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x SuSE Linux 13.1-RELEASEx
ATOI(3) Linux Programmer's Manual ATOI(3)
NAME
atoi, atol, atoll, atoq - convert a string to an integer
SYNOPSIS
#include <stdlib.h>
int atoi(const char *nptr);
long atol(const char *nptr);
long long atoll(const char *nptr);
long long atoq(const char *nptr);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
atoll():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
DESCRIPTION
The atoi() function converts the initial portion of the string pointed
to by nptr to int. The behavior is the same as
strtol(nptr, NULL, 10);
except that atoi() does not detect errors.
The atol() and atoll() functions behave the same as atoi(), except that
they convert the initial portion of the string to their return type of
long or long long. atoq() is an obsolete name for atoll().
RETURN VALUE
The converted value.
ATTRIBUTES
Multithreading (see pthreads(7))
The atoi(), atol(), and atoll() functions are thread-safe with excep-
tions. These functions can be safely used in multithreaded applica-
tions, as long as setlocale(3) is not called to change the locale dur-
ing their execution.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and POSIX.1-1996 include the
functions atoi() and atol() only. atoq() is a GNU extension.
NOTES
The nonstandard atoq() function is not present in libc 4.6.27 or glibc
2, but is present in libc5 and libc 4.7 (though only as an inline func-
tion in <stdlib.h> until libc 5.4.44). The atoll() function is present
in glibc 2 since version 2.0.2, but not in libc4 or libc5.
SEE ALSO
atof(3), strtod(3), strtol(3), strtoul(3)
COLOPHON
This page is part of release 3.69 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
GNU 2014-01-22 ATOI(3)
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