1ATOL(3P)                   POSIX Programmer's Manual                  ATOL(3P)
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PROLOG

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

12       atol, atoll — convert a string to a long integer
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SYNOPSIS

15       #include <stdlib.h>
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17       long atol(const char *nptr);
18       long long atoll(const char *nptr);
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DESCRIPTION

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
24       defers to the ISO C standard.
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26       Except as noted below, the call atol(nptr) shall be equivalent to:
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29           strtol(nptr, (char **)NULL, 10)
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31       Except as noted below, the call to atoll(nptr) shall be equivalent to:
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34           strtoll(nptr, (char **)NULL, 10)
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36       The  handling of errors may differ. If the value cannot be represented,
37       the behavior is undefined.
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RETURN VALUE

40       These functions shall return the converted value if the  value  can  be
41       represented.
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ERRORS

44       No errors are defined.
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46       The following sections are informative.
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EXAMPLES

49       None.
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APPLICATION USAGE

52       If the number is not known to be in range, strtol() or strtoll() should
53       be used because atol() and atoll() are  not  required  to  perform  any
54       error checking.
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RATIONALE

57       None.
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FUTURE DIRECTIONS

60       None.
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SEE ALSO

63       strtol()
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65       The Base Definitions volume of POSIX.1‐2017, <stdlib.h>
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68       Portions  of  this text are reprinted and reproduced in electronic form
69       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
70       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
71       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
72       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
73       event of any discrepancy between this version and the original IEEE and
74       The  Open Group Standard, the original IEEE and The Open Group Standard
75       is the referee document. The original Standard can be  obtained  online
76       at http://www.opengroup.org/unix/online.html .
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78       Any  typographical  or  formatting  errors that appear in this page are
79       most likely to have been introduced during the conversion of the source
80       files  to  man page format. To report such errors, see https://www.ker‐
81       nel.org/doc/man-pages/reporting_bugs.html .
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85IEEE/The Open Group                  2017                             ATOL(3P)
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