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#include <u.h>
#include <libc.h>

char*
cistrstr(char *s, char *sub)
{
        int c, csub, n;

        csub = *sub;
        if(csub == '\0')
                return s;
        if(csub >= 'A' && csub <= 'Z')
                csub -= 'A' - 'a';
        sub++;
        n = strlen(sub);
        for(; c = *s; s++){
                if(c >= 'A' && c <= 'Z')
                        c -= 'A' - 'a';
                if(c == csub && cistrncmp(s+1, sub, n) == 0)
                        return s;
        }
        return nil;
}