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/* $Id: agxbuf.h,v 1.3 2009/06/03 01:10:51 ellson Exp $ $Revision: 1.3 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#ifdef __cplusplus
extern "C" {
#endif
#ifndef AGXBUF_H
#define AGXBUF_H
/* Extensible buffer:
* Malloc'ed memory is never released until agxbfree is called.
*/
typedef struct {
unsigned char *buf; /* start of buffer */
unsigned char *ptr; /* next place to write */
unsigned char *eptr; /* end of buffer */
int dyna; /* true if buffer is malloc'ed */
} agxbuf;
/* agxbinit:
* Initializes new agxbuf; caller provides memory.
* Assume if init is non-null, hint = sizeof(init[])
*/
extern void agxbinit(agxbuf * xb, unsigned int hint,
unsigned char *init);
/* agxbput_n:
* Append string s of length n into xb
*/
extern int agxbput_n(agxbuf * xb, char *s, unsigned int n);
/* agxbput:
* Append string s into xb
*/
extern int agxbput(agxbuf * xb, char *s);
/* agxbfree:
* Free any malloced resources.
*/
extern void agxbfree(agxbuf * xb);
/* agxbpop:
* Removes last character added, if any.
*/
extern int agxbpop(agxbuf * xb);
/* agxbmore:
* Expand buffer to hold at least ssz more bytes.
*/
extern int agxbmore(agxbuf * xb, int unsigned ssz);
/* agxbputc:
* Add character to buffer.
* int agxbputc(agxbuf*, char)
*/
#define agxbputc(X,C) ((((X)->ptr >= (X)->eptr) ? agxbmore(X,1) : 0), \
(int)(*(X)->ptr++ = ((unsigned char)C)))
/* agxbuse:
* Null-terminates buffer; resets and returns pointer to data;
* char* agxbuse(agxbuf* xb)
*/
#define agxbuse(X) (agxbputc(X,'\0'),(char*)((X)->ptr = (X)->buf))
/* agxbstart:
* Return pointer to beginning of buffer.
* char* agxbstart(agxbuf* xb)
*/
#define agxbstart(X) ((char*)((X)->buf))
/* agxblen:
* Return number of characters currently stored.
* int agxblen(agxbuf* xb)
*/
#define agxblen(X) (((X)->ptr)-((X)->buf))
/* agxbclear:
* Resets pointer to data;
* void agxbclear(agxbuf* xb)
*/
#define agxbclear(X) ((void)((X)->ptr = (X)->buf))
/* agxbnext:
* Next position for writing.
* char* agxbnext(agxbuf* xb)
*/
#define agxbnext(X) ((char*)((X)->ptr))
#endif
#ifdef __cplusplus
}
#endif
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