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-rw-r--r--sanei/sanei_wire.c694
1 files changed, 694 insertions, 0 deletions
diff --git a/sanei/sanei_wire.c b/sanei/sanei_wire.c
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+++ b/sanei/sanei_wire.c
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+/* sane - Scanner Access Now Easy.
+ Copyright (C) 1997 David Mosberger-Tang
+ This file is part of the SANE package.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ MA 02111-1307, USA.
+
+ As a special exception, the authors of SANE give permission for
+ additional uses of the libraries contained in this release of SANE.
+
+ The exception is that, if you link a SANE library with other files
+ to produce an executable, this does not by itself cause the
+ resulting executable to be covered by the GNU General Public
+ License. Your use of that executable is in no way restricted on
+ account of linking the SANE library code into it.
+
+ This exception does not, however, invalidate any other reasons why
+ the executable file might be covered by the GNU General Public
+ License.
+
+ If you submit changes to SANE to the maintainers to be included in
+ a subsequent release, you agree by submitting the changes that
+ those changes may be distributed with this exception intact.
+
+ If you write modifications of your own for SANE, it is your choice
+ whether to permit this exception to apply to your modifications.
+ If you do not wish that, delete this exception notice. */
+
+#include "sane/config.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/types.h>
+
+#include <sane/sane.h>
+#include "../include/sane/sanei_wire.h"
+
+#define BACKEND_NAME sanei_wire
+#include "../include/sane/sanei_debug.h"
+
+void
+sanei_w_space (Wire * w, size_t howmuch)
+{
+ size_t nbytes, left_over;
+ int fd = w->io.fd;
+ ssize_t nread, nwritten;
+
+ DBG (3, "sanei_w_space: %lu bytes for wire %d\n", (u_long) howmuch, fd);
+
+ if (howmuch > w->buffer.size)
+ DBG (2, "sanei_w_space: bigger than buffer (%lu bytes), "
+ "may be flush()\n", (u_long) w->buffer.size);
+
+ if (w->status != 0)
+ {
+ DBG (1, "sanei_w_space: wire is in invalid state %d\n",
+ w->status);
+ return;
+ }
+
+ if (w->buffer.curr + howmuch > w->buffer.end)
+ {
+ DBG (4, "sanei_w_space: free buffer size is %lu\n",
+ (u_long) (w->buffer.end - w->buffer.curr));
+ switch (w->direction)
+ {
+ case WIRE_ENCODE:
+ nbytes = w->buffer.curr - w->buffer.start;
+ w->buffer.curr = w->buffer.start;
+ DBG (4, "sanei_w_space: ENCODE: sending %lu bytes\n",
+ (u_long) nbytes);
+ while (nbytes > 0)
+ {
+ nwritten = (*w->io.write) (fd, w->buffer.curr, nbytes);
+ if (nwritten < 0)
+ {
+ DBG (1, "sanei_w_space: ENCODE: write failed (%d)\n", errno);
+ w->status = errno;
+ return;
+ }
+ w->buffer.curr += nwritten;
+ nbytes -= nwritten;
+ }
+ w->buffer.curr = w->buffer.start;
+ w->buffer.end = w->buffer.start + w->buffer.size;
