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printbuf.h
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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 
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
int bpos
Definition: printbuf.h:25
int sprintbuf(struct printbuf *p, const char *msg,...)
Definition: printbuf.c:152
struct printbuf * printbuf_new(void)
Definition: printbuf.c:34
void printbuf_reset(struct printbuf *p)
Definition: printbuf.c:180
int size
Definition: printbuf.h:26
void printbuf_free(struct printbuf *p)
Definition: printbuf.c:186
int printbuf_memappend(struct printbuf *p, const char *buf, int size)
Definition: printbuf.c:79
int printbuf_memset(struct printbuf *pb, int offset, int charvalue, int len)
Definition: printbuf.c:91
char * buf
Definition: printbuf.h:24