/usr/src/sbin/scsi/libscsi.c

Bug Summary

File:	src/sbin/scsi/libscsi.c
Warning:	line 479, column 12 Assigned value is garbage or undefined
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name libscsi.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/sbin/scsi/obj -resource-dir /usr/local/lib/clang/13.0.0 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/sbin/scsi/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/sbin/scsi/libscsi.c
1/*	$OpenBSD: libscsi.c,v 1.11 2016/01/28 17:26:10 gsoares Exp $	*/

3/* 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.
*
*	$FreeBSD: scsi.c,v 1.6 1995/05/30 05:47:26 rgrimes Exp $
*/
36#include <stdlib.h>
37#include <stdio.h>
38#include <ctype.h>
39#include <string.h>
40#include <sys/scsiio.h>
41#include <errno(*__errno()).h>
42#include <stdarg.h>
43#include <fcntl.h>

45#include "libscsi.h"

47static struct {
FILE	*db_f;
int	db_level;
int	db_trunc;
51} behave;

53/* scsireq_reset: Reset a scsireq structure.
*/
55scsireq_t *
56scsireq_reset(scsireq_t *scsireq)
57{
if (scsireq == 0)
return scsireq;

scsireq->flags = 0;		/* info about the request status and type */
scsireq->timeout = 2000;	/* 2 seconds */
bzero(scsireq->cmd, sizeof(scsireq->cmd));
scsireq->cmdlen = 0;
/* Leave scsireq->databuf alone */
/* Leave scsireq->datalen alone */
scsireq->datalen_used = 0;
bzero(scsireq->sense, sizeof(scsireq->sense));
scsireq->senselen = sizeof(scsireq->sense);
scsireq->senselen_used = 0;
scsireq->status = 0;
scsireq->retsts = 0;
scsireq->error = 0;

return scsireq;
76}

78/* scsireq_new: Allocate and initialize a new scsireq.
*/
80scsireq_t *
81scsireq_new(void)
82{
scsireq_t *p = malloc(sizeof(scsireq_t));

if (p)
scsireq_reset(p);

return p;
89}

91/*
* 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.
*
*/
137static int
138do_buff_decode(u_char *databuf, size_t len,
  void (*arg_put)(void *, int , void *, int, char *),
  void *puthook, char *fmt, va_list ap)
141{
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 letter;
char field_name[80];

153#	define ARG_PUT(ARG)do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)(ARG)), 1, field_name
); else *(__builtin_va_arg(ap, int *)) = (ARG); assigned++; }
 field_name[0] = 0; suppress = 0; } while (0) \
do \
{ \
if (!suppress) { \
	if (arg_put) \
		(*arg_put)(puthook, (letter == 't' ? 'b' : letter), \
		    (void *)((long)(ARG)), 1, field_name); \
	else \
		*(va_arg(ap, int *)__builtin_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)-1)
				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, &fmt, 10);
	if (width > 8)
		done = 1;
	else {
		if (shift <= 0) {
			bits = *databuf++;
			shift = 8;
		}
		value = (bits >> (shift - width)) & mask[width];

224#if 0
		printf("shift %2d bits %02x value %02x width %2d mask %02x\n",
		    shift, bits, value, width, mask[width]);
227#endif

		ARG_PUT(value)do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)(value)), 1, field_name
); else *(__builtin_va_arg(ap, int *)) = (value); assigned++;
 } field_name[0] = 0; suppress = 0; } while (0);

		shift -= width;
	}

	break;

case 'i':	/* Integral values */
	shift = 0;
	fmt++;
	width = strtol(fmt, &fmt, 10);
	switch (width) {
	case 1:
		ARG_PUT(*databuf)do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)(*databuf)), 1, field_name
); else *(__builtin_va_arg(ap, int *)) = (*databuf); assigned
++; } field_name[0] = 0; suppress = 0; } while (0);
		databuf++;
		break;

	case 2:
		ARG_PUT((*databuf) << 8 | *(databuf + 1))do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 8
 | *(databuf + 1))), 1, field_name); else *(__builtin_va_arg(
ap, int *)) = ((*databuf) << 8 | *(databuf + 1)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0);
		databuf += 2;
		break;

