1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)atoi.3 8.1 (Berkeley) 6/4/93 33.\" 34.Dd April 1, 2020 35.Dt ATOI 3 36.Os 37.Sh NAME 38.Nm atoi 39.Nd convert 40.Tn ASCII 41string to integer 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In stdlib.h 46.Ft int 47.Fn atoi "const char *nptr" 48.Sh DESCRIPTION 49The 50.Fn atoi 51function converts the initial portion of the string pointed to by 52.Fa nptr 53to 54.Vt int 55representation. 56.Pp 57It is equivalent to: 58.Bd -literal -offset indent 59(int)strtol(nptr, NULL, 10); 60.Ed 61.Pp 62The 63.Fn atoi 64function has been deprecated by 65.Fn strtol 66and should not be used in new code. 67.Sh ERRORS 68The function 69.Fn atoi 70need not affect the value of 71.Va errno 72on an error. 73.Sh SEE ALSO 74.Xr atof 3 , 75.Xr atol 3 , 76.Xr strtod 3 , 77.Xr strtol 3 , 78.Xr strtoul 3 79.Sh STANDARDS 80The 81.Fn atoi 82function conforms to 83.St -p1003.1-90 , 84.St -isoC , 85and 86.St -isoC-99 . 87.Sh HISTORY 88The 89.Fn atoi 90function appeared in 91.At v1 . 92