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niotso/deps/libpq/snprintf.c

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/*
* Copyright (c) 1983, 1995, 1996 Eric P. Allman
* Copyright (c) 1988, 1993
* The Regents of the University of California. 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. Neither the name of the University 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 THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS 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.
*
* src/port/snprintf.c
*/
#include "c.h"
#include <limits.h>
#ifndef WIN32
#include <sys/ioctl.h>
#endif
#include <sys/param.h>
#ifndef NL_ARGMAX
#define NL_ARGMAX 16
#endif
/*
* SNPRINTF, VSNPRINTF and friends
*
* These versions have been grabbed off the net. They have been
* cleaned up to compile properly and support for most of the Single Unix
* Specification has been added. Remaining unimplemented features are:
*
* 1. No locale support: the radix character is always '.' and the '
* (single quote) format flag is ignored.
*
* 2. No support for the "%n" format specification.
*
* 3. No support for wide characters ("lc" and "ls" formats).
*
* 4. No support for "long double" ("Lf" and related formats).
*
* 5. Space and '#' flags are not implemented.
*
*
* The result values of these functions are not the same across different
* platforms. This implementation is compatible with the Single Unix Spec:
*
* 1. -1 is returned only if processing is abandoned due to an invalid
* parameter, such as incorrect format string. (Although not required by
* the spec, this happens only when no characters have yet been transmitted
* to the destination.)
*
* 2. For snprintf and sprintf, 0 is returned if str == NULL or count == 0;
* no data has been stored.
*
* 3. Otherwise, the number of bytes actually transmitted to the destination
* is returned (excluding the trailing '\0' for snprintf and sprintf).
*
* For snprintf with nonzero count, the result cannot be more than count-1
* (a trailing '\0' is always stored); it is not possible to distinguish
* buffer overrun from exact fit. This is unlike some implementations that
* return the number of bytes that would have been needed for the complete
* result string.
*/
/**************************************************************
* 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. (now it does ... tgl)
**************************************************************/
/* Prevent recursion */
#undef vsnprintf
#undef snprintf
#undef sprintf
#undef vfprintf
#undef fprintf
#undef printf
/* Info about where the formatted output is going */
typedef struct
{
char *bufptr; /* next buffer output position */
char *bufstart; /* first buffer element */
char *bufend; /* last buffer element, or NULL */
/* bufend == NULL is for sprintf, where we assume buf is big enough */
FILE *stream; /* eventual output destination, or NULL */
int nchars; /* # chars already sent to stream */
} PrintfTarget;
/*
* Info about the type and value of a formatting parameter. Note that we
* don't currently support "long double", "wint_t", or "wchar_t *" data,
* nor the '%n' formatting code; else we'd need more types. Also, at this
* level we need not worry about signed vs unsigned values.
*/
typedef enum
{
ATYPE_NONE = 0,
ATYPE_INT,
ATYPE_LONG,
ATYPE_LONGLONG,
ATYPE_DOUBLE,
ATYPE_CHARPTR
} PrintfArgType;
typedef union
{
int i;
long l;
int64 ll;
double d;
char *cptr;
} PrintfArgValue;
static void flushbuffer(PrintfTarget *target);
static int dopr(PrintfTarget *target, const char *format, va_list args);
int
pg_vsnprintf(char *str, size_t count, const char *fmt, va_list args)
{
PrintfTarget target;
if (str == NULL || count == 0)
return 0;
target.bufstart = target.bufptr = str;
target.bufend = str + count - 1;
target.stream = NULL;
/* target.nchars is unused in this case */
if (dopr(&target, fmt, args))
{
*(target.bufptr) = '\0';
errno = EINVAL; /* bad format */
return -1;
}
*(target.bufptr) = '\0';
return target.bufptr - target.bufstart;
}
int
pg_snprintf(char *str, size_t count, const char *fmt,...)
{
int len;
va_list args;
va_start(args, fmt);
len = pg_vsnprintf(str, count, fmt, args);
va_end(args);
return len;
}
static int
pg_vsprintf(char *str, const char *fmt, va_list args)
{
PrintfTarget target;
if (str == NULL)
return 0;
target.bufstart = target.bufptr = str;
target.bufend = NULL;
target.stream = NULL;
/* target.nchars is unused in this case */
if (dopr(&target, fmt, args))
{
*(target.bufptr) = '\0';
errno = EINVAL; /* bad format */
return -1;
}
*(target.bufptr) = '\0';
return target.bufptr - target.bufstart;
}
int
pg_sprintf(char *str, const char *fmt,...)
