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.Dd April 1, 2020 33.Dt ATOI 3 34.Os 35.Sh NAME 36.Nm atoi 37.Nd convert 38.Tn ASCII 39string to integer 40.Sh LIBRARY 41.Lb libc 42.Sh SYNOPSIS 43.In stdlib.h 44.Ft int 45.Fn atoi "const char *nptr" 46.Sh DESCRIPTION 47The 48.Fn atoi 49function converts the initial portion of the string pointed to by 50.Fa nptr 51to 52.Vt int 53representation. 54.Pp 55It is equivalent to: 56.Bd -literal -offset indent 57(int)strtol(nptr, NULL, 10); 58.Ed 59.Pp 60The 61.Fn atoi 62function has been deprecated by 63.Fn strtol 64and should not be used in new code. 65.Sh ERRORS 66The function 67.Fn atoi 68need not affect the value of 69.Va errno 70on an error. 71.Sh SEE ALSO 72.Xr atof 3 , 73.Xr atol 3 , 74.Xr strtod 3 , 75.Xr strtol 3 , 76.Xr strtoul 3 77.Sh STANDARDS 78The 79.Fn atoi 80function conforms to 81.St -p1003.1-90 , 82.St -isoC , 83and 84.St -isoC-99 . 85.Sh HISTORY 86The 87.Fn atoi 88function appeared in 89.At v1 . 90