+ DBG (4, "sanei_w_space: ENCODE: free buffer is now %lu\n",
+ (u_long) w->buffer.size);
+ break;
+
+ case WIRE_DECODE:
+ left_over = w->buffer.end - w->buffer.curr;
+
+ if ((signed) left_over < 0)
+ {
+ DBG (1, "sanei_w_space: DECODE: buffer underflow\n");
+ return;
+ }
+
+ if (left_over)
+ {
+ DBG (4, "sanei_w_space: DECODE: %lu bytes left in buffer\n",
+ (u_long) left_over);
+ memmove (w->buffer.start, w->buffer.curr, left_over);
+ }
+ w->buffer.curr = w->buffer.start;
+ w->buffer.end = w->buffer.start + left_over;
+
+ DBG (4, "sanei_w_space: DECODE: receiving data\n");
+ do
+ {
+ nread = (*w->io.read) (fd, w->buffer.end,
+ w->buffer.size - left_over);
+ if (nread <= 0)
+ {
+ DBG (2, "sanei_w_space: DECODE: no data received (%d)\n",
+ errno);
+ if (nread == 0)
+ errno = EINVAL;
+ w->status = errno;
+ return;
+ }
+ left_over += nread;
+ w->buffer.end += nread;
+ }
+ while (left_over < howmuch);
+ DBG (4, "sanei_w_space: DECODE: %lu bytes read\n",
+ (u_long) (w->buffer.end - w->buffer.start));
+ break;
+
+ case WIRE_FREE:
+ DBG (4, "sanei_w_space: FREE: doing nothing for free operation\n");
+ break;
+ }
+ }
+ DBG (4, "sanei_w_space: done\n");
+}
+
+void
+sanei_w_void (Wire * w)
+{
+ DBG (3, "sanei_w_void: wire %d (void debug output)\n", w->io.fd);
+}
+
+void
+sanei_w_array (Wire * w, SANE_Word * len_ptr, void **v,
+ WireCodecFunc w_element, size_t element_size)
+{
+ SANE_Word len;
+ char *val;
+ int i;
+
+ DBG (3, "sanei_w_array: wire %d, elements of size %lu\n", w->io.fd,
+ (u_long) element_size);
+
+ if (w->direction == WIRE_FREE)
+ {
+ if (*len_ptr && *v)
+ {
+ DBG (4, "sanei_w_array: FREE: freeing array (%d elements)\n",
+ *len_ptr);
+ val = *v;
+ for (i = 0; i < *len_ptr; ++i)
+ {
+ (*w_element) (w, val);
+ val += element_size;
+ }
+ free (*v);
+ w->allocated_memory -= (*len_ptr * element_size);
+ }
+ else
+ DBG (1, "sanei_w_array: FREE: tried to free array but *len_ptr or *v "
+ "was NULL\n");
+
+ DBG (4, "sanei_w_array: FREE: done\n");
+ return;
+ }
+
+ if (w->direction == WIRE_ENCODE)
+ len = *len_ptr;
+ DBG (4, "sanei_w_array: send/receive array length\n");
+ sanei_w_word (w, &len);
+
+ if (w->status)
+ {
+ DBG (1, "sanei_w_array: bad status: %d\n", w->status);
+ return;
+ }
+ DBG (4, "sanei_w_array: array has %d elements\n", len);
+
+ if (w->direction == WIRE_DECODE)
+ {
+ *len_ptr = len;
+ if (len)
+ {
+ if (((unsigned int) len) > MAX_MEM
+ || ((unsigned int) len * element_size) > MAX_MEM
+ || (w->allocated_memory + len * element_size) > MAX_MEM)
+ {
+ DBG (0, "sanei_w_array: DECODE: maximum amount of allocated memory "
+ "exceeded (limit: %u, new allocation: %u, total: %u bytes)\n",
+ MAX_MEM, len * element_size, MAX_MEM + len * element_size);
+ w->status = ENOMEM;
+ return;
+ }
+ *v = malloc (len * element_size);
+ if (*v == 0)
+ {
+ /* Malloc failed, so return an error. */
+ DBG (1, "sanei_w_array: DECODE: not enough free memory\n");
+ w->status = ENOMEM;
+ return;
+ }
