Date: Tue, 10 Sep 1996 14:35:55 -0700 (PDT) From: Mark Diekhans <markd@Grizzly.COM> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/1597: No support for positional parameters in *printf functions Message-ID: <199609102135.OAA09937@osprey.grizzly.com> Resent-Message-ID: <199609102140.OAA16605@freefall.freebsd.org>
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>Number: 1597
>Category: bin
>Synopsis: No support for positional parameters in *printf functions
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Sep 10 14:40:02 PDT 1996
>Last-Modified:
>Originator: Mark Diekhans
>Organization:
== Mark Diekhans <markd@grizzly.com> ==
>Release: FreeBSD 2.2-960801-SNAP i386
>Environment:
>Description:
FreeBSD lacks support for XPG/3 style positional arguments in the *printf
family of functions (e.g. %2$s). This functionality is available on most
modern Unix systems and in GNU libc. Its fairly essential in developing
XPG/3 style localized software (FreeBSD has XPG/3 catopen, etc).
>How-To-Repeat:
>Fix:
The following patch to lib/libc/stdio implements positional arguments in
a manner consistent with other implementations. Its done in a way that
adds only a tiny amount of overhead when positional arguments are not used.
I also have a test program to go with this, but don't know where it belongs
in the tree.
*** printf.3.ORG Sun Sep 8 13:56:14 1996
--- printf.3 Sun Sep 8 15:15:18 1996
***************
*** 176,181 ****
--- 176,191 ----
the following appear in sequence:
.Bl -bullet
.It
+ An optional field, consisting of a decimal digit string followed by a
+ .Cm $ ,
+ specifying the next argument to access .
+ If this field is not provided, the argument following the last
+ argument accessed will be used.
+ Arguments are numbered starting at
+ .Cm 1 .
+ If unaccessed arguments in the format string are interspersed with ones that
+ are accessed the results will be indeterminate.
+ .It
Zero or more of the following flags:
.Bl -hyphen
.It
***************
*** 394,399 ****
--- 404,411 ----
A field width or precision, or both, may be indicated by
an asterisk
.Ql *
+ or an asterisk followed by one or more decimal digits and a
+ .Ql $
instead of a
digit string.
In this case, an
***************
*** 402,407 ****
--- 414,421 ----
A negative field width is treated as a left adjustment flag followed by a
positive field width; a negative precision is treated as though it were
missing.
+ If a single format directive mixes positional (nn$)
+ and non-positional arguments, the results are undefined.
.Pp
The conversion specifiers and their meanings are:
.Bl -tag -width "diouxX"
*** vfprintf.c.ORG Sat Sep 7 19:47:59 1996
--- vfprintf.c Sun Sep 8 16:16:35 1996
***************
*** 75,80 ****
--- 75,82 ----
static int __sbprintf __P((FILE *, const char *, va_list));
static char * __ultoa __P((u_long, char *, int, int, char *));
static char * __uqtoa __P((u_quad_t, char *, int, int, char *));
+ static void __find_arguments __P((const char *, va_list, void ***));
+ static void __grow_type_table __P((int, unsigned char **, int *));
/*
* Flush out all the vectors defined by the given uio,
***************
*** 274,279 ****
--- 276,282 ----
#endif /* FLOATING_POINT */
+ #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */
/*
* Flags used during conversion.
***************
*** 295,301 ****
{
register char *fmt; /* format string */
register int ch; /* character from fmt */
! register int n; /* handy integer (short term usage) */
register char *cp; /* handy char pointer (short term usage) */
register struct __siov *iovp;/* for PRINT macro */
register int flags; /* flags as above */
--- 298,304 ----
{
register char *fmt; /* format string */
register int ch; /* character from fmt */
! register int n, n2; /* handy integer (short term usage) */
register char *cp; /* handy char pointer (short term usage) */
register struct __siov *iovp;/* for PRINT macro */
register int flags; /* flags as above */
***************
*** 323,328 ****
--- 326,335 ----
struct __siov iov[NIOV];/* ... and individual io vectors */
char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
char ox[2]; /* space for 0x hex-prefix */
+ void **argtable; /* args, built due to positional arg */
+ void *statargtable [STATIC_ARG_TBL_SIZE];
+ int nextarg; /* 1-based argument index */
+ va_list orgap; /* original argument pointer */
/*
* Choose PADSIZE to trade efficiency vs. size. If larger printf
***************
*** 365,382 ****
iovp = iov; \
}
/*
* To extend shorts properly, we need both signed and unsigned
* argument extraction methods.
