4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
8 PulseAudio is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published
10 by the Free Software Foundation; either version 2 of the License,
11 or (at your option) any later version.
13 PulseAudio is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with PulseAudio; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
33 #include <pulse/xmalloc.h>
35 #include <pulsecore/core-error.h>
36 #include <pulsecore/log.h>
37 #include <pulsecore/macro.h>
38 #include <pulsecore/refcnt.h>
42 #define BUFFER_LIMIT (64*1024)
43 #define READ_SIZE (1024)
49 pa_defer_event *defer_event;
50 pa_mainloop_api *mainloop;
54 size_t wbuf_length, wbuf_index, wbuf_valid_length;
57 size_t rbuf_length, rbuf_index, rbuf_valid_length;
59 void (*callback)(pa_ioline*io, const char *s, void *userdata);
65 static void io_callback(pa_iochannel*io, void *userdata);
66 static void defer_callback(pa_mainloop_api*m, pa_defer_event*e, void *userdata);
68 pa_ioline* pa_ioline_new(pa_iochannel *io) {
72 l = pa_xnew(pa_ioline, 1);
78 l->wbuf_length = l->wbuf_index = l->wbuf_valid_length = 0;
81 l->rbuf_length = l->rbuf_index = l->rbuf_valid_length = 0;
86 l->mainloop = pa_iochannel_get_mainloop_api(io);
88 l->defer_event = l->mainloop->defer_new(l->mainloop, defer_callback, l);
89 l->mainloop->defer_enable(l->defer_event, 0);
93 pa_iochannel_set_callback(io, io_callback, l);
98 static void ioline_free(pa_ioline *l) {
102 pa_iochannel_free(l->io);
105 l->mainloop->defer_free(l->defer_event);
112 void pa_ioline_unref(pa_ioline *l) {
114 pa_assert(PA_REFCNT_VALUE(l) >= 1);
116 if (PA_REFCNT_DEC(l) <= 0)
120 pa_ioline* pa_ioline_ref(pa_ioline *l) {
122 pa_assert(PA_REFCNT_VALUE(l) >= 1);
128 void pa_ioline_close(pa_ioline *l) {
130 pa_assert(PA_REFCNT_VALUE(l) >= 1);
135 pa_iochannel_free(l->io);
139 if (l->defer_event) {
140 l->mainloop->defer_free(l->defer_event);
141 l->defer_event = NULL;
148 void pa_ioline_puts(pa_ioline *l, const char *c) {
152 pa_assert(PA_REFCNT_VALUE(l) >= 1);
159 if (len > BUFFER_LIMIT - l->wbuf_valid_length)
160 len = BUFFER_LIMIT - l->wbuf_valid_length;
163 pa_assert(l->wbuf_length >= l->wbuf_valid_length);
165 /* In case the allocated buffer is too small, enlarge it. */
166 if (l->wbuf_valid_length + len > l->wbuf_length) {
167 size_t n = l->wbuf_valid_length+len;
168 char *new = pa_xmalloc(n);
170 memcpy(new, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
176 } else if (l->wbuf_index + l->wbuf_valid_length + len > l->wbuf_length) {
178 /* In case the allocated buffer fits, but the current index is too far from the start, move it to the front. */
179 memmove(l->wbuf, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
183 pa_assert(l->wbuf_index + l->wbuf_valid_length + len <= l->wbuf_length);
185 /* Append the new string */
186 memcpy(l->wbuf + l->wbuf_index + l->wbuf_valid_length, c, len);
187 l->wbuf_valid_length += len;
189 l->mainloop->defer_enable(l->defer_event, 1);
193 void pa_ioline_set_callback(pa_ioline*l, void (*callback)(pa_ioline*io, const char *s, void *userdata), void *userdata) {
195 pa_assert(PA_REFCNT_VALUE(l) >= 1);
197 l->callback = callback;
198 l->userdata = userdata;
201 static void failure(pa_ioline *l, int process_leftover) {
203 pa_assert(PA_REFCNT_VALUE(l) >= 1);
206 if (process_leftover && l->rbuf_valid_length > 0) {
207 /* Pass the last missing bit to the client */
