Deal with cvs "feature"... or is that cvs _user_...

2 files changed, 5204 insertions, 0 deletions

diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c
new file mode 100644
index 000000000..ad4da445b
--- /dev/null
+++ b/libc/stdio/printf.c
@@ -0,0 +1,2033 @@
+/*  Copyright (C) 2002     Manuel Novoa III
+ *  My stdio library for linux and (soon) elks.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* This code needs a lot of clean up.  Some of that is on hold until uClibc
+ * gets a better configuration system (on Erik's todo list).
+ * The other cleanup will take place during the implementation/integration of
+ * the wide char (un)formatted i/o functions which I'm currently working on.
+ */
+
+/*  ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!
+ *
+ *  This code is currently under development.  Also, I plan to port
+ *  it to elks which is a 16-bit environment with a fairly limited
+ *  compiler.  Therefore, please refrain from modifying this code
+ *  and, instead, pass any bug-fixes, etc. to me.  Thanks.  Manuel
+ *
+ *  ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION! */
+
+#define _ISOC99_SOURCE			/* for ULLONG primarily... */
+#define _GNU_SOURCE
+#define _STDIO_UTILITY			/* We're using _uintmaxtostr. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stddef.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <stdint.h>
+#include <errno.h>
+
+#define __PRINTF_INFO_NO_BITFIELD
+#include <printf.h>
+
+#ifdef __STDIO_THREADSAFE
+#include <pthread.h>
+#endif /* __STDIO_THREADSAFE */
+
+/**********************************************************************/
+
+#define __STDIO_GLIBC_CUSTOM_PRINTF
+
+/* TODO -- move these to a configuration section? */
+#define MAX_FIELD_WIDTH		4095
+#define MAX_USER_SPEC 10
+#define MAX_POS_ARGS 10
+
+/* TODO - fix the defs below */
+#define MAX_ARGS_PER_SPEC   (MAX_POS_ARGS-2)
+
+#if MAX_ARGS_PER_SPEC + 2 > MAX_POS_ARGS
+#define MAX_ARGS		MAX_ARGS_PER_SPEC + 2
+#else
+#define MAX_ARGS		MAX_POS_ARGS
+#endif
+
+/**********************************************************************/
+
+#define __PA_FLAG_INTMASK \
+	(__PA_FLAG_CHAR|PA_FLAG_SHORT|__PA_FLAG_INT|PA_FLAG_LONG|PA_FLAG_LONG_LONG)
+
+extern printf_function *_custom_printf_handler[MAX_USER_SPEC];
+extern printf_arginfo_function *_custom_printf_arginfo[MAX_USER_SPEC];
+extern char *_custom_printf_spec;
+
+/**********************************************************************/
+
+#define SPEC_FLAGS		" +0-#'I"
+enum {
+	FLAG_SPACE		=	0x01,
+	FLAG_PLUS		=	0x02,	/* must be 2 * FLAG_SPACE */
+	FLAG_ZERO		=	0x04,
+	FLAG_MINUS		=	0x08,	/* must be 2 * FLAG_ZERO */
+	FLAG_HASH		=	0x10,
+	FLAG_THOUSANDS	=	0x20,
+	FLAG_I18N		=	0x40	/* only works for d, i, u */
+};	  
+
+/**********************************************************************/
+
+/* float layout          01234567890123456789   TODO: B?*/
+#define SPEC_CHARS		"npxXoudifFeEgGaACScs"
+enum {
+	CONV_n = 0,
+	CONV_p,
+	CONV_x, CONV_X,	CONV_o,	CONV_u,	CONV_d,	CONV_i,
+	CONV_f, CONV_F, CONV_e, CONV_E, CONV_g, CONV_G, CONV_a, CONV_A,
+	CONV_C, CONV_S, CONV_c, CONV_s,
+	CONV_m,
+	CONV_custom0				/* must be last */
+};
+
+/*                         p   x   X  o   u   d   i */
+#define SPEC_BASE		{ 16, 16, 16, 8, 10, 10, 10 }
+
+#define SPEC_RANGES		{ CONV_n, CONV_p, CONV_i, CONV_A, \
+						  CONV_C, CONV_S, CONV_c, CONV_s, CONV_custom0 }
+
+#define SPEC_OR_MASK		 { \
+	/* n */			(PA_FLAG_PTR|PA_INT), \
+	/* p */			PA_POINTER, \
+	/* oxXudi */	PA_INT, \
+	/* fFeEgGaA */	PA_DOUBLE, \
+	/* C */			PA_WCHAR, \
+	/* S */			PA_WSTRING, \
+	/* c */			PA_CHAR, \
+	/* s */			PA_STRING, \
+}
+
+#define SPEC_AND_MASK		{ \
+	/* n */			(PA_FLAG_PTR|__PA_INTMASK), \
+	/* p */			PA_POINTER, \
+	/* oxXudi */	(__PA_INTMASK), \
+	/* fFeEgGaA */	(PA_FLAG_LONG_DOUBLE|PA_DOUBLE), \
+	/* C */			(PA_WCHAR), \
+	/* S */			(PA_WSTRING), \
+	/* c */			(PA_CHAR), \
+	/* s */			(PA_STRING), \
+}
+
+/**********************************************************************/
+/*
+ * In order to ease translation to what arginfo and _print_info._flags expect,
+ * we map:  0:int  1:char  2:longlong 4:long  8:short
+ * and then _flags |= (((q << 7) + q) & 0x701) and argtype |= (_flags & 0x701)
+ */
+
+/* TODO -- Fix the table below to take into account stdint.h. */
+#if PTRDIFF_MAX != INT_MAX
+#error fix QUAL_CHARS ptrdiff_t entry 't'!
