lsame.c

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/* lsame.f -- translated by f2c (version 20100827).
   You must link the resulting object file with libf2c:
        on Microsoft Windows system, link with libf2c.lib;
        on Linux or Unix systems, link with .../path/to/libf2c.a -lm
        or, if you install libf2c.a in a standard place, with -lf2c -lm
        -- in that order, at the end of the command line, as in
                cc *.o -lf2c -lm
        Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,

                http://www.netlib.org/f2c/libf2c.zip
*/

#include "datatypes.h"

logical lsame_(char *ca, char *cb, ftnlen ca_len, ftnlen cb_len)
{
    /* System generated locals */
    logical ret_val;

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


/*  -- LAPACK auxiliary routine (version 3.1) -- */
/*     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 .. */
/*     .. */

/*     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;
} /* lsame_ */