210 char *p = pa_xstrndup(l->rbuf+l->rbuf_index, l->rbuf_valid_length);
211 l->callback(l, p, l->userdata);
217 l->callback(l, NULL, l->userdata);
224 static void scan_for_lines(pa_ioline *l, size_t skip) {
226 pa_assert(PA_REFCNT_VALUE(l) >= 1);
227 pa_assert(skip < l->rbuf_valid_length);
229 while (!l->dead && l->rbuf_valid_length > skip) {
233 if (!(e = memchr(l->rbuf + l->rbuf_index + skip, '\n', l->rbuf_valid_length - skip)))
238 p = l->rbuf + l->rbuf_index;
241 l->rbuf_index += m+1;
242 l->rbuf_valid_length -= m+1;
244 /* A shortcut for the next time */
245 if (l->rbuf_valid_length == 0)
249 l->callback(l, p, l->userdata);
254 /* If the buffer became too large and still no newline was found, drop it. */
255 if (l->rbuf_valid_length >= BUFFER_LIMIT)
256 l->rbuf_index = l->rbuf_valid_length = 0;
259 static int do_write(pa_ioline *l);
261 static int do_read(pa_ioline *l) {
263 pa_assert(PA_REFCNT_VALUE(l) >= 1);
265 while (!l->dead && pa_iochannel_is_readable(l->io)) {
269 len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
271 /* Check if we have to enlarge the read buffer */
272 if (len < READ_SIZE) {
273 size_t n = l->rbuf_valid_length+READ_SIZE;
275 if (n >= BUFFER_LIMIT)
278 if (l->rbuf_length >= n) {
279 /* The current buffer is large enough, let's just move the data to the front */
280 if (l->rbuf_valid_length)
281 memmove(l->rbuf, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
283 /* Enlarge the buffer */
284 char *new = pa_xmalloc(n);
285 if (l->rbuf_valid_length)
286 memcpy(new, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
295 len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
297 pa_assert(len >= READ_SIZE);
300 if ((r = pa_iochannel_read(l->io, l->rbuf+l->rbuf_index+l->rbuf_valid_length, len)) <= 0) {
301 if (r < 0 && errno != ECONNRESET) {
302 pa_log("read(): %s", pa_cstrerror(errno));
310 l->rbuf_valid_length += r;
312 /* Look if a line has been terminated in the newly read data */
313 scan_for_lines(l, l->rbuf_valid_length - r);
319 /* Try to flush the buffer */
320 static int do_write(pa_ioline *l) {
324 pa_assert(PA_REFCNT_VALUE(l) >= 1);
326 while (!l->dead && pa_iochannel_is_writable(l->io) && l->wbuf_valid_length) {
328 if ((r = pa_iochannel_write(l->io, l->wbuf+l->wbuf_index, l->wbuf_valid_length)) <= 0) {
330 if (r < 0 && errno != EPIPE)
331 pa_log("write(): %s", pa_cstrerror(errno));
339 l->wbuf_valid_length -= r;
341 /* A shortcut for the next time */
342 if (l->wbuf_valid_length == 0)
349 /* Try to flush read/write data */
350 static void do_work(pa_ioline *l) {
352 pa_assert(PA_REFCNT_VALUE(l) >= 1);
356 l->mainloop->defer_enable(l->defer_event, 0);
364 if (l->defer_close && !l->wbuf_valid_length)
370 static void io_callback(pa_iochannel*io, void *userdata) {
371 pa_ioline *l = userdata;
375 pa_assert(PA_REFCNT_VALUE(l) >= 1);
380 static void defer_callback(pa_mainloop_api*m, pa_defer_event*e, void *userdata) {
381 pa_ioline *l = userdata;
384 pa_assert(PA_REFCNT_VALUE(l) >= 1);
385 pa_assert(l->mainloop == m);
386 pa_assert(l->defer_event == e);
391 void pa_ioline_defer_close(pa_ioline *l) {
393 pa_assert(PA_REFCNT_VALUE(l) >= 1);
397 if (!l->wbuf_valid_length)
398 l->mainloop->defer_enable(l->defer_event, 1);
401 void pa_ioline_printf(pa_ioline *l, const char *format, ...) {
406 pa_assert(PA_REFCNT_VALUE(l) >= 1);
408 va_start(ap, format);
409 t = pa_vsprintf_malloc(format, ap);
412 pa_ioline_puts(l, t);