Originální popis anglicky:
tolower - transliterate uppercase characters to lowercase
Návod, kniha: POSIX Programmer's Manual
#include <ctype.h>
int tolower(int
c);
The
tolower() function has as a domain a type
int, the value of
which is representable as an
unsigned char or the value of EOF. If the
argument has any other value, the behavior is undefined. If the argument of
tolower() represents an uppercase letter, and there exists a
corresponding lowercase letter (as defined by character type
information in the program locale category
LC_CTYPE ), the result shall
be the corresponding lowercase letter. All other arguments in the domain are
returned unchanged.
Upon successful completion,
tolower() shall return the lowercase letter
corresponding to the argument passed; otherwise, it shall return the argument
unchanged.
No errors are defined.
The following sections are informative.
None.
None.
None.
None.
setlocale() , the Base Definitions volume of
IEEE Std 1003.1-2001, Chapter 7, Locale,
<ctype.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
.
