harvey/sys/src/cmd/gs/src/errors.h

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*/

/*$Id: errors.h,v 1.4 2001/03/12 04:05:19 ghostgum Exp $ */
/* Definition of error codes */

#ifndef errors_INCLUDED
#  define errors_INCLUDED

/*
 * A procedure that may return an error always returns
 * a non-negative value (zero, unless otherwise noted) for success,
 * or negative for failure.
 * We use ints rather than an enum to avoid a lot of casting.
 */

/* Define the error name table */
extern const char *const gs_error_names[];

		/* ------ PostScript Level 1 errors ------ */

#define e_unknownerror (-1)	/* unknown error */
#define e_dictfull (-2)
#define e_dictstackoverflow (-3)
#define e_dictstackunderflow (-4)
#define e_execstackoverflow (-5)
#define e_interrupt (-6)
/* We also need to define gs_error_interrupt, for gpcheck.h. */
#undef gs_error_interrupt
#define gs_error_interrupt e_interrupt
#define e_invalidaccess (-7)
#define e_invalidexit (-8)
#define e_invalidfileaccess (-9)
#define e_invalidfont (-10)
#define e_invalidrestore (-11)
#define e_ioerror (-12)
#define e_limitcheck (-13)
#define e_nocurrentpoint (-14)
#define e_rangecheck (-15)
#define e_stackoverflow (-16)
#define e_stackunderflow (-17)
#define e_syntaxerror (-18)
#define e_timeout (-19)
#define e_typecheck (-20)
#define e_undefined (-21)
#define e_undefinedfilename (-22)
#define e_undefinedresult (-23)
#define e_unmatchedmark (-24)
#define e_VMerror (-25)

#define LEVEL1_ERROR_NAMES\
 "unknownerror", "dictfull", "dictstackoverflow", "dictstackunderflow",\
 "execstackoverflow", "interrupt", "invalidaccess", "invalidexit",\
 "invalidfileaccess", "invalidfont", "invalidrestore", "ioerror",\
 "limitcheck", "nocurrentpoint", "rangecheck", "stackoverflow",\
 "stackunderflow", "syntaxerror", "timeout", "typecheck", "undefined",\
 "undefinedfilename", "undefinedresult", "unmatchedmark", "VMerror"

		/* ------ Additional Level 2 and DPS errors ------ */

#define e_configurationerror (-26)
#define e_invalidcontext (-27)
#define e_undefinedresource (-28)
#define e_unregistered (-29)
/* invalidid is for the NeXT DPS extension. */
#define e_invalidid (-30)

#define LEVEL2_ERROR_NAMES\
 "configurationerror", "invalidcontext", "undefinedresource",\
 "unregistered", "invalidid"

#define ERROR_NAMES   LEVEL1_ERROR_NAMES, LEVEL2_ERROR_NAMES

		/* ------ Pseudo-errors used internally ------ */

/*
 * Internal code for a fatal error.
 * gs_interpret also returns this for a .quit with a positive exit code.
 */
#define e_Fatal (-100)

/*
 * Internal code for the .quit operator.
 * The real quit code is an integer on the operand stack.
 * gs_interpret returns this only for a .quit with a zero exit code.
 */
#define e_Quit (-101)

/*
 * Internal code for a normal exit from the interpreter.
 * Do not use outside of interp.c.
 */
#define e_InterpreterExit (-102)

/*
 * Internal code that indicates that a procedure has been stored in the
 * remap_proc of the graphics state, and should be called before retrying
 * the current token.  This is used for color remapping involving a call
 * back into the interpreter -- inelegant, but effective.
 */
#define e_RemapColor (-103)

/*
 * Internal code to indicate we have underflowed the top block
 * of the e-stack.
 */
#define e_ExecStackUnderflow (-104)

/*
 * Internal code for the vmreclaim operator with a positive operand.
 * We need to handle this as an error because otherwise the interpreter
 * won't reload enough of its state when the operator returns.
 */
#define e_VMreclaim (-105)

/*
 * Internal code for requesting more input from run_string.
 */
#define e_NeedInput (-106)

/*
 * Internal code for stdin callout.
 */
#define e_NeedStdin (-107)

/*
 * Internal code for stdout callout.
 */
#define e_NeedStdout (-108)

/*
 * Internal code for stderr callout.
 */
#define e_NeedStderr (-109)

/*
 * Internal code for a normal exit when usage info is displayed.
 * This allows Window versions of Ghostscript to pause until
 * the message can be read.
 */
#define e_Info (-110)

/*
 * Define which error codes require re-executing the current object.
 */
#define ERROR_IS_INTERRUPT(ecode)\
  ((ecode) == e_interrupt || (ecode) == e_timeout)

#endif /* errors_INCLUDED */