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postgres/src/port/snprintf.c
Bruce Momjian 022ece2cf1 snprintf() %I64d code fix.
2005-03-02 15:07:09 +00:00

693 lines
17 KiB
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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#ifndef WIN32
#include <sys/ioctl.h>
#endif
#include <sys/param.h>
/*
** SNPRINTF, VSNPRINT -- counted versions of printf
**
** These versions have been grabbed off the net. They have been
** cleaned up to compile properly and support for .precision and
** %lx has been added.
*/
/**************************************************************
* 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)
*
* 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 nasty effects.
**************************************************************/
/*static char _id[] = "$PostgreSQL: pgsql/src/port/snprintf.c,v 1.14 2005/03/02 15:07:09 momjian Exp $";*/
int snprintf(char *str, size_t count, const char *fmt,...);
int vsnprintf(char *str, size_t count, const char *fmt, va_list args);
int printf(const char *format, ...);
static void dopr(char *buffer, const char *format, va_list args, char *end);
/*
* If vsnprintf() is not before snprintf() in this file, snprintf()
* will call the system vsnprintf() on MinGW.
*/
int
vsnprintf(char *str, size_t count, const char *fmt, va_list args)
{
char *end;
str[0] = '\0';
end = str + count - 1;
dopr(str, fmt, args, end);
if (count > 0)
end[0] = '\0';
return strlen(str);
}
int
snprintf(char *str, size_t count, const char *fmt,...)
{
int len;
va_list args;
va_start(args, fmt);
len = vsnprintf(str, count, fmt, args);
va_end(args);
return len;
}
int
printf(const char *fmt,...)
{
int len;
va_list args;
char* buffer[4096];
char* p;
va_start(args, fmt);
len = vsnprintf((char*)buffer, (size_t)4096, fmt, args);
va_end(args);
p = (char*)buffer;
for(;*p;p++)
putchar(*p);
return len;
}
/*
* dopr(): poor man's version of doprintf
*/
static void fmtstr(char *value, int ljust, int len, int zpad, int maxwidth,
char *end, char **output);
static void fmtnum(int64 value, int base, int dosign, int ljust, int len,
int zpad, char *end, char **output);
static void fmtfloat(double value, char type, int ljust, int len,
int precision, int pointflag, char *end, char **output);
static void dostr(char *str, int cut, char *end, char **output);
static void dopr_outch(int c, char *end, char **output);
#define FMTSTR 1
#define FMTNUM 2
#define FMTFLOAT 3
#define FMTCHAR 4
static void
dopr(char *buffer, const char *format, va_list args, char *end)
{
int ch;
int64 value;
double fvalue;
int longlongflag = 0;
int longflag = 0;
int pointflag = 0;
int maxwidth = 0;
char *strvalue;
int ljust;
int len;
int zpad;
int i;
const char* format_save;
const char* fmtbegin;
int fmtpos = 1;
int realpos = 0;
int position;
char *output;
int percents = 1;
const char *p;
struct fmtpar {
const char* fmtbegin;
const char* fmtend;
void* value;
int64 numvalue;
double fvalue;
int charvalue;
int ljust;
int len;
int zpad;
int maxwidth;
int base;
int dosign;
char type;
int precision;
int pointflag;
char func;
int realpos;
} *fmtpar, **fmtparptr;
/* Create enough structures to hold all arguments */
for (p = format; *p != '\0'; p++)
if (*p == '%') /* counts %% as two, so overcounts */
percents++;
#ifndef FRONTEND
fmtpar = pgport_palloc(sizeof(struct fmtpar) * percents);
fmtparptr = pgport_palloc(sizeof(struct fmtpar *) * percents);
#else
if ((fmtpar = malloc(sizeof(struct fmtpar) * percents)) == NULL)
{
fprintf(stderr, _("out of memory\n"));
exit(1);
}
if ((fmtparptr = malloc(sizeof(struct fmtpar *) * percents)) == NULL)
{
fprintf(stderr, _("out of memory\n"));
exit(1);
}
#endif
format_save = format;
output = buffer;
while ((ch = *format++))
{
switch (ch)
{
case '%':
ljust = len = zpad = maxwidth = 0;
longflag = longlongflag = pointflag = 0;
fmtbegin = format - 1;
realpos = 0;
position = 0;
nextch:
ch = *format++;
switch (ch)
{
case 0:
goto performpr;
case '-':
ljust = 1;
goto nextch;
case '0': /* set zero padding if len not set */
if (len == 0 && !pointflag)
zpad = '0';
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (pointflag)
maxwidth = maxwidth * 10 + ch - '0';
else
{
len = len * 10 + ch - '0';
position = position * 10 + ch - '0';
}
goto nextch;
case '$':
realpos = position;
len = 0;
goto nextch;
case '*':
if (pointflag)
maxwidth = va_arg(args, int);
else
len = va_arg(args, int);
goto nextch;
case '.':
pointflag = 1;
goto nextch;
case 'l':
if (longflag)
longlongflag = 1;
else
longflag = 1;
goto nextch;
/*
* We might export this to client apps so we should
* support 'qd' and 'I64d'(MinGW) also in case the
* native version does.
