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.\" @(#)atol.3 8.1 (Berkeley) 6/4/93 33.\" 34.Dd May 14, 2013 35.Dt ATOL 3 36.Os 37.Sh NAME 38.Nm atol , atoll 39.Nd convert 40.Tn ASCII 41string to 42.Vt long 43or 44.Vt "long long" 45integer 46.Sh LIBRARY 47.Lb libc 48.Sh SYNOPSIS 49.In stdlib.h 50.Ft long 51.Fn atol "const char *nptr" 52.Ft "long long" 53.Fn atoll "const char *nptr" 54.Sh DESCRIPTION 55The 56.Fn atol 57function converts the initial portion of the string pointed to by 58.Fa nptr 59to 60.Vt long 61integer 62representation. 63.Pp 64It is equivalent to: 65.Pp 66.Dl "strtol(nptr, (char **)NULL, 10);" 67.Pp 68The 69.Fn atoll 70function converts the initial portion of the string pointed to by 71.Fa nptr 72to 73.Vt "long long" 74integer 75representation. 76.Pp 77It is equivalent to: 78.Pp 79.Dl "strtoll(nptr, (char **)NULL, 10);" 80.Sh COMPATIBILITY 81The 82.Fx 83implementations of the 84.Fn atol 85and 86.Fn atoll 87functions are thin wrappers around 88.Fn strtol 89and 90.Fn strtoll 91respectively, so these functions will affect the value of 92.Va errno 93in the same way that the 94.Fn strtol 95and 96.Fn strtoll 97functions are able to. 98This behavior of 99.Fn atol 100and 101.Fn atoll 102is not required by 103.St -isoC 104or 105.St -isoC-99 , 106but it is allowed by all of 107.St -isoC , St -isoC-99 108and 109.St -p1003.1-2001 . 110.Sh ERRORS 111The functions 112.Fn atol 113and 114.Fn atoll 115may affect the value of 116.Va errno 117on an error. 118.Sh SEE ALSO 119.Xr atof 3 , 120.Xr atoi 3 , 121.Xr strtod 3 , 122.Xr strtol 3 , 123.Xr strtoul 3 124.Sh STANDARDS 125The 126.Fn atol 127function 128conforms to 129.St -isoC . 130The 131.Fn atoll 132function 133conforms to 134.St -isoC-99 . 135