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freebsd/lib/libcam/scsi_cmdparse.c

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/*
* Taken from the original FreeBSD user SCSI library.
*/
/* Copyright (c) 1994 HD Associates
* (contact: dufault@hda.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by HD Associates
* 4. Neither the name of the HD Associaates nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* From: scsi.c,v 1.8 1997/02/22 15:07:54 peter Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <sys/errno.h>
#include <stdarg.h>
#include <fcntl.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/scsi/scsi_message.h>
#include "camlib.h"
/*
* Decode: Decode the data section of a scsireq. This decodes
* trivial grammar:
*
* fields : field fields
* ;
*
* field : field_specifier
* | control
* ;
*
* control : 's' seek_value
* | 's' '+' seek_value
* ;
*
* seek_value : DECIMAL_NUMBER
* | 'v' // For indirect seek, i.e., value from the arg list
* ;
*
* field_specifier : type_specifier field_width
* | '{' NAME '}' type_specifier field_width
* ;
*
* field_width : DECIMAL_NUMBER
* ;
*
* type_specifier : 'i' // Integral types (i1, i2, i3, i4)
* | 'b' // Bits
* | 't' // Bits
* | 'c' // Character arrays
* | 'z' // Character arrays with zeroed trailing spaces
* ;
*
* Notes:
* 1. Integral types are swapped into host order.
* 2. Bit fields are allocated MSB to LSB to match the SCSI spec documentation.
* 3. 's' permits "seeking" in the string. "s+DECIMAL" seeks relative to
* DECIMAL; "sDECIMAL" seeks absolute to decimal.
* 4. 's' permits an indirect reference. "sv" or "s+v" will get the
* next integer value from the arg array.
* 5. Field names can be anything between the braces
*
* BUGS:
* i and b types are promoted to ints.
*
*/
static int
do_buff_decode(u_int8_t *databuf, size_t len,
void (*arg_put)(void *, int , void *, int, char *),
void *puthook, const char *fmt, va_list ap)
{
int assigned = 0;
int width;
int suppress;
int plus;
int done = 0;
static u_char mask[] = {0, 0x01, 0x03, 0x07, 0x0f,
0x1f, 0x3f, 0x7f, 0xff};
int value;
u_char *base = databuf;
char *intendp;
char letter;
char field_name[80];
# define ARG_PUT(ARG) \
do \
{ \
if (!suppress) \
{ \
if (arg_put) \
(*arg_put)(puthook, (letter == 't' ? \
'b' : letter), \
(void *)((long)(ARG)), width, \
field_name); \
else \
*(va_arg(ap, int *)) = (ARG); \
assigned++; \
} \
field_name[0] = 0; \
suppress = 0; \
} while (0)
u_char bits = 0; /* For bit fields */
int shift = 0; /* Bits already shifted out */
suppress = 0;
field_name[0] = 0;
while (!done) {
switch(letter = *fmt) {
case ' ': /* White space */
case '\t':
case '\r':
case '\n':
case '\f':
fmt++;
break;
case '#': /* Comment */
while (*fmt && (*fmt != '\n'))
fmt++;
if (fmt)
fmt++; /* Skip '\n' */
break;
case '*': /* Suppress assignment */
fmt++;
suppress = 1;
break;
case '{': /* Field Name */
{
int i = 0;
fmt++; /* Skip '{' */
while (*fmt && (*fmt != '}')) {
if (i < sizeof(field_name))
field_name[i++] = *fmt;
fmt++;
}
if (fmt)
fmt++; /* Skip '}' */
field_name[i] = 0;
break;
}
case 't': /* Bit (field) */
case 'b': /* Bits */
fmt++;
width = strtol(fmt, &intendp, 10);
fmt = intendp;
if (width > 8)
done = 1;
else {
if (shift <= 0) {
bits = *databuf++;
shift = 8;
}
value = (bits >> (shift - width)) &
mask[width];
#if 0
printf("shift %2d bits %02x value %02x width %2d mask %02x\n",
shift, bits, value, width, mask[width]);
#endif
ARG_PUT(value);
shift -= width;
}
break;
case 'i': /* Integral values */
shift = 0;
fmt++;
width = strtol(fmt, &intendp, 10);
fmt = intendp;
switch(width) {
case 1:
ARG_PUT(*databuf);
databuf++;
break;
case 2:
ARG_PUT((*databuf) << 8 | *(databuf + 1));
databuf += 2;
break;
case 3:
ARG_PUT((*databuf) << 16 |
(*(databuf + 1)) << 8 | *(databuf + 2));
databuf += 3;
break;
case 4:
ARG_PUT((*databuf) << 24 |
(*(databuf + 1)) << 16 |
(*(databuf + 2)) << 8 |
*(databuf + 3));
databuf += 4;
break;
default:
done = 1;
break;
}
break;
case 'c': /* Characters (i.e., not swapped) */
case 'z': /* Characters with zeroed trailing
spaces */
shift = 0;
fmt++;
width = strtol(fmt, &intendp, 10);
fmt = intendp;
if (!suppress) {
if (arg_put)
(*arg_put)(puthook,
(letter == 't' ? 'b' : letter),
databuf, width, field_name);
else {
char *dest;
dest = va_arg(ap, char *);
bcopy(databuf, dest, width);
if (letter == 'z') {
char *p;
for (p = dest + width - 1;
(p >= (char *)dest)
&& (*p == ' '); p--)
*p = 0;
}
}
assigned++;
}
databuf += width;
field_name[0] = 0;
suppress = 0;
break;
case 's': /* Seek */
shift = 0;
fmt++;
if (*fmt == '+') {
plus = 1;
fmt++;
} else
plus = 0;
if (tolower(*fmt) == 'v') {
/*
* You can't suppress a seek value. You also
* can't have a variable seek when you are using
* "arg_put".
