| tolower(3) | upper case to lower case letter conversion |
| ctype, digittoint, isalnum, isalpha, isascii, iscntrl, isdigit, isgraph, ishexnumber, isideogram, islower, isnumber, isphonogram, isprint, ispunct, isrune, isspace, isspecial, isupper, isxdigit, toascii, tolower, toupper, isblank(3) | character classification functions |
| TOLOWER(3) | MidnightBSD Library Functions Manual | TOLOWER(3) |
tolower — upper
case to lower case letter conversion
Standard C Library (libc, -lc)
#include
<ctype.h>
int
tolower(int
c);
The
tolower()
function converts an upper-case letter to the corresponding lower-case
letter. The argument must be representable as an unsigned
char or the value of EOF.
If the argument is an upper-case letter, the
tolower() function returns the corresponding
lower-case letter if there is one; otherwise, the argument is returned
unchanged.
The 4.4BSD extension of accepting
arguments outside of the range of the unsigned char
type in locales with large character sets is considered obsolete and may not
be supported in future releases. The towlower()
function should be used instead.
The tolower() function conforms to
ISO/IEC 9899:1990
(“ISO C90”).
| July 25, 2010 | midnightbsd-3.1 |