linux-imx

/*

 * Copyright (C) 2016 Red Hat

 *

 * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.

 *

 * Authors:

 * Rob Clark <robdclark@gmail.com>

 */

​

#define DEBUG /* for pr_debug() */

​

#include <stdarg.h>

#include <linux/seq_file.h>

#include <drm/drmP.h>

#include <drm/drm_print.h>

​

void __drm_puts_coredump(struct drm_printer *p, const char *str)

{

    struct drm_print_iterator *iterator = p->arg;

    ssize_t len;

​

    if (!iterator->remain)

        return;

​

    if (iterator->offset < iterator->start) {

        ssize_t copy;

​

        len = strlen(str);

​

        if (iterator->offset + len <= iterator->start) {

            iterator->offset += len;

            return;

        }

​

        copy = len - (iterator->start - iterator->offset);

​

        if (copy > iterator->remain)

            copy = iterator->remain;

​

        /* Copy out the bit of the string that we need */

        memcpy(iterator->data,

            str + (iterator->start - iterator->offset), copy);

​

        iterator->offset = iterator->start + copy;

        iterator->remain -= copy;

    } else {

        ssize_t pos = iterator->offset - iterator->start;