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tolower(3) [netbsd man page]

TOLOWER(3)						   BSD Library Functions Manual 						TOLOWER(3)

tolower -- upper case to lower case letter conversion LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <ctype.h> int tolower(int c); DESCRIPTION
The tolower() function converts an upper-case letter to the corresponding lower-case letter. RETURN VALUES
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. SEE ALSO
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) STANDARDS
The tolower() function conforms to ANSI X3.159-1989 (``ANSI C89''). CAVEATS
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. BSD
April 17, 2008 BSD

Check Out this Related Man Page

CTYPE(2)							System Calls Manual							  CTYPE(2)

isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toascii, _toupper, _tolower, toupper, tolower - ASCII character classification SYNOPSIS
#include <u.h> #include <libc.h> #include <ctype.h> isalpha(c) isupper(c) islower(c) isdigit(c) isxdigit(c) isalnum(c) isspace(c) ispunct(c) isprint(c) isgraph(c) iscntrl(c) isascii(c) _toupper(c) _tolower(c) toupper(c) tolower(c) toascii(c) DESCRIPTION
These macros classify ASCII-coded integer values by table lookup. Each is a predicate returning nonzero for true, zero for false. Isascii is defined on all integer values; the rest are defined only where isascii is true and on the single non-ASCII value EOF; see fopen(2). isalpha c is a letter, a-z or A-Z isupper c is an upper case letter, A-Z islower c is a lower case letter, a-z isdigit c is a digit, 0-9 isxdigit c is a hexadecimal digit, 0-9 or a-f or A-F isalnum c is an alphanumeric character, a-z or A-Z or 0-9 isspace c is a space, horizontal tab, newline, vertical tab, formfeed, or carriage return (0x20, 0x9, 0xA, 0xB, 0xC, 0xD) ispunct c is a punctuation character (one of !"#$%&'()*+,-./:;<=>?@[]^_`{|}~) isprint c is a printing character, 0x20 (space) through 0x7E (tilde) isgraph c is a visible printing character, 0x21 (exclamation) through 0x7E (tilde) iscntrl c is a delete character, 0x7F, or ordinary control character, 0x0 through 0x1F isascii c is an ASCII character, 0x0 through 0x7F Toascii is not a classification macro; it converts its argument to ASCII range by anding with 0x7F. If c is an upper case letter, tolower returns the lower case version of the character; otherwise it returns the original character. Toup- per is similar, returning the upper case version of a character or the original character. Tolower and toupper are functions; _tolower and _toupper are corresponding macros which should only be used when it is known that the argument is upper case or lower case, respectively. Alef These routines are not provided in Alef. SOURCE
/sys/include/ctype.h for the macros. /sys/src/libc/port/ctype.c for the tables. BUGS
These macros are ASCII-centric. CTYPE(2)
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