+#endif
+#if SIZE_MAX != UINT_MAX
+#error fix QUAL_CHARS size_t entries 'z', 'Z'!
+#endif
+#ifndef LLONG_MAX
+#error fix QUAL_CHARS for no long long!  Affects 'L', 'j', 'q', 'll'.
+#else
+#if LLONG_MAX != INTMAX_MAX
+#error fix QUAL_CHARS intmax_t entry 'j'!
+#endif
+#endif
+
+#define QUAL_CHARS		{ \
+	/* j:(u)intmax_t z:(s)size_t  t:ptrdiff_t  \0:int */ \
+	/* q:long_long  Z:(s)size_t */ \
+	'h',   'l',  'L',  'j',  'z',  't',  'q', 'Z',  0, \
+	 2,     4,    8,    8,    0,    0,    8,   0,   0, /* TODO -- fix!!! */\
+     1,     8 \
+}
+
+/**********************************************************************/
+
+#ifdef __STDIO_VA_ARG_PTR
+#ifdef __BCC__
+#define __va_arg_ptr(ap,type)		(((type *)(ap += sizeof(type))) - 1)
+#endif
+
+#if 1
+#ifdef __GNUC__
+/* TODO -- need other than for 386 as well! */
+
+#ifndef __va_rounded_size
+#define __va_rounded_size(TYPE)  \
+  (((sizeof (TYPE) + sizeof (int) - 1) / sizeof (int)) * sizeof (int))
+#endif
+#define __va_arg_ptr(AP, TYPE)						\
+ (AP = (va_list) ((char *) (AP) + __va_rounded_size (TYPE)),	\
+  ((void *) ((char *) (AP) - __va_rounded_size (TYPE))))
+#endif
+#endif
+#endif /* __STDIO_VA_ARG_PTR */
+
+#ifdef __va_arg_ptr
+#define GET_VA_ARG(AP,F,TYPE,ARGS)	(*(AP) = __va_arg_ptr(ARGS,TYPE))
+#define GET_ARG_VALUE(AP,F,TYPE)	(*((TYPE *)(*(AP))))
+#else
+typedef union {
+	wchar_t wc;
+	unsigned int u;
+	unsigned long ul;
+#ifdef ULLONG_MAX
+	unsigned long long ull;
+#endif
+#ifndef __BCC__
+	double d;
+	long double ld;
+#endif
+	void *p;
+} argvalue_t;
+
+#define GET_VA_ARG(AU,F,TYPE,ARGS)	(AU->F = va_arg(ARGS,TYPE))
+#define GET_ARG_VALUE(AU,F,TYPE)	((TYPE)((AU)->F))
+#endif
+
+typedef struct {
+	const char *fmtpos;			/* TODO: move below struct?? */
+	struct printf_info info;
+	int maxposarg;				/* > 0 if args are positional, 0 if not, -1 if unknown */
+	int num_data_args;			/* TODO: use sentinal??? */
+	unsigned int conv_num;
+	unsigned char argnumber[4]; /* width | prec | 1st data | unused */
+	int argtype[MAX_ARGS];
+	va_list arg;
+#ifdef __va_arg_ptr
+	void *argptr[MAX_ARGS];
+#else
+	/* While this is wasteful of space in the case where pos args aren't
+	 * enabled, it is also needed to support custom printf handlers. */
+	argvalue_t argvalue[MAX_ARGS];
+#endif
+} ppfs_t;						/* parse printf format state */
+
+/**********************************************************************/
+
+/* TODO: fix printf to return 0 and set errno if format error.  Standard says
+   only returns -1 if sets error indicator for the stream. */
+
+/* TODO -- __isdigit() macro */
+#define __isdigit(c) (((unsigned int)(c - '0')) < 10)
+
+extern size_t _dtostr(FILE * fp, long double x, struct printf_info *info);
+
+#define _outnstr(stream, string, len)	_stdio_fwrite(s, len, stream)	/* TODO */
+
+extern int _do_one_spec(FILE * __restrict stream, ppfs_t *ppfs, int *count);
+
+extern int _ppfs_init(ppfs_t *ppfs, const char *fmt0); /* validates */
+extern void _ppfs_prepargs(ppfs_t *ppfs, va_list arg); /* sets posargptrs */
+extern void _ppfs_setargs(ppfs_t *ppfs); /* sets argptrs for current spec */
+extern int _ppfs_parsespec(ppfs_t *ppfs); /* parses specifier */
+
+/**********************************************************************/
+#ifdef L_parse_printf_format
+
+/* NOTE: This function differs from the glibc version in that parsing stops
+ * upon encountering an invalid conversion specifier.  Since this is the way
+ * my printf functions work, I think it makes sense to do it that way here.
+ * Unfortunately, since glibc sets the return type as size_t, we have no way
+ * of returning that the template is illegal, other than returning 0.
