Thread-safe snprintf() vsnprintf() and printf()
Nicolai Tufar <[email protected]>
| Newsgroups | gmane.comp.db.postgresql.devel.win32,gmane.comp.db.postgresql.devel.general,gmane.comp.db.postgresql.devel.patches |
|---|---|
| Message-ID | <[email protected]> |
And while we are on it, I would like to submit minor changes to make snprintf() vsnprintf() and printf() functions in src/port/snprintf.c thread-safe. Best regards, Nicolai Tufar ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [email protected]
snprintf.diff
(text/x-patch, 9.1 KB)
Index: src/port/snprintf.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/port/snprintf.c,v
retrieving revision 1.7
diff -c -r1.7 snprintf.c
*** src/port/snprintf.c 28 Feb 2005 14:16:16 -0000 1.7
--- src/port/snprintf.c 28 Feb 2005 23:11:22 -0000
***************
*** 82,105 ****
* for string length. This covers a nasty loophole.
*
* The other functions are there to prevent NULL pointers from
! * causing nast effects.
**************************************************************/
! /*static char _id[] = "$PostgreSQL: pgsql/src/port/snprintf.c,v 1.7 2005/02/28 14:16:16 momjian Exp $";*/
! static char *end;
! static int SnprfOverflow;
int snprintf(char *str, size_t count, const char *fmt,...);
int vsnprintf(char *str, size_t count, const char *fmt, va_list args);
int printf(const char *format, ...);
! static void dopr(char *buffer, const char *format, va_list args);
int
printf(const char *fmt,...)
{
int len;
va_list args;
! static char* buffer[4096];
char* p;
va_start(args, fmt);
--- 82,103 ----
* for string length. This covers a nasty loophole.
*
* The other functions are there to prevent NULL pointers from
! * causing nasty effects.
**************************************************************/
! /*static char _id[] = "$PostgreSQL: pgsql/src/port/snprintf.c,v 1.6 2005/02/22 04:57:24 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);
int
printf(const char *fmt,...)
{
int len;
va_list args;
! char* buffer[4096];
char* p;
va_start(args, fmt);
***************
*** 127,136 ****
int
vsnprintf(char *str, size_t count, const char *fmt, va_list args)
{
str[0] = '\0';
end = str + count - 1;
! SnprfOverflow = 0;
! dopr(str, fmt, args);
if (count > 0)
end[0] = '\0';
return strlen(str);
--- 125,134 ----
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);
***************
*** 140,150 ****
* dopr(): poor man's version of doprintf
*/
! static void fmtstr(char *value, int ljust, int len, int zpad, int maxwidth);
! static void fmtnum(long_long value, int base, int dosign, int ljust, int len, int zpad);
! static void fmtfloat(double value, char type, int ljust, int len, int precision, int pointflag);
! static void dostr(char *str, int cut);
! static void dopr_outch(int c);
static char *output;
--- 138,148 ----
* dopr(): poor man's version of doprintf
*/
! static void fmtstr(char *value, int ljust, int len, int zpad, int maxwidth, char *end);
! static void fmtnum(long_long value, int base, int dosign, int ljust, int len, int zpad, char *end);
! static void fmtfloat(double value, char type, int ljust, int len, int precision, int pointflag, char *end);
! static void dostr(char *str, int cut, char *end);
! static void dopr_outch(int c, char *end);
static char *output;
***************
*** 154,160 ****
#define FMTCHAR 4
static void
! dopr(char *buffer, const char *format, va_list args)
{
int ch;
long_long value;
--- 152,158 ----
#define FMTCHAR 4
static void
! dopr(char *buffer, const char *format, va_list args, char *end)
{
int ch;
long_long value;
***************
*** 417,427 ****
case '%':
break;
default:
! dostr("???????", 0);
}
break;
default:
! dopr_outch(ch);
break;
}
}
--- 415,425 ----
case '%':
break;
default:
! dostr("???????", 0, end);
}
break;
default:
! dopr_outch(ch, end);
break;
}
}
***************
*** 448,474 ****
case FMTSTR:
fmtstr(fmtparptr[i]->value, fmtparptr[i]->ljust,
fmtparptr[i]->len, fmtparptr[i]->zpad,
! fmtparptr[i]->maxwidth);
break;
case FMTNUM:
fmtnum(fmtparptr[i]->numvalue, fmtparptr[i]->base,
fmtparptr[i]->dosign, fmtparptr[i]->ljust,