*/
width = (arg_put) ? 0 : va_arg(ap, int);
fmt++;
} else {
width = strtol(fmt, &intendp, 10);
fmt = intendp;
}
if (plus)
databuf += width; /* Relative seek */
else
databuf = base + width; /* Absolute seek */
break;
case 0:
done = 1;
break;
default:
fprintf(stderr, "Unknown letter in format: %c\n",
letter);
fmt++;
break;
}
}
return (assigned);
}
/* next_field: Return the next field in a command specifier. This
* builds up a SCSI command using this trivial grammar:
*
* fields : field fields
* ;
*
* field : value
* | value ':' field_width
* ;
*
* field_width : digit
* | 'i' digit // i2 = 2 byte integer, i3 = 3 byte integer etc.
* ;
*
* value : HEX_NUMBER
* | 'v' // For indirection.
* ;
*
* Notes:
* Bit fields are specified MSB first to match the SCSI spec.
*
* Examples:
* TUR: "0 0 0 0 0 0"
* WRITE BUFFER: "38 v:3 0:2 0:3 v v:i3 v:i3 0", mode, buffer_id, list_length
*
* The function returns the value:
* 0: For reached end, with error_p set if an error was found
* 1: For valid stuff setup
* 2: For "v" was entered as the value (implies use varargs)
*
*/
static int
next_field(const char **pp, char *fmt, int *width_p, int *value_p, char *name,
int n_name, int *error_p, int *suppress_p)
{
const char *p = *pp;
char *intendp;
int something = 0;
enum {
BETWEEN_FIELDS,
START_FIELD,
GET_FIELD,
DONE,
} state;
int value = 0;
int field_size; /* Default to byte field type... */
int field_width; /* 1 byte wide */
int is_error = 0;
int suppress = 0;
field_size = 8; /* Default to byte field type... */
*fmt = 'i';
field_width = 1; /* 1 byte wide */
if (name)
*name = 0;
state = BETWEEN_FIELDS;
while (state != DONE) {
switch(state) {
case BETWEEN_FIELDS:
if (*p == 0)
state = DONE;
else if (isspace(*p))
p++;
else if (*p == '#') {
while (*p && *p != '\n')
p++;
if (p)
p++;
} else if (*p == '{') {
int i = 0;
p++;
while (*p && *p != '}') {
if(name && i < n_name) {
name[i] = *p;
i++;
}
p++;
}
if(name && i < n_name)
name[i] = 0;
if (*p == '}')
p++;
} else if (*p == '*') {
p++;
suppress = 1;
} else if (isxdigit(*p)) {
something = 1;
value = strtol(p, &intendp, 16);
p = intendp;
state = START_FIELD;
} else if (tolower(*p) == 'v') {
p++;
something = 2;
value = *value_p;
state = START_FIELD;
} else if (tolower(*p) == 'i') {
/*
* Try to work without the "v".
*/
something = 2;
value = *value_p;
p++;
*fmt = 'i';
field_size = 8;
field_width = strtol(p, &intendp, 10);
p = intendp;
state = DONE;
} else if (tolower(*p) == 't') {
/*
* XXX: B can't work: Sees the 'b' as a
* hex digit in "isxdigit". try "t" for
* bit field.
