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openssh/openbsd-compat/bsd-snprintf.c
Damien Miller 10479cc2a4 Many typo fixes from Karsten Weiss 
Spotted using https://github.com/lucasdemarchi/codespell
2018-04-10 10:19:02 +10:00

881 lines
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/*
* Copyright Patrick Powell 1995
* This code is based on code written by Patrick Powell (papowell@astart.com)
* It may be used for any purpose as long as this notice remains intact
* on all source code distributions
*/
/**************************************************************
* Original:
* Patrick Powell Tue Apr 11 09:48:21 PDT 1995
* A bombproof version of doprnt (dopr) included.
* Sigh. This sort of thing is always nasty do deal with. Note that
* the version here does not include floating point...
*
* snprintf() is used instead of sprintf() as it does limit checks
* for string length. This covers a nasty loophole.
*
* The other functions are there to prevent NULL pointers from
* causing nast effects.
*
* More Recently:
* Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
* This was ugly. It is still ugly. I opted out of floating point
* numbers, but the formatter understands just about everything
* from the normal C string format, at least as far as I can tell from
* the Solaris 2.5 printf(3S) man page.
*
* Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
* Ok, added some minimal floating point support, which means this
* probably requires libm on most operating systems. Don't yet
* support the exponent (e,E) and sigfig (g,G). Also, fmtint()
* was pretty badly broken, it just wasn't being exercised in ways
* which showed it, so that's been fixed. Also, formatted the code
* to mutt conventions, and removed dead code left over from the
* original. Also, there is now a builtin-test, just compile with:
* gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
* and run snprintf for results.
*
* Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
* The PGP code was using unsigned hexadecimal formats.
* Unfortunately, unsigned formats simply didn't work.
*
* Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
* The original code assumed that both snprintf() and vsnprintf() were
* missing. Some systems only have snprintf() but not vsnprintf(), so
* the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
*
* Andrew Tridgell (tridge@samba.org) Oct 1998
* fixed handling of %.0f
* added test for HAVE_LONG_DOUBLE
*
* tridge@samba.org, idra@samba.org, April 2001
* got rid of fcvt code (twas buggy and made testing harder)
* added C99 semantics
*
* date: 2002/12/19 19:56:31; author: herb; state: Exp; lines: +2 -0
* actually print args for %g and %e
*
* date: 2002/06/03 13:37:52; author: jmcd; state: Exp; lines: +8 -0
* Since includes.h isn't included here, VA_COPY has to be defined here. I don't
* see any include file that is guaranteed to be here, so I'm defining it
* locally. Fixes AIX and Solaris builds.
*
* date: 2002/06/03 03:07:24; author: tridge; state: Exp; lines: +5 -13
* put the ifdef for HAVE_VA_COPY in one place rather than in lots of
* functions
*
* date: 2002/05/17 14:51:22; author: jmcd; state: Exp; lines: +21 -4
* Fix usage of va_list passed as an arg. Use __va_copy before using it
* when it exists.
*
* date: 2002/04/16 22:38:04; author: idra; state: Exp; lines: +20 -14
* Fix incorrect zpadlen handling in fmtfp.
* Thanks to Ollie Oldham <ollie.oldham@metro-optix.com> for spotting it.
* few mods to make it easier to compile the tests.
* addedd the "Ollie" test to the floating point ones.
*
* Martin Pool (mbp@samba.org) April 2003
* Remove NO_CONFIG_H so that the test case can be built within a source
* tree with less trouble.
* Remove unnecessary SAFE_FREE() definition.
*
* Martin Pool (mbp@samba.org) May 2003
* Put in a prototype for dummy_snprintf() to quiet compiler warnings.
*
* Move #endif to make sure VA_COPY, LDOUBLE, etc are defined even
* if the C library has some snprintf functions already.
*
* Damien Miller (djm@mindrot.org) Jan 2007
* Fix integer overflows in return value.