*/
#define SARG() \
! (flags&LONGINT ? va_arg(ap, long) : \
! flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
! (long)va_arg(ap, int))
#define UARG() \
! (flags&LONGINT ? va_arg(ap, u_long) : \
! flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
! (u_long)va_arg(ap, u_int))
#ifdef _THREAD_SAFE
_thread_flockfile(fp,__FILE__,__LINE__);
--- 372,424 ----
iovp = iov; \
}
+ /*
+ * Get the argument indexed by nextarg. If the argument table is
+ * built, use it to get the argument. If its not, get the next
+ * argument (and arguments must be gotten sequentially).
+ */
+ #define GETARG(type) \
+ ((argtable != NULL) ? *((type*)(argtable[nextarg++])) : \
+ (nextarg++, va_arg(ap, type)))
+
/*
* To extend shorts properly, we need both signed and unsigned
* argument extraction methods.
*/
#define SARG() \
! (flags&LONGINT ? GETARG(long) : \
! flags&SHORTINT ? (long)(short)GETARG(int) : \
! (long)GETARG(int))
#define UARG() \
! (flags&LONGINT ? GETARG(u_long) : \
! flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \
! (u_long)GETARG(u_int))
!
! /*
! * Get * arguments, including the form *nn$. Preserve the nextarg
! * that the argument can be gotten once the type is determined.
! */
! #define GETASTER(val) \
! n2 = 0; \
! cp = fmt; \
! while (is_digit(*cp)) { \
! n2 = 10 * n2 + to_digit(*cp); \
! cp++; \
! } \
! if (*cp == '$') { \
! int hold = nextarg; \
! if (argtable == NULL) { \
! argtable = statargtable; \
! __find_arguments (fmt0, orgap, &argtable); \
! } \
! nextarg = n2; \
! val = GETARG (int); \
! nextarg = hold; \
! fmt = ++cp; \
! } else { \
! val = GETARG (int); \
! }
!
#ifdef _THREAD_SAFE
_thread_flockfile(fp,__FILE__,__LINE__);
***************
*** 399,404 ****
--- 441,449 ----
}
fmt = (char *)fmt0;
+ argtable = NULL;
+ nextarg = 1;
+ orgap = ap;
uio.uio_iov = iovp = iov;
uio.uio_resid = 0;
uio.uio_iovcnt = 0;
***************
*** 445,451 ****
* -- ANSI X3J11
* They don't exclude field widths read from args.
*/
! if ((width = va_arg(ap, int)) >= 0)
goto rflag;
width = -width;
/* FALLTHROUGH */
--- 490,497 ----
* -- ANSI X3J11
* They don't exclude field widths read from args.
*/
! GETASTER (width);
! if (width >= 0)
goto rflag;
width = -width;
/* FALLTHROUGH */
***************
*** 457,463 ****
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
! n = va_arg(ap, int);
prec = n < 0 ? -1 : n;
goto rflag;
}
--- 503,509 ----
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
! GETASTER (n);
prec = n < 0 ? -1 : n;
goto rflag;
}
***************
*** 483,488 ****
--- 529,543 ----
n = 10 * n + to_digit(ch);
ch = *fmt++;
} while (is_digit(ch));
+ if (ch == '$') {
+ nextarg = n;
+ if (argtable == NULL) {
+ argtable = statargtable;
+ __find_arguments (fmt0, orgap,
+ &argtable);
+ }
+ goto rflag;
+ }
width = n;
goto reswitch;
#ifdef FLOATING_POINT
***************
*** 500,506 ****
flags |= QUADINT;
goto rflag;
case 'c':
! *(cp = buf) = va_arg(ap, int);
size = 1;
sign = '\0';
break;
--- 555,561 ----
flags |= QUADINT;
goto rflag;
case 'c':
! *(cp = buf) = GETARG(int);
size = 1;
sign = '\0';
break;
***************
*** 510,516 ****
case 'd':
case 'i':
if (flags & QUADINT) {
! uqval = va_arg(ap, quad_t);
if ((quad_t)uqval < 0) {
uqval = -uqval;
sign = '-';
--- 565,571 ----
case 'd':
case 'i':
if (flags & QUADINT) {
! uqval = GETARG(quad_t);
if ((quad_t)uqval < 0) {
uqval = -uqval;
sign = '-';
