fla_lsame.c File Reference

(r12600)

Functions
logical	fla_lsame (char *ca, char *cb, ftnlen ca_len, ftnlen cb_len)

---

Function Documentation

logical fla_lsame	(	char *	ca,
		char *	cb,
		ftnlen	ca_len,
		ftnlen	cb_len
	)

Referenced by fla_dlamch(), and fla_slamch().

{
    /* System generated locals */
    logical ret_val;

    /* Local variables */
    static integer inta, intb, zcode;


/*  -- LAPACK auxiliary routine (version 3.2) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/*     November 2006 */

/*     .. Scalar Arguments .. */
/*     .. */

/*  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. */

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

/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. Local Scalars .. */
/*     .. */
/*     .. Executable Statements .. */

/*     Test if the characters are equal */

    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 */

/*     End of LSAME */

    return ret_val;
} /* fla_lsame */