* Make formatting quite a bit faster by inlining dopr_outch()
*
**************************************************************/
#include "includes.h"
#if defined(BROKEN_SNPRINTF) /* For those with broken snprintf() */
# undef HAVE_SNPRINTF
# undef HAVE_VSNPRINTF
#endif
#if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
#include <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#ifdef HAVE_LONG_DOUBLE
# define LDOUBLE long double
#else
# define LDOUBLE double
#endif
#ifdef HAVE_LONG_LONG
# define LLONG long long
#else
# define LLONG long
#endif
/*
* dopr(): poor man's version of doprintf
*/
/* format read states */
#define DP_S_DEFAULT 0
#define DP_S_FLAGS 1
#define DP_S_MIN 2
#define DP_S_DOT 3
#define DP_S_MAX 4
#define DP_S_MOD 5
#define DP_S_CONV 6
#define DP_S_DONE 7
/* format flags - Bits */
#define DP_F_MINUS (1 << 0)
#define DP_F_PLUS (1 << 1)
#define DP_F_SPACE (1 << 2)
#define DP_F_NUM (1 << 3)
#define DP_F_ZERO (1 << 4)
#define DP_F_UP (1 << 5)
#define DP_F_UNSIGNED (1 << 6)
/* Conversion Flags */
#define DP_C_SHORT 1
#define DP_C_LONG 2
#define DP_C_LDOUBLE 3
#define DP_C_LLONG 4
#define DP_C_SIZE 5
#define DP_C_INTMAX 6
#define char_to_int(p) ((p)- '0')
#ifndef MAX
# define MAX(p,q) (((p) >= (q)) ? (p) : (q))
#endif
#define DOPR_OUTCH(buf, pos, buflen, thechar) \
do { \
if (pos + 1 >= INT_MAX) { \
errno = ERANGE; \
return -1; \
} \
if (pos < buflen) \
buf[pos] = thechar; \
(pos)++; \
} while (0)
static int dopr(char *buffer, size_t maxlen, const char *format,
va_list args_in);
static int fmtstr(char *buffer, size_t *currlen, size_t maxlen,
char *value, int flags, int min, int max);
static int fmtint(char *buffer, size_t *currlen, size_t maxlen,
intmax_t value, int base, int min, int max, int flags);
static int fmtfp(char *buffer, size_t *currlen, size_t maxlen,
LDOUBLE fvalue, int min, int max, int flags);
static int
dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
{
char ch;
intmax_t value;
LDOUBLE fvalue;
char *strvalue;
int min;
int max;
int state;
int flags;
int cflags;
size_t currlen;
va_list args;
VA_COPY(args, args_in);
state = DP_S_DEFAULT;
currlen = flags = cflags = min = 0;
max = -1;
ch = *format++;
while (state != DP_S_DONE) {
if (ch == '\0')
state = DP_S_DONE;
switch(state) {
case DP_S_DEFAULT:
if (ch == '%')
state = DP_S_FLAGS;
else
DOPR_OUTCH(buffer, currlen, maxlen, ch);
ch = *format++;
break;
case DP_S_FLAGS:
switch (ch) {
case '-':
flags |= DP_F_MINUS;
ch = *format++;
break;
case '+':
flags |= DP_F_PLUS;
ch = *format++;
break;
case ' ':
flags |= DP_F_SPACE;
ch = *format++;
break;
case '#':
flags |= DP_F_NUM;
ch = *format++;
break;
case '0':
flags |= DP_F_ZERO;
ch = *format++;
break;
default:
state = DP_S_MIN;
break;
}
break;
case DP_S_MIN:
if (isdigit((unsigned char)ch)) {
min = 10*min + char_to_int (ch);
ch = *format++;
} else if (ch == '*') {
min = va_arg (args, int);
ch = *format++;
state = DP_S_DOT;
} else {
state = DP_S_DOT;
}
break;
case DP_S_DOT:
if (ch == '.') {
state = DP_S_MAX;
ch = *format++;
} else {
state = DP_S_MOD;
}
break;
case DP_S_MAX:
if (isdigit((unsigned char)ch)) {
if (max < 0)
max = 0;
max = 10*max + char_to_int (ch);
ch = *format++;
} else if (ch == '*') {
max = va_arg (args, int);
ch = *format++;
state = DP_S_MOD;
} else {
state = DP_S_MOD;
}
break;
case DP_S_MOD:
switch (ch) {
case 'h':
cflags = DP_C_SHORT;
ch = *format++;
break;
case 'j':
cflags = DP_C_INTMAX;
ch = *format++;
break;
case 'l':
cflags = DP_C_LONG;
ch = *format++;
if (ch == 'l') { /* It's a long long */
cflags = DP_C_LLONG;
ch = *format++;
}
break;
case 'L':
cflags = DP_C_LDOUBLE;
ch = *format++;
break;
case 'z':
cflags = DP_C_SIZE;
ch = *format++;
break;
default:
break;
}
state = DP_S_CONV;
break;
case DP_S_CONV:
switch (ch) {
case 'd':
case 'i':
if (cflags == DP_C_SHORT)
value = va_arg (args, int);