+ */
+
+size_t parse_printf_format(register const char *template,
+						   size_t n, int *argtypes)
+{
+	ppfs_t ppfs;
+	size_t i;
+	size_t count = 0;
+
+	if (_ppfs_init(&ppfs, template) >= 0) {
+		if (ppfs.maxposarg > 0)  { /* Using positional args. */
+			count = ppfs.maxposarg;
+			if (n > count) {
+				n = count;
+			}
+			for (i = 0 ; i < n ; i++) {
+				*argtypes++ = ppfs.argtype[i];
+			}
+		} else {				/* Not using positional args. */
+			while (*template) {
+				if ((*template == '%') && (*++template != '%')) {
+					ppfs.fmtpos = template;
+					_ppfs_parsespec(&ppfs); /* Can't fail. */
+					template = ppfs.fmtpos; /* Update to one past spec end. */
+					if (ppfs.info.width == INT_MIN) {
+						++count;
+						if (n > 0) {
+							*argtypes++ = PA_INT;
+							--n;
+						}
+					}
+					if (ppfs.info.prec == INT_MIN) {
+						++count;
+						if (n > 0) {
+							*argtypes++ = PA_INT;
+							--n;
+						}
+					}
+					for (i = 0 ; i < ppfs.num_data_args ; i++) {
+						if ((ppfs.argtype[i]) != __PA_NOARG) {
+							++count;
+							if (n > 0) {
+								*argtypes++ = ppfs.argtype[i];
+								--n;
+							}
+						}
+					}
+				} else {
+					++template;
+				}
+			}
+		}
+	}
+
+	return count;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_vfprintf
+
+/* We only support ascii digits (or their USC equivalent codes) in
+ * precision and width settings in *printf (wide) format strings.
+ * In other words, we don't currently support glibc's 'I' flag.
+ * We do accept it, but it is currently ignored. */
+
+/* TODO -- Implement grouping flag... on hold (locale support). */
+
+int vfprintf(FILE * __restrict stream, register const char * __restrict format,
+			 va_list arg)
+{
+	ppfs_t ppfs;
+	int count, r;
+	register const char *s;
+
+	__STDIO_THREADLOCK(stream);
+
+	count = 0;
+	s = format;
+
+	if (_ppfs_init(&ppfs, format) < 0) { /* Bad format string. */
+		_outnstr(stream, format, strlen(format));
+		count = -1;
+	} else {
+		_ppfs_prepargs(&ppfs, arg);
+
+		do {
+			while (*format && (*format != '%')) {
+				++format;
+			}
+
+			if (format-s) {		/* output any literal text in format string */
+				if ( (r = _outnstr(stream, s, format-s)) < 0) {
+					count = -1;
+					break;
+				}
+				count += r;
+			}
+
+			if (!*format) {			/* we're done */
+				break;
+			}
+		
+			if (format[1] != '%') {	/* if we get here, *format == '%' */
+				/* TODO: _do_one_spec needs to know what the output funcs are!!! */
+				ppfs.fmtpos = ++format;
+				/* TODO: check -- should only fail on stream error */
+				if ( (r = _do_one_spec(stream, &ppfs, &count)) < 0) {
+					count = -1;
+					break;
+				}
+				s = format = ppfs.fmtpos;
+			} else {			/* %% means literal %, so start new string */
+				s = ++format;
+				++format;
+			}
+		} while (1);
+	}
+
+	__STDIO_THREADUNLOCK(stream);
+
+	return count;
+}
+#endif
+/**********************************************************************/
+#ifdef L__ppfs_init
+
+int _ppfs_init(register ppfs_t *ppfs, const char *fmt0)
+{
+	int r;
+
+	/* First, zero out everything... argnumber[], argtype[], argptr[] */
+	memset(ppfs, 0, sizeof(ppfs_t)); /* TODO: nonportable???? */
+	--ppfs->maxposarg;			/* set to -1 */
+	/* now set all argtypes to no-arg */
+	{
+#if 1
+		/* TODO - use memset here since already "paid for"? */
+		register int *p = ppfs->argtype;
+		
+		r = MAX_ARGS;
+		do {
+			*p++ = __PA_NOARG;
+		} while (--r);
+#else
+		/* TODO -- get rid of this?? */
+		register char *p = (char *) ((MAX_ARGS-1) * sizeof(int));
+
+		do {
+			*((int *)(((char *)ppfs) + ((int)p) + offsetof(ppfs_t,argtype))) = __PA_NOARG;
+			p -= sizeof(int);
+		} while (p);
+#endif
+	}
+
+	/*
+	 * Run through the entire format string to validate it and initialize
+	 * the positional arg numbers (if any).