	case 3:
		ARG_PUT(do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 16
 | (*(databuf + 1)) << 8 | *(databuf + 2))), 1, field_name
); else *(__builtin_va_arg(ap, int *)) = ((*databuf) <<
| (*(databuf + 1)) << 8 | *(databuf + 2)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0)
		    (*databuf) << 16 |do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 16
 | (*(databuf + 1)) << 8 | *(databuf + 2))), 1, field_name
); else *(__builtin_va_arg(ap, int *)) = ((*databuf) <<
| (*(databuf + 1)) << 8 | *(databuf + 2)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0)
		    (*(databuf + 1)) << 8 |do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 16
 | (*(databuf + 1)) << 8 | *(databuf + 2))), 1, field_name
); else *(__builtin_va_arg(ap, int *)) = ((*databuf) <<
| (*(databuf + 1)) << 8 | *(databuf + 2)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0)
		    *(databuf + 2))do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 16
 | (*(databuf + 1)) << 8 | *(databuf + 2))), 1, field_name
); else *(__builtin_va_arg(ap, int *)) = ((*databuf) <<
| (*(databuf + 1)) << 8 | *(databuf + 2)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0);
		databuf += 3;
		break;

	case 4:
		ARG_PUT(do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 24
 | (*(databuf + 1)) << 16 | (*(databuf + 2)) << 8
 | *(databuf + 3))), 1, field_name); else *(__builtin_va_arg(
ap, int *)) = ((*databuf) << 24 | (*(databuf + 1)) <<
| (*(databuf + 2)) << 8 | *(databuf + 3)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0)
		    (*databuf) << 24 |do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 24
 | (*(databuf + 1)) << 16 | (*(databuf + 2)) << 8
 | *(databuf + 3))), 1, field_name); else *(__builtin_va_arg(
ap, int *)) = ((*databuf) << 24 | (*(databuf + 1)) <<
| (*(databuf + 2)) << 8 | *(databuf + 3)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0)
		    (*(databuf + 1)) << 16 |do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 24
 | (*(databuf + 1)) << 16 | (*(databuf + 2)) << 8
 | *(databuf + 3))), 1, field_name); else *(__builtin_va_arg(
ap, int *)) = ((*databuf) << 24 | (*(databuf + 1)) <<
| (*(databuf + 2)) << 8 | *(databuf + 3)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0)
		    (*(databuf + 2)) << 8 |do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 24
 | (*(databuf + 1)) << 16 | (*(databuf + 2)) << 8
 | *(databuf + 3))), 1, field_name); else *(__builtin_va_arg(
ap, int *)) = ((*databuf) << 24 | (*(databuf + 1)) <<
| (*(databuf + 2)) << 8 | *(databuf + 3)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0)
		    *(databuf + 3))do { if (!suppress) { if (arg_put) (*arg_put)(puthook, (letter
 == 't' ? 'b' : letter), (void *)((long)((*databuf) << 24
 | (*(databuf + 1)) << 16 | (*(databuf + 2)) << 8
 | *(databuf + 3))), 1, field_name); else *(__builtin_va_arg(
ap, int *)) = ((*databuf) << 24 | (*(databuf + 1)) <<
| (*(databuf + 2)) << 8 | *(databuf + 3)); assigned
++; } field_name[0] = 0; suppress = 0; } while (0);
		databuf += 4;
		break;

		default:
		done = 1;
	}

	break;

case 'c':	/* Characters (i.e., not swapped) */
case 'z':	/* Characters with zeroed trailing spaces  */
	shift = 0;
	fmt++;
	width = strtol(fmt, &fmt, 10);
	if (!suppress) {
		if (arg_put)
			(*arg_put)(puthook, (letter == 't' ? 'b' : letter),
			    databuf, width, field_name);
		else {
			char *dest;
			dest = va_arg(ap, char *)__builtin_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((unsigned char)*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)__builtin_va_arg(ap, int);
		fmt++;
	} else
		width = strtol(fmt, &fmt, 10);

	if (plus)
		databuf += width;	/* Relative seek */
	else
		databuf = base + width;	/* Absolute seek */

	break;

case 0:
	done = 1;
	break;

default:
	fprintf(stderr(&__sF[2]), "Unknown letter in format: %c\n", letter);
	fmt++;
}
}

return assigned;
338}

340int
341scsireq_decode_visit(scsireq_t *scsireq, char *fmt,
  void (*arg_put)(void *, int , void *, int, char *), void *puthook)
343{
va_list ap;
int ret;

ret = do_buff_decode(scsireq->databuf, (size_t)scsireq->datalen,
   arg_put, puthook, fmt, ap);
va_end (ap)__builtin_va_end(ap);
return (ret);
351}

