1 // SPDX-License-Identifier: GPL-2.0+
13 int buf_init (circbuf_t * buf, unsigned int size)  in buf_init()  argument
17 	buf->size = 0;  in buf_init()
18 	buf->totalsize = size;  in buf_init()
19 	buf->data = (char *) malloc (sizeof (char) * size);  in buf_init()
20 	assert (buf->data != NULL);  in buf_init()
22 	buf->top = buf->data;  in buf_init()
23 	buf->tail = buf->data;  in buf_init()
24 	buf->end = &(buf->data[size]);  in buf_init()
32 	assert (buf->data != NULL);  in buf_free()
34 	free (buf->data);  in buf_free()
48 	p = buf->top;  in buf_pop()
51 	if (len > buf->size)  in buf_pop()
52 		len = buf->size;  in buf_pop()
57 		if (p == buf->end) {  in buf_pop()
58 			p = buf->data;  in buf_pop()
63 	buf->top = p;  in buf_pop()
64 	buf->size -= len;  in buf_pop()
71 	/* NOTE:  this function allows push to overwrite old data. */  in buf_push()
78 	p = buf->tail;  in buf_push()
82 		if (p == buf->end) {  in buf_push()
83 			p = buf->data;  in buf_push()
85 		/* Make sure pushing too much data just replaces old data */  in buf_push()
86 		if (buf->size < buf->totalsize) {  in buf_push()
87 			buf->size++;  in buf_push()
89 			buf->top++;  in buf_push()
90 			if (buf->top == buf->end) {  in buf_push()
91 				buf->top = buf->data;  in buf_push()
97 	buf->tail = p;  in buf_push()