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

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

16       #include <stdlib.h>
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18       long atol(const char *str);
19       long long atoll(const char *nptr);
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DESCRIPTION

22       The functionality described on this reference page is aligned with  the
23       ISO C  standard.  Any  conflict between the requirements described here
24       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
25       defers to the ISO C standard.
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27       The call atol(str) shall be equivalent to:
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29           strtol(str, (char **)NULL, 10)
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31       The call atoll(nptr) shall be equivalent to:
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33           strtoll(nptr, (char **)NULL, 10)
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35       except  that  the handling of errors may differ. If the value cannot be
36       represented, the behavior is undefined.
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RETURN VALUE

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

43       No errors are defined.
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45       The following sections are informative.
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EXAMPLES

48       None.
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APPLICATION USAGE

51       The  atol() function is subsumed by strtol() but is retained because it
52       is used extensively in existing code. If the number is not known to  be
53       in  range,  strtol()  should  be used because atol() is not required to
54       perform any 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.1‐2008, <stdlib.h>
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68       Portions of this text are reprinted and reproduced in  electronic  form
69       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
70       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
71       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
72       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
73       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
74       event of any discrepancy between this version and the original IEEE and
75       The  Open Group Standard, the original IEEE and The Open Group Standard
76       is the referee document. The original Standard can be  obtained  online
77       at http://www.unix.org/online.html .
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79       Any  typographical  or  formatting  errors that appear in this page are
80       most likely to have been introduced during the conversion of the source
81       files  to  man page format. To report such errors, see https://www.ker‐
82       nel.org/doc/man-pages/reporting_bugs.html .
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86IEEE/The Open Group                  2013                             ATOL(3P)
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