+ memset (*v, 0, len * element_size);
+ w->allocated_memory += (len * element_size);
+ }
+ else
+ *v = 0;
+ }
+
+ val = *v;
+ DBG (4, "sanei_w_array: transferring array elements\n");
+ for (i = 0; i < len; ++i)
+ {
+ (*w_element) (w, val);
+ val += element_size;
+ if (w->status)
+ {
+ DBG (1, "sanei_w_array: bad status: %d\n", w->status);
+ return;
+ }
+ }
+ DBG (4, "sanei_w_array: done\n");
+}
+
+void
+sanei_w_ptr (Wire * w, void **v, WireCodecFunc w_value, size_t value_size)
+{
+ SANE_Word is_null;
+
+ DBG (3, "sanei_w_ptr: wire %d, value pointer at is %lu bytes\n", w->io.fd,
+ (u_long) value_size);
+
+ if (w->direction == WIRE_FREE)
+ {
+ if (*v && value_size)
+ {
+ DBG (4, "sanei_w_ptr: FREE: freeing value\n");
+ (*w_value) (w, *v);
+ free (*v);
+ w->allocated_memory -= value_size;
+ }
+ else
+ DBG (1, "sanei_w_ptr: FREE: tried to free value but *v or value_size "
+ "was NULL\n");
+
+ DBG (4, "sanei_w_ptr: FREE: done\n");
+ return;
+ }
+ if (w->direction == WIRE_ENCODE)
+ is_null = (*v == 0);
+
+ DBG (4, "sanei_w_ptr: send/receive is_null\n");
+ sanei_w_word (w, &is_null);
+ if (w->status)
+ {
+ DBG (1, "sanei_w_ptr: bad status: %d\n", w->status);
+ return;
+ }
+
+ if (!is_null)
+ {
+ if (w->direction == WIRE_DECODE)
+ {
+ DBG (4, "sanei_w_ptr: DECODE: receive data pointed at\n");
+ if (value_size > MAX_MEM)
+ {
+ DBG (0, "sanei_w_ptr: DECODE: maximum amount of allocated memory "
+ "exceeded (limit: %u, new allocation: %u, total: %u bytes)\n",
+ MAX_MEM, value_size, (w->allocated_memory + value_size));
+ w->status = ENOMEM;
+ return;
+ }
+
+ *v = malloc (value_size);
+ if (*v == 0)
+ {
+ /* Malloc failed, so return an error. */
+ DBG (1, "sanei_w_ptr: DECODE: not enough free memory\n");
+ w->status = ENOMEM;
+ return;
+ }
+ w->allocated_memory += value_size;
+ memset (*v, 0, value_size);
+ }
+ (*w_value) (w, *v);
+ }
+ else if (w->direction == WIRE_DECODE)
+ *v = 0;
+
+ DBG (4, "sanei_w_ptr: done\n");
+}
+
+void
+sanei_w_byte (Wire * w, SANE_Byte * v)
+{
+ DBG (3, "sanei_w_byte: wire %d\n", w->io.fd);
+ (*w->codec.w_byte) (w, v);
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_byte: value = %d\n", *v);
+}
+
+void
+sanei_w_char (Wire * w, SANE_Char * v)
+{
+ DBG (3, "sanei_w_char: wire %d\n", w->io.fd);
+ (*w->codec.w_char) (w, v);
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_char: value = %d\n", *v);
+}
+
+void
+sanei_w_word (Wire * w, SANE_Word * v)
+{
+ DBG (3, "sanei_w_word: wire %d\n", w->io.fd);
+ (*w->codec.w_word) (w, v);
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_word: value = %d\n", *v);
+}
+
+void
+sanei_w_string (Wire * w, SANE_String * v)
+{
+ DBG (3, "sanei_w_string: wire %d\n", w->io.fd);
+ (*w->codec.w_string) (w, v);
+ if (w->direction != WIRE_FREE && w->status == 0)
+ DBG (4, "sanei_w_string: value = %s\n", *v);
+}
+
+void
+sanei_w_status (Wire * w, SANE_Status * v)
+{
+ SANE_Word word = *v;
+
+ DBG (3, "sanei_w_status: wire %d\n", w->io.fd);
