strlen(3posix) [posix man page]
STRLEN(P) POSIX Programmer's Manual STRLEN(P) NAME
strlen - get string length SYNOPSIS
#include <string.h> size_t strlen(const char *s); DESCRIPTION
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. The following sections are informative. 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, <string.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- 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 . IEEE
/The Open Group 2003 STRLEN(P)
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BCMP(P) POSIX Programmer's Manual BCMP(P) NAME
bcmp - memory operations (LEGACY) SYNOPSIS
#include <strings.h> int bcmp(const void *s1, const void *s2, size_t n); DESCRIPTION
The bcmp() function shall compare the first n bytes of the area pointed to by s1 with the area pointed to by s2. RETURN VALUE
The bcmp() function shall return 0 if s1 and s2 are identical; otherwise, it shall return non-zero. Both areas are assumed to be n bytes long. If the value of n is 0, bcmp() shall return 0. ERRORS
No errors are defined. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The memcmp() function is preferred over this function. For maximum portability, it is recommended to replace the function call to bcmp() as follows: #define bcmp(b1,b2,len) memcmp((b1), (b2), (size_t)(len)) RATIONALE
None. FUTURE DIRECTIONS
This function may be withdrawn in a future version. SEE ALSO
memcmp() , the Base Definitions volume of IEEE Std 1003.1-2001, <strings.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- 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 . IEEE
/The Open Group 2003 BCMP(P)