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Sources/json-c/printbuf.h

  1 /*
  2  * $Id: printbuf.h,v 1.4 2006/01/26 02:16:28 mclark Exp $
  3  *
  4  * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
  5  * Michael Clark <michael@metaparadigm.com>
  6  *
  7  * This library is free software; you can redistribute it and/or modify
  8  * it under the terms of the MIT license. See COPYING for details.
  9  *
 10  *
 11  * Copyright (c) 2008-2009 Yahoo! Inc.  All rights reserved.
 12  * The copyrights to the contents of this file are licensed under the MIT License
 13  * (http://www.opensource.org/licenses/mit-license.php)
 14  */
 15 
 16 #ifndef _printbuf_h_
 17 #define _printbuf_h_
 18 
 19 #ifdef __cplusplus
 20 extern "C" {
 21 #endif
 22 
 23 struct printbuf {
 24   char *buf;
 25   int bpos;
 26   int size;
 27 };
 28 
 29 extern struct printbuf*
 30 printbuf_new(void);
 31 
 32 /* As an optimization, printbuf_memappend_fast is defined as a macro
 33  * that handles copying data if the buffer is large enough; otherwise
 34  * it invokes printbuf_memappend_real() which performs the heavy
 35  * lifting of realloc()ing the buffer and copying data.
 36  * Your code should not use printbuf_memappend directly--use
 37  * printbuf_memappend_fast instead.
 38  */
 39 extern int
 40 printbuf_memappend(struct printbuf *p, const char *buf, int size);
 41 
 42 #define printbuf_memappend_fast(p, bufptr, bufsize)          \
 43 do {                                                         \
 44   if ((p->size - p->bpos) > bufsize) {                       \
 45     memcpy(p->buf + p->bpos, (bufptr), bufsize);             \
 46     p->bpos += bufsize;                                      \
 47     p->buf[p->bpos]= '\0';                                   \
 48   } else {  printbuf_memappend(p, (bufptr), bufsize); }      \
 49 } while (0)
 50 
 51 #define printbuf_length(p) ((p)->bpos)
 52 
 53 /**
 54  * Set len bytes of the buffer to charvalue, starting at offset offset.
 55  * Similar to calling memset(x, charvalue, len);
 56  *
 57  * The memory allocated for the buffer is extended as necessary.
 58  *
 59  * If offset is -1, this starts at the end of the current data in the buffer.
 60  */
 61 extern int
 62 printbuf_memset(struct printbuf *pb, int offset, int charvalue, int len);
 63 
 64 extern int
 65 sprintbuf(struct printbuf *p, const char *msg, ...);
 66 
 67 extern void
 68 printbuf_reset(struct printbuf *p);
 69 
 70 extern void
 71 printbuf_free(struct printbuf *p);
 72 
 73 #ifdef __cplusplus
 74 }
 75 #endif
 76 
 77 #endif
 78 

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