+	 */
+	{
+		register const char *fmt = fmt0;
+
+		while (*fmt) {
+			if ((*fmt == '%') && (*++fmt != '%')) {
+				ppfs->fmtpos = fmt; /* back up to the '%' */
+				if ((r = _ppfs_parsespec(ppfs)) < 0) {
+					return -1;
+				}
+				fmt = ppfs->fmtpos;	/* update to one past end of spec */
+			} else {
+				++fmt;
+			}
+		}
+		ppfs->fmtpos = fmt0;		/* rewind */
+	}
+
+	/* If we have positional args, make sure we know all the types. */
+	{
+		register int *p = ppfs->argtype;
+		r = ppfs->maxposarg;
+		while (--r >= 0) {
+			if ( *p == __PA_NOARG ) { /* missing arg type!!! */
+				return -1;
+			}
+			++p;
+		}
+	}
+
+	return 0;
+}
+#endif
+/**********************************************************************/
+#ifdef L__ppfs_prepargs
+void _ppfs_prepargs(register ppfs_t *ppfs, va_list arg)
+{
+	int i;
+
+	__va_copy(ppfs->arg, arg);
+
+	if ((i = ppfs->maxposarg) > 0)  { /* init for positional args */
+		ppfs->num_data_args = i;
+		ppfs->info.width = ppfs->info.prec = ppfs->maxposarg = 0;
+		_ppfs_setargs(ppfs);
+		ppfs->maxposarg = i;
+	}
+}
+#endif
+/**********************************************************************/
+#ifdef L__ppfs_setargs
+
+void _ppfs_setargs(register ppfs_t *ppfs)
+{
+#ifdef __va_arg_ptr
+	register void **p = ppfs->argptr;
+#else
+	register argvalue_t *p = ppfs->argvalue;
+#endif
+	int i;
+
+	if (ppfs->maxposarg == 0) {	/* initing for or no pos args */
+		if (ppfs->info.width == INT_MIN) {
+			ppfs->info.width =
+#ifdef __va_arg_ptr
+				*(int *)
+#endif
+				GET_VA_ARG(p,u,unsigned int,ppfs->arg);
+		} 
+		if (ppfs->info.prec == INT_MIN) {
+			ppfs->info.prec =
+#ifdef __va_arg_ptr
+				*(int *)
+#endif
+				GET_VA_ARG(p,u,unsigned int,ppfs->arg);
+		}
+		i = 0;
+		while (i < ppfs->num_data_args) {
+			switch(ppfs->argtype[i++]) {
+				case (PA_INT|PA_FLAG_LONG_LONG):
+#ifdef ULLONG_MAX
+					GET_VA_ARG(p,ull,unsigned long long,ppfs->arg);
+					break;
+#endif
+				case (PA_INT|PA_FLAG_LONG):
+#if ULONG_MAX != UINT_MAX
+					GET_VA_ARG(p,ul,unsigned long,ppfs->arg);
+					break;
+#endif
+				case PA_CHAR:	/* TODO - be careful */
+ 					/* ... users could use above and really want below!! */
+				case (PA_INT|__PA_FLAG_CHAR):/* TODO -- translate this!!! */
+				case (PA_INT|PA_FLAG_SHORT):
+				case PA_INT:
+					GET_VA_ARG(p,u,unsigned int,ppfs->arg);
+					break;
+				case PA_WCHAR:	/* TODO -- assume int? */
+					/* we're assuming wchar_t is at least an int */
+					GET_VA_ARG(p,wc,wchar_t,ppfs->arg);
+					break;
+#ifndef __BCC__
+					/* PA_FLOAT */
+				case PA_DOUBLE:
+					GET_VA_ARG(p,d,double,ppfs->arg);
+					break;
+				case (PA_DOUBLE|PA_FLAG_LONG_DOUBLE):
+					GET_VA_ARG(p,ld,long double,ppfs->arg);
+					break;
+#else
+				case PA_DOUBLE:
+				case (PA_DOUBLE|PA_FLAG_LONG_DOUBLE):
+					assert(0);
+#endif
+				default:
+					/* TODO -- really need to ensure this can't happen */
+					assert(ppfs->argtype[i-1] & PA_FLAG_PTR);
+				case PA_POINTER:
+				case PA_STRING:
+				case PA_WSTRING:
+					GET_VA_ARG(p,p,void *,ppfs->arg);
+					break;				
+				case __PA_NOARG:
+					continue;
+			}
+			++p;
+		}
+	} else {
+		if (ppfs->info.width == INT_MIN) {
+			ppfs->info.width
+				= (int) GET_ARG_VALUE(p + ppfs->argnumber[0] - 1,u,unsigned int);
+		} 
+		if (ppfs->info.prec == INT_MIN) {
+			ppfs->info.prec
+				= (int) GET_ARG_VALUE(p + ppfs->argnumber[1] - 1,u,unsigned int);
+		}
+	}
+
+	/* Now we know the width and precision. */
+	if (ppfs->info.width < 0) {
+		ppfs->info.width = -ppfs->info.width;
+		PRINT_INFO_SET_FLAG(&(ppfs->info),left);
+		PRINT_INFO_CLR_FLAG(&(ppfs->info),space);
+		ppfs->info.pad = ' ';
+	}
+#if 0
+	/* NOTE -- keep neg for now so float knows! */
+	if (ppfs->info.prec < 0) {	/* spec says treat as omitted. */
+		/* so use default prec... 1 for everything but floats and strings. */
+		ppfs->info.prec = 1;
+	}
+#endif
+}
+#endif
