The isspace() and isspace_l() functions shall test whether c is a character of class space in the current locale, or in the locale represented by locale, respectively; see the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale. The c argument is an int, the value of which the application ...

#include <ctype.h> int isalnum(int c); int isalpha(int c); int isascii(int c); int isblank(int c); int iscntrl(int c); int isdigit(int c); int isgraph(int c); int islower(int c); int isprint(int c); int ispunct(int c); int isspace(int c); int isupper(int c); int isxdigit(int c); Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

ISSPACE(3) Library Functions Manual ISSPACE(3) isspace, isspace_l — whitespace single-byte character test · #include <ctype.h> int isspace(int c); int isspace_l(int c, locale_t locale); The isspace() and isspace_l() functions test for whitespace characters.

The list below explains the operation ... including space. ispunct() checks for any printable character which is not a space or an alphanumeric character. isspace() checks for white-space characters....

int isalnum(int c); int isalpha(int c); int iscntrl(int c); int isdigit(int c); int isgraph(int c); int islower(int c); int isprint(int c); int ispunct(int c); int isspace(int c); int isupper(int c); int isxdigit(int c);

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man isspace (1): The isspace() function shall test whether c is a character of class space 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 ensur

The toupper() function converts a lower-case letter to the corresponding upper-case letter. The argument must be representable as an unsigned char or the value of EOF. Although the toupper() function uses the current locale, the toupper_l() function may be passed a locale directly.

ISSPACE(3) Library Functions Manual ... <ctype.h> int isspace(int c); int isspace_l(int c, locale_t loc); DESCRIPTION The isspace() and isspace_l() functions test for white-space charac- ters....

The iswspace() function is the wide-character equivalent of the isspace(3) function. It tests whether wc is a wide character belonging to the wide-character class "space". The wide-character class "space" is disjoint from the wide- character class "graph" and therefore also disjoint from its ...

ISSPACE(3) NetBSD Library Functions Manual ISSPACE(3) NAME isspace -- white-space character test LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int isspace(int c); DESCRIPTION The isspace() function tests for the standard white-space characters for which isalnum(3) is false.

The isspace() and isspace_l() functions shall test whether c is a character of class space in the current locale, or in the locale represented by locale, respectively; see the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale.

Tests for any space, tab, carriage-return, newline, vertical-tab or form-feed (standard white-space characters) or for one of the current locale-defined set of characters for which isalnum() is false. In the “C” locale, isspace() returns true only for the standard white-space characters.

Section: POSIX Programmer's Manual (P) Updated: 2003 ... The isspace() function shall test whether c is a character of class space in the program's current locale; see the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale.

DESCRIPTION The isspace() function tests for the standard white-space characters for which isalnum(3) is false. The standard white-space characters are the following: ' ' Space character. f Form feed.

Linux Manuals · Session 3 · Search ... in header <cctype> int isspace( int ch ); Checks if the given character is whitespace character as classified by the currently installed C locale....

SYNOPSIS #include <ctype.h> int isalnum(int c); int isalpha(int c); int iscntrl(int c); int isdigit(int c); int isgraph(int c); int islower(int c); int isprint(int c); int ispunct(int c); int isspace(int c); int isupper(int c); int isxdigit(int c); int isascii(int c); int isblank(int c); int isalnum_l(int c, locale_t locale); int isalpha_l(int c, locale_t locale); int isblank_l(int c, locale_t locale); int iscntrl_l(int c, locale_t locale); int isdigit_l(int c, locale_t locale); int isgraph_l(int c, locale_t locale); int islower_l(int c, locale_t locale); int isprint_l(int c, locale_t locale);

Man page for isspace(3) on osf1, from the unix.com online archive.