1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
3 .\" %%%LICENSE_START(VERBATIM)
4 .\" Permission is granted to make and distribute verbatim copies of this
5 .\" manual provided the copyright notice and this permission notice are
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8 .\" Permission is granted to copy and distribute modified versions of this
9 .\" manual under the conditions for verbatim copying, provided that the
10 .\" entire resulting derived work is distributed under the terms of a
11 .\" permission notice identical to this one.
13 .\" Since the Linux kernel and libraries are constantly changing, this
14 .\" manual page may be incorrect or out-of-date. The author(s) assume no
15 .\" responsibility for errors or omissions, or for damages resulting from
16 .\" the use of the information contained herein. The author(s) may not
17 .\" have taken the same level of care in the production of this manual,
18 .\" which is licensed free of charge, as they might when working
21 .\" Formatted or processed versions of this manual, if unaccompanied by
22 .\" the source, must acknowledge the copyright and authors of this work.
25 .\" References consulted:
26 .\" Linux libc source code
27 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
29 .\" Modified Mon Mar 29 22:39:41 1993, David Metcalfe
30 .\" Modified Sat Jul 24 21:38:42 1993, Rik Faith (faith@cs.unc.edu)
31 .\" Modified Sun Dec 17 18:35:06 2000, Joseph S. Myers
33 .TH ATOI 3 2014-08-19 "GNU" "Linux Programmer's Manual"
35 atoi, atol, atoll \- convert a string to an integer
38 .B #include <stdlib.h>
40 .BI "int atoi(const char *" nptr );
42 .BI "long atol(const char *" nptr );
44 .BI "long long atoll(const char *" nptr );
48 Feature Test Macro Requirements for glibc (see
49 .BR feature_test_macros (7)):
55 _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
56 _POSIX_C_SOURCE\ >=\ 200112L;
65 function converts the initial portion of the string
66 pointed to by \fInptr\fP to
68 The behavior is the same as
71 strtol(nptr, NULL, 10);
76 does not detect errors.
82 functions behave the same as
84 except that they convert the initial portion of the
85 string to their return type of \fIlong\fP or \fIlong long\fP.
89 .SS Multithreading (see pthreads(7))
95 functions are thread-safe with exceptions.
96 These functions can be safely used in multithreaded applications,
99 is not called to change the locale during their execution.
101 SVr4, POSIX.1-2001, 4.3BSD, C99.
103 POSIX.1-1996 include the functions
111 as an obsolete name for
114 is not provided by glibc.
117 .\" function is present in glibc 2 since version 2.0.2, but
118 .\" not in libc4 or libc5.