else if (cflags == DP_C_LONG)
value = va_arg (args, long int);
else if (cflags == DP_C_LLONG)
value = va_arg (args, LLONG);
else if (cflags == DP_C_SIZE)
value = va_arg (args, ssize_t);
else if (cflags == DP_C_INTMAX)
value = va_arg (args, intmax_t);
else
value = va_arg (args, int);
if (fmtint(buffer, &currlen, maxlen,
value, 10, min, max, flags) == -1)
return -1;
break;
case 'o':
flags |= DP_F_UNSIGNED;
if (cflags == DP_C_SHORT)
value = va_arg (args, unsigned int);
else if (cflags == DP_C_LONG)
value = (long)va_arg (args, unsigned long int);
else if (cflags == DP_C_LLONG)
value = (long)va_arg (args, unsigned LLONG);
else if (cflags == DP_C_SIZE)
value = va_arg (args, size_t);
#ifdef notyet
else if (cflags == DP_C_INTMAX)
value = va_arg (args, uintmax_t);
#endif
else
value = (long)va_arg (args, unsigned int);
if (fmtint(buffer, &currlen, maxlen, value,
8, min, max, flags) == -1)
return -1;
break;
case 'u':
flags |= DP_F_UNSIGNED;
if (cflags == DP_C_SHORT)
value = va_arg (args, unsigned int);
else if (cflags == DP_C_LONG)
value = (long)va_arg (args, unsigned long int);
else if (cflags == DP_C_LLONG)
value = (LLONG)va_arg (args, unsigned LLONG);
else if (cflags == DP_C_SIZE)
value = va_arg (args, size_t);
#ifdef notyet
else if (cflags == DP_C_INTMAX)
value = va_arg (args, uintmax_t);
#endif
else
value = (long)va_arg (args, unsigned int);
if (fmtint(buffer, &currlen, maxlen, value,
10, min, max, flags) == -1)
return -1;
break;
case 'X':
flags |= DP_F_UP;
case 'x':
flags |= DP_F_UNSIGNED;
if (cflags == DP_C_SHORT)
value = va_arg (args, unsigned int);
else if (cflags == DP_C_LONG)
value = (long)va_arg (args, unsigned long int);
else if (cflags == DP_C_LLONG)
value = (LLONG)va_arg (args, unsigned LLONG);
else if (cflags == DP_C_SIZE)
value = va_arg (args, size_t);
#ifdef notyet
else if (cflags == DP_C_INTMAX)
value = va_arg (args, uintmax_t);
#endif
else
value = (long)va_arg (args, unsigned int);
if (fmtint(buffer, &currlen, maxlen, value,
16, min, max, flags) == -1)
return -1;
break;
case 'f':
if (cflags == DP_C_LDOUBLE)
fvalue = va_arg (args, LDOUBLE);
else
fvalue = va_arg (args, double);
if (fmtfp(buffer, &currlen, maxlen, fvalue,
min, max, flags) == -1)
return -1;
break;
case 'E':
flags |= DP_F_UP;
case 'e':
if (cflags == DP_C_LDOUBLE)
fvalue = va_arg (args, LDOUBLE);
else
fvalue = va_arg (args, double);
if (fmtfp(buffer, &currlen, maxlen, fvalue,
min, max, flags) == -1)
return -1;
break;
case 'G':
flags |= DP_F_UP;
case 'g':
if (cflags == DP_C_LDOUBLE)
fvalue = va_arg (args, LDOUBLE);
else
fvalue = va_arg (args, double);
if (fmtfp(buffer, &currlen, maxlen, fvalue,
min, max, flags) == -1)
return -1;
break;
case 'c':
DOPR_OUTCH(buffer, currlen, maxlen,
va_arg (args, int));
break;
case 's':
strvalue = va_arg (args, char *);
if (!strvalue) strvalue = "(NULL)";
if (max == -1) {
max = strlen(strvalue);
}
if (min > 0 && max >= 0 && min > max) max = min;
if (fmtstr(buffer, &currlen, maxlen,
strvalue, flags, min, max) == -1)
return -1;
break;
case 'p':
strvalue = va_arg (args, void *);
if (fmtint(buffer, &currlen, maxlen,
(long) strvalue, 16, min, max, flags) == -1)
return -1;
break;
#if we_dont_want_this_in_openssh
case 'n':
if (cflags == DP_C_SHORT) {
short int *num;
num = va_arg (args, short int *);
*num = currlen;
} else if (cflags == DP_C_LONG) {
long int *num;
num = va_arg (args, long int *);
*num = (long int)currlen;
} else if (cflags == DP_C_LLONG) {
LLONG *num;
num = va_arg (args, LLONG *);
*num = (LLONG)currlen;
} else if (cflags == DP_C_SIZE) {
ssize_t *num;
num = va_arg (args, ssize_t *);
*num = (ssize_t)currlen;
} else if (cflags == DP_C_INTMAX) {
intmax_t *num;
num = va_arg (args, intmax_t *);
*num = (intmax_t)currlen;
} else {
int *num;
num = va_arg (args, int *);
*num = currlen;
}
break;
#endif
case '%':
