atol

ATOL(3POSIX)                POSIX Programmer's Manual               ATOL(3POSIX)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the corresponding
       Linux manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.


NAME
       atol, atoll — convert a string to a long integer

SYNOPSIS
       #include <stdlib.h>

       long atol(const char *str);
       long long atoll(const char *nptr);

DESCRIPTION
       The functionality described on this reference page is aligned with the
       ISO C standard. Any conflict between the requirements described here and
       the ISO C standard is unintentional. This volume of POSIX.1‐2008 defers
       to the ISO C standard.

       The call atol(str) shall be equivalent to:

           strtol(str, (char **)NULL, 10)

       The call atoll(nptr) shall be equivalent to:

           strtoll(nptr, (char **)NULL, 10)

       except that the handling of errors may differ. If the value cannot be
       represented, the behavior is undefined.

RETURN VALUE
       These functions shall return the converted value if the value can be
       represented.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The atol() function is subsumed by strtol() but is retained because it is
       used extensively in existing code. If the number is not known to be in
       range, strtol() should be used because atol() is not required to perform
       any error checking.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       strtol()

       The Base Definitions volume of POSIX.1‐2008, <stdlib.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical
       and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008
       with the 2013 Technical Corrigendum 1 applied.) In the event of any
       discrepancy between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee
       document. The original Standard can be obtained online at
       http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most
       likely to have been introduced during the conversion of the source files
       to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                   2013                          ATOL(3POSIX)