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⟶ ACL ⟶ Literature ⟶ Progress Reports ⟶ SPROGS Papers

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Applications Associates Literature Society Technology Software revisited

Early history □ Minutes of committee meetings □ Progress reports □ Other reports □ News cuttings □ In-house publications □ Committee papers □ Personal recollections □ ACL publications □ Books □ Early Atlas publications □ FR80 reports □ Atlas manuals □ ICL1906A manuals □ Other manuals and papers

General □ Applications Software Group □ Basic Software Group □ FR80 □ FR80 operations □ FR80 project notes □ FR80 technical notes □ FR80 user notes □ Graphics □ Graphics Section □ Graphics Notes □ Graphics User Notes □ PDP15 □ PDP15 Notes □ SPROGS □ SPROGS Technical Notes □ SPROGS Papers □ SPROGS Notes

SPROGS Paper No 30: The Treatment of Errors in SPROGS

R E Thomas

February 11 1973

1. INTRODUCTION

Errors occurring in high level routines such as histogram drawing, shading etc, are serviced by the two routines XERROR and ZERROR. Errors occurring in the basic SPROGS system are dealt with by the routine ERROR. Both systems allow the printing of arguments pertaining to the error.

2. ARGUMENT PRINTING

The COMMON block

       COMMON/SPRG4/ERR(6,2)

is used to pass arguments to the error routines for printing. ERR(1,1) is a count of the number of arguments, and is reset to 0 after each error routine call. ERR(1,2) is currently unused. Arguments are passed across in ERR(*,1), and the corresponding ERR (*,2) contains a marker indicating the type of argument. Current type settings are

   0 real number 
   1 packed text

The type marks are reset to 0 after each error call.

3. HIGH LEVEL ERRORS

The routine

      XERROR(N)

prints the error number, message (if any) and arguments, and will then RETURN. It is called for recoverable errors.

The routine

      ZERROR(N)

acts as XERROR, except routine FINIS is called. This routine will tidy any output devices and then STOP EE, but the routine may be replaced by a user to trap his own catastrophic errors.

4. BASIC SPROGS ERRORS

The routine

      ERROR (N)

prints the error number, message (if any) and arguments. If N is negative, it will RETURN. Otherwise it will STOP EE after closing output streams. Fatal errors in basic SPROGS may not be trapped by a user.

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