DOPR_OUTCH(buffer, currlen, maxlen, ch);
break;
case 'w':
/* not supported yet, treat as next char */
ch = *format++;
break;
default:
/* Unknown, skip */
break;
}
ch = *format++;
state = DP_S_DEFAULT;
flags = cflags = min = 0;
max = -1;
break;
case DP_S_DONE:
break;
default:
/* hmm? */
break; /* some picky compilers need this */
}
}
if (maxlen != 0) {
if (currlen < maxlen - 1)
buffer[currlen] = '\0';
else if (maxlen > 0)
buffer[maxlen - 1] = '\0';
}
return currlen < INT_MAX ? (int)currlen : -1;
}
static int
fmtstr(char *buffer, size_t *currlen, size_t maxlen,
char *value, int flags, int min, int max)
{
int padlen, strln; /* amount to pad */
int cnt = 0;
#ifdef DEBUG_SNPRINTF
printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
#endif
if (value == 0) {
value = "<NULL>";
}
for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */
padlen = min - strln;
if (padlen < 0)
padlen = 0;
if (flags & DP_F_MINUS)
padlen = -padlen; /* Left Justify */
while ((padlen > 0) && (cnt < max)) {
DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
--padlen;
++cnt;
}
while (*value && (cnt < max)) {
DOPR_OUTCH(buffer, *currlen, maxlen, *value);
value++;
++cnt;
}
while ((padlen < 0) && (cnt < max)) {
DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
++padlen;
++cnt;
}
return 0;
}
/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
static int
fmtint(char *buffer, size_t *currlen, size_t maxlen,
intmax_t value, int base, int min, int max, int flags)
{
int signvalue = 0;
unsigned LLONG uvalue;
char convert[20];
int place = 0;
int spadlen = 0; /* amount to space pad */
int zpadlen = 0; /* amount to zero pad */
int caps = 0;
if (max < 0)
max = 0;
uvalue = value;
if(!(flags & DP_F_UNSIGNED)) {
if( value < 0 ) {
signvalue = '-';
uvalue = -value;
} else {
if (flags & DP_F_PLUS) /* Do a sign (+/i) */
signvalue = '+';
else if (flags & DP_F_SPACE)
signvalue = ' ';
}
}
if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
do {
convert[place++] =
(caps? "0123456789ABCDEF":"0123456789abcdef")
[uvalue % (unsigned)base ];
uvalue = (uvalue / (unsigned)base );
} while(uvalue && (place < 20));
if (place == 20) place--;
convert[place] = 0;
zpadlen = max - place;
spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
if (zpadlen < 0) zpadlen = 0;
if (spadlen < 0) spadlen = 0;
if (flags & DP_F_ZERO) {
zpadlen = MAX(zpadlen, spadlen);
spadlen = 0;
}
if (flags & DP_F_MINUS)
spadlen = -spadlen; /* Left Justifty */
#ifdef DEBUG_SNPRINTF
printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
zpadlen, spadlen, min, max, place);
#endif
/* Spaces */
while (spadlen > 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
--spadlen;
}
/* Sign */
if (signvalue)
DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
/* Zeros */
if (zpadlen > 0) {
while (zpadlen > 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, '0');
--zpadlen;
}
}
/* Digits */
while (place > 0) {
--place;
DOPR_OUTCH(buffer, *currlen, maxlen, convert[place]);
}
/* Left Justified spaces */
while (spadlen < 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
++spadlen;
}
return 0;
}
static LDOUBLE abs_val(LDOUBLE value)
{
LDOUBLE result = value;
if (value < 0)
result = -value;
return result;
}
static LDOUBLE POW10(int val)
{
LDOUBLE result = 1;
while (val) {
result *= 10;
val--;
}
return result;
}
static LLONG ROUND(LDOUBLE value)
{
LLONG intpart;
intpart = (LLONG)value;
value = value - intpart;
if (value >= 0.5) intpart++;
return intpart;
}
/* a replacement for modf that doesn't need the math library. Should
be portable, but slow */
static double my_modf(double x0, double *iptr)
{
int i;
long l;
double x = x0;
double f = 1.0;
for (i=0;i<100;i++) {
l = (long)x;
if (l <= (x+1) && l >= (x-1)) break;
x *= 0.1;
f *= 10.0;
}
if (i == 100) {
/*
* yikes! the number is beyond what we can handle.
