My program crashes on #5. My input func ignoring EOF symbol and I using my own (because I'm a starter ;)) search in strings (that's below). I can't find test that crash my prog. Can you give me hint what's wrong or give test?

//-----------------------------
int srch(char *str, char *cond)
{
        char *blk;
        int i, j;
        blk = (char*)malloc((strlen(cond)+1)*sizeof(char));
        blk[strlen(cond)] = '\0';

        for(i = 0; i < strlen(str)-strlen(cond)+1; i++)
        {
                for(j = 0; j < strlen(cond); j++)
                        blk[j] = str[i+j];

                if(!strcmp(blk,cond))
                        return i+1;
        }

        return 0;
}

void parse(char **e, int Ecount, char **t, int Tcount)
{
        int i, j, pos;

        for(i = 0; i < Tcount; i++)
                for(j = 0; j < Ecount; j++)
                        if(strlen(e[j]) && strlen(t[i]) && (pos = srch(t[i],e[j])))
                        {
                                printf("%d %d",i+1,pos);
                                return;
                        }

        puts("Passed");
}