83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*! @file lsame.c
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* \brief Check if CA is the same letter as CB regardless of case.
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*
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* <pre>
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* -- LAPACK auxiliary routine (version 2.0) --
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* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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* Courant Institute, Argonne National Lab, and Rice University
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* September 30, 1994
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* </pre>
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*/
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#include "slu_Cnames.h"
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/*! \brief
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<pre>
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Purpose
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=======
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LSAME returns .TRUE. if CA is the same letter as CB regardless of case.
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Arguments
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=========
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CA (input) CHARACTER*1
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CB (input) CHARACTER*1
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CA and CB specify the single characters to be compared.
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=====================================================================
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</pre>
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*/
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int lsame_(char *ca, char *cb)
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{
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/* System generated locals */
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int ret_val;
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/* Local variables */
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int inta, intb, zcode;
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ret_val = *(unsigned char *)ca == *(unsigned char *)cb;
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if (ret_val) {
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return ret_val;
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}
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/* Now test for equivalence if both characters are alphabetic. */
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zcode = 'Z';
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/* Use 'Z' rather than 'A' so that ASCII can be detected on Prime
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machines, on which ICHAR returns a value with bit 8 set.
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ICHAR('A') on Prime machines returns 193 which is the same as
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ICHAR('A') on an EBCDIC machine. */
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inta = *(unsigned char *)ca;
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intb = *(unsigned char *)cb;
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if (zcode == 90 || zcode == 122) {
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/* ASCII is assumed - ZCODE is the ASCII code of either lower or
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upper case 'Z'. */
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if (inta >= 97 && inta <= 122) inta += -32;
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if (intb >= 97 && intb <= 122) intb += -32;
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} else if (zcode == 233 || zcode == 169) {
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/* EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
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upper case 'Z'. */
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if (inta >= 129 && inta <= 137 || inta >= 145 && inta <= 153 || inta
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>= 162 && inta <= 169)
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inta += 64;
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if (intb >= 129 && intb <= 137 || intb >= 145 && intb <= 153 || intb
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>= 162 && intb <= 169)
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intb += 64;
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} else if (zcode == 218 || zcode == 250) {
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/* ASCII is assumed, on Prime machines - ZCODE is the ASCII code
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plus 128 of either lower or upper case 'Z'. */
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if (inta >= 225 && inta <= 250) inta += -32;
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if (intb >= 225 && intb <= 250) intb += -32;
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}
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ret_val = inta == intb;
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return ret_val;
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} /* lsame_ */
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