*/
case 'q':
longlongflag = 1;
longflag = 1;
goto nextch;
case 'I':
if (*(format+1) == '6' && *(format+2) == '4')
{
format += 2;
longlongflag = 1;
longflag = 1;
goto nextch;
}
break;
case 'u':
case 'U':
/* fmtnum(value,base,dosign,ljust,len,zpad,&output) */
if (longflag)
{
if (longlongflag)
value = va_arg(args, uint64);
else
value = va_arg(args, unsigned long);
}
else
value = va_arg(args, unsigned int);
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].numvalue = value;
fmtpar[fmtpos].base = 10;
fmtpar[fmtpos].dosign = 0;
fmtpar[fmtpos].ljust = ljust;
fmtpar[fmtpos].len = len;
fmtpar[fmtpos].zpad = zpad;
fmtpar[fmtpos].func = FMTNUM;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
break;
case 'o':
case 'O':
/* fmtnum(value,base,dosign,ljust,len,zpad,&output) */
if (longflag)
{
if (longlongflag)
value = va_arg(args, uint64);
else
value = va_arg(args, unsigned long);
}
else
value = va_arg(args, unsigned int);
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].numvalue = value;
fmtpar[fmtpos].base = 8;
fmtpar[fmtpos].dosign = 0;
fmtpar[fmtpos].ljust = ljust;
fmtpar[fmtpos].len = len;
fmtpar[fmtpos].zpad = zpad;
fmtpar[fmtpos].func = FMTNUM;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
break;
case 'd':
case 'D':
if (longflag)
{
if (longlongflag)
{
value = va_arg(args, int64);
}
else
value = va_arg(args, long);
}
else
value = va_arg(args, int);
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].numvalue = value;
fmtpar[fmtpos].base = 10;
fmtpar[fmtpos].dosign = 1;
fmtpar[fmtpos].ljust = ljust;
fmtpar[fmtpos].len = len;
fmtpar[fmtpos].zpad = zpad;
fmtpar[fmtpos].func = FMTNUM;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
break;
case 'x':
if (longflag)
{
if (longlongflag)
value = va_arg(args, uint64);
else
value = va_arg(args, unsigned long);
}
else
value = va_arg(args, unsigned int);
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].numvalue = value;
fmtpar[fmtpos].base = 16;
fmtpar[fmtpos].dosign = 0;
fmtpar[fmtpos].ljust = ljust;
fmtpar[fmtpos].len = len;
fmtpar[fmtpos].zpad = zpad;
fmtpar[fmtpos].func = FMTNUM;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
break;
case 'X':
if (longflag)
{
if (longlongflag)
value = va_arg(args, uint64);
else
value = va_arg(args, unsigned long);
}
else
value = va_arg(args, unsigned int);
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].numvalue = value;
fmtpar[fmtpos].base = -16;
fmtpar[fmtpos].dosign = 1;
fmtpar[fmtpos].ljust = ljust;
fmtpar[fmtpos].len = len;
fmtpar[fmtpos].zpad = zpad;
fmtpar[fmtpos].func = FMTNUM;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
break;
case 's':
strvalue = va_arg(args, char *);
if (maxwidth > 0 || !pointflag)
{
if (pointflag && len > maxwidth)
len = maxwidth; /* Adjust padding */
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].value = strvalue;
fmtpar[fmtpos].ljust = ljust;
fmtpar[fmtpos].len = len;
fmtpar[fmtpos].zpad = zpad;
fmtpar[fmtpos].maxwidth = maxwidth;
fmtpar[fmtpos].func = FMTSTR;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
}
break;
case 'c':
ch = va_arg(args, int);
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].charvalue = ch;
fmtpar[fmtpos].func = FMTCHAR;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
fvalue = va_arg(args, double);
fmtpar[fmtpos].fmtbegin = fmtbegin;
fmtpar[fmtpos].fmtend = format;
fmtpar[fmtpos].fvalue = fvalue;
fmtpar[fmtpos].type = ch;
fmtpar[fmtpos].ljust = ljust;
fmtpar[fmtpos].len = len;
fmtpar[fmtpos].maxwidth = maxwidth;
fmtpar[fmtpos].pointflag = pointflag;
fmtpar[fmtpos].func = FMTFLOAT;
fmtpar[fmtpos].realpos = realpos?realpos:fmtpos;
fmtpos++;
break;
case '%':
break;
default:
dostr("???????", 0, end, &output);
}
break;
default:
dopr_outch(ch, end, &output);
break;
}
}
performpr:
/* shuffle pointers */
for(i = 1; i < fmtpos; i++)
fmtparptr[i] = &fmtpar[fmtpar[i].realpos];
output = buffer;
format = format_save;
while ((ch = *format++))
{
for(i = 1; i < fmtpos; i++)
