Am 18.02.2016 14:12, schrieb Michael Kerrisk (man-pages):
> Hello Alan,
>
> On 02/03/2016 06:25 PM, Alan Aversa wrote:
>> Hello,
>>
>> The 2015-08-08 strlen man-page is incorrect. Here's a diff:
>>
>> --- a/man3/strlen.3
>> +++ b/man3/strlen.3
>> @@ -45,7 +45,7 @@ excluding the terminating null byte (\(aq\\0\(aq).
>> .SH RETURN VALUE
>> The
>> .BR strlen ()
>> -function returns the number of bytes in the string
>> +function returns the number of *characters* in the string that
>> precede the terminating null character
>
> I went for a simpler change: s/bytes/characters/
For my understanding this is wrong. 1 character may be represented by 2 or more bytes (utf8).
see this example, the string (test) is 3 characters long and takes 6 bytes space.
did i miss something ? did the specification of character change ?
re,
wh
#include <stdio.h>
#include <string.h>
int main()
{
char *test="ÖÄÜ";
int i;
int len=strlen(test);
printf("strlen=%d\n",len);
for(i=0;i<len;i++)
printf("%02x\n",(unsigned char)*(test+i));
return 0;
}
output:
strlen=6
c3
96
c3
84
c3
9c
>
>> .IR s .
>> .SH ATTRIBUTES
>> For an explanation of the terms used in this section, see
>> @@ -60,7 +60,7 @@ T{
>> T} Thread safety MT-Safe
>> .TE
>> .SH CONFORMING TO
>> -POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
>> +POSIX.1-2001, POSIX.1-2008, C89, C99, C11, SVr4, 4.3BSD.
>
> Fixed.
>
>> .SH SEE ALSO
>> .BR string (3),
>> .BR strnlen (3),
>>
>> Page 392 (PDF p. 390, §7.24.6.3) of the C11 standard
>> <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf> says:
>>
>> The *strlen* function returns the number of characters that precede
>> the terminating null character.
>
> Thanks for the report. Interesting, POSIX.1 still uses the term "bytes"
> the spec.
>
> Cheers,
>
> Michael
>
>
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