1STRSPN(3P)                 POSIX Programmer's Manual                STRSPN(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       strspn — get length of a substring
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SYNOPSIS

15       #include <string.h>
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17       size_t strspn(const char *s1, const char *s2);
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DESCRIPTION

20       The functionality described on this reference page is aligned with  the
21       ISO C  standard.  Any  conflict between the requirements described here
22       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
23       defers to the ISO C standard.
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25       The  strspn() function shall compute the length (in bytes) of the maxi‐
26       mum initial segment of the string  pointed  to  by  s1  which  consists
27       entirely of bytes from the string pointed to by s2.
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RETURN VALUE

30       The strspn() function shall return the computed length; no return value
31       is reserved to indicate an error.
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ERRORS

34       No errors are defined.
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36       The following sections are informative.
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EXAMPLES

39       None.
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APPLICATION USAGE

42       None.
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RATIONALE

45       None.
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FUTURE DIRECTIONS

48       None.
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SEE ALSO

51       strcspn()
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53       The Base Definitions volume of POSIX.1‐2017, <string.h>
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56       Portions of this text are reprinted and reproduced in  electronic  form
57       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
58       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
59       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
60       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
61       event of any discrepancy between this version and the original IEEE and
62       The Open Group Standard, the original IEEE and The Open Group  Standard
63       is  the  referee document. The original Standard can be obtained online
64       at http://www.opengroup.org/unix/online.html .
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66       Any typographical or formatting errors that appear  in  this  page  are
67       most likely to have been introduced during the conversion of the source
68       files to man page format. To report such errors,  see  https://www.ker‐
69       nel.org/doc/man-pages/reporting_bugs.html .
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73IEEE/The Open Group                  2017                           STRSPN(3P)
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