+/**********************************************************************/
+#ifdef L__ppfs_parsespec
+
+/* Notes: argtype differs from glibc for the following:
+ *         mine              glibc
+ *  lc     PA_WCHAR          PA_CHAR       the standard says %lc means %C
+ *  ls     PA_WSTRING        PA_STRING     the standard says %ls means %S
+ *  {*}n   {*}|PA_FLAG_PTR   PA_FLAG_PTR   size of n can be qualified
+ */
+
+/* TODO: store positions of positional args */
+
+/* TODO -- WARNING -- assumes aligned on integer boundaries!!! */
+
+/* TODO -- disable if not using positional args!!! */
+#define _OVERLAPPING_DIFFERENT_ARGS
+
+/* TODO -- rethink this -- perhaps we should set to largest type??? */
+
+#ifdef _OVERLAPPING_DIFFERENT_ARGS 
+
+#define PROMOTED_SIZE_OF(X)		((sizeof(X) + sizeof(int) - 1) / sizeof(X))
+
+static const short int type_codes[] = {
+	__PA_NOARG,					/* must be first entry */
+	PA_POINTER,
+	PA_STRING,
+	PA_WSTRING,
+	PA_CHAR,
+	PA_INT|PA_FLAG_SHORT,
+	PA_INT,
+	PA_INT|PA_FLAG_LONG,
+	PA_INT|PA_FLAG_LONG_LONG,
+	PA_WCHAR,
+#ifndef __BCC__
+	/* PA_FLOAT, */
+	PA_DOUBLE,
+	PA_DOUBLE|PA_FLAG_LONG_DOUBLE,
+#endif
+};
+
+static const unsigned char type_sizes[] = {
+	/* unknown type consumes no arg */
+	0,							/* must be first entry */
+	PROMOTED_SIZE_OF(void *),
+	PROMOTED_SIZE_OF(char *),
+	PROMOTED_SIZE_OF(wchar_t *),
+	PROMOTED_SIZE_OF(char),
+	PROMOTED_SIZE_OF(short),
+	PROMOTED_SIZE_OF(int),
+	PROMOTED_SIZE_OF(long),
+#ifdef ULLONG_MAX
+	PROMOTED_SIZE_OF(long long),
+#else
+	PROMOTED_SIZE_OF(long),		/* TODO -- is this correct? (above too) */
+#endif
+	PROMOTED_SIZE_OF(wchar_t),
+#ifndef __BCC__
+	/* PROMOTED_SIZE_OF(float), */
+	PROMOTED_SIZE_OF(double),
+	PROMOTED_SIZE_OF(long double),
+#endif
+};
+
+static int _promoted_size(int argtype)
+{
+	register const short int *p;
+
+	/* note -- since any unrecognized type is treated as a pointer */
+	p = type_codes + sizeof(type_codes)/sizeof(type_codes[0]);
+	do {
+		if (*--p == argtype) {
+			break;
+		}
+	} while (p > type_codes);
+
+	return type_sizes[(int)(p - type_codes)];
+}
+
+static int _is_equal_or_bigger_arg(int curtype, int newtype)
+{
+	/* Quick test */
+	if (newtype == __PA_NOARG) {
+		return 0;
+	}
+	if ((curtype == __PA_NOARG) || (curtype == newtype)) {
+		return 1;
+	}
+	/* Ok... slot is already filled and types are different in name. */
+	/* So, compare promoted sizes of curtype and newtype args. */
+	return _promoted_size(curtype) <= _promoted_size(newtype);
+}
+
+#else
+
+#define _is_equal_or_bigger_arg(C,N)	(((C) == __PA_NOARG) || ((C) == (N)))
+
+#endif
+
+/* TODO - do this differently? */
+static char _bss_custom_printf_spec[MAX_USER_SPEC]; /* 0-init'd for us.  */
+
+char *_custom_printf_spec = _bss_custom_printf_spec;
+printf_arginfo_function *_custom_printf_arginfo[MAX_USER_SPEC];
+
+extern int _ppfs_parsespec(ppfs_t *ppfs)
+{
+	register const char *fmt;
+	register const char *p;
+	int preci;
+	int width;
+	int flags;
+	int dataargtype;
+	int i;
+	int dpoint;
+	int maxposarg;
+	int p_m_spec_chars;
+	int n;
+	int argtype[MAX_ARGS_PER_SPEC+2];
+	int argnumber[3];			/* width, precision, 1st data arg */
+	unsigned int conv_num;
+	static const char spec_flags[] = SPEC_FLAGS;
+	static const char spec_chars[] = SPEC_CHARS;/* TODO: b? */
+	static const char spec_ranges[] = SPEC_RANGES;
+	static const short spec_or_mask[] = SPEC_OR_MASK;
+	static const short spec_and_mask[] = SPEC_AND_MASK;
+	static const char qual_chars[] = QUAL_CHARS;
+
+	/* WIDE note: we can test against '%' here since we don't allow */
+	/* WIDE note: other mappings of '%' in the wide char set. */
+	preci = -1;
+	width = flags = dpoint = 0;
+	argnumber[0] = 0;
+	argnumber[1] = 0;
+	argtype[0] = __PA_NOARG;
+	argtype[1] = __PA_NOARG;
+	maxposarg = ppfs->maxposarg;
+	fmt = ppfs->fmtpos;
+
+	assert(fmt[-1] == '%');
+	assert(fmt[0] != '%');
+
+	/* Process arg pos and/or flags and/or width and/or precision. */
