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    Length: 2821 (0xb05)
    Types: TextFile
    Names: »iname.c«

└─⟦a05ed705a⟧ Bits:30007078 DKUUG GNU 2/12/89
    └─⟦ff23ba0e6⟧ »./ghostscript-1.3.tar.Z« 
        └─⟦a24a58cd3⟧ 
            └─⟦this⟧ »iname.c« 

TextFile

/* Copyright (C) 1989 Aladdin Enterprises.  All rights reserved.
   Distributed by Free Software Foundation, Inc.

This file is part of Ghostscript.

Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.  Refer
to the Ghostscript General Public License for full details.

Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License.  A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities.  It should be in a file named COPYING.  Among other
things, the copyright notice and this notice must be preserved on all
copies.  */

/* iname.c */
/* Name lookup for GhostScript interpreter */
#include "ghost.h"
#include "alloc.h"
#include "errors.h"
#include "name.h"
#include "store.h"

/* The name table */
#define nt_size 256
private ref name_table[nt_size];	/* t_name */

/* Initialize the name table */
void
name_init()
{	ref *pname = name_table + nt_size;
	while ( --pname >= name_table ) pname->value.pname = 0;
}

/* Look up or enter a name in the table. */
/* Return 0 or an error code. */
/* The return may overlap the characters of the string! */
int
name_ref(byte *ptr, ushort size, ref *pref,
  int copyflag /* if true, copy name chars */)
{	uint hash = string_hash(ptr, size);
	register ref *ppname = name_table + (hash & (nt_size - 1)); /* t_name */
	register name *pname;
	byte *cptr;
	while ( (pname = ppname->value.pname) != 0 )
	   {	if ( pname->string.size == size &&
		     !memcmp(ptr, pname->string.value.bytes, size)
		   )
		   {	*pref = *ppname;
			return 0;
		   }
		ppname = &pname->next;
	   }
	/* Name was not in the table.  Make a new entry. */
	pname = (name *)alloc(sizeof(name), "name_ref");
	if ( pname == 0 ) return e_VMerror;
	if ( copyflag )
	   {	cptr = (byte *)alloc(size, "name_ref(string)");
		if ( cptr == 0 ) return e_VMerror;
		memcpy(cptr, ptr, size);
	   }
	else
		cptr = ptr;
	n_store_tasv(&pname->string, t_string, a_read+a_execute, size,
		     bytes, cptr);
	make_tv(&pname->next, t_null, pname, 0);
	pname->pvalue = pv_no_defn;
	make_tv(pref, t_name, pname, pname);
	*ppname = *pref;
	return 0;
}

/* Get the string for a name. */
void
name_string_ref(ref *pnref /* t_name */, ref *psref /* result, t_string */)
{	*psref = pnref->value.pname->string;
}

/* Enter a name during initialization. */
/* Fatal error if the entry fails. */
void
name_enter(char *str, ref *pref)
{	if ( name_ref((byte *)str, strlen(str), pref, 0) )
		printf("name_enter failed - %s", str), exit(1);
}