ctype.c

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#include <sys/types.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>

int toupper(int c)
{
        if (c >= 'a' && c <= 'z') {
                c += ('A' - 'a');
        }

        return c;
}

int tolower(int c)
{
        if (c >= 'A' && c <= 'Z') {
                c += ('a' - 'A');
        }

        return c;
}

int isalnum(int c)
{
        return isalpha(c) || isdigit(c);
}

int isalpha(int c)
{
        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}

int isascii(int c)
{
        return !(c & 0x80);
}

int isblank(int c)
{
        return c == '\t' || c == ' ';
}

int iscntrl(int c)
{
        return -ENOSYS;
}

int isdigit(int c)
{
        return (c >= '0' && c <= '9');
}

int isgraph(int c)
{
        return -ENOSYS;
}

int islower(int c)
{
        return (c >= 'a' && c <= 'z');
}

int isprint(int c)
{
        return -ENOSYS;
}

int ispunct(int c)
{
        return -ENOSYS;
}

int isspace(int c)
{
        return c == '0' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v';
}

int isupper(int c)
{
        return (c >= 'A' && c <= 'Z');
}

int isxdigit(int c)
{
        return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
}

/* End of a file */