NAME
strlen — get
string length
SYNOPSIS
#include
<string.h>
size_t strlen(const char *s);
DESCRIPTION
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 (“POSIX.1”) defers to the ISO C standard.
The strlen () function shall compute the
number of bytes in the string to which s points, not
including the terminating null byte.
RETURN VALUE
The strlen () function shall return the
length of s; no return value shall be reserved to indicate
an error.
ERRORS
No errors are defined.
EXAMPLES
Getting String Lengths
The following example sets the maximum length of
key and
data by
using strlen () to get the lengths of those
strings.
#include <string.h>
...
struct element {
char *key;
char *data;
};
...
char *key, *data;
int len;
*keylength = *datalength = 0;
...
if ((len = strlen(key)) > *keylength)
*keylength = len;
if ((len = strlen(data)) > *datalength)
*datalength = len;
...
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
The Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <string.h>
CHANGE HISTORY
First released in Issue 1. Derived from Issue 1 of the SVID.
Issue 5
The RETURN VALUE section is updated to indicate that
strlen () returns the length of s,
and not s itself as was previously stated.
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