{
if(ch == '%' && *format == '%')
{
format++;
continue;
}
if(fmtpar[i].fmtbegin == format - 1)
{
switch(fmtparptr[i]->func){
case FMTSTR:
fmtstr(fmtparptr[i]->value, fmtparptr[i]->ljust,
fmtparptr[i]->len, fmtparptr[i]->zpad,
fmtparptr[i]->maxwidth, end, &output);
break;
case FMTNUM:
fmtnum(fmtparptr[i]->numvalue, fmtparptr[i]->base,
fmtparptr[i]->dosign, fmtparptr[i]->ljust,
fmtparptr[i]->len, fmtparptr[i]->zpad, end, &output);
break;
case FMTFLOAT:
fmtfloat(fmtparptr[i]->fvalue, fmtparptr[i]->type,
fmtparptr[i]->ljust, fmtparptr[i]->len,
fmtparptr[i]->precision, fmtparptr[i]->pointflag,
end, &output);
break;
case FMTCHAR:
dopr_outch(fmtparptr[i]->charvalue, end, &output);
break;
}
format = fmtpar[i].fmtend;
goto nochar;
}
}
dopr_outch(ch, end, &output);
nochar:
/* nothing */
; /* semicolon required because a goto has to be attached to a statement */
}
*output = '\0';
#ifndef FRONTEND
pgport_pfree(fmtpar);
pgport_pfree(fmtparptr);
#else
free(fmtpar);
free(fmtparptr);
#endif
}
static void
fmtstr(char *value, int ljust, int len, int zpad, int maxwidth, char *end,
char **output)
{
int padlen,
strlen; /* amount to pad */
if (value == 0)
value = "<NULL>";
for (strlen = 0; value[strlen]; ++strlen); /* strlen */
if (strlen > maxwidth && maxwidth)
strlen = maxwidth;
padlen = len - strlen;
if (padlen < 0)
padlen = 0;
if (ljust)
padlen = -padlen;
while (padlen > 0)
{
dopr_outch(' ', end, output);
--padlen;
}
dostr(value, maxwidth, end, output);
while (padlen < 0)
{
dopr_outch(' ', end, output);
++padlen;
}
}
static void
fmtnum(int64 value, int base, int dosign, int ljust, int len, int zpad,
char *end, char **output)
{
int signvalue = 0;
uint64 uvalue;
char convert[64];
int place = 0;
int padlen = 0; /* amount to pad */
int caps = 0;
/*
* DEBUGP(("value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad
* %d\n", value, base, dosign, ljust, len, zpad ));
*/
uvalue = value;
if (dosign)
{
if (value < 0)
{
signvalue = '-';
uvalue = -value;
}
}
if (base < 0)
{
caps = 1;
base = -base;
}
do
{
convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")
[uvalue % (unsigned) base];
uvalue = (uvalue / (unsigned) base);
} while (uvalue);
convert[place] = 0;
if (len < 0)
{
/* this could happen with a "*" width spec */
ljust = 1;
len = -len;
}
padlen = len - place;
if (padlen < 0)
padlen = 0;
if (ljust)
padlen = -padlen;
/*
* DEBUGP(( "str '%s', place %d, sign %c, padlen %d\n",
* convert,place,signvalue,padlen));
*/
if (zpad && padlen > 0)
{
if (signvalue)
{
dopr_outch(signvalue, end, output);
--padlen;
signvalue = 0;
}
while (padlen > 0)
{
dopr_outch(zpad, end, output);
--padlen;
}
}
while (padlen > 0)
{
dopr_outch(' ', end, output);
--padlen;
}
if (signvalue)
dopr_outch(signvalue, end, output);
while (place > 0)
dopr_outch(convert[--place], end, output);
while (padlen < 0)
{
dopr_outch(' ', end, output);
++padlen;
}
}
static void
fmtfloat(double value, char type, int ljust, int len, int precision,
int pointflag, char *end, char **output)
{
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);
sprintf(convert, fmt, value);
if (len < 0)
{
/* this could happen with a "*" width spec */
ljust = 1;
len = -len;
}
padlen = len - strlen(convert);
if (padlen < 0)
padlen = 0;
if (ljust)
padlen = -padlen;
while (padlen > 0)
{
dopr_outch(' ', end, output);
--padlen;
}
dostr(convert, 0, end, output);
while (padlen < 0)
{
dopr_outch(' ', end, output);
++padlen;
}
}
static void
dostr(char *str, int cut, char *end, char **output)
{
if (cut)
{
while (*str && cut-- > 0)
dopr_outch(*str++, end, output);
}
else
{
while (*str)
dopr_outch(*str++, end, output);
}
}
static void
dopr_outch(int c, char *end, char **output)
{
#ifdef NOT_USED
if (iscntrl((unsigned char) c) && c != '\n' && c != '\t')
{
c = '@' + (c & 0x1F);
if (end == 0 || *output < end)
*(*output)++ = '^';
}
#endif
if (end == 0 || *output < end)
*(*output)++ = c;
}
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