+ width_precision:
+	p = fmt;
+	if (*fmt == '*') {
+		argtype[-dpoint] = PA_INT;
+		++fmt;
+	}
+	i = 0;
+	while (__isdigit(*fmt)) {
+		if (i < MAX_FIELD_WIDTH) { /* Avoid overflow. */
+			i = (i * 10) + (*fmt - '0');
+		}
+		++fmt;
+	}
+	if (p[-1] == '%') { /* Check for a position. */
+
+		/* TODO: if val not in range, then error */
+
+		if ((*fmt == '$') && (i > 0)) {/* Positional spec. */
+			++fmt;
+			if (maxposarg == 0) {
+				return -1;
+			}
+			if ((argnumber[2] = i) > maxposarg) {
+				maxposarg = i;
+			}
+			/* Now fall through to check flags. */
+		} else {
+			if (maxposarg > 0) {
+				return -1;
+			}
+			maxposarg = 0;		/* Possible redundant store, but cuts size. */
+
+			if ((fmt > p) && (*p != '0')) {
+				goto PREC_WIDTH;
+			}
+
+			fmt = p;			/* Back up for possible '0's flag. */
+			/* Now fall through to check flags. */
+		}
+
+	restart_flags:		/* Process flags. */
+		i = 1;
+		p = spec_flags;
+	
+		do {
+			if (*fmt == *p++) {
+				++fmt;
+				flags |= i;
+				goto restart_flags;
+			}
+			i += i;				/* Better than i <<= 1 for bcc */
+		} while (*p);
+		i = 0;
+
+		/* If '+' then ignore ' ', and if '-' then ignore '0'. */
+		/* Note: Need to ignore '0' when prec is an arg with val < 0, */
+		/*       but that test needs to wait until the arg is retrieved. */
+		flags &= ~((flags & (FLAG_PLUS|FLAG_MINUS)) >> 1);
+		/* Note: Ignore '0' when prec is specified < 0 too (in printf). */
+
+		if (fmt[-1] != '%') {	/* If we've done anything, loop for width. */
+			goto width_precision;
+		}
+	}
+ PREC_WIDTH:
+	if (*p == '*') {			/* Prec or width takes an arg. */
+		if (maxposarg) {
+			if ((*fmt++ != '$') || (i <= 0)) {
+				/* Using pos args and no $ or invalid arg number. */
+				return -1;
+			}
+			argnumber[-dpoint] = i;
+		} else if (++p != fmt) {
+			 /* Not using pos args but digits followed *. */
+			return -1;
+		}
+		i = INT_MIN;
+	}
+
+	if (!dpoint) {
+		width = i;
+		if (*fmt == '.') {
+			++fmt;
+			dpoint = -1;		/* To use as default precison. */
+			goto width_precision;
+		}
+	} else {
+		preci = i;
+	}
+
+	/* Process qualifier. */
+	p = qual_chars;
+	do {
+		if (*fmt == *p) {
+			++fmt;
+			break;
+		}
+	} while (*++p);
+	if ((p - qual_chars < 2) && (*fmt == *p)) {
+		p += ((sizeof(qual_chars)-2) / 2);
+		++fmt;
+	}
+	dataargtype = ((int)(p[(sizeof(qual_chars)-2) / 2])) << 8;
+
+	/* Process conversion specifier. */
+	if (!*fmt) {
+		return -1;
+	}
+
+	p = spec_chars;
+
+	do {
+		if (*fmt == *p) {
+			p_m_spec_chars = p - spec_chars;
+
+			if ((p_m_spec_chars >= CONV_c)
+				&& (dataargtype & PA_FLAG_LONG)) {
+				p_m_spec_chars -= 2; /* lc -> C and ls -> S */
+			}
+
+			conv_num = p_m_spec_chars;
+			p = spec_ranges-1;
+			while (p_m_spec_chars > *++p) {}
+
+			i = p - spec_ranges;
+			argtype[2] = (dataargtype | spec_or_mask[i]) & spec_and_mask[i];
+			p = spec_chars;
+			break;
+		}
+	} while(*++p);
+
+	ppfs->info.spec = *fmt;
+	ppfs->info.prec = preci;
+	ppfs->info.width = width;
+	ppfs->info.pad = ((flags & FLAG_ZERO) ? '0' : ' ');
+	ppfs->info._flags = (flags & ~FLAG_ZERO) | (dataargtype & __PA_INTMASK);
+	ppfs->num_data_args = 1;
+
+	if (!*p) {
+#ifdef __STDIO_GLIBC_CUSTOM_PRINTF
+		/* TODO -- gnu %m support build option. */
+		if (*fmt == 'm') {
+			conv_num = CONV_m;
+			ppfs->num_data_args = 0;
+			goto DONE;
+		}
+
+		/* Handle custom arg -- WARNING -- overwrites p!!! */
+		conv_num = CONV_custom0;
+		p = _custom_printf_spec;
+		do {
+			if (*p == *fmt) {
+				if ((ppfs->num_data_args
+					 = ((*_custom_printf_arginfo[(int)(p-_custom_printf_spec)])
+						(&(ppfs->info), MAX_ARGS_PER_SPEC, argtype+2)))
+					> MAX_ARGS_PER_SPEC) {
+					break;		/* Error -- too many args! */
+				}
+				goto DONE;
+			}
+		} while (++p < (_custom_printf_spec + MAX_USER_SPEC));
+#endif /* __STDIO_GLIBC_CUSTOM_PRINTF */
+		/* Otherwise error. */
+		return -1;
