DragonFly On-Line Manual Pages

ISUPPER(3)	      DragonFly Library Functions Manual	    ISUPPER(3)


isupper, isupper_l -- upper-case character test


Standard C Library (libc, -lc)


#include <ctype.h> int isupper(int c); int isupper_l int c locale_t locale


The isupper() and isupper_l() functions tests for any upper-case letter. The value of the argument must be representable as an unsigned char or the value of EOF. In the ASCII character set, this includes the following characters (with their numeric values shown in octal): 101 ``A'' 102 ``B'' 103 ``C'' 104 ``D'' 105 ``E'' 106 ``F'' 107 ``G'' 110 ``H'' 111 ``I'' 112 ``J'' 113 ``K'' 114 ``L'' 115 ``M'' 116 ``N'' 117 ``O'' 120 ``P'' 121 ``Q'' 122 ``R'' 123 ``S'' 124 ``T'' 125 ``U'' 126 ``V'' 127 ``W'' 130 ``X'' 131 ``Y'' 132 ``Z'' The _l-suffixed version takes an explicit locale argument, whereas the non-suffixed version uses the current global or per-thread locale.


The isupper() and isupper_l() functions return zero if the character tests false and returns non-zero if the character tests true.


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 iswupper() and iswupper_l() functions should be used instead.


ctype(3), ctype_l(3), iswupper(3), iswupper_l(3), toupper(3), xlocale(3), ascii(7)


The isupper() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The isupper_l() function conforms to IEEE Std 1003.1-2008 (``POSIX.1''). DragonFly 4.3 December 25, 2013 DragonFly 4.3