case.c

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#include <grass/dbmi.h>

void db_char_to_lowercase(char *s)
{
    if (*s >= 'A' && *s <= 'Z')
        *s -= 'A' - 'a';
}

void db_char_to_uppercase(char *s)
{
    if (*s >= 'a' && *s <= 'z')
        *s += 'A' - 'a';
}

void db_Cstring_to_lowercase(char *s)
{
    while (*s)
        db_char_to_lowercase(s++);
}

void db_Cstring_to_uppercase(char *s)
{
    while (*s)
        db_char_to_uppercase(s++);
}

int db_nocase_compare(const char *a, const char *b)
{
    char s, t;

    while (*a && *b) {
        s = *a++;
        t = *b++;
        db_char_to_uppercase(&s);
        db_char_to_uppercase(&t);
        if (s != t)
            return 0;
    }
    return (*a == 0 && *b == 0);
}