SUBROUTINE STR_CTOB( ISTRING, NUM, STATUS ) *+ * Name: * STR_CTOB * Purpose: * Converts 8-bit binary number from CHAR to BYTE * Language: * Starlink Fortran * Invocation: * CALL STR_CTOB( ISTRING, NUM, STATUS ) * Description: * Converts an 8-bit binary number stored in character form to the * equivalent byte quantity. Invalid characters in the input string * cause bad status to be returned. Numbers of less than 8-bits are * right adjusted. * Arguments: * ISTRING = CHARACTER*(*) (given) * The string to convert * NUM = BYTE (returned) * The converted value * STATUS = INTEGER (given and returned) * The global status. * Examples: * {routine_example_text} * {routine_example_description} * Pitfalls: * {pitfall_description}... * Notes: * {routine_notes}... * Prior Requirements: * {routine_prior_requirements}... * Side Effects: * {routine_side_effects}... * Algorithm: * {algorithm_description}... * Accuracy: * {routine_accuracy} * Timing: * {routine_timing} * External Routines Used: * {name_of_facility_or_package}: * {routine_used}... * Implementation Deficiencies: * {routine_deficiencies}... * References: * STR Subroutine Guide : http://www.sr.bham.ac.uk/asterix-docs/Programmer/Guides/str.html * Keywords: * package:str, usage:public, string conversion, bit operations * Copyright: * Copyright (C) University of Birmingham, 1995 * Authors: * RJV: Bob Vallance (ROSAT, University of Birmingham) * {enter_new_authors_here} * History: * 3 Jul 1995 (RJV): * Original version. * {enter_changes_here} * Bugs: * {note_any_bugs_here} *- * Type Definitions: IMPLICIT NONE ! No implicit typing * Global Constants: INCLUDE 'SAE_PAR' ! Standard SAE constants * Arguments Given: CHARACTER*(*) ISTRING * Arguments Returned: BYTE NUM * Status: INTEGER STATUS ! Global status * External References: EXTERNAL CHR_LEN INTEGER CHR_LEN EXTERNAL BIT_ORUB BYTE BIT_ORUB * Local Variables: CHARACTER*8 STRING INTEGER L INTEGER IBIT,JBIT BYTE BIT *. * Check inherited global status. IF ( STATUS .NE. SAI__OK ) RETURN NUM = 0 STRING = '00000000' * Right adjust number if necessary L = CHR_LEN(ISTRING) STRING(9-L:) = ISTRING(:L) * Scan string bit by bit IBIT=0 DO WHILE (IBIT.LE.7.AND.STATUS.EQ.SAI__OK) IF (IBIT.LT.7) THEN BIT = 2**IBIT ELSE BIT = -128 ENDIF JBIT=8-IBIT IF (STRING(JBIT:JBIT).EQ.'1') THEN NUM=BIT_ORUB(NUM,BIT) ELSE IF (STRING(JBIT:JBIT).NE.'0' ) THEN STATUS=SAI__ERROR CALL ERR_REP('BADCHAR','Invalid character in binary string', : STATUS) END IF IBIT=IBIT+1 END DO * Report any errors IF ( STATUS .NE. SAI__OK ) CALL AST_REXIT( 'STR_CTOB', STATUS ) END