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File printbuf.h

/*
 * $Id: printbuf.h,v 1.4 2006/01/26 02:16:28 mclark Exp $
 *
 * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
 * Michael Clark <michael@metaparadigm.com>
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See COPYING for details.
 *
 *
 * Copyright (c) 2008-2009 Yahoo! Inc.  All rights reserved.
 * The copyrights to the contents of this file are licensed under the MIT License
 * (http://www.opensource.org/licenses/mit-license.php)
 */

/**
 * @file
 * @brief Internal string buffer handing.  Unless you're writing a 
 *        json_object_to_json_string_fn implementation for use with
 *        json_object_set_serializer() direct use of this is not
 *        recommended.
 */
#ifndef _printbuf_h_
#define _printbuf_h_

#ifdef __cplusplus
extern "C" {
#endif

struct printbuf {
  char *buf;
  int bpos;
  int size;
};
typedef struct printbuf printbuf;

extern struct printbuf*
printbuf_new(void);

/* As an optimization, printbuf_memappend_fast() is defined as a macro
 * that handles copying data if the buffer is large enough; otherwise
 * it invokes printbuf_memappend() which performs the heavy
 * lifting of realloc()ing the buffer and copying data.
 *
 * Your code should not use printbuf_memappend() directly unless it
 * checks the return code. Use printbuf_memappend_fast() instead.
 */
extern int
printbuf_memappend(struct printbuf *p, const char *buf, int size);

#define printbuf_memappend_fast(p, bufptr, bufsize)          \
do {                                                         \
  if ((p->size - p->bpos) > bufsize) {                       \
    memcpy(p->buf + p->bpos, (bufptr), bufsize);             \
    p->bpos += bufsize;                                      \
    p->buf[p->bpos]= '\0';                                   \
  } else {  printbuf_memappend(p, (bufptr), bufsize); }      \
} while (0)

#define printbuf_length(p) ((p)->bpos)

/**
 * Results in a compile error if the argument is not a string literal.
 */
#define _printbuf_check_literal(mystr) ("" mystr)

/**
 * This is an optimization wrapper around printbuf_memappend() that is useful
 * for appending string literals. Since the size of string constants is known
 * at compile time, using this macro can avoid a costly strlen() call. This is
 * especially helpful when a constant string must be appended many times. If
 * you got here because of a compilation error caused by passing something
 * other than a string literal, use printbuf_memappend_fast() in conjunction
 * with strlen().
 *
 * See also:
 *   printbuf_memappend_fast()
 *   printbuf_memappend()
 *   sprintbuf()
 */
#define printbuf_strappend(pb, str) \
   printbuf_memappend ((pb), _printbuf_check_literal(str), sizeof(str) - 1)

/**
 * Set len bytes of the buffer to charvalue, starting at offset offset.
 * Similar to calling memset(x, charvalue, len);
 *
 * The memory allocated for the buffer is extended as necessary.
 *
 * If offset is -1, this starts at the end of the current data in the buffer.
 */
extern int
printbuf_memset(struct printbuf *pb, int offset, int charvalue, int len);

/**
 * Formatted print to printbuf.
 *
 * This function is the most expensive of the available functions for appending
 * string data to a printbuf and should be used only where convenience is more
 * important than speed. Avoid using this function in high performance code or
 * tight loops; in these scenarios, consider using snprintf() with a static
 * buffer in conjunction with one of the printbuf_*append() functions.
 *
 * See also:
 *   printbuf_memappend_fast()
 *   printbuf_memappend()
 *   printbuf_strappend()
 */
extern int
sprintbuf(struct printbuf *p, const char *msg, ...);

extern void
printbuf_reset(struct printbuf *p);

extern void
printbuf_free(struct printbuf *p);

#ifdef __cplusplus
}
#endif

#endif

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2024-07-08 01:28:14
..	DIR	-	drwxr-xr-x	2025-06-25 01:10:46
arraylist.h	text/x-c	1.52 KB	-rw-r--r--	2018-03-06 04:18:59
bits.h	text/x-c	755 B	-rw-r--r--	2018-03-06 04:18:59
debug.h	text/x-c	1.68 KB	-rw-r--r--	2018-03-06 04:18:59
json.h	text/x-c	810 B	-rw-r--r--	2018-03-06 04:18:59
json_c_version.h	text/x-c	1.16 KB	-rw-r--r--	2018-03-06 04:18:59
json_config.h	text/plain	163 B	-rw-r--r--	2022-04-18 02:42:41
json_inttypes.h	text/x-c	350 B	-rw-r--r--	2018-03-06 04:18:59
json_object.h	text/x-c	37.1 KB	-rw-r--r--	2018-03-06 04:18:59
json_object_iterator.h	text/x-c	8.08 KB	-rw-r--r--	2018-03-06 04:18:59
json_pointer.h	text/x-c	4.72 KB	-rw-r--r--	2018-03-06 04:18:59
json_tokener.h	text/x-c	6.93 KB	-rw-r--r--	2018-03-06 04:18:59
json_util.h	text/x-c	2.93 KB	-rw-r--r--	2018-03-06 04:18:59
json_visit.h	text/x-c	3.11 KB	-rw-r--r--	2018-03-06 04:18:59
linkhash.h	text/x-c	10.89 KB	-rw-r--r--	2018-03-06 04:18:59
printbuf.h	text/x-c	3.77 KB	-rw-r--r--	2018-03-06 04:18:59

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