***************
*** 536,544 ****
fp_begin: if (prec == -1)
prec = DEFPREC;
if (flags & LONGDBL)
! _double = (double)va_arg(ap, long double);
else
! _double = va_arg(ap, double);
/* do this before tricky precision changes */
if (isinf(_double)) {
if (_double < 0)
--- 591,599 ----
fp_begin: if (prec == -1)
prec = DEFPREC;
if (flags & LONGDBL)
! _double = (double)GETARG(long double);
else
! _double = GETARG(double);
/* do this before tricky precision changes */
if (isinf(_double)) {
if (_double < 0)
***************
*** 588,607 ****
#endif /* FLOATING_POINT */
case 'n':
if (flags & QUADINT)
! *va_arg(ap, quad_t *) = ret;
else if (flags & LONGINT)
! *va_arg(ap, long *) = ret;
else if (flags & SHORTINT)
! *va_arg(ap, short *) = ret;
else
! *va_arg(ap, int *) = ret;
continue; /* no output */
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
if (flags & QUADINT)
! uqval = va_arg(ap, u_quad_t);
else
ulval = UARG();
base = 8;
--- 643,662 ----
#endif /* FLOATING_POINT */
case 'n':
if (flags & QUADINT)
! *GETARG(quad_t *) = ret;
else if (flags & LONGINT)
! *GETARG(long *) = ret;
else if (flags & SHORTINT)
! *GETARG(short *) = ret;
else
! *GETARG(int *) = ret;
continue; /* no output */
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
if (flags & QUADINT)
! uqval = GETARG(u_quad_t);
else
ulval = UARG();
base = 8;
***************
*** 614,627 ****
* defined manner.''
* -- ANSI X3J11
*/
! ulval = (u_long)va_arg(ap, void *);
base = 16;
xdigs = "0123456789abcdef";
flags = (flags & ~QUADINT) | HEXPREFIX;
ch = 'x';
goto nosign;
case 's':
! if ((cp = va_arg(ap, char *)) == NULL)
cp = "(null)";
if (prec >= 0) {
/*
--- 669,682 ----
* defined manner.''
* -- ANSI X3J11
*/
! ulval = (u_long)GETARG(void *);
base = 16;
xdigs = "0123456789abcdef";
flags = (flags & ~QUADINT) | HEXPREFIX;
ch = 'x';
goto nosign;
case 's':
! if ((cp = GETARG(char *)) == NULL)
cp = "(null)";
if (prec >= 0) {
/*
***************
*** 646,652 ****
/*FALLTHROUGH*/
case 'u':
if (flags & QUADINT)
! uqval = va_arg(ap, u_quad_t);
else
ulval = UARG();
base = 10;
--- 701,707 ----
/*FALLTHROUGH*/
case 'u':
if (flags & QUADINT)
! uqval = GETARG(u_quad_t);
else
ulval = UARG();
base = 10;
***************
*** 657,663 ****
case 'x':
xdigs = "0123456789abcdef";
hex: if (flags & QUADINT)
! uqval = va_arg(ap, u_quad_t);
else
ulval = UARG();
base = 16;
--- 712,718 ----
case 'x':
xdigs = "0123456789abcdef";
hex: if (flags & QUADINT)
! uqval = GETARG(u_quad_t);
else
ulval = UARG();
base = 16;
***************
*** 809,817 ****
--- 864,1195 ----
#ifdef _THREAD_SAFE
_thread_funlockfile(fp);
#endif
+ if ((argtable != NULL) && (argtable != statargtable))
+ free (argtable);
return (ret);
/* NOTREACHED */
}
+
+ /*
+ * Type ids for argument type table.
+ */
+ #define T_UNUSED 0
+ #define T_SHORT 1
+ #define T_U_SHORT 2
+ #define TP_SHORT 3
+ #define T_INT 4
+ #define T_U_INT 5
+ #define TP_INT 6
+ #define T_LONG 7
+ #define T_U_LONG 8
+ #define TP_LONG 9
+ #define T_QUAD 10
+ #define T_U_QUAD 11
+ #define TP_QUAD 12
+ #define T_DOUBLE 13
+ #define T_LONG_DOUBLE 14
+ #define TP_CHAR 15
+ #define TP_VOID 16
+
+ /*
+ * Find all arguments when a positional parameter is encountered. Returns a
+ * table, indexed by argument number, of pointers to each arguments. The
+ * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
+ * It will be replaces with a malloc-ed on if it overflows.
