freebsd-dev/lib/libc/stdlib/atoi.3
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.\" Copyright (c) 1990, 1991, 1993
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.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
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.\" @(#)atoi.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.Dt ATOI 3
.Os
.Sh NAME
.Nm atoi
.Nd convert
.Tn ASCII
string to integer
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.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
to
.Vt int
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
.Fn atoi
function has been deprecated by
.Fn strtol
and should not be used in new code.
.Sh ERRORS
The function
.Fn atoi
need not affect the value of
.Va errno
on an error.
.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 .