islower(3p) - phpMan

ISLOWER(P)                                                          ISLOWER(P)



NAME
       islower - test for a lowercase letter

SYNOPSIS
       #include <ctype.h>

       int islower(int c);


DESCRIPTION
       The  islower()  function  shall test whether c is a character of class lower in the
       program’s current locale; see the Base Definitions volume of  IEEE Std 1003.1-2001,
       Chapter 7, Locale.

       The  c  argument  is  an  int, the value of which the application shall ensure is a
       character representable as an unsigned char or equal to the value of the macro EOF.
       If the argument has any other value, the behavior is undefined.

RETURN VALUE
       The islower() function shall return non-zero if c is a lowercase letter; otherwise,
       it shall return 0.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
   Testing for a Lowercase Letter
       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.


              #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;
                  }
              ...

APPLICATION USAGE
       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.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       isalnum() , isalpha() , iscntrl() , isdigit() , isgraph() , isprint() , ispunct() ,
       isspace() , isupper() , isxdigit() , setlocale() , the Base Definitions  volume  of
       IEEE Std 1003.1-2001, Chapter 7, Locale, <ctype.h>

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 .



POSIX                                2003                           ISLOWER(P)

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