* What do we do?
*/
(*iptr) = 0;
return 0;
}
if (i != 0) {
double i2;
double ret;
ret = my_modf(x0-l*f, &i2);
(*iptr) = l*f + i2;
return ret;
}
(*iptr) = l;
return x - (*iptr);
}
static int
fmtfp (char *buffer, size_t *currlen, size_t maxlen,
LDOUBLE fvalue, int min, int max, int flags)
{
int signvalue = 0;
double ufvalue;
char iconvert[311];
char fconvert[311];
int iplace = 0;
int fplace = 0;
int padlen = 0; /* amount to pad */
int zpadlen = 0;
int caps = 0;
int idx;
double intpart;
double fracpart;
double temp;
/*
* AIX manpage says the default is 0, but Solaris says the default
* is 6, and sprintf on AIX defaults to 6
*/
if (max < 0)
max = 6;
ufvalue = abs_val (fvalue);
if (fvalue < 0) {
signvalue = '-';
} else {
if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
signvalue = '+';
} else {
if (flags & DP_F_SPACE)
signvalue = ' ';
}
}
#if 0
if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
#endif
#if 0
if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
#endif
/*
* Sorry, we only support 16 digits past the decimal because of our
* conversion method
*/
if (max > 16)
max = 16;
/* We "cheat" by converting the fractional part to integer by
* multiplying by a factor of 10
*/
temp = ufvalue;
my_modf(temp, &intpart);
fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
if (fracpart >= POW10(max)) {
intpart++;
fracpart -= POW10(max);
}
/* Convert integer part */
do {
temp = intpart*0.1;
my_modf(temp, &intpart);
idx = (int) ((temp -intpart +0.05)* 10.0);
/* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
/* printf ("%llf, %f, %x\n", temp, intpart, idx); */
iconvert[iplace++] =
(caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
} while (intpart && (iplace < 311));
if (iplace == 311) iplace--;
iconvert[iplace] = 0;
/* Convert fractional part */
if (fracpart)
{
do {
temp = fracpart*0.1;
my_modf(temp, &fracpart);
idx = (int) ((temp -fracpart +0.05)* 10.0);
/* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */
/* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */
fconvert[fplace++] =
(caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
} while(fracpart && (fplace < 311));
if (fplace == 311) fplace--;
}
fconvert[fplace] = 0;
/* -1 for decimal point, another -1 if we are printing a sign */
padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
zpadlen = max - fplace;
if (zpadlen < 0) zpadlen = 0;
if (padlen < 0)
padlen = 0;
if (flags & DP_F_MINUS)
padlen = -padlen; /* Left Justifty */
if ((flags & DP_F_ZERO) && (padlen > 0)) {
if (signvalue) {
DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
--padlen;
signvalue = 0;
}
while (padlen > 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, '0');
--padlen;
}
}
while (padlen > 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
--padlen;
}
if (signvalue)
DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
while (iplace > 0) {
--iplace;
DOPR_OUTCH(buffer, *currlen, maxlen, iconvert[iplace]);
}
#ifdef DEBUG_SNPRINTF
printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
#endif
/*
* Decimal point. This should probably use locale to find the correct
* char to print out.
*/
if (max > 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, '.');
while (zpadlen > 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, '0');
--zpadlen;
}
while (fplace > 0) {
--fplace;
DOPR_OUTCH(buffer, *currlen, maxlen, fconvert[fplace]);
}
}
while (padlen < 0) {
DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
++padlen;
}
return 0;
}
#endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
#if !defined(HAVE_VSNPRINTF)
int
vsnprintf (char *str, size_t count, const char *fmt, va_list args)
{
return dopr(str, count, fmt, args);
}
#endif
#if !defined(HAVE_SNPRINTF)
int
snprintf(char *str, size_t count, SNPRINTF_CONST char *fmt, ...)
{
size_t ret;
va_list ap;
va_start(ap, fmt);
ret = vsnprintf(str, count, fmt, ap);
va_end(ap);
return ret;
}
#endif
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