1STRLEN(3)                  Linux Programmer's Manual                 STRLEN(3)
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NAME

6       strlen - calculate the length of a string
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SYNOPSIS

9       #include <string.h>
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11       size_t strlen(const char *s);
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DESCRIPTION

14       The strlen() function calculates the length of the string pointed to by
15       s, excluding the terminating null byte ('\0').
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RETURN VALUE

18       The strlen() function returns the number of bytes in the string pointed
19       to by s.
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ATTRIBUTES

22       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
23       tributes(7).
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25       ┌────────────────────────────────────────────┬───────────────┬─────────┐
26       │Interface                                   │ Attribute     │ Value   │
27       ├────────────────────────────────────────────┼───────────────┼─────────┤
28       │strlen()                                    │ Thread safety │ MT-Safe │
29       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

32       POSIX.1-2001, POSIX.1-2008, C89, C99, C11, SVr4, 4.3BSD.
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NOTES

35       In cases where the input buffer may  not  contain  a  terminating  null
36       byte, strnlen(3) should be used instead.
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SEE ALSO

39       string(3), strnlen(3), wcslen(3), wcsnlen(3)
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COLOPHON

42       This  page  is  part of release 5.13 of the Linux man-pages project.  A
43       description of the project, information about reporting bugs,  and  the
44       latest     version     of     this    page,    can    be    found    at
45       https://www.kernel.org/doc/man-pages/.
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49GNU                               2021-08-27                         STRLEN(3)
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