*/
something = 2;
value = *value_p;
p++;
*fmt = 'b';
field_size = 1;
field_width = strtol(p, &intendp, 10);
p = intendp;
state = DONE;
} else if (tolower(*p) == 's') {
/* Seek */
*fmt = 's';
p++;
if (tolower(*p) == 'v') {
p++;
something = 2;
value = *value_p;
} else {
something = 1;
value = strtol(p, &intendp, 0);
p = intendp;
}
state = DONE;
} else {
fprintf(stderr, "Invalid starting "
"character: %c\n", *p);
is_error = 1;
state = DONE;
}
break;
case START_FIELD:
if (*p == ':') {
p++;
field_size = 1; /* Default to bits
when specified */
state = GET_FIELD;
} else
state = DONE;
break;
case GET_FIELD:
if (isdigit(*p)) {
*fmt = 'b';
field_size = 1;
field_width = strtol(p, &intendp, 10);
p = intendp;
state = DONE;
} else if (*p == 'i') {
/* Integral (bytes) */
p++;
*fmt = 'i';
field_size = 8;
field_width = strtol(p, &intendp, 10);
p = intendp;
state = DONE;
} else if (*p == 'b') {
/* Bits */
p++;
*fmt = 'b';
field_size = 1;
field_width = strtol(p, &intendp, 10);
p = intendp;
state = DONE;
} else {
fprintf(stderr, "Invalid startfield %c "
"(%02x)\n", *p, *p);
is_error = 1;
state = DONE;
}
break;
case DONE:
break;
}
}
if (is_error) {
*error_p = 1;
return 0;
}
*error_p = 0;
*pp = p;
*width_p = field_width * field_size;
*value_p = value;
*suppress_p = suppress;
return (something);
}
static int
do_encode(u_char *buff, size_t vec_max, size_t *used,
int (*arg_get)(void *, char *), void *gethook, const char *fmt,
va_list ap)
{
int ind;
int shift;
u_char val;
int ret;
int width, value, error, suppress;
char c;
int encoded = 0;
char field_name[80];
ind = 0;
shift = 0;
val = 0;
while ((ret = next_field(&fmt, &c, &width, &value, field_name,
sizeof(field_name), &error, &suppress))) {
encoded++;
if (ret == 2) {
if (suppress)
value = 0;
else
value = arg_get ?
(*arg_get)(gethook, field_name) :
va_arg(ap, int);
}
#if 0
printf(
"do_encode: ret %d fmt %c width %d value %d name \"%s\" error %d suppress %d\n",
ret, c, width, value, field_name, error, suppress);
#endif
/* Absolute seek */
if (c == 's') {
ind = value;
continue;
}
/* A width of < 8 is a bit field. */
if (width < 8) {
/* This is a bit field. We start with the high bits
* so it reads the same as the SCSI spec.
*/
shift += width;
val |= (value << (8 - shift));
if (shift == 8) {
if (ind < vec_max) {
buff[ind++] = val;
val = 0;
}
shift = 0;
}
} else {
if (shift) {
if (ind < vec_max) {
buff[ind++] = val;
val = 0;
}
shift = 0;
}
switch(width) {
case 8: /* 1 byte integer */
if (ind < vec_max)
buff[ind++] = value;
break;
case 16: /* 2 byte integer */
if (ind < vec_max - 2 + 1) {
buff[ind++] = value >> 8;
buff[ind++] = value;
}
break;
case 24: /* 3 byte integer */
if (ind < vec_max - 3 + 1) {
buff[ind++] = value >> 16;
buff[ind++] = value >> 8;
buff[ind++] = value;
}
break;
case 32: /* 4 byte integer */
if (ind < vec_max - 4 + 1) {
buff[ind++] = value >> 24;
buff[ind++] = value >> 16;
buff[ind++] = value >> 8;
buff[ind++] = value;
}
break;
default:
fprintf(stderr, "do_encode: Illegal width\n");
break;
}
}
}
/* Flush out any remaining bits
*/
if (shift && ind < vec_max) {
buff[ind++] = val;
val = 0;
}
if (used)
*used = ind;
if (error)
return -1;
return encoded;
}
int
csio_decode(struct ccb_scsiio *csio, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
return(do_buff_decode(csio->data_ptr, (size_t)csio->dxfer_len,
0, 0, fmt, ap));
}
int
csio_decode_visit(struct ccb_scsiio *csio, const char *fmt,
void (*arg_put)(void *, int, void *, int, char *),
void *puthook)
{
va_list ap;
/*
* We need some way to output things; we can't do it without
* the arg_put function.
