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tolower(3) [freebsd man page]

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

NAME
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. The argument must be representable as an unsigned char or the value of EOF. 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. COMPATIBILITY
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. SEE ALSO
ctype(3), islower(3), towlower(3) STANDARDS
The tolower() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD
July 25, 2010 BSD

Check Out this Related Man Page

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

NAME
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
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