[Linux manuál]

strlen: získat délku řetězce

Originální popis anglicky: strlen - get string length

Návod, kniha: POSIX Programmer's Manual

STRUČNĚ

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

POPIS / INSTRUKCE

The strlen() function shall compute the number of bytes in the string to which s points, not including the terminating null byte.

NÁVRATOVÁ HODNOTA

The strlen() function shall return the length of s; no return value shall be reserved to indicate an error.

CHYBY / ERRORY

No errors are defined.
The following sections are informative.

PŘÍKLADY POUŽITÍ

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.

SOUVISEJÍCÍ

The Base Definitions volume of IEEE Std 1003.1-2001, <string.h> Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
2003 IEEE/The Open Group