353int
354scsireq_buff_decode_visit(u_char *buff, size_t len, char *fmt,
  void (*arg_put)(void *, int, void *, int, char *), void *puthook)
356{
va_list ap;

/* XXX */
return do_buff_decode(buff, len, arg_put, puthook, fmt, ap);
361}

363/* 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)
*
*/
394static int
395next_field(char **pp, char *fmt, int *width_p, int *value_p, char *name,
  int n_name, int *error_p, int *suppress_p)
397{
char *p = *pp;

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 (name3.1
'name' is non-null
)
4
←
Taking true branch→
*name = 0;

state = BETWEEN_FIELDS;

while (state != DONE)
5
←
Loop condition is true.  Entering loop body→
switch (state)
6
←
Control jumps to 'case BETWEEN_FIELDS:'  at line 421→
{
case BETWEEN_FIELDS:
	if (*p == 0)
7
←
Assuming the condition is false→
8
←
Taking false branch→
		state = DONE;
	else if (isspace((unsigned char)*p))
9
←
Taking false branch→
		p++;
	else if (*p == '#') {
10
←
Assuming the condition is false→
11
←
Taking false branch→
		while (*p && *p != '\n')
			p++;

		if (p)
			p++;
		} else if (*p == '{') {
12
←
Assuming the condition is false→
13
←
Taking false branch→
			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 == '*') {
14
←
Assuming the condition is false→
15
←
Taking false branch→
			p++;
			suppress = 1;
		} else if (isxdigit((unsigned char)*p)) {
16
←
Taking false branch→
			something = 1;
			value = strtol(p, &p, 16);
			state = START_FIELD;
		} else if (tolower((unsigned char)*p) == 'v') {
17
←
Assuming the condition is false→
18
←
Taking false branch→
			p++;
			something = 2;
			value = *value_p;
			state = START_FIELD;
		}
		/* try to work without the 'v' */
		else if (tolower((unsigned char)*p) == 'i') {
19
←
Assuming the condition is false→
20
←
Taking false branch→
			something = 2;
			value = *value_p;
			p++;

			*fmt = 'i';
			field_size = 8;
			field_width = strtol(p, &p, 10);
			state = DONE;
		} else if (tolower((unsigned char)*p) == 't') {
21
←
Assuming the condition is true→
22
←
Taking true branch→
			/* XXX: B can't work: Sees the 'b'
			 * as a hex digit in "isxdigit".
			 * try "t" for bit field.
			 */
			something = 2;
			value = *value_p;
23
←
Assigned value is garbage or undefined
			p++;

			*fmt = 'b';
			field_size = 1;
			field_width = strtol(p, &p, 10);
			state = DONE;
		} else if (tolower((unsigned char)*p) == 's') { /* Seek */
			*fmt = 's';
			p++;
			if (tolower((unsigned char)*p) == 'v') {
				p++;
				something = 2;
				value = *value_p;
			} else {
				something = 1;
				value = strtol(p, &p, 0);
			}
			state = DONE;
		} else {
			fprintf(stderr(&__sF[2]), "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((unsigned char)*p)) {
		*fmt = 'b';
		field_size = 1;
		field_width = strtol(p, &p, 10);
		state = DONE;
	} else if (*p == 'i') {	/* Integral (bytes) */
		p++;

		*fmt = 'i';
		field_size = 8;
		field_width = strtol(p, &p, 10);
		state = DONE;
	} else if (*p == 'b') {	/* Bits */
		p++;

		*fmt = 'b';
		field_size = 1;
		field_width = strtol(p, &p, 10);
		state = DONE;
	} else {
		fprintf(stderr(&__sF[2]), "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;
558}