+
+ sanei_w_word (w, &word);
+ if (w->direction == WIRE_DECODE)
+ *v = word;
+
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_status: value = %d\n", word);
+}
+
+void
+sanei_w_bool (Wire * w, SANE_Bool * v)
+{
+ SANE_Word word = *v;
+
+ DBG (3, "sanei_w_bool: wire %d\n", w->io.fd);
+ sanei_w_word (w, &word);
+ if (w->direction == WIRE_DECODE)
+ *v = word;
+
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_bool: value = %s\n",
+ ((word == SANE_TRUE) ? ("true") : ("false")));
+}
+
+void
+sanei_w_constraint_type (Wire * w, SANE_Constraint_Type * v)
+{
+ SANE_Word word = *v;
+
+ DBG (3, "sanei_w_constraint_type: wire %d\n", w->io.fd);
+
+ sanei_w_word (w, &word);
+ if (w->direction == WIRE_DECODE)
+ *v = word;
+
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_constraint_type: value = %d\n", word);
+}
+
+void
+sanei_w_value_type (Wire * w, SANE_Value_Type * v)
+{
+ SANE_Word word = *v;
+
+ DBG (3, "sanei_w_value_type: wire %d\n", w->io.fd);
+
+ sanei_w_word (w, &word);
+ if (w->direction == WIRE_DECODE)
+ *v = word;
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_value_type: value = %d\n", word);
+}
+
+void
+sanei_w_unit (Wire * w, SANE_Unit * v)
+{
+ SANE_Word word = *v;
+
+ DBG (3, "sanei_w_unit: wire %d\n", w->io.fd);
+ sanei_w_word (w, &word);
+ if (w->direction == WIRE_DECODE)
+ *v = word;
+
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_unit: value = %d\n", word);
+ /* gosh... all the sane_w_something should be a macro or something */
+}
+
+void
+sanei_w_action (Wire * w, SANE_Action * v)
+{
+ SANE_Word word = *v;
+
+ DBG (3, "sanei_w_action: wire %d\n", w->io.fd);
+
+ sanei_w_word (w, &word);
+ if (w->direction == WIRE_DECODE)
+ *v = word;
+
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_action: value = %d\n", word);
+}
+
+void
+sanei_w_frame (Wire * w, SANE_Frame * v)
+{
+ SANE_Word word = *v;
+
+ DBG (3, "sanei_w_frame: wire %d\n", w->io.fd);
+
+ sanei_w_word (w, &word);
+ if (w->direction == WIRE_DECODE)
+ *v = word;
+
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_frame: value = %d\n", word);
+}
+
+void
+sanei_w_range (Wire * w, SANE_Range * v)
+{
+ DBG (3, "sanei_w_range: wire %d\n", w->io.fd);
+ sanei_w_word (w, &v->min);
+ sanei_w_word (w, &v->max);
+ sanei_w_word (w, &v->quant);
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_range: min/max/step = %f/%f/%f\n",
+ SANE_UNFIX (v->min), SANE_UNFIX (v->max), SANE_UNFIX (v->quant));
+}
+
+void
+sanei_w_device (Wire * w, SANE_Device * v)
+{
+ DBG (3, "sanei_w_device: wire %d\n", w->io.fd);
+ sanei_w_string (w, (SANE_String *) & v->name);
+ sanei_w_string (w, (SANE_String *) & v->vendor);
+ sanei_w_string (w, (SANE_String *) & v->model);
+ sanei_w_string (w, (SANE_String *) & v->type);
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_device: %s %s from %s (%s)\n", v->name, v->model,
+ v->vendor, v->type);
+}
+
+void
+sanei_w_device_ptr (Wire * w, SANE_Device ** v)
