/* * Copyright (c) 2018 Cadence Design Systems Inc. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include #include "xrp_rb_file.h" static size_t xrp_rb_write_some(void *cookie, const void *buf, size_t size) { volatile struct xrp_ring_buffer *rb = cookie; uint32_t read = rb->read; uint32_t write = rb->write; size_t tail; if (read > write) { tail = read - 1 - write; } else if (read) { tail = rb->size - write; } else { tail = rb->size - 1 - write; } if (size < tail) tail = size; memcpy((char *)rb->data + write, buf, tail); write += tail; if (write == rb->size) write = 0; rb->write = write; return tail; } size_t xrp_rb_write(void *cookie, const void *buf, size_t size) { size_t write_total = 0; const char *p = buf; while (size) { size_t write = xrp_rb_write_some(cookie, p, size); if (write == 0) break; p += write; size -= write; write_total += write; } return write_total; }