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.\" $FreeBSD$ 34.\" 35.Dd May 14, 2013 36.Dt ATOL 3 37.Os 38.Sh NAME 39.Nm atol , atoll 40.Nd convert 41.Tn ASCII 42string to 43.Vt long 44or 45.Vt "long long" 46integer 47.Sh LIBRARY 48.Lb libc 49.Sh SYNOPSIS 50.In stdlib.h 51.Ft long 52.Fn atol "const char *nptr" 53.Ft "long long" 54.Fn atoll "const char *nptr" 55.Sh DESCRIPTION 56The 57.Fn atol 58function converts the initial portion of the string pointed to by 59.Fa nptr 60to 61.Vt long 62integer 63representation. 64.Pp 65It is equivalent to: 66.Pp 67.Dl "strtol(nptr, (char **)NULL, 10);" 68.Pp 69The 70.Fn atoll 71function converts the initial portion of the string pointed to by 72.Fa nptr 73to 74.Vt "long long" 75integer 76representation. 77.Pp 78It is equivalent to: 79.Pp 80.Dl "strtoll(nptr, (char **)NULL, 10);" 81.Sh COMPATIBILITY 82The 83.Fx 84implementations of the 85.Fn atol 86and 87.Fn atoll 88functions are thin wrappers around 89.Fn strtol 90and 91.Fn strtoll 92respectively, so these functions will affect the value of 93.Va errno 94in the same way that the 95.Fn strtol 96and 97.Fn strtoll 98functions are able to. 99This behavior of 100.Fn atol 101and 102.Fn atoll 103is not required by 104.St -isoC 105or 106.St -isoC-99 , 107but it is allowed by all of 108.St -isoC , St -isoC-99 109and 110.St -p1003.1-2001 . 111.Sh ERRORS 112The functions 113.Fn atol 114and 115.Fn atoll 116may affect the value of 117.Va errno 118on an error. 119.Sh SEE ALSO 120.Xr atof 3 , 121.Xr atoi 3 , 122.Xr strtod 3 , 123.Xr strtol 3 , 124.Xr strtoul 3 125.Sh STANDARDS 126The 127.Fn atol 128function 129conforms to 130.St -isoC . 131The 132.Fn atoll 133function 134conforms to 135.St -isoC-99 . 136