxfrm.3, tanh.3, tgamma.3, trunc.3, ttyslot.3, ualarm.3, usleep.3, wprintf.3, armscii-8.7, cp1251.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-3.7, iso_8859-5.7, iso_8859-6.7, iso_8859-8.7, koi8-u.7: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-19 17:19:13 +00:00
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.TH A64L 3 2010-09-20 "" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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2007-04-12 22:42:49 +00:00
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a64l, l64a \- convert between long and base-64
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2004-11-03 13:51:07 +00:00
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.SH SYNOPSIS
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.B #include <stdlib.h>
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.sp
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.BI "long a64l(char *" str64 );
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.sp
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.BI "char *l64a(long " value );
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2007-07-08 12:11:40 +00:00
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR a64l (),
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.BR l64a ():
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2010-09-18 07:48:42 +00:00
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.br
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.RS 4
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.ad l
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_SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
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_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
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.RE
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.ad
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2004-11-03 13:51:07 +00:00
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.SH DESCRIPTION
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These functions provide a conversion between 32-bit long integers
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and little-endian base-64 ASCII strings (of length zero to six).
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If the string used as argument for
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.BR a64l ()
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has length greater than six, only the first six bytes are used.
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2007-06-25 10:03:10 +00:00
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If the type
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.I long
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has more than 32 bits, then
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2004-11-03 13:51:07 +00:00
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.BR l64a ()
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uses only the low order 32 bits of
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.IR value ,
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and
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.BR a64l ()
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sign-extends its 32-bit result.
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.LP
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2007-12-23 21:48:05 +00:00
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The 64 digits in the base-64 system are:
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2004-11-03 13:51:07 +00:00
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.RS
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.nf
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2007-04-05 12:36:57 +00:00
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2008-06-09 15:49:35 +00:00
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\&\(aq.\(aq represents a 0
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\&\(aq/\(aq represents a 1
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2004-11-03 13:51:07 +00:00
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0-9 represent 2-11
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A-Z represent 12-37
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a-z represent 38-63
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2007-04-05 12:36:57 +00:00
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2004-11-03 13:51:07 +00:00
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.fi
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.RE
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So 123 = 59*64^0 + 1*64^1 = "v/".
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2007-05-19 04:30:20 +00:00
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.SH "CONFORMING TO"
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POSIX.1-2001.
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2004-11-03 13:51:07 +00:00
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.SH NOTES
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The value returned by
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2010-08-29 06:20:19 +00:00
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.BR l64a ()
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2004-11-03 13:51:07 +00:00
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may be a pointer to a static buffer, possibly overwritten
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by later calls.
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.LP
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2007-06-08 09:56:56 +00:00
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The behavior of
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2004-11-03 13:51:07 +00:00
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.BR l64a ()
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is undefined when
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.I value
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2007-04-12 22:42:49 +00:00
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is negative.
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If
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2004-11-03 13:51:07 +00:00
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.I value
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is zero, it returns an empty string.
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.LP
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These functions are broken in glibc before 2.2.5
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(puts most significant digit first).
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.LP
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This is not the encoding used by
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.BR uuencode (1).
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.SH "SEE ALSO"
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.BR uuencode (1),
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2007-06-02 12:57:48 +00:00
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.\" .BR itoa (3),
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2004-11-03 13:51:07 +00:00
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.BR strtoul (3)
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