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lsame.c

int lsame_(char *ca, char *cb)
{
/*  -- LAPACK auxiliary routine (version 2.0) --   
       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
       Courant Institute, Argonne National Lab, and Rice University   
       September 30, 1994   

    Purpose   
    =======   

    LSAME returns .TRUE. if CA is the same letter as CB regardless of case.   

    Arguments   
    =========   

    CA      (input) CHARACTER*1   
    CB      (input) CHARACTER*1   
            CA and CB specify the single characters to be compared.   

   ===================================================================== 
*/  

    /* System generated locals */
    int ret_val;
    
    /* Local variables */
    int inta, intb, zcode;

    ret_val = *(unsigned char *)ca == *(unsigned char *)cb;
    if (ret_val) {
      return ret_val;
    }

    /* Now test for equivalence if both characters are alphabetic. */

    zcode = 'Z';

    /* Use 'Z' rather than 'A' so that ASCII can be detected on Prime   
       machines, on which ICHAR returns a value with bit 8 set.   
       ICHAR('A') on Prime machines returns 193 which is the same as   
       ICHAR('A') on an EBCDIC machine. */

    inta = *(unsigned char *)ca;
    intb = *(unsigned char *)cb;

    if (zcode == 90 || zcode == 122) {
      /* ASCII is assumed - ZCODE is the ASCII code of either lower or   
          upper case 'Z'. */
      if (inta >= 97 && inta <= 122) inta += -32;
      if (intb >= 97 && intb <= 122) intb += -32;

    } else if (zcode == 233 || zcode == 169) {
      /* EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or   
          upper case 'Z'. */
      if ((inta >= 129 && inta <= 137) || (inta >= 145 && inta <= 153) || (inta 
            >= 162 && inta <= 169))
          inta += 64;
      if ((intb >= 129 && intb <= 137) || (intb >= 145 && intb <= 153) || (intb 
            >= 162 && intb <= 169))
          intb += 64;
    } else if (zcode == 218 || zcode == 250) {
      /* ASCII is assumed, on Prime machines - ZCODE is the ASCII code   
          plus 128 of either lower or upper case 'Z'. */
      if (inta >= 225 && inta <= 250) inta += -32;
      if (intb >= 225 && intb <= 250) intb += -32;
    }
    ret_val = inta == intb;
    return ret_val;
    
} /* lsame_ */

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