{
int len;
va_list args;
va_start(args, fmt);
len = pg_vsprintf(str, fmt, args);
va_end(args);
return len;
}
int
pg_vfprintf(FILE *stream, const char *fmt, va_list args)
{
PrintfTarget target;
char buffer[1024]; /* size is arbitrary */
if (stream == NULL)
{
errno = EINVAL;
return -1;
}
target.bufstart = target.bufptr = buffer;
target.bufend = buffer + sizeof(buffer) - 1;
target.stream = stream;
target.nchars = 0;
if (dopr(&target, fmt, args))
{
errno = EINVAL; /* bad format */
return -1;
}
/* dump any remaining buffer contents */
flushbuffer(&target);
return target.nchars;
}
int
pg_fprintf(FILE *stream, const char *fmt,...)
{
int len;
va_list args;
va_start(args, fmt);
len = pg_vfprintf(stream, fmt, args);
va_end(args);
return len;
}
int
pg_printf(const char *fmt,...)
{
int len;
va_list args;
va_start(args, fmt);
len = pg_vfprintf(stdout, fmt, args);
va_end(args);
return len;
}
/* call this only when stream is defined */
static void
flushbuffer(PrintfTarget *target)
{
size_t nc = target->bufptr - target->bufstart;
if (nc > 0)
target->nchars += fwrite(target->bufstart, 1, nc, target->stream);
target->bufptr = target->bufstart;
}
static void fmtstr(char *value, int leftjust, int minlen, int maxwidth,
int pointflag, PrintfTarget *target);
static void fmtptr(void *value, PrintfTarget *target);
static void fmtint(int64 value, char type, int forcesign,
int leftjust, int minlen, int zpad, int precision, int pointflag,
PrintfTarget *target);
static void fmtchar(int value, int leftjust, int minlen, PrintfTarget *target);
static void fmtfloat(double value, char type, int forcesign,
int leftjust, int minlen, int zpad, int precision, int pointflag,
PrintfTarget *target);
static void dostr(const char *str, int slen, PrintfTarget *target);
static void dopr_outch(int c, PrintfTarget *target);
static int adjust_sign(int is_negative, int forcesign, int *signvalue);
static void adjust_padlen(int minlen, int vallen, int leftjust, int *padlen);
static void leading_pad(int zpad, int *signvalue, int *padlen,
PrintfTarget *target);
static void trailing_pad(int *padlen, PrintfTarget *target);
/*
* dopr(): poor man's version of doprintf
*/
static int
dopr(PrintfTarget *target, const char *format, va_list args)
{
const char *format_start = format;
int ch;
bool have_dollar;
bool have_non_dollar;
bool have_star;
bool afterstar;
int accum;
int longlongflag;
int longflag;
int pointflag;
int leftjust;
int fieldwidth;
int precision;
int zpad;
int forcesign;
int last_dollar;
int fmtpos;
int cvalue;
int64 numvalue;
double fvalue;
char *strvalue;
int i;
PrintfArgType argtypes[NL_ARGMAX + 1];
PrintfArgValue argvalues[NL_ARGMAX + 1];
/*
* Parse the format string to determine whether there are %n$ format
* specs, and identify the types and order of the format parameters.
