Source reference: LIB/CTYPE.CC¶

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#include "LIB/CTYPE.H"

int isdigit(int c) { return c >= '0' && c <= '9'; }
int isalpha(int c) {
    return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
int isspace(int c) { return c == ' ' || c == '\t' || c == '\n' || c == '\r'; }
int isalnum(int c) { return isalpha(c) || isdigit(c); }
int toupper(int c) {
    if (c >= 'a' && c <= 'z') return c - 'a' + 'A';
    return c;
}
int tolower(int c) {
    if (c >= 'A' && c <= 'Z') return c - 'A' + 'a';
    return c;
}

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