CrossWorks for ARM User Guide

isalnumSynopsisDescriptionPortability#include int isalnum(int c);isalnum returns nonzero (true) if and only if isalpha or isdigit return true for value ofthe argument c.isalnum conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).See also isalpha (page 244) isdigit (page 245)isalphaSynopsisDescriptionPortability#include int isalpha(int c);isalpha returns nonzero (true) if and only if isupper or islower return true for value ofthe argument c.isalpha conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).See also isupper (page 246) isupper (page 245)isblankSynopsisDescriptionPortability#include int isblank(int c);isblank returns nonzero (true) if and only if the value of the argument c is either aspace character (' ') or the horizontal tab character ('\t').isblank ISO/IEC 9899:1999 (C99).See also isspace (page 246)iscntrlSynopsisDescriptionPortability#include int iscntrl(int c);iscntrl returns nonzero (true) if and only if the value of the argument c is a controlcharacter. Control characters have values 0 through 31 and the single value 127.iscntrl conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).244 Chapter 28 Standard C Library Reference