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strlen
Section: C Library Functions (3) Updated: 2026-02-08 Index
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NAME
strlen - calculate the length of a string
LIBRARY
Standard C library
( libc,~ -lc)
SYNOPSIS
#include <string.h>
size_t strlen(const char *s);
DESCRIPTION
The
strlen()
function calculates the length of the string pointed to by
s,
excluding the terminating null byte ([aq][rs]0[aq]).
RETURN VALUE
The
strlen()
function returns the number of bytes in the string pointed to by
s.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
strlen()
| Thread safety | MT-Safe
|
STANDARDS
C11, POSIX.1-2008.
HISTORY
POSIX.1-2001, C89, SVr4, 4.3BSD.
NOTES
In cases where the input buffer may not contain
a terminating null byte,
strnlen(3)
should be used instead.
SEE ALSO
string(3),
strnlen(3),
wcslen(3),
wcsnlen(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- NOTES
-
- SEE ALSO
-
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