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

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/*$Id: iutil.h,v 1.2 2000/09/19 19:00:46 lpd Exp $ */
/* Interface to interpreter utilities */
/* Requires imemory.h, ostack.h */

#ifndef iutil_INCLUDED
#  define iutil_INCLUDED

/* ------ Object utilities ------ */

/* Copy refs from one place to another. */
/* (If we are copying to the stack, we can just use memcpy.) */
void refcpy_to_new(P4(ref * to, const ref * from, uint size,
		      gs_dual_memory_t *dmem));
int refcpy_to_old(P6(ref * aref, uint index, const ref * from, uint size,
		     gs_dual_memory_t *dmem, client_name_t cname));

/*
 * Fill an array with nulls.
 * For backward compatibility, we define the procedure with a new name.
 */
void refset_null_new(P3(ref * to, uint size, uint new_mask));
#define refset_null(to, size) refset_null_new(to, size, ialloc_new_mask)

/* Compare two objects for equality. */
bool obj_eq(P2(const ref *, const ref *));

/* Compare two objects for identity. */
/* (This is not a standard PostScript concept.) */
bool obj_ident_eq(P2(const ref *, const ref *));

/*
 * Set *pchars and *plen to point to the data of a name or string, and
 * return 0.  If the object isn't a name or string, return e_typecheck.
 * If the object is a string without read access, return e_invalidaccess.
 */
int obj_string_data(P3(const ref *op, const byte **pchars, uint *plen));

/*
 * Create a printable representation of an object, a la cvs and =
 * (full_print = 0), == (full_print = 1), or === (full_print = 2).  Return 0
 * if OK, 1 if the destination wasn't large enough, e_invalidaccess if the
 * object's contents weren't readable.  If the return value is 0 or 1,
 * *prlen contains the amount of data returned.  start_pos is the starting
 * output position -- the first start_pos bytes of output are discarded.
 *
 * The mem argument is only used for getting the type of structures,
 * not for allocating; if it is NULL and full_print != 0, structures will
 * print as --(struct)--.
 */
#define CVP_MAX_STRING 200  /* strings are truncated here if full_print = 1 */
int obj_cvp(P7(const ref * op, byte *str, uint len, uint * prlen,
	       int full_print, uint start_pos, gs_memory_t *mem));

/*
 * Create a printable representation of an object, a la cvs and =.  Return 0
 * if OK, e_rangecheck if the destination wasn't large enough,
 * e_invalidaccess if the object's contents weren't readable.  If pchars !=
 * NULL, then if the object was a string or name, store a pointer to its
 * characters in *pchars even if it was too large; otherwise, set *pchars =
 * str.  In any case, store the length in *prlen.
 *
 * obj_cvs is different from obj_cvp in two respects: if the printed
 * representation is too large, it returns e_rangecheck rather than 1;
 * and it can return a pointer to the data for names and strings, like
 * obj_string_data.
 */
int obj_cvs(P5(const ref * op, byte * str, uint len, uint * prlen,
	       const byte ** pchars));

/* Get an element from an array (packed or not). */
int array_get(P3(const ref *, long, ref *));

/* Get an element from a packed array. */
/* (This works for ordinary arrays too.) */
/* Source and destination are allowed to overlap if the source is packed, */
/* or if they are identical. */
void packed_get(P2(const ref_packed *, ref *));

/* Check to make sure an interval contains no object references */
/* to a space younger than a given one. */
/* Return 0 or e_invalidaccess. */
int refs_check_space(P3(const ref * refs, uint size, uint space));

/* ------ String utilities ------ */

/* Convert a C string to a string object. */
int string_to_ref(P4(const char *, ref *, gs_ref_memory_t *, client_name_t));

/* Convert a string object to a C string. */
/* Return 0 iff the buffer can't be allocated. */
char *ref_to_string(P3(const ref *, gs_memory_t *, client_name_t));

/* ------ Operand utilities ------ */

/* Get N numeric operands from the stack or an array. */
int num_params(P3(const ref *, int, double *));

/* float_params can lose accuracy for large integers. */
int float_params(P3(const ref *, int, float *));

/* Get a single real parameter. */
/* The only possible error is e_typecheck. */
int real_param(P2(const ref *, double *));

/* float_param can lose accuracy for large integers. */
int float_param(P2(const ref *, float *));

/* Get an integer parameter in a given range. */
int int_param(P3(const ref *, int, int *));

/* Make real values on the stack. */
/* Return e_limitcheck for infinities or double->float overflow. */
int make_reals(P3(ref *, const double *, int));
int make_floats(P3(ref *, const float *, int));

/* Define the gs_matrix type if necessary. */
#ifndef gs_matrix_DEFINED
#  define gs_matrix_DEFINED
typedef struct gs_matrix_s gs_matrix;
#endif

/* Read a matrix operand. */
int read_matrix(P2(const ref *, gs_matrix *));

/* Write a matrix operand. */
/* If dmem is NULL, the array is guaranteed newly allocated in imem. */
/* If dmem is not NULL, imem is ignored. */
int write_matrix_in(P4(ref *op, const gs_matrix *pmat, gs_dual_memory_t *dmem,
		       gs_ref_memory_t *imem));
#define write_matrix_new(op, pmat, imem)\
  write_matrix_in(op, pmat, NULL, imem)
#define write_matrix(op, pmat)\
  write_matrix_in(op, pmat, idmemory, NULL)

#endif /* iutil_INCLUDED */