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/* Copyright (C) 2010 - 2013 UNISYS CORPORATION
* All rights reserved.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
#ifndef __VBUSDEVICEINFO_H__
#define __VBUSDEVICEINFO_H__
#include <linux/types.h>
#pragma pack(push, 1) /* both GCC and VC now allow this pragma */
/* An array of this struct is present in the channel area for each vbus.
* (See vbuschannel.h.)
* It is filled in by the client side to provide info about the device
* and driver from the client's perspective.
*/
struct ultra_vbus_deviceinfo {
u8 devtype[16]; /* short string identifying the device type */
u8 drvname[16]; /* driver .sys file name */
u8 infostrs[96]; /* sequence of tab-delimited id strings: */
/* <DRIVER_REV> <DRIVER_VERTAG> <DRIVER_COMPILETIME> */
u8 reserved[128]; /* pad size to 256 bytes */
};
#pragma pack(pop)
/* Reads chars from the buffer at <src> for <srcmax> bytes, and writes to
* the buffer at <p>, which is <remain> bytes long, ensuring never to
* overflow the buffer at <p>, using the following rules:
* - printable characters are simply copied from the buffer at <src> to the
* buffer at <p>
* - intervening streaks of non-printable characters in the buffer at <src>
* are replaced with a single space in the buffer at <p>
* Note that we pay no attention to '\0'-termination.
* Returns the number of bytes written to <p>.
*
* Pass <p> == NULL and <remain> == 0 for this special behavior. In this
* case, we simply return the number of bytes that WOULD HAVE been written
* to a buffer at <p>, had it been infinitely big.
*/
static inline int
vbuschannel_sanitize_buffer(char *p, int remain, char *src, int srcmax)
{
int chars = 0;
int nonprintable_streak = 0;
while (srcmax > 0) {
if ((*src >= ' ') && (*src < 0x7f)) {
if (nonprintable_streak) {
if (remain > 0) {
*p = ' ';
p++;
remain--;
chars++;
} else if (p == NULL) {
chars++;
}
nonprintable_streak = 0;
}
if (remain > 0) {
*p = *src;
p++;
remain--;
chars++;
} else if (p == NULL) {
chars++;
}
} else {
nonprintable_streak = 1;
}
src++;
srcmax--;
}
return chars;
}
#define VBUSCHANNEL_ADDACHAR(ch, p, remain, chars) \
do { \
if (remain <= 0) \
break; \
*p = ch; \
p++; chars++; remain--; \
} while (0)
/* Converts the non-negative value at <num> to an ascii decimal string
* at <p>, writing at most <remain> bytes. Note there is NO '\0' termination
* written to <p>.
*
* Returns the number of bytes written to <p>.
*
* Note that we create this function because we need to do this operation in
* an environment-independent way (since we are in a common header file).
*/
static inline int
vbuschannel_itoa(char *p, int remain, int num)
{
int digits = 0;
char s[32];
int i;
if (num == 0) {
/* '0' is a special case */
if (remain <= 0)
return 0;
*p = '0';
return 1;
}
/* form a backwards decimal ascii string in <s> */
while (num > 0) {
if (digits >= (int)sizeof(s))
return 0;
s[digits++] = (num % 10) + '0';
num = num / 10;
}
if (remain < digits) {
/* not enough room left at <p> to hold number, so fill with
* '?' */
for (i = 0; i < remain; i++, p++)
*p = '?';
return remain;
}
/* plug in the decimal ascii string representing the number, by */
/* reversing the string we just built in <s> */
i = digits;
while (i > 0) {
i--;
*p = s[i];
p++;
}
return digits;
}
/* Reads <devInfo>, and converts its contents to a printable string at <p>,
* writing at most <remain> bytes. Note there is NO '\0' termination
* written to <p>.
*
* Pass <devix> >= 0 if you want a device index presented.
*
* Returns the number of bytes written to <p>.
*/
static inline int
vbuschannel_devinfo_to_string(struct ultra_vbus_deviceinfo *devinfo,
char *p, int remain, int devix)
{
char *psrc;
int nsrc, x, i, pad;
int chars = 0;
psrc = &devinfo->devtype[0];
nsrc = sizeof(devinfo->devtype);
if (vbuschannel_sanitize_buffer(NULL, 0, psrc, nsrc) <= 0)
return 0;
/* emit device index */
if (devix >= 0) {
VBUSCHANNEL_ADDACHAR('[', p, remain, chars);
x = vbuschannel_itoa(p, remain, devix);
p += x;
remain -= x;
chars += x;
VBUSCHANNEL_ADDACHAR(']', p, remain, chars);
} else {
VBUSCHANNEL_ADDACHAR(' ', p, remain, chars);
VBUSCHANNEL_ADDACHAR(' ', p, remain, chars);
VBUSCHANNEL_ADDACHAR(' ', p, remain, chars);
}
/* emit device type */
x = vbuschannel_sanitize_buffer(p, remain, psrc, nsrc);
p += x;
remain -= x;
chars += x;
pad = 15 - x; /* pad device type to be exactly 15 chars */
for (i = 0; i < pad; i++)
VBUSCHANNEL_ADDACHAR(' ', p, remain, chars);
VBUSCHANNEL_ADDACHAR(' ', p, remain, chars);
/* emit driver name */
psrc = &devinfo->drvname[0];
nsrc = sizeof(devinfo->drvname);
x = vbuschannel_sanitize_buffer(p, remain, psrc, nsrc);
p += x;
remain -= x;
chars += x;
pad = 15 - x; /* pad driver name to be exactly 15 chars */
for (i = 0; i < pad; i++)
VBUSCHANNEL_ADDACHAR(' ', p, remain, chars);
VBUSCHANNEL_ADDACHAR(' ', p, remain, chars);
/* emit strings */
psrc = &devinfo->infostrs[0];
nsrc = sizeof(devinfo->infostrs);
x = vbuschannel_sanitize_buffer(p, remain, psrc, nsrc);
p += x;
remain -= x;
chars += x;
VBUSCHANNEL_ADDACHAR('\n', p, remain, chars);
return chars;
}
#endif
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