560static int
561do_encode(u_char *buff, size_t vec_max, size_t *used,
  int (*arg_get)(void *, char *),
  void *gethook, char *fmt, va_list ap)
564{
int ind;
int shift;
u_char val;
int ret;
int width, value, error, suppress;
2
←
'value' declared without an initial value→
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,
3
←
Calling 'next_field'→
   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)__builtin_va_arg(ap, int);
}

590#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);
595#endif

if (c == 's')	/* Absolute seek */
{
	ind = value;
	continue;
}

if (width < 8)	/* A width of < 8 is a bit field. */
{

	/* 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(&__sF[2]), "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;
681}

683scsireq_t *
684scsireq_build(scsireq_t *scsireq, u_long datalen, caddr_t databuf,
  u_long flags, char *cmd_spec, ...)
686{
size_t cmdlen;
va_list ap;

if (scsireq == 0)
return 0;

scsireq_reset(scsireq);

if (databuf) {
scsireq->databuf = databuf;
scsireq->datalen = datalen;
scsireq->flags = flags;
}
else if (datalen) {
/* XXX: Good way to get a memory leak.  Perhaps this should be
 * removed.
 */
if ( (scsireq->databuf = malloc(datalen)) == NULL((void *)0))
	return 0;

scsireq->datalen = datalen;
scsireq->flags = flags;
}

va_start(ap, cmd_spec)__builtin_va_start(ap, cmd_spec);

if (do_encode(scsireq->cmd, CMDBUFLEN16, &cmdlen, 0, 0, cmd_spec, ap) == -1)
	return 0;
va_end (ap)__builtin_va_end(ap);

scsireq->cmdlen = cmdlen;
return scsireq;
719}

721scsireq_t
722*scsireq_build_visit(scsireq_t *scsireq, u_long datalen, caddr_t databuf,
  u_long flags, char *cmd_spec,
  int (*arg_get)(void *hook, char *field_name), void *gethook)
725{
size_t cmdlen;
va_list ap;

if (scsireq == 0)
return 0;

scsireq_reset(scsireq);

if (databuf) {
scsireq->databuf = databuf;
scsireq->datalen = datalen;
scsireq->flags = flags;
} else if (datalen) {
/* XXX: Good way to get a memory leak.  Perhaps this should be
 * removed.
 */
if ( (scsireq->databuf = malloc(datalen)) == NULL((void *)0))
	return 0;

scsireq->datalen = datalen;
scsireq->flags = flags;
}

if (do_encode(scsireq->cmd, CMDBUFLEN16, &cmdlen, arg_get, gethook,
   cmd_spec, ap) == -1)
	return 0;

scsireq->cmdlen = cmdlen;

return scsireq;
756}

758int
759scsireq_buff_encode_visit(u_char *buff, size_t len, char *fmt,
int (*arg_get)(void *hook, char *field_name), void *gethook)
761{
va_list ap;
return do_encode(buff, len, 0, arg_get, gethook, fmt, ap);
764}

766int
767scsireq_encode_visit(scsireq_t *scsireq, char *fmt,
  int (*arg_get)(void *hook, char *field_name), void *gethook)
769{
va_list ap;
return do_encode(scsireq->databuf, scsireq->datalen, 0,
1
Calling 'do_encode'→
   arg_get, gethook, fmt, ap);
773}

775FILE *
776scsi_debug_output(char *s)
777{
if (s == 0)
behave.db_f = 0;
else {
behave.db_f = fopen(s, "w");

if (behave.db_f == 0)
	behave.db_f = stderr(&__sF[2]);
}

return behave.db_f;
788}

790#define SCSI_TRUNCATE-1 -1

792typedef struct scsi_assoc {
int code;
char *text;
795} scsi_assoc_t;

797static scsi_assoc_t retsts[] =
798{
{ SCCMD_OK0x00, "No error" },
{ SCCMD_TIMEOUT0x01, "Command Timeout" },
{ SCCMD_BUSY0x02, "Busy" },
{ SCCMD_SENSE0x03, "Sense Returned" },
{ SCCMD_UNKNOWN0x04, "Unknown return status" },

{ 0, 0 }
806};