+	}
+		
+#ifdef __STDIO_GLIBC_CUSTOM_PRINTF
+ DONE:
+#endif
+
+	if (maxposarg > 0) {
+		i = 0;
+		do {
+			/* Update maxposarg and check that NL_ARGMAX is not exceeded. */
+			n = ((i <= 2)
+				 ? (ppfs->argnumber[i] = argnumber[i])
+				 : argnumber[2] + (i-2));
+			if (n > maxposarg) {
+				if ((maxposarg = n) > NL_ARGMAX) {
+					return -1;
+				}
+			}
+			--n;
+			/* Record argtype with largest size (current, new). */
+			if (_is_equal_or_bigger_arg(ppfs->argtype[n], argtype[i])) {
+				ppfs->argtype[n] = argtype[i];
+			}
+		} while (++i < ppfs->num_data_args + 2);
+	} else {
+		ppfs->argnumber[2] = 1;
+		memcpy(ppfs->argtype, argtype + 2, ppfs->num_data_args * sizeof(int));
+	}
+
+	ppfs->maxposarg = maxposarg;
+	ppfs->fmtpos = ++fmt;
+	ppfs->conv_num = conv_num;
+
+ 	return ppfs->num_data_args + 2;
+}
+
+#endif
+/**********************************************************************/
+#ifdef L_register_printf_function
+
+int register_printf_function(int spec, printf_function handler,
+							 printf_arginfo_function arginfo)
+{
+	register char *r;
+	register char *p;
+
+	if (spec && (arginfo != NULL)) { /* TODO -- check if spec is valid char */
+		r = NULL;
+		p = _custom_printf_spec + MAX_USER_SPEC;
+		do {
+			--p;
+			if (!*p) {
+				r = p;
+			}
+#ifdef __BCC__
+			else				/* bcc generates less code with fall-through */
+#endif
+			if (*p == spec) {
+				r = p;
+				p = _custom_printf_spec;
+			}
+		} while (p > _custom_printf_spec);
+
+		if (r) {
+			if (handler) {
+				*r = spec;
+				_custom_printf_handler[(int)(r - p)] = handler;
+				_custom_printf_arginfo[(int)(r - p)] = arginfo;
+			} else {
+				*r = 0;
+			}
+			return 0;
+		}
+		/* TODO -- if asked to unregister a non-existent spec, return what? */
+	}
+	return -1;
+}
+#endif
+/**********************************************************************/
+#ifdef L__do_one_spec
+
+printf_function *_custom_printf_handler[MAX_USER_SPEC];
+
+extern void _store_inttype(void *dest, int desttype, uintmax_t val);
+extern uintmax_t _load_inttype(int desttype, const void *src, int uflag);
+extern void _charpad(FILE * __restrict stream, char padchar, size_t numpad);
+extern void output(FILE * __restrict stream, const char *s);
+
+#define output(F,S)			fputs(S,F)
+
+#undef putc
+void _charpad(FILE * __restrict stream, char padchar, size_t numpad)
+{
+	/* TODO -- Use a buffer to cut down on function calls... */
+	char pad[1];
+
+	*pad = padchar;
+	while (numpad) {
+		_stdio_fwrite(pad, 1, stream);
+		--numpad;
+	}
+}
+
+/* TODO -- Dynamically allocate work space to accomodate stack-poor archs? */
+
+int _do_one_spec(FILE * __restrict stream, register ppfs_t *ppfs, int *count)
+{
+	static const char spec_base[] = SPEC_BASE;
+	static const char prefix[] = "+\0-\0 \0000x\0000X";
+	/*                            0  2  4  6   9 11*/
+	enum {
+		PREFIX_PLUS = 0,
+		PREFIX_MINUS = 2,
+		PREFIX_SPACE = 4,
+		PREFIX_LWR_X = 6,
+		PREFIX_UPR_X = 9,
+		PREFIX_NONE = 11
+	};
+
+#ifdef __va_arg_ptr
+	const void * const *argptr;
+#else
+	const void * argptr[MAX_ARGS_PER_SPEC];
+#endif
+	int *argtype;
+	size_t slen;
+	int base;
+	int numpad;
+	int numfill = 0;			/* TODO: fix */
+	int prefix_num = PREFIX_NONE;
+	char padchar = ' ';
+	char buf[64];
+
+#ifdef NDEBUG
+	_ppfs_parsespec(ppfs);
+#else
+	if (_ppfs_parsespec(ppfs) < 0) { /* TODO: just for debugging */
+		abort();
+	}
+#endif
+	_ppfs_setargs(ppfs);
+
+	argtype = ppfs->argtype + ppfs->argnumber[2] - 1;
+	/* Deal with the argptr vs argvalue issue. */
+#ifdef __va_arg_ptr
+	argptr = (const void * const *) ppfs->argptr;
+	if (ppfs->maxposarg > 0) {	/* Using positional args... */
+		argptr += ppfs->argnumber[2] - 1;
+	}
+#else
+	/* Need to build a local copy... */
+	{
+		register argvalue_t *p = ppfs->argvalue;
+		int i;
+		if (ppfs->maxposarg > 0) {	/* Using positional args... */
+			p += ppfs->argnumber[2] - 1;
+		}
