1MEMCHR(3P)                 POSIX Programmer's Manual                MEMCHR(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       memchr — find byte in memory
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SYNOPSIS

15       #include <string.h>
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17       void *memchr(const void *s, int c, size_t n);
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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 memchr() function shall locate the first occurrence of c (converted
26       to an unsigned char) in  the  initial  n  bytes  (each  interpreted  as
27       unsigned char) pointed to by s.
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29       Implementations  shall  behave  as if they read the memory byte by byte
30       from the beginning of the bytes pointed to by s and stop at  the  first
31       occurrence of c (if it is found in the initial n bytes).
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RETURN VALUE

34       The  memchr() function shall return a pointer to the located byte, or a
35       null pointer if the byte is not found.
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ERRORS

38       No errors are defined.
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40       The following sections are informative.
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EXAMPLES

43       None.
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APPLICATION USAGE

46       None.
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RATIONALE

49       None.
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FUTURE DIRECTIONS

52       None.
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SEE ALSO

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