+ */
+ static void
+ __find_arguments (fmt0, ap, argtable)
+ const char *fmt0;
+ va_list ap;
+ void ***argtable;
+ {
+ register char *fmt; /* format string */
+ register int ch; /* character from fmt */
+ register int n, n2; /* handy integer (short term usage) */
+ register char *cp; /* handy char pointer (short term usage) */
+ register int flags; /* flags as above */
+ int width; /* width from format (%8d), or 0 */
+ unsigned char *typetable; /* table of types */
+ unsigned char stattypetable [STATIC_ARG_TBL_SIZE];
+ int tablesize; /* current size of type table */
+ int tablemax; /* largest used index in table */
+ int nextarg; /* 1-based argument index */
+
+ /*
+ * Add an argument type to the table, expanding if necessary.
+ */
+ #define ADDTYPE(type) \
+ ((nextarg >= tablesize) ? \
+ __grow_type_table(nextarg, &typetable, &tablesize) : 0, \
+ typetable[nextarg++] = type, \
+ (nextarg > tablemax) ? tablemax = nextarg : 0)
+
+ #define ADDSARG() \
+ ((flags&LONGINT) ? ADDTYPE(T_LONG) : \
+ ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : ADDTYPE(T_INT)))
+
+ #define ADDUARG() \
+ ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \
+ ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : ADDTYPE(T_U_INT)))
+
+ /*
+ * Add * arguments to the type array.
+ */
+ #define ADDASTER() \
+ n2 = 0; \
+ cp = fmt; \
+ while (is_digit(*cp)) { \
+ n2 = 10 * n2 + to_digit(*cp); \
+ cp++; \
+ } \
+ if (*cp == '$') { \
+ int hold = nextarg; \
+ nextarg = n2; \
+ ADDTYPE (T_INT); \
+ nextarg = hold; \
+ fmt = ++cp; \
+ } else { \
+ ADDTYPE (T_INT); \
+ }
+ fmt = (char *)fmt0;
+ typetable = stattypetable;
+ tablesize = STATIC_ARG_TBL_SIZE;
+ tablemax = 0;
+ nextarg = 1;
+ memset (typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
+
+ /*
+ * Scan the format for conversions (`%' character).
+ */
+ for (;;) {
+ for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
+ /* void */;
+ if (ch == '\0')
+ goto done;
+ fmt++; /* skip over '%' */
+
+ flags = 0;
+ width = 0;
+
+ rflag: ch = *fmt++;
+ reswitch: switch (ch) {
+ case ' ':
+ case '#':
+ goto rflag;
+ case '*':
+ ADDASTER ();
+ goto rflag;
+ case '-':
+ case '+':
+ goto rflag;
+ case '.':
+ if ((ch = *fmt++) == '*') {
+ ADDASTER ();
+ goto rflag;
+ }
+ while (is_digit(ch)) {
+ ch = *fmt++;
+ }
+ goto reswitch;
+ case '0':
+ goto rflag;
+ case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ n = 0;
+ do {
+ n = 10 * n + to_digit(ch);
+ ch = *fmt++;
+ } while (is_digit(ch));
+ if (ch == '$') {
+ nextarg = n;
+ goto rflag;
+ }
+ width = n;
+ goto reswitch;
+ #ifdef FLOATING_POINT
+ case 'L':
+ flags |= LONGDBL;
+ goto rflag;
+ #endif
+ case 'h':
+ flags |= SHORTINT;
+ goto rflag;
+ case 'l':
+ flags |= LONGINT;
+ goto rflag;
+ case 'q':
+ flags |= QUADINT;
+ goto rflag;
+ case 'c':
+ ADDTYPE(T_INT);
+ break;
+ case 'D':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 'd':
+ case 'i':
+ if (flags & QUADINT) {
+ ADDTYPE(T_QUAD);
+ } else {
+ ADDSARG();
+ }
+ break;