+		for (i = 0 ; i < ppfs->num_data_args ; i++ ) {
+			argptr[i] = (void *) p++;
+		}
+	}
+#endif
+	{
+		register char *s;
+
+		if (ppfs->conv_num == CONV_n) {
+			_store_inttype(*(void **)*argptr,
+						   ppfs->info._flags & __PA_INTMASK,
+						   (intmax_t) (*count));
+			return 0;
+		}
+		if (ppfs->conv_num <= CONV_i) {	/* pointer or (un)signed int */
+			base = spec_base[(int)(ppfs->conv_num - CONV_p)];
+			if (ppfs->conv_num <= CONV_u) { /* pointer or unsigned int */
+				if (ppfs->conv_num == CONV_p) { /* pointer */
+					prefix_num = PREFIX_LWR_X;
+				} else {		/* unsigned int */
+				}
+			} else {			/* signed int */
+				base = -base;
+			}
+			if (ppfs->info.prec < 0) { /* Ignore '0' flag if prec specified. */
+				padchar = ppfs->info.pad;
+			}
+			s = _uintmaxtostr(buf + sizeof(buf) - 1,
+							  (uintmax_t)
+							  _load_inttype(*argtype & __PA_INTMASK,
+											*argptr, base), base,
+							  ((ppfs->conv_num == CONV_X)
+							   ? __UIM_UPPER : __UIM_LOWER));
+			if (ppfs->conv_num > CONV_u) { /* signed int */
+				if (*s == '-') {
+					PRINT_INFO_SET_FLAG(&(ppfs->info),showsign);
+					++s;		/* handle '-' in the prefix string */
+					prefix_num = PREFIX_MINUS;
+				} else if (PRINT_INFO_FLAG_VAL(&(ppfs->info),showsign)) {
+					prefix_num = PREFIX_PLUS;
+				} else if (PRINT_INFO_FLAG_VAL(&(ppfs->info),space)) {
+					prefix_num = PREFIX_SPACE;
+				}
+			}
+			slen = (char *)(buf + sizeof(buf) - 1) - s;
+			numfill = ((ppfs->info.prec < 0) ? 1 : ppfs->info.prec);
+			if (PRINT_INFO_FLAG_VAL(&(ppfs->info),alt)) {
+				if (ppfs->conv_num <= CONV_x) {	/* x or p */
+					prefix_num = PREFIX_LWR_X;
+				}
+				if (ppfs->conv_num == CONV_X) {
+					prefix_num = PREFIX_UPR_X;
+				}
+				if ((ppfs->conv_num == CONV_o) && (numfill < slen)) {
+					numfill = ((*s == '0') ? 1 : slen + 1);
+				}
+			}
+			if (*s == '0') {
+				if (prefix_num >= PREFIX_LWR_X) {
+					prefix_num = PREFIX_NONE;
+				}
+				if (ppfs->conv_num == CONV_p) {/* null pointer */
+					s = "(nil)";
+					slen = 5;
+					numfill = 0;
+				} else if (numfill == 0) {	/* if precision 0, no output */
+					slen = 0;
+				}
+			}
+			numfill = ((numfill > slen) ? numfill - slen : 0);
+		} else if (ppfs->conv_num <= CONV_A) {	/* floating point */
+			*count += _dtostr(stream,
+							  (PRINT_INFO_FLAG_VAL(&(ppfs->info),is_long_double)
+							   ? *(long double *) *argptr
+							   : (long double) (* (double *) *argptr)),
+							  &ppfs->info);
+			return 0;
+		} else if (ppfs->conv_num <= CONV_S) {	/* wide char or string */
+#if 1
+			return -1;			/* TODO -- wide */
+#else
+			if (ppfs->conv_num == CONV_S) { /* wide string */
+
+			} else {			/* wide char */
+				
+			}
+#endif
+		} else if (ppfs->conv_num <= CONV_s) {	/* char or string */
+			if (ppfs->conv_num == CONV_s) { /* string */
+				s = *((char **) (*argptr));
+				if (s) {
+				SET_STRING_LEN:
+					slen = strnlen(s, ((ppfs->info.prec >= 0)
+									   ? ppfs->info.prec : SIZE_MAX));
+				} else {
+					s = "(null)";
+					slen = 6;
+				}
+			} else {			/* char */
+				s = (char *) buf;
+				*s = *((const char *) *argptr);
+				s[1] = 0;
+				slen = 1;
+			}
+		} else if (ppfs->conv_num == CONV_m) {
+			s = strerror(errno);
+			goto SET_STRING_LEN;
+		} else {
+			assert(ppfs->conv_num == CONV_custom0);
+
+			s = _custom_printf_spec;
+			do {
+				if (*s == ppfs->info.spec) {
+					int rv;
+					/* TODO -- check return value for sanity? */
+					rv = (*_custom_printf_handler
+						  [(int)(s-_custom_printf_spec)])
+						(stream, &ppfs->info, argptr);
+					if (rv < 0) {
+						return -1;
+					}
+					*count += rv;
+					return 0;
+				}
+			} while (++s < (_custom_printf_spec + MAX_USER_SPEC));
+			assert(0);
+			return -1;
+		}
+
+		{
+			size_t t;
+
+			t = slen + numfill;
+			if (prefix_num != PREFIX_NONE) {
+				t += ((prefix_num < PREFIX_LWR_X) ? 1 : 2);