DosCaseMap

typedef struct _COUNTRYCODE {   /* ctryc */
 
  USHORT country;               /* country code */
  USHORT codepage;              /* code page */
 
} COUNTRYCODE;

#define INCL_DOSNLS

USHORT  rc = DosCaseMap(Length, Structure, BinaryString);

USHORT           Length;        /* Length of string to case map */
PCOUNTRYCODE     Structure;     /* Input data structure */
PCHAR            BinaryString;  /* Address of binary string */

USHORT           rc;            /* return code */

Example 

This example case maps a string for the default country and code page 850. 

#define INCL_DOSNLS

#define CURRENT_COUNTRY 0
#define NLS_CODEPAGE 850

COUNTRYCODE Country;
CHAR        BinString[30];
USHORT      rc;


   Country.country = CURRENT_COUNTRY;         /* Country code */
   Country.codepage = NLS_CODEPAGE;           /* Code page */
   strcpy(BinString,"Howdy");                 /* String to map */
   rc = DosCaseMap(sizeof(BinString),         /* Length of string */
                   &Country,                  /* Input data structure */
                   BinString);                /* String */