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TOLOWER(3) Library Functions Manual TOLOWER(3)

tolowerupper case to lower case letter conversion

library “libc”

#include <ctype.h>

int
tolower(int c);

The () function converts an upper-case letter to the corresponding lower-case letter.

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.

ctype(3), isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), toupper(3), ascii(7)

The tolower() function conforms to ANSI X3.159-1989 (“ANSI C89”).

The argument to tolower() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details.

April 17, 2008 NetBSD-9.2