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/*! @file lsame.c
* \brief Check if CA is the same letter as CB regardless of case.
*
* <pre>
* -- 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
* </pre>
*/
#include "slu_Cnames.h"
/*! \brief
<pre>
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.
=====================================================================
</pre>
*/
int lsame_(char *ca, char *cb)
{
/* 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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