*/
have_dollar = have_non_dollar = false;
last_dollar = 0;
MemSet(argtypes, 0, sizeof(argtypes));
while ((ch = *format++) != '\0')
{
if (ch != '%')
continue;
longflag = longlongflag = pointflag = 0;
fmtpos = accum = 0;
afterstar = false;
nextch1:
ch = *format++;
if (ch == '\0')
break; /* illegal, but we don't complain */
switch (ch)
{
case '-':
case '+':
goto nextch1;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
accum = accum * 10 + (ch - '0');
goto nextch1;
case '.':
pointflag = 1;
accum = 0;
goto nextch1;
case '*':
if (afterstar)
have_non_dollar = true; /* multiple stars */
afterstar = true;
accum = 0;
goto nextch1;
case '$':
have_dollar = true;
if (accum <= 0 || accum > NL_ARGMAX)
return -1;
if (afterstar)
{
if (argtypes[accum] &&
argtypes[accum] != ATYPE_INT)
return -1;
argtypes[accum] = ATYPE_INT;
last_dollar = Max(last_dollar, accum);
afterstar = false;
}
else
fmtpos = accum;
accum = 0;
goto nextch1;
case 'l':
if (longflag)
longlongflag = 1;
else
longflag = 1;
goto nextch1;
case 'h':
case '\'':
/* ignore these */
goto nextch1;
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
if (fmtpos)
{
PrintfArgType atype;
if (longlongflag)
atype = ATYPE_LONGLONG;
else if (longflag)
atype = ATYPE_LONG;
else
atype = ATYPE_INT;
if (argtypes[fmtpos] &&
argtypes[fmtpos] != atype)
return -1;
argtypes[fmtpos] = atype;
last_dollar = Max(last_dollar, fmtpos);
}
else
have_non_dollar = true;
break;
case 'c':
if (fmtpos)
{
if (argtypes[fmtpos] &&
argtypes[fmtpos] != ATYPE_INT)
return -1;
argtypes[fmtpos] = ATYPE_INT;
last_dollar = Max(last_dollar, fmtpos);
}
else
have_non_dollar = true;
break;
case 's':
case 'p':
if (fmtpos)
{
if (argtypes[fmtpos] &&
argtypes[fmtpos] != ATYPE_CHARPTR)
return -1;
argtypes[fmtpos] = ATYPE_CHARPTR;
last_dollar = Max(last_dollar, fmtpos);
}
else
have_non_dollar = true;
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
if (fmtpos)
{
if (argtypes[fmtpos] &&
argtypes[fmtpos] != ATYPE_DOUBLE)
return -1;
argtypes[fmtpos] = ATYPE_DOUBLE;
last_dollar = Max(last_dollar, fmtpos);
}
else
have_non_dollar = true;
break;
case '%':
break;
}
/*
* If we finish the spec with afterstar still set, there's a
* non-dollar star in there.
*/
if (afterstar)
have_non_dollar = true;
}
/* Per spec, you use either all dollar or all not. */
if (have_dollar && have_non_dollar)
return -1;
/*
* In dollar mode, collect the arguments in physical order.
*/
for (i = 1; i <= last_dollar; i++)
{
switch (argtypes[i])
{
case ATYPE_NONE:
return -1; /* invalid format */
case ATYPE_INT:
argvalues[i].i = va_arg(args, int);
break;
case ATYPE_LONG:
argvalues[i].l = va_arg(args, long);
break;
case ATYPE_LONGLONG:
argvalues[i].ll = va_arg(args, int64);
break;
case ATYPE_DOUBLE:
argvalues[i].d = va_arg(args, double);
break;
case ATYPE_CHARPTR:
argvalues[i].cptr = va_arg(args, char *);
break;
}
}
/*
* At last we can parse the format for real.
*/
format = format_start;
while ((ch = *format++) != '\0')
{
if (ch != '%')
{
dopr_outch(ch, target);
continue;
}
fieldwidth = precision = zpad = leftjust = forcesign = 0;
longflag = longlongflag = pointflag = 0;
fmtpos = accum = 0;
have_star = afterstar = false;
nextch2:
ch = *format++;
if (ch == '\0')
break; /* illegal, but we don't complain */
switch (ch)
{
case '-':
leftjust = 1;
goto nextch2;
case '+':
forcesign = 1;
goto nextch2;
case '0':
/* set zero padding if no nonzero digits yet */
if (accum == 0 && !pointflag)
zpad = '0';
/* FALL THRU */
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
accum = accum * 10 + (ch - '0');
