summaryrefslogtreecommitdiff
path: root/lib/librte_cmdline/cmdline_cirbuf.h
blob: f934292e3f9b01a982a99fe14af43831dbf98719 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
/*-
 *   BSD LICENSE
 * 
 *   Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
 *   All rights reserved.
 * 
 *   Redistribution and use in source and binary forms, with or without 
 *   modification, are permitted provided that the following conditions 
 *   are met:
 * 
 *     * Redistributions of source code must retain the above copyright 
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright 
 *       notice, this list of conditions and the following disclaimer in 
 *       the documentation and/or other materials provided with the 
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its 
 *       contributors may be used to endorse or promote products derived 
 *       from this software without specific prior written permission.
 * 
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 *  version: DPDK.L.1.2.3-3
 */

/*
 * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the University of California, Berkeley nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _CIRBUF_H_
#define _CIRBUF_H_

#ifdef __cplusplus
extern "C" {
#endif

/**
 * This structure is the header of a cirbuf type.
 */
struct cirbuf {
	unsigned int maxlen;    /**< total len of the fifo (number of elements) */
	unsigned int start;     /**< indice of the first elt */
	unsigned int end;       /**< indice of the last elt */
	unsigned int len;       /**< current len of fifo */
	char *buf;
};

/* #define CIRBUF_DEBUG */

#ifdef CIRBUF_DEBUG
#define dprintf(fmt, ...) printf("line %3.3d - " fmt, __LINE__, ##__VA_ARGS__)
#else
#define dprintf(args...) do {} while(0)
#endif


/**
 * Init the circular buffer
 */
void cirbuf_init(struct cirbuf *cbuf, char *buf, unsigned int start, unsigned int maxlen);


/**
 * Return 1 if the circular buffer is full
 */
#define CIRBUF_IS_FULL(cirbuf) ((cirbuf)->maxlen == (cirbuf)->len)

/**
 * Return 1 if the circular buffer is empty
 */
#define CIRBUF_IS_EMPTY(cirbuf) ((cirbuf)->len == 0)

/**
 * return current size of the circular buffer (number of used elements)
 */
#define CIRBUF_GET_LEN(cirbuf) ((cirbuf)->len)

/**
 * return size of the circular buffer (used + free elements)
 */
#define CIRBUF_GET_MAXLEN(cirbuf) ((cirbuf)->maxlen)

/**
 * return the number of free elts
 */
#define CIRBUF_GET_FREELEN(cirbuf) ((cirbuf)->maxlen - (cirbuf)->len)

/**
 * Iterator for a circular buffer
 *   c: struct cirbuf pointer
 *   i: an integer type internally used in the macro
 *   e: char that takes the value for each iteration
 */
#define CIRBUF_FOREACH(c, i, e)                                 \
	for ( i=0, e=(c)->buf[(c)->start] ;                     \
		i<((c)->len) ;                                  \
		i ++,  e=(c)->buf[((c)->start+i)%((c)->maxlen)])


/**
 * Add a character at head of the circular buffer. Return 0 on success, or
 * a negative value on error.
 */
int cirbuf_add_head_safe(struct cirbuf *cbuf, char c);

/**
 * Add a character at head of the circular buffer. You _must_ check that you
 * have enough free space in the buffer before calling this func.
 */
void cirbuf_add_head(struct cirbuf *cbuf, char c);

/**
 * Add a character at tail of the circular buffer. Return 0 on success, or
 * a negative value on error.
 */
int cirbuf_add_tail_safe(struct cirbuf *cbuf, char c);

/**
 * Add a character at tail of the circular buffer. You _must_ check that you
 * have enough free space in the buffer before calling this func.
 */
void cirbuf_add_tail(struct cirbuf *cbuf, char c);

/**
 * Remove a char at the head of the circular buffer. Return 0 on
 * success, or a negative value on error.
 */
int cirbuf_del_head_safe(struct cirbuf *cbuf);

/**
 * Remove a char at the head of the circular buffer. You _must_ check
 * that buffer is not empty before calling the function.
 */
void cirbuf_del_head(struct cirbuf *cbuf);

/**
 * Remove a char at the tail of the circular buffer. Return 0 on
 * success, or a negative value on error.
 */
int cirbuf_del_tail_safe(struct cirbuf *cbuf);

/**
 * Remove a char at the tail of the circular buffer. You _must_ check
 * that buffer is not empty before calling the function.
 */
void cirbuf_del_tail(struct cirbuf *cbuf);

/**
 * Return the head of the circular buffer. You _must_ check that
 * buffer is not empty before calling the function.
 */
char cirbuf_get_head(struct cirbuf *cbuf);

/**
 * Return the tail of the circular buffer. You _must_ check that
 * buffer is not empty before calling the function.
 */
char cirbuf_get_tail(struct cirbuf *cbuf);

/**
 * Add a buffer at head of the circular buffer. 'c' is a pointer to a
 * buffer, and n is the number of char to add. Return the number of
 * copied bytes on success, or a negative value on error.
 */
int cirbuf_add_buf_head(struct cirbuf *cbuf, const char *c, unsigned int n);

/**
 * Add a buffer at tail of the circular buffer. 'c' is a pointer to a
 * buffer, and n is the number of char to add. Return the number of
 * copied bytes on success, or a negative value on error.
 */
int cirbuf_add_buf_tail(struct cirbuf *cbuf, const char *c, unsigned int n);

/**
 * Remove chars at the head of the circular buffer. Return 0 on
 * success, or a negative value on error.
 */
int cirbuf_del_buf_head(struct cirbuf *cbuf, unsigned int size);

/**
 * Remove chars at the tail of the circular buffer. Return 0 on
 * success, or a negative value on error.
 */
int cirbuf_del_buf_tail(struct cirbuf *cbuf, unsigned int size);

/**
 * Copy a maximum of 'size' characters from the head of the circular
 * buffer to a flat one pointed by 'c'. Return the number of copied
 * chars.
 */
int cirbuf_get_buf_head(struct cirbuf *cbuf, char *c, unsigned int size);

/**
 * Copy a maximum of 'size' characters from the tail of the circular
 * buffer to a flat one pointed by 'c'. Return the number of copied
 * chars.
 */
int cirbuf_get_buf_tail(struct cirbuf *cbuf, char *c, unsigned int size);


/**
 * Set the start of the data to the index 0 of the internal buffer.
 */
void cirbuf_align_left(struct cirbuf *cbuf);

/**
 * Set the end of the data to the last index of the internal buffer.
 */
void cirbuf_align_right(struct cirbuf *cbuf);

#ifdef __cplusplus
}
#endif

#endif /* _CIRBUF_H_ */