+{
+ DBG (3, "sanei_w_device_ptr: wire %d\n", w->io.fd);
+ sanei_w_ptr (w, (void **) v, (WireCodecFunc) sanei_w_device, sizeof (**v));
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_device_ptr: device struct at %p\n", *v);
+}
+
+void
+sanei_w_option_descriptor (Wire * w, SANE_Option_Descriptor * v)
+{
+ SANE_Word len;
+
+ DBG (3, "sanei_w_option_descriptor: wire %d\n", w->io.fd);
+
+ sanei_w_string (w, (SANE_String *) & v->name);
+ sanei_w_string (w, (SANE_String *) & v->title);
+ sanei_w_string (w, (SANE_String *) & v->desc);
+ sanei_w_value_type (w, &v->type);
+ sanei_w_unit (w, &v->unit);
+ sanei_w_word (w, &v->size);
+ sanei_w_word (w, &v->cap);
+ sanei_w_constraint_type (w, &v->constraint_type);
+
+ if (w->direction != WIRE_FREE)
+ DBG (4, "sanei_w_option_descriptor: option %s\n", v->name);
+
+ switch (v->constraint_type)
+ {
+ case SANE_CONSTRAINT_NONE:
+ break;
+
+ case SANE_CONSTRAINT_RANGE:
+ sanei_w_ptr (w, (void **) &v->constraint.range,
+ (WireCodecFunc) sanei_w_range, sizeof (SANE_Range));
+ break;
+
+ case SANE_CONSTRAINT_WORD_LIST:
+ if (w->direction != WIRE_DECODE)
+ len = v->constraint.word_list[0] + 1;
+ sanei_w_array (w, &len, (void **) &v->constraint.word_list,
+ w->codec.w_word, sizeof (SANE_Word));
+ break;
+
+ case SANE_CONSTRAINT_STRING_LIST:
+ if (w->direction != WIRE_DECODE)
+ {
+ for (len = 0; v->constraint.string_list[len]; ++len);
+ ++len; /* send NULL string, too */
+ }
+ sanei_w_array (w, &len, (void **) &v->constraint.string_list,
+ w->codec.w_string, sizeof (SANE_String));
+ break;
+ }
+ DBG (4, "sanei_w_option_descriptor: done\n");
+}
+
+void
+sanei_w_option_descriptor_ptr (Wire * w, SANE_Option_Descriptor ** v)
+{
+ DBG (3, "sanei_w_option_descriptor_ptr: wire %d\n", w->io.fd);
+ sanei_w_ptr (w, (void **) v,
+ (WireCodecFunc) sanei_w_option_descriptor, sizeof (**v));
+ DBG (4, "sanei_w_option_descriptor_ptr: done\n");
+}
+
+void
+sanei_w_parameters (Wire * w, SANE_Parameters * v)
+{
+ DBG (3, "sanei_w_parameters: wire %d\n", w->io.fd);
+ sanei_w_frame (w, &v->format);
+ sanei_w_bool (w, &v->last_frame);
+ sanei_w_word (w, &v->bytes_per_line);
+ sanei_w_word (w, &v->pixels_per_line);
+ sanei_w_word (w, &v->lines);
+ sanei_w_word (w, &v->depth);
+ if (w->direction != WIRE_FREE)
+ DBG (4,
+ "sanei_w_parameters: format/last/bpl/ppl/lines/depth = "
+ "%d/%d/%d/%d/%d/%d\n", v->format, v->last_frame, v->bytes_per_line,
+ v->pixels_per_line, v->lines, v->depth);
+}
+
+static void
+flush (Wire * w)
+{
+ DBG (3, "flush: wire %d\n", w->io.fd);
+ if (w->direction == WIRE_ENCODE)
+ sanei_w_space (w, w->buffer.size + 1);
+ else if (w->direction == WIRE_DECODE)
+ w->buffer.curr = w->buffer.end = w->buffer.start;
+ if (w->status != 0)
+ DBG (2, "flush: error status %d\n", w->status);
+ DBG (4, "flush: wire flushed\n");
+}
+
+void
+sanei_w_set_dir (Wire * w, WireDirection dir)
+{
+ DBG (3, "sanei_w_set_dir: wire %d, old direction WIRE_%s\n", w->io.fd,