goto nextch2;
case '.':
if (have_star)
have_star = false;
else
fieldwidth = accum;
pointflag = 1;
accum = 0;
goto nextch2;
case '*':
if (have_dollar)
{
/* process value after reading n$ */
afterstar = true;
}
else
{
/* fetch and process value now */
int starval = va_arg(args, int);
if (pointflag)
{
precision = starval;
if (precision < 0)
{
precision = 0;
pointflag = 0;
}
}
else
{
fieldwidth = starval;
if (fieldwidth < 0)
{
leftjust = 1;
fieldwidth = -fieldwidth;
}
}
}
have_star = true;
accum = 0;
goto nextch2;
case '$':
if (afterstar)
{
/* fetch and process star value */
int starval = argvalues[accum].i;
if (pointflag)
{
precision = starval;
if (precision < 0)
{
precision = 0;
pointflag = 0;
}
}
else
{
fieldwidth = starval;
if (fieldwidth < 0)
{
leftjust = 1;
fieldwidth = -fieldwidth;
}
}
afterstar = false;
}
else
fmtpos = accum;
accum = 0;
goto nextch2;
case 'l':
if (longflag)
longlongflag = 1;
else
longflag = 1;
goto nextch2;
case 'h':
case '\'':
/* ignore these */
goto nextch2;
case 'd':
case 'i':
if (!have_star)
{
if (pointflag)
precision = accum;
else
fieldwidth = accum;
}
if (have_dollar)
{
if (longlongflag)
numvalue = argvalues[fmtpos].ll;
else if (longflag)
numvalue = argvalues[fmtpos].l;
else
numvalue = argvalues[fmtpos].i;
}
else
{
if (longlongflag)
numvalue = va_arg(args, int64);
else if (longflag)
numvalue = va_arg(args, long);
else
numvalue = va_arg(args, int);
}
fmtint(numvalue, ch, forcesign, leftjust, fieldwidth, zpad,
precision, pointflag, target);
break;
case 'o':
case 'u':
case 'x':
case 'X':
if (!have_star)
{
if (pointflag)
precision = accum;
else
fieldwidth = accum;
}
if (have_dollar)
{
if (longlongflag)
numvalue = (uint64) argvalues[fmtpos].ll;
else if (longflag)
numvalue = (unsigned long) argvalues[fmtpos].l;
else
numvalue = (unsigned int) argvalues[fmtpos].i;
}
else
{
if (longlongflag)
numvalue = (uint64) va_arg(args, int64);
else if (longflag)
numvalue = (unsigned long) va_arg(args, long);
else
numvalue = (unsigned int) va_arg(args, int);
}
fmtint(numvalue, ch, forcesign, leftjust, fieldwidth, zpad,
precision, pointflag, target);
break;
case 'c':
if (!have_star)
{
if (pointflag)
precision = accum;
else
fieldwidth = accum;
}
if (have_dollar)
cvalue = (unsigned char) argvalues[fmtpos].i;
else
cvalue = (unsigned char) va_arg(args, int);
fmtchar(cvalue, leftjust, fieldwidth, target);
break;
case 's':
if (!have_star)
{
if (pointflag)
precision = accum;
else
fieldwidth = accum;
}
if (have_dollar)
strvalue = argvalues[fmtpos].cptr;
else
strvalue = va_arg(args, char *);
fmtstr(strvalue, leftjust, fieldwidth, precision, pointflag,
target);
break;
case 'p':
/* fieldwidth/leftjust are ignored ... */
if (have_dollar)
strvalue = argvalues[fmtpos].cptr;
else
strvalue = va_arg(args, char *);
fmtptr((void *) strvalue, target);
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
if (!have_star)
{
if (pointflag)
precision = accum;
else
fieldwidth = accum;
}
if (have_dollar)
fvalue = argvalues[fmtpos].d;
else
fvalue = va_arg(args, double);
fmtfloat(fvalue, ch, forcesign, leftjust,
fieldwidth, zpad,
precision, pointflag,
target);
break;
case '%':
dopr_outch('%', target);
break;
}
}
return 0;
}
static size_t
pg_strnlen(const char *str, size_t maxlen)
{
const char *p = str;
while (maxlen-- > 0 && *p)
p++;
return p - str;
}
static void
fmtstr(char *value, int leftjust, int minlen, int maxwidth,
int pointflag, PrintfTarget *target)
{
int padlen,
vallen; /* amount to pad */
/*
* If a maxwidth (precision) is specified, we must not fetch more bytes
* than that.
