#include <ctype.h>
int isalpha(int c);
int isalpha_l(int c, locale_t locale);
The isalpha() function tests for any character for which
isupper() or islower() is true,
or any character that is one of an implementation-defined set of characters for
which none of iscntrl(), isdigit(),
ispunct(), or isspace() is true.
In the C locale, isalpha() returns true only for the
characters for which isupper() or
islower() is true.
The behavior of the isalpha() function is affected by the
current locale. To modify the behavior, change the LC_CTYPE
category in setlocale(), that is,
setlocale(LC_CTYPE, newlocale). In the C locale
or in a locale where character type information is not defined,
characters are classified according to the rules of the U.S.
ASCII 7-bit coded character set.
isalpha_l() behaves in the same way as isalpha()
without the _l suffix, but uses the specified locale rather than the
global or per-thread locale. A locale_t is returned by newlocale().
- c
-
Is an integer whose value is representable as an unsigned char
or the value of the macro EOF.
- locale
-
Is a locale_t perhaps returned by newlocale() or
LC_GLOBAL_LOCALE or 0 for the current thread locale set with uselocale().
The isalpha() and isalpha_l() functions
return non-zero for true and zero for false. If the parameter is
not in the domain of the function or the locale is invalid, the return result is undefined.
isalpha() conforms to ANSI/ISO 9899-1990.
MT-Safe, with exceptions.
The function isalpha() is MT-Safe as long as no thread calls setlocale() while
this function is executing.
The function isalpha_l() is MT-Safe as long as no thread calls freelocale() on locale while this function is executing.
None.
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
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PTC MKS Toolkit for Enterprise Developers 64-Bit Edition
- Functions:
- isalnum(), isalnum_l(), isascii(), isascii_l(), iscntrl(), iscntrl_l(), isdigit(), isdigit_l(), isgraph(), isgraph_l(), islower(), islower_l(), isprint(), isprint_l(), ispunct(), ispunct_l(), isspace(), isspace_l(), isupper(), isupper_l(), isxdigit(), isxdigit_l(), setlocale(), xlocale()
PTC MKS Toolkit 10.5 Documentation Build 40.