strnlen.c File Reference

#include <string.h>

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Functions
size_t	strnlen (const char *str, size_t maxlen)
	Returns the length of the given null-terminated byte string. More...

Function Documentation

strnlen()

size_t strnlen	(	const char *	str,
		size_t	maxlen
	)

Returns the length of the given null-terminated byte string.

Same as

See also

strlen, except that the function returns zero if str is a null pointer and returns maxlen if the null character was not found in the first maxlen bytes of str.

The behavior is undefined if str points to a character array which lacks the null character and the size of that character array < maxlen; in other words, an erroneous value of maxlen does not expose impending buffer overflow.

Parameters

str	pointer to the null-terminated byte string to be examined
maxlen	maximum number of characters to examine

Returns

The length of the null-terminated byte string str on success, zero if str is a null pointer, maxlen if the null character was not found.

Definition at line 21 of file strnlen.c.

{
    const char* cp;

    for(cp = str; maxlen != 0 && *cp != '\0'; cp++, maxlen--)
    {
        {
            ;
        }
    }

    return (size_t)(cp - str);
}

Referenced by strncat(), and strncpy().

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