! fmtparptr[i]->len, fmtparptr[i]->zpad);
break;
case FMTFLOAT:
fmtfloat(fmtparptr[i]->fvalue, fmtparptr[i]->type,
fmtparptr[i]->ljust, fmtparptr[i]->len,
! fmtparptr[i]->precision, fmtparptr[i]->pointflag);
break;
case FMTCHAR:
! dopr_outch(fmtparptr[i]->charvalue);
break;
}
format = fmtpar[i].fmtend;
goto nochar;
}
}
! dopr_outch(ch);
nochar:
/* nothing */
; /* semicolon required because a goto has to be attached to a statement */
--- 446,473 ----
case FMTSTR:
fmtstr(fmtparptr[i]->value, fmtparptr[i]->ljust,
fmtparptr[i]->len, fmtparptr[i]->zpad,
! fmtparptr[i]->maxwidth, end);
break;
case FMTNUM:
fmtnum(fmtparptr[i]->numvalue, fmtparptr[i]->base,
fmtparptr[i]->dosign, fmtparptr[i]->ljust,
! fmtparptr[i]->len, fmtparptr[i]->zpad, end);
break;
case FMTFLOAT:
fmtfloat(fmtparptr[i]->fvalue, fmtparptr[i]->type,
fmtparptr[i]->ljust, fmtparptr[i]->len,
! fmtparptr[i]->precision, fmtparptr[i]->pointflag,
! end);
break;
case FMTCHAR:
! dopr_outch(fmtparptr[i]->charvalue, end);
break;
}
format = fmtpar[i].fmtend;
goto nochar;
}
}
! dopr_outch(ch, end);
nochar:
/* nothing */
; /* semicolon required because a goto has to be attached to a statement */
***************
*** 477,483 ****
}
static void
! fmtstr(char *value, int ljust, int len, int zpad, int maxwidth)
{
int padlen,
strlen; /* amount to pad */
--- 476,482 ----
}
static void
! fmtstr(char *value, int ljust, int len, int zpad, int maxwidth, char *end)
{
int padlen,
strlen; /* amount to pad */
***************
*** 494,512 ****
padlen = -padlen;
while (padlen > 0)
{
! dopr_outch(' ');
--padlen;
}
! dostr(value, maxwidth);
while (padlen < 0)
{
! dopr_outch(' ');
++padlen;
}
}
static void
! fmtnum(long_long value, int base, int dosign, int ljust, int len, int zpad)
{
int signvalue = 0;
ulong_long uvalue;
--- 493,511 ----
padlen = -padlen;
while (padlen > 0)
{
! dopr_outch(' ', end);
--padlen;
}
! dostr(value, maxwidth, end);
while (padlen < 0)
{
! dopr_outch(' ', end);
++padlen;
}
}
static void
! fmtnum(long_long value, int base, int dosign, int ljust, int len, int zpad, char *end)
{
int signvalue = 0;
ulong_long uvalue;
***************
*** 561,594 ****
{
if (signvalue)
{
! dopr_outch(signvalue);
--padlen;
signvalue = 0;
}
while (padlen > 0)
{
! dopr_outch(zpad);
--padlen;
}
}
while (padlen > 0)
{
! dopr_outch(' ');
--padlen;
}
if (signvalue)
! dopr_outch(signvalue);
while (place > 0)
! dopr_outch(convert[--place]);
while (padlen < 0)
{
! dopr_outch(' ');
++padlen;
}
}
static void
! fmtfloat(double value, char type, int ljust, int len, int precision, int pointflag)
{
char fmt[32];
char convert[512];
--- 560,593 ----
{
if (signvalue)
{
! dopr_outch(signvalue, end);
--padlen;
signvalue = 0;
}
while (padlen > 0)
{
! dopr_outch(zpad, end);
--padlen;
}
}
while (padlen > 0)
{
! dopr_outch(' ', end);
--padlen;
}
if (signvalue)
! dopr_outch(signvalue, end);
while (place > 0)
! dopr_outch(convert[--place], end);
while (padlen < 0)
{
! dopr_outch(' ', end);
++padlen;
}
}
static void
! fmtfloat(double value, char type, int ljust, int len, int precision, int pointflag, char *end)
{
char fmt[32];
char convert[512];
***************
*** 615,648 ****
while (padlen > 0)
{
! dopr_outch(' ');
--padlen;
}
! dostr(convert, 0);
while (padlen < 0)
{
! dopr_outch(' ');
++padlen;
}
}
static void
! dostr(char *str, int cut)
{
if (cut)
{
while (*str && cut-- > 0)
! dopr_outch(*str++);
}
else
{
while (*str)
! dopr_outch(*str++);
}
}
static void
! dopr_outch(int c)
{
#ifdef NOT_USED
if (iscntrl((unsigned char) c) && c != '\n' && c != '\t')
--- 614,647 ----
while (padlen > 0)
{
! dopr_outch(' ', end);
--padlen;
}
! dostr(convert, 0, end);
while (padlen < 0)
{
! dopr_outch(' ', end);
++padlen;
}
}
static void
! dostr(char *str, int cut, char *end)
{
if (cut)
{
while (*str && cut-- > 0)
! dopr_outch(*str++, end);
}
else
{
while (*str)
! dopr_outch(*str++, end);
}
}
static void
! dopr_outch(int c, char *end)
{
#ifdef NOT_USED
if (iscntrl((unsigned char) c) && c != '\n' && c != '\t')
***************
*** 654,659 ****
#endif
if (end == 0 || output < end)
*output++ = c;
- else
- SnprfOverflow++;
}
--- 653,656 ----