+ w->direction == WIRE_ENCODE ? "ENCODE" :
+ (w->direction == WIRE_DECODE ? "DECODE" : "FREE"));
+ if (w->direction == WIRE_DECODE && w->buffer.curr != w->buffer.end)
+ DBG (1, "sanei_w_set_dir: WARNING: will delete %lu bytes from buffer\n",
+ (u_long) (w->buffer.end - w->buffer.curr));
+ flush (w);
+ w->direction = dir;
+ DBG (4, "sanei_w_set_dir: direction changed\n");
+ flush (w);
+ DBG (3, "sanei_w_set_dir: wire %d, new direction WIRE_%s\n", w->io.fd,
+ dir == WIRE_ENCODE ? "ENCODE" :
+ (dir == WIRE_DECODE ? "DECODE" : "FREE"));
+}
+
+void
+sanei_w_call (Wire * w,
+ SANE_Word procnum,
+ WireCodecFunc w_arg, void *arg,
+ WireCodecFunc w_reply, void *reply)
+{
+
+ DBG (3, "sanei_w_call: wire %d (old status %d)\n", w->io.fd, w->status);
+ w->status = 0;
+ sanei_w_set_dir (w, WIRE_ENCODE);
+
+ DBG (4, "sanei_w_call: sending request (procedure number: %d)\n", procnum);
+ sanei_w_word (w, &procnum);
+ (*w_arg) (w, arg);
+
+ if (w->status == 0)
+ {
+ DBG (4, "sanei_w_call: receiving reply\n");
+ sanei_w_set_dir (w, WIRE_DECODE);
+ (*w_reply) (w, reply);
+ }
+
+ if (w->status != 0)
+ DBG (2, "sanei_w_call: error status %d\n", w->status);
+ DBG (4, "sanei_w_call: done\n");
+}
+
+void
+sanei_w_reply (Wire * w, WireCodecFunc w_reply, void *reply)
+{
+ DBG (3, "sanei_w_reply: wire %d (old status %d)\n", w->io.fd, w->status);
+ w->status = 0;
+ sanei_w_set_dir (w, WIRE_ENCODE);
+ (*w_reply) (w, reply);
+ flush (w);
+ if (w->status != 0)
+ DBG (2, "sanei_w_reply: error status %d\n", w->status);
+ DBG (4, "sanei_w_reply: done\n");
+}
+
+void
+sanei_w_free (Wire * w, WireCodecFunc w_reply, void *reply)
+{
+ WireDirection saved_dir = w->direction;
+
+ DBG (3, "sanei_w_free: wire %d\n", w->io.fd);
+
+ w->direction = WIRE_FREE;
+ (*w_reply) (w, reply);
+ w->direction = saved_dir;
+
+ if (w->status != 0)
+ DBG (2, "sanei_w_free: error status %d\n", w->status);
+ DBG (4, "sanei_w_free: done\n");
+}
+
+void
+sanei_w_init (Wire * w, void (*codec_init_func) (Wire *))
+{
+ DBG_INIT ();
+
+ DBG (3, "sanei_w_init: initializing\n");
+ w->status = 0;
+ w->direction = WIRE_ENCODE;
+ w->buffer.size = 8192;
+ w->buffer.start = malloc (w->buffer.size);
+
+ if (w->buffer.start == 0)
+ {
+ /* Malloc failed, so return an error. */
+ w->status = ENOMEM;
+ DBG (1, "sanei_w_init: not enough free memory\n");
+ }
+
+ w->buffer.curr = w->buffer.start;
+ w->buffer.end = w->buffer.start + w->buffer.size;
+ if (codec_init_func != 0)
+ {
+ DBG (4, "sanei_w_init: initializing codec\n");
+ (*codec_init_func) (w);
+ }
+ w->allocated_memory = 0;
+ DBG (4, "sanei_w_init: done\n");
+}
+
+void
+sanei_w_exit (Wire * w)
+{
+ DBG (3, "sanei_w_exit: wire %d\n", w->io.fd);
+ if (w->buffer.start)
+ {
+ DBG (4, "sanei_w_exit: freeing buffer\n");
+ free (w->buffer.start);
+ }
+ w->buffer.start = 0;
+ w->buffer.size = 0;
+ DBG (4, "sanei_w_exit: done\n");
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 15:50:59 +0000