freebsd-dev/lib/libc/stdlib/atoi.3

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.\" Copyright (c) 1990, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" @(#)atoi.3 8.1 (Berkeley) 6/4/93
1999-08-28 00:22:10 +00:00
.\" $FreeBSD$
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.\"
.Dd June 4, 1993
.Dt ATOI 3
.Os
.Sh NAME
.Nm atoi
.Nd convert
.Tn ASCII
string to integer
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In stdlib.h
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.Ft int
.Fn atoi "const char *nptr"
.Sh DESCRIPTION
The
.Fn atoi
function converts the initial portion of the string pointed to by
.Fa nptr
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to
.Vt int
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representation.
.Pp
It is equivalent to:
.Bd -literal -offset indent
(int)strtol(nptr, (char **)NULL, 10);
.Ed
.Sh IMPLEMENTATION NOTES
The
.Fn atoi
function is not thread-safe and also not async-cancel safe.
.Pp
The
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.Fn atoi
function has been deprecated by
.Fn strtol
and should not be used in new code.
.Sh ERRORS
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The function
.Fn atoi
need not affect the value of
.Va errno
on an error.
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.Sh SEE ALSO
.Xr atof 3 ,
.Xr atol 3 ,
.Xr strtod 3 ,
.Xr strtol 3 ,
.Xr strtoul 3
.Sh STANDARDS
The
.Fn atoi
function conforms to
.St -p1003.1-90 ,
.St -isoC ,
and
.St -isoC-99 .