*/
if (arg_put == NULL)
return(-1);
bzero(&ap, sizeof(ap));
return(do_buff_decode(csio->data_ptr, (size_t)csio->dxfer_len,
arg_put, puthook, fmt, ap));
}
int
buff_decode(u_int8_t *buff, size_t len, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
return(do_buff_decode(buff, len, 0, 0, fmt, ap));
}
int
buff_decode_visit(u_int8_t *buff, size_t len, const char *fmt,
void (*arg_put)(void *, int, void *, int, char *),
void *puthook)
{
va_list ap;
/*
* We need some way to output things; we can't do it without
* the arg_put function.
*/
if (arg_put == NULL)
return(-1);
bzero(&ap, sizeof(ap));
return(do_buff_decode(buff, len, arg_put, puthook, fmt, ap));
}
/*
* Build a SCSI CCB, given the command and data pointers and a format
* string describing the
*/
int
csio_build(struct ccb_scsiio *csio, u_int8_t *data_ptr, u_int32_t dxfer_len,
u_int32_t flags, int retry_count, int timeout, const char *cmd_spec,
...)
{
size_t cmdlen;
int retval;
va_list ap;
if (csio == NULL)
return(0);
bzero(csio, sizeof(struct ccb_scsiio));
va_start(ap, cmd_spec);
if ((retval = do_encode(csio->cdb_io.cdb_bytes, SCSI_MAX_CDBLEN,
&cmdlen, NULL, NULL, cmd_spec, ap)) == -1)
return(retval);
cam_fill_csio(csio,
/* retries */ retry_count,
/* cbfcnp */ NULL,
/* flags */ flags,
/* tag_action */ MSG_SIMPLE_Q_TAG,
/* data_ptr */ data_ptr,
/* dxfer_len */ dxfer_len,
/* sense_len */ SSD_FULL_SIZE,
/* cdb_len */ cmdlen,
/* timeout */ timeout ? timeout : 5000);
return(retval);
}
int
csio_build_visit(struct ccb_scsiio *csio, u_int8_t *data_ptr,
u_int32_t dxfer_len, u_int32_t flags, int retry_count,
int timeout, const char *cmd_spec,
int (*arg_get)(void *hook, char *field_name), void *gethook)
{
va_list ap;
size_t cmdlen;
int retval;
if (csio == NULL)
return(0);
/*
* We need something to encode, but we can't get it without the
* arg_get function.
*/
if (arg_get == NULL)
return(-1);
bzero(&ap, sizeof(ap));
bzero(csio, sizeof(struct ccb_scsiio));
if ((retval = do_encode(csio->cdb_io.cdb_bytes, SCSI_MAX_CDBLEN,
&cmdlen, arg_get, gethook, cmd_spec, ap)) == -1)
return(retval);
cam_fill_csio(csio,
/* retries */ retry_count,
/* cbfcnp */ NULL,
/* flags */ flags,
/* tag_action */ MSG_SIMPLE_Q_TAG,
/* data_ptr */ data_ptr,
/* dxfer_len */ dxfer_len,
/* sense_len */ SSD_FULL_SIZE,
/* cdb_len */ cmdlen,
/* timeout */ timeout ? timeout : 5000);
return(retval);
}
int
csio_encode(struct ccb_scsiio *csio, const char *fmt, ...)
{
va_list ap;
if (csio == NULL)
return(0);
va_start(ap, fmt);
return(do_encode(csio->data_ptr, csio->dxfer_len, 0, 0, 0, fmt, ap));
}
int
buff_encode_visit(u_int8_t *buff, size_t len, const char *fmt,
int (*arg_get)(void *hook, char *field_name), void *gethook)
{
va_list ap;
/*
* We need something to encode, but we can't get it without the
* arg_get function.
*/
if (arg_get == NULL)
return(-1);
bzero(&ap, sizeof(ap));
return(do_encode(buff, len, 0, arg_get, gethook, fmt, ap));
}
int
csio_encode_visit(struct ccb_scsiio *csio, const char *fmt,
int (*arg_get)(void *hook, char *field_name), void *gethook)
{
va_list ap;
/*
* We need something to encode, but we can't get it without the
* arg_get function.
*/
if (arg_get == NULL)
return(-1);
bzero(&ap, sizeof(ap));
return(do_encode(csio->data_ptr, csio->dxfer_len, 0, arg_get,
gethook, fmt, ap));
}
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