/***
*output.c - printf style output to a struct w4io
*
* Copyright (c) 1989-1991, Microsoft Corporation. All rights reserved.
*
*Purpose:
* This file contains the code that does all the work for the
* printf family of functions. It should not be called directly, only
* by the *printf functions. We don't make any assumtions about the
* sizes of ints, longs, shorts, or long doubles, but if types do overlap, we
* also try to be efficient. We do assume that pointers are the same size
* as either ints or longs.
*
*Revision History:
* 06-01-89 PHG Module created
* 08-28-89 JCR Added cast to get rid of warning (no object changes)
* 02-15-90 GJF Fixed copyright
* 10-03-90 WHB Defined LOCAL(x) to "static x" for local procedures
*
*******************************************************************************/
#if DBG == 1
#include <limits.h>
#include <string.h>
#include <stdarg.h>
#include "w4io.h"
/* this macro defines a function which is private and as fast as possible: */
/* for example, in C 6.0, it might be static _fastcall <type>. */
#define LOCAL(x) static x // 100390--WHB
#define NOFLOATS // Win 4 doesn't need floating point
/* int/long/short/pointer sizes */
/* the following should be set depending on the sizes of various types */
// FLAT or LARGE model is assumed
#ifdef FLAT
# define LONG_IS_INT 1 /* 1 means long is same size as int */
# define SHORT_IS_INT 0 /* 1 means short is same size as int */
# define PTR_IS_INT 1 /* 1 means ptr is same size as int */
# define PTR_IS_LONG 0 /* 1 means ptr is same size as long */
#else // LARGE model
# define LONG_IS_INT 0 /* 1 means long is same size as int */
# define SHORT_IS_INT 1 /* 1 means short is same size as int */
# define PTR_IS_INT 0 /* 1 means ptr is same size as int */
# define PTR_IS_LONG 1 /* 1 means ptr is same size as long */
#endif
#define LONGDOUBLE_IS_DOUBLE 0 /* 1 means long double is same as double */
#if LONG_IS_INT
#define get_long_arg(x) (long)get_int_arg(x)
#endif
#if PTR_IS_INT
#define get_ptr_arg(x) (void FAR *)get_int_arg(x)
#elif PTR_IS_LONG
#define get_ptr_arg(x) (void FAR *)get_