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109 lines
2.7 KiB
Fortran
109 lines
2.7 KiB
Fortran
SUBROUTINE sla__IDCHI (STRING, NPTR, NVEC, DIGIT)
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*+
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* - - - - - -
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* I D C H I
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* - - - - - -
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*
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* Internal routine used by INTIN
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*
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* Identify next character in string
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*
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* Given:
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* STRING char string
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* NPTR int pointer to character to be identified
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*
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* Returned:
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* NPTR int incremented unless end of field
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* NVEC int vector for identified character
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* DIGIT double double precision digit if 0-9
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*
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* NVEC takes the following values:
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*
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* 1 0-9
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* 2 space or TAB !!! n.b. ASCII TAB assumed !!!
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* 3 +
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* 4 -
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* 5 ,
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* 6 else
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* 7 outside string
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*
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* If the character is not 0-9, DIGIT is either unaltered or
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* is set to an arbitrary value.
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*
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* P.T.Wallace Starlink 22 December 1992
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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CHARACTER*(*) STRING
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INTEGER NPTR,NVEC
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DOUBLE PRECISION DIGIT
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CHARACTER K
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INTEGER NCHAR
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* Character/vector tables
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INTEGER NCREC
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PARAMETER (NCREC=14)
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CHARACTER KCTAB(NCREC)
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INTEGER KVTAB(NCREC)
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DATA KCTAB/'0','1','2','3','4','5','6','7','8','9',
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: ' ', '+','-',','/
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DATA KVTAB/10*1,2,3,4,5/
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* Handle pointer outside field
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IF (NPTR.LT.1.OR.NPTR.GT.LEN(STRING)) THEN
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NVEC=7
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ELSE
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* Not end of field: identify character
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K=STRING(NPTR:NPTR)
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DO NCHAR=1,NCREC
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IF (K.EQ.KCTAB(NCHAR)) THEN
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* Recognized
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NVEC=KVTAB(NCHAR)
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DIGIT=DBLE(NCHAR-1)
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GO TO 2300
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END IF
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END DO
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* Not recognized: check for TAB !!! n.b. ASCII assumed !!!
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IF (K.EQ.CHAR(9)) THEN
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* TAB: treat as space
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NVEC=2
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ELSE
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* Unrecognized
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NVEC=6
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END IF
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* Increment pointer
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2300 CONTINUE
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NPTR=NPTR+1
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END IF
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END
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