*/
if (pointflag)
vallen = pg_strnlen(value, maxwidth);
else
vallen = strlen(value);
adjust_padlen(minlen, vallen, leftjust, &padlen);
while (padlen > 0)
{
dopr_outch(' ', target);
--padlen;
}
dostr(value, vallen, target);
trailing_pad(&padlen, target);
}
static void
fmtptr(void *value, PrintfTarget *target)
{
int vallen;
char convert[64];
/* we rely on regular C library's sprintf to do the basic conversion */
vallen = sprintf(convert, "%p", value);
dostr(convert, vallen, target);
}
static void
fmtint(int64 value, char type, int forcesign, int leftjust,
int minlen, int zpad, int precision, int pointflag,
PrintfTarget *target)
{
uint64 base;
int dosign;
const char *cvt = "0123456789abcdef";
int signvalue = 0;
char convert[64];
int vallen = 0;
int padlen = 0; /* amount to pad */
int zeropad; /* extra leading zeroes */
switch (type)
{
case 'd':
case 'i':
base = 10;
dosign = 1;
break;
case 'o':
base = 8;
dosign = 0;
break;
case 'u':
base = 10;
dosign = 0;
break;
case 'x':
base = 16;
dosign = 0;
break;
case 'X':
cvt = "0123456789ABCDEF";
base = 16;
dosign = 0;
break;
default:
return; /* keep compiler quiet */
}
/* Handle +/- */
if (dosign && adjust_sign((value < 0), forcesign, &signvalue))
value = -value;
/*
* SUS: the result of converting 0 with an explicit precision of 0 is no
* characters
*/
if (value == 0 && pointflag && precision == 0)
vallen = 0;
else
{
/* make integer string */
uint64 uvalue = (uint64) value;
do
{
convert[vallen++] = cvt[uvalue % base];
uvalue = uvalue / base;
} while (uvalue);
}
zeropad = Max(0, precision - vallen);
adjust_padlen(minlen, vallen + zeropad, leftjust, &padlen);
leading_pad(zpad, &signvalue, &padlen, target);
while (zeropad-- > 0)
dopr_outch('0', target);
while (vallen > 0)
dopr_outch(convert[--vallen], target);
trailing_pad(&padlen, target);
}
static void
fmtchar(int value, int leftjust, int minlen, PrintfTarget *target)
{
int padlen = 0; /* amount to pad */
adjust_padlen(minlen, 1, leftjust, &padlen);
while (padlen > 0)
{
dopr_outch(' ', target);
--padlen;
}
dopr_outch(value, target);
trailing_pad(&padlen, target);
}
static void
fmtfloat(double value, char type, int forcesign, int leftjust,
int minlen, int zpad, int precision, int pointflag,
PrintfTarget *target)
{
int signvalue = 0;
int vallen;
char fmt[32];
char convert[512];
int padlen = 0; /* amount to pad */
/* we rely on regular C library's sprintf to do the basic conversion */
if (pointflag)
sprintf(fmt, "%%.%d%c", precision, type);
else
sprintf(fmt, "%%%c", type);
if (adjust_sign((value < 0), forcesign, &signvalue))
value = -value;
vallen = sprintf(convert, fmt, value);
adjust_padlen(minlen, vallen, leftjust, &padlen);
leading_pad(zpad, &signvalue, &padlen, target);
dostr(convert, vallen, target);
trailing_pad(&padlen, target);
}
static void
dostr(const char *str, int slen, PrintfTarget *target)
{
while (slen > 0)
{
int avail;
if (target->bufend != NULL)
avail = target->bufend - target->bufptr;
else
avail = slen;
if (avail <= 0)
{
/* buffer full, can we dump to stream? */
if (target->stream == NULL)
return; /* no, lose the data */
flushbuffer(target);
continue;
}
avail = Min(avail, slen);
memmove(target->bufptr, str, avail);
target->bufptr += avail;
str += avail;
slen -= avail;
}
}
static void
dopr_outch(int c, PrintfTarget *target)
{
if (target->bufend != NULL && target->bufptr >= target->bufend)
{
/* buffer full, can we dump to stream? */
if (target->stream == NULL)
return; /* no, lose the data */
flushbuffer(target);
}
*(target->bufptr++) = c;
}
static int
adjust_sign(int is_negative, int forcesign, int *signvalue)
{
if (is_negative)
{
*signvalue = '-';
return true;
}
else if (forcesign)
*signvalue = '+';
return false;
}
static void
adjust_padlen(int minlen, int vallen, int leftjust, int *padlen)
{
*padlen = minlen - vallen;
if (*padlen < 0)
*padlen = 0;
if (leftjust)
*padlen = -(*padlen);
}
static void
leading_pad(int zpad, int *signvalue, int *padlen, PrintfTarget *target)
{
if (*padlen > 0 && zpad)
{
if (*signvalue)
{
dopr_outch(*signvalue, target);
--(*padlen);
*signvalue = 0;
}
while (*padlen > 0)
{
dopr_outch(zpad, target);
--(*padlen);
}
}
while (*padlen > (*signvalue != 0))
{
dopr_outch(' ', target);
--(*padlen);
}
if (*signvalue)
{
dopr_outch(*signvalue, target);
if (*padlen > 0)
--(*padlen);
else if (*padlen < 0)
++(*padlen);
}
}
static void
trailing_pad(int *padlen, PrintfTarget *target)
{
while (*padlen < 0)
{
dopr_outch(' ', target);
++(*padlen);
}
}
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