808static char *
809scsi_assoc_text(int code, scsi_assoc_t *tab)
810{
while (tab->text) {
if (tab->code == code)
	return tab->text;

tab++;
}

return "Unknown code";
819}

821void
822scsi_dump(FILE *f, char *text, u_char *p, int req, int got, int dump_print)
823{
int i;
int trunc = 0;

if (f == 0 || req == 0)
return;

fprintf(f, "%s (%d of %d):\n", text, got, req);

if (behave.db_trunc != -1 && got > behave.db_trunc) {
trunc = 1;
got = behave.db_trunc;
}

for (i = 0; i < got; i++) {
fprintf(f, "%02x", p[i]);

putc(' ', f)(!__isthreaded ? __sputc(' ', f) : (putc)(' ', f));

if ((i % 16) == 15 || i == got - 1) {
	int j;
	if (dump_print) {
		fprintf(f, " # ");
		for (j = i - 15; j <= i; j++)
			putc((isprint(p[j]) ? p[j] : '.'), f)(!__isthreaded ? __sputc((isprint(p[j]) ? p[j] : '.'), f) : (
putc)((isprint(p[j]) ? p[j] : '.'), f));

		putc('\n', f)(!__isthreaded ? __sputc('\n', f) : (putc)('\n', f));
	} else
		putc('\n', f)(!__isthreaded ? __sputc('\n', f) : (putc)('\n', f));
}
}

fprintf(f, "%s", (trunc) ? "(truncated)...\n" : "\n");
856}

858/* XXX: sense_7x_dump and scsi_sense dump was just sort of
* grabbed out of the old ds
* library and not really merged in carefully.  It should use the
* new buffer decoding stuff.
*/

864/* Get unsigned long.
*/
866static u_long
867g_u_long(u_char *s)
868{
return (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3];
870}

872/* In the old software you could patch in a special error table:
*/
874static scsi_assoc_t *error_table = 0;

876static void
877sense_7x_dump(FILE *f, scsireq_t *scsireq)
878{
int code;
u_char *s = (u_char *)scsireq->sense;
int valid = (*s) & 0x80;
u_long val;

static scsi_assoc_t sense[] = {
{ 0, "No sense" },
{ 1, "Recovered error" },
{ 2, "Not Ready" },
{ 3, "Medium error" },
{ 4, "Hardware error" },
{ 5, "Illegal request" },
{ 6, "Unit attention" },
{ 7, "Data protect" },
{ 8, "Blank check" },
{ 9, "Vendor specific" },
{ 0xa, "Copy aborted" },
{ 0xb, "Aborted Command" },
{ 0xc, "Equal" },
{ 0xd, "Volume overflow" },
{ 0xe, "Miscompare" },
{ 0, 0 },
};

static scsi_assoc_t code_tab[] = {
{0x70, "current errors"},
{0x71, "deferred errors"},
};

fprintf(f, "Error code is \"%s\"\n", scsi_assoc_text(s[0]&0x7F, code_tab));
fprintf(f, "Segment number is %02x\n", s[1]);

if (s[2] & 0x20)
fprintf(f, "Incorrect Length Indicator is set.\n");

fprintf(f, "Sense key is \"%s\"\n", scsi_assoc_text(s[2] & 0x7, sense));

val = g_u_long(s + 3);
fprintf(f, "The Information field is%s %08lx (%ld).\n",
   valid ? "" : " not valid but contains", (long)val, (long)val);

val = g_u_long(s + 8);
fprintf(f, "The Command Specific Information field is %08lx (%ld).\n",
   (long)val, (long)val);

fprintf(f, "Additional sense code: %02x\n", s[12]);
fprintf(f, "Additional sense code qualifier: %02x\n", s[13]);

code = (s[12] << 8) | s[13];

if (error_table)
fprintf(f, "%s\n", scsi_assoc_text(code, error_table));

if (s[15] & 0x80) {
if ((s[2] & 0x7) == 0x05)	/* Illegal request */
{
	int byte;
	u_char value, bit;
	int bad_par = ((s[15] & 0x40) == 0);
	fprintf(f, "Illegal value in the %s.\n",
	    (bad_par ? "parameter list" : "command descriptor block"));
	byte = ((s[16] << 8) | s[17]);
	value = bad_par ? (u_char)scsireq->databuf[byte] : (u_char)scsireq->cmd[byte];
	bit = s[15] & 0x7;
	if (s[15] & 0x08)
		fprintf(f, "Bit %d of byte %d (value %02x) is illegal.\n",
		    bit, byte, value);
	else
		fprintf(f, "Byte %d (value %02x) is illegal.\n", byte, value);
} else 	{
	fprintf(f, "Sense Key Specific (valid but not illegal request):\n");
	fprintf(f, "%02x %02x %02x\n", s[15] & 0x7f, s[16], s[17]);
}
}
953}

