2004-11-03 13:51:07 +00:00
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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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2007-04-12 22:42:49 +00:00
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Mon Mar 29 22:39:41 1993, David Metcalfe
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.\" Modified Sat Jul 24 21:38:42 1993, Rik Faith (faith@cs.unc.edu)
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.\" Modified Sun Dec 17 18:35:06 2000, Joseph S. Myers
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.\"
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2012-08-03 06:10:17 +00:00
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.TH ATOI 3 2012-08-03 "GNU" "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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atoi, atol, atoll, atoq \- convert a string to an integer
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.SH SYNOPSIS
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.nf
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.B #include <stdlib.h>
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.sp
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.BI "int atoi(const char *" nptr );
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.br
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.BI "long atol(const char *" nptr );
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.br
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.BI "long long atoll(const char *" nptr );
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.br
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.BI "long long atoq(const char *" nptr );
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.fi
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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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.ad l
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.BR atoll ():
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2010-09-18 16:32:42 +00:00
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.RS 4
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2010-09-18 16:37:36 +00:00
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_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
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_POSIX_C_SOURCE\ >=\ 200112L;
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.br
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or
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.I cc\ -std=c99
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2010-09-18 16:32:42 +00:00
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.RE
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.ad
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.SH DESCRIPTION
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2007-05-12 09:06:04 +00:00
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The
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.BR atoi ()
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function converts the initial portion of the string
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pointed to by \fInptr\fP to
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.IR int .
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2007-06-08 09:56:56 +00:00
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The behavior is the same as
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2004-11-03 13:51:07 +00:00
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.sp
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2007-12-24 11:36:55 +00:00
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.in +4n
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2012-08-03 06:10:17 +00:00
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strtol(nptr, NULL, 10);
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2007-12-24 11:36:55 +00:00
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.in
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.sp
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2007-05-12 09:06:04 +00:00
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except that
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.BR atoi ()
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does not detect errors.
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.PP
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2007-05-12 09:06:04 +00:00
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The
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.BR atol ()
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and
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.BR atoll ()
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functions behave the same as
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.BR atoi (),
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except that they convert the initial portion of the
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2004-11-03 13:51:07 +00:00
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string to their return type of \fIlong\fP or \fIlong long\fP.
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2007-05-12 09:06:04 +00:00
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.BR atoq ()
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is an obsolete name for
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.BR atoll ().
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2004-11-03 13:51:07 +00:00
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.SH "RETURN VALUE"
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The converted value.
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.SH "CONFORMING TO"
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2007-04-12 22:42:49 +00:00
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SVr4, POSIX.1-2001, 4.3BSD, C99.
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2006-08-03 13:57:30 +00:00
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C89 and
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2007-05-12 09:06:04 +00:00
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POSIX.1-1996 include the functions
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.BR atoi ()
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and
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.BR atol ()
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only.
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2007-11-24 10:10:39 +00:00
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.BR atoq ()
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2006-08-03 13:57:30 +00:00
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is a GNU extension.
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2004-11-03 13:51:07 +00:00
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.SH NOTES
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accept.2, execve.2, futimesat.2, getresuid.2, getrlimit.2, madvise.2, mq_getsetattr.2, msgctl.2, nice.2, open.2, poll.2, setresuid.2, shmctl.2, sigaction.2, times.2, utimensat.2, __setfpucw.3, atoi.3, endian.3, err.3, euidaccess.3, fenv.3, fopencookie.3, fpurge.3, getgrouplist.3, getutmp.3, j0.3, lgamma.3, netlink.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_cleanup_push_defer_np.3, pthread_getattr_np.3, pthread_kill_other_threads_np.3, pthread_setaffinity_np.3, pthread_tryjoin_np.3, pthread_yield.3, random_r.3, readdir.3, rtnetlink.3, scanf.3, setenv.3, significand.3, sigsetops.3, strerror.3, strstr.3, sysv_signal.3, termios.3, timegm.3, unlocked_stdio.3, y0.3, locale.5, bootparam.7, feature_test_macros.7, ip.7, locale.7, pthreads.7, rtld-audit.7, nscd.8: Global fix: s/non-standard/nonstandard/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:37:52 +00:00
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The nonstandard
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2007-05-12 09:06:04 +00:00
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.BR atoq ()
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function is not present in libc 4.6.27
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2004-11-03 13:51:07 +00:00
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or glibc 2, but is present in libc5 and libc 4.7 (though only as an
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2007-06-20 21:53:34 +00:00
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inline function in \fI<stdlib.h>\fP until libc 5.4.44).
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2007-05-12 09:06:04 +00:00
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The
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.BR atoll ()
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function is present in glibc 2 since version 2.0.2, but
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2004-11-03 13:51:07 +00:00
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not in libc4 or libc5.
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.SH "SEE ALSO"
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.BR atof (3),
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.BR strtod (3),
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.BR strtol (3),
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.BR strtoul (3)
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