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diff --git a/man3p/islower.3p b/man3p/islower.3p new file mode 100644 index 000000000..282a72b30 --- /dev/null +++ b/man3p/islower.3p @@ -0,0 +1,93 @@ +.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved +.TH "ISLOWER" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual" +.\" islower +.SH NAME +islower \- test for a lowercase letter +.SH SYNOPSIS +.LP +\fB#include <ctype.h> +.br +.sp +int islower(int\fP \fIc\fP\fB); +.br +\fP +.SH DESCRIPTION +.LP +The \fIislower\fP() function shall test whether \fIc\fP is a character +of class \fBlower\fP in the program's current locale; +see the Base Definitions volume of IEEE\ Std\ 1003.1-2001, Chapter +7, Locale. +.LP +The \fIc\fP argument is an \fBint\fP, the value of which the application +shall ensure is a character representable as an +\fBunsigned char\fP or equal to the value of the macro EOF. If the +argument has any other value, the behavior is undefined. +.SH RETURN VALUE +.LP +The \fIislower\fP() function shall return non-zero if \fIc\fP is a +lowercase letter; otherwise, it shall return 0. +.SH ERRORS +.LP +No errors are defined. +.LP +\fIThe following sections are informative.\fP +.SH EXAMPLES +.SS Testing for a Lowercase Letter +.LP +The following example tests whether the value is a lowercase letter, +based on the locale of the user, then uses it as part of a +key value. +.sp +.RS +.nf + +\fB#include <ctype.h> +#include <stdlib.h> +#include <locale.h> +\&... +char *keystr; +int elementlen, len; +char c; +\&... +setlocale(LC_ALL, ""); +\&... +len = 0; +while (len < elementlen) { + c = (char) (rand() % 256); +\&... + if (islower(c)) + keystr[len++] = c; + } +\&... +\fP +.fi +.RE +.SH APPLICATION USAGE +.LP +To ensure applications portability, especially across natural languages, +only this function and those listed in the SEE ALSO +section should be used for character classification. +.SH RATIONALE +.LP +None. +.SH FUTURE DIRECTIONS +.LP +None. +.SH SEE ALSO +.LP +\fIisalnum\fP() , \fIisalpha\fP() , \fIiscntrl\fP() , \fIisdigit\fP() +, \fIisgraph\fP() , +\fIisprint\fP() , \fIispunct\fP() , \fIisspace\fP() , \fIisupper\fP() +, \fIisxdigit\fP() , +\fIsetlocale\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001, +Chapter 7, Locale, \fI<ctype.h>\fP +.SH COPYRIGHT +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 . |