+ #ifdef FLOATING_POINT
+ case 'e':
+ case 'E':
+ case 'f':
+ case 'g':
+ case 'G':
+ if (flags & LONGDBL)
+ ADDTYPE(T_LONG_DOUBLE);
+ else
+ ADDTYPE(T_DOUBLE);
+ break;
+ #endif /* FLOATING_POINT */
+ case 'n':
+ if (flags & QUADINT)
+ ADDTYPE(TP_QUAD);
+ else if (flags & LONGINT)
+ ADDTYPE(TP_LONG);
+ else if (flags & SHORTINT)
+ ADDTYPE(TP_SHORT);
+ else
+ ADDTYPE(TP_INT);
+ continue; /* no output */
+ case 'O':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 'o':
+ if (flags & QUADINT)
+ ADDTYPE(T_U_QUAD);
+ else
+ ADDUARG();
+ break;
+ case 'p':
+ ADDTYPE(TP_VOID);
+ break;
+ case 's':
+ ADDTYPE(TP_CHAR);
+ break;
+ case 'U':
+ flags |= LONGINT;
+ /*FALLTHROUGH*/
+ case 'u':
+ if (flags & QUADINT)
+ ADDTYPE(T_U_QUAD);
+ else
+ ADDUARG();
+ break;
+ case 'X':
+ case 'x':
+ if (flags & QUADINT)
+ ADDTYPE(T_U_QUAD);
+ else
+ ADDUARG();
+ break;
+ default: /* "%?" prints ?, unless ? is NUL */
+ if (ch == '\0')
+ goto done;
+ break;
+ }
+ }
+ done:
+ /*
+ * Build the argument table.
+ */
+ if (tablemax >= STATIC_ARG_TBL_SIZE) {
+ *argtable = (void **)
+ malloc (sizeof (void *) * (tablemax + 1));
+ }
+
+ (*argtable) [0] = NULL;
+ for (n = 1; n <= tablemax; n++) {
+ (*argtable) [n] = ap;
+ switch (typetable [n]) {
+ case T_UNUSED:
+ (void) va_arg (ap, int);
+ break;
+ case T_SHORT:
+ (void) va_arg (ap, int);
+ break;
+ case T_U_SHORT:
+ (void) va_arg (ap, int);
+ break;
+ case TP_SHORT:
+ (void) va_arg (ap, short *);
+ break;
+ case T_INT:
+ (void) va_arg (ap, int);
+ break;
+ case T_U_INT:
+ (void) va_arg (ap, unsigned int);
+ break;
+ case TP_INT:
+ (void) va_arg (ap, int *);
+ break;
+ case T_LONG:
+ (void) va_arg (ap, long);
+ break;
+ case T_U_LONG:
+ (void) va_arg (ap, unsigned long);
+ break;
+ case TP_LONG:
+ (void) va_arg (ap, long *);
+ break;
+ case T_QUAD:
+ (void) va_arg (ap, quad_t);
+ break;
+ case T_U_QUAD:
+ (void) va_arg (ap, u_quad_t);
+ break;
+ case TP_QUAD:
+ (void) va_arg (ap, quad_t *);
+ break;
+ case T_DOUBLE:
+ (void) va_arg (ap, double);
+ break;
+ case T_LONG_DOUBLE:
+ (void) va_arg (ap, long double);
+ break;
+ case TP_CHAR:
+ (void) va_arg (ap, char *);
+ break;
+ case TP_VOID:
+ (void) va_arg (ap, void *);
+ break;
+ }
+ }
+
+ if ((typetable != NULL) && (typetable != stattypetable))
+ free (typetable);
+ }
+
+ /*
+ * Increase the size of the type table.
+ */
+ static void
+ __grow_type_table (nextarg, typetable, tablesize)
+ int nextarg;
+ unsigned char **typetable;
+ int *tablesize;
+ {
+ unsigned char *oldtable = *typetable;
+ int newsize = *tablesize * 2;
+
+ if (*tablesize == STATIC_ARG_TBL_SIZE) {
+ *typetable = (unsigned char *)
+ malloc (sizeof (unsigned char) * newsize);
+ bcopy (oldtable, *typetable, *tablesize);
+ } else {
+ *typetable = (unsigned char *)
+ realloc (typetable, sizeof (unsigned char) * newsize);
+
+ }
+ memset (&typetable [*tablesize], T_UNUSED, (newsize - *tablesize));
+
+ *tablesize = newsize;
+ }
+
#ifdef FLOATING_POINT
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