955/* scsi_sense_dump: Dump the sense portion of the scsireq structure.
*/
957static void
958scsi_sense_dump(FILE *f, scsireq_t *scsireq)
959{
u_char *s = (u_char *)scsireq->sense;
int code = (*s) & 0x7f;

if (scsireq->senselen_used == 0) {
fprintf(f, "No sense sent.\n");
return;
}

968#if 0
if (!valid)
fprintf(f, "The sense data is not valid.\n");
971#endif

switch (code) {
case 0x70:
case 0x71:
sense_7x_dump(f, scsireq);
break;

default:
fprintf(f, "No sense dump for error code %02x.\n", code);
}
scsi_dump(f, "sense", s, scsireq->senselen, scsireq->senselen_used, 0);
983}

985static void
986scsi_retsts_dump(FILE *f, scsireq_t *scsireq)
987{
if (scsireq->retsts == 0)
return;

fprintf(f, "return status %d (%s)",
   scsireq->retsts, scsi_assoc_text(scsireq->retsts, retsts));

switch (scsireq->retsts) {
case SCCMD_TIMEOUT0x01:
fprintf(f, " after %ld ms", scsireq->timeout);
break;

default:
break;
}
1002}

1004int
1005scsi_debug(FILE *f, int ret, scsireq_t *scsireq)
1006{
char *d;
if (f == 0)
return 0;

fprintf(f, "SCIOCCOMMAND ioctl");

if (ret == 0)
fprintf(f, ": Command accepted.");
else {
if (ret != -1)
	fprintf(f, ", return value %d?", ret);

if (errno(*__errno())) {
	fprintf(f, ": %s", strerror(errno(*__errno())));
	errno(*__errno()) = 0;
}
}

fputc('\n', f);

if (ret == 0 && (scsireq->status || scsireq->retsts || behave.db_level))
{
scsi_retsts_dump(f, scsireq);

if (scsireq->status)
	fprintf(f, " host adapter status %d\n", scsireq->status);

if (scsireq->flags & SCCMD_READ0x00000001)
	d = "Data in";
else if (scsireq->flags & SCCMD_WRITE0x00000002)
	d = "Data out";
else
	d = "No data transfer?";

if (scsireq->cmdlen == 0)
	fprintf(f, "Zero length command????\n");

scsi_dump(f, "Command out",
    (u_char *)scsireq->cmd, scsireq->cmdlen, scsireq->cmdlen, 0);
scsi_dump(f, d,
    (u_char *)scsireq->databuf, scsireq->datalen,
	scsireq->datalen_used, 1);
scsi_sense_dump(f, scsireq);
}

fflush(f);

return ret;
1055}

1057static char *debug_output;

1059int
1060scsi_open(const char *path, int flags)
1061{
int fd = open(path, flags);

if (fd != -1) {
char *p;
debug_output = getenv("SU_DEBUG_OUTPUT");
(void)scsi_debug_output(debug_output);

if ((p = getenv("SU_DEBUG_LEVEL")))
	sscanf(p, "%d", &behave.db_level);

if ((p = getenv("SU_DEBUG_TRUNCATE")))
	sscanf(p, "%d", &behave.db_trunc);
else
	behave.db_trunc = SCSI_TRUNCATE-1;
}

return fd;
1079}

1081int
1082scsireq_enter(int fid, scsireq_t *scsireq)
1083{
int ret;

ret = ioctl(fid, SCIOCCOMMAND(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof
(scsireq_t) & 0x1fff) << 16) | ((('Q')) << 8)
 | ((1))), (void *)scsireq);

if (behave.db_f)
scsi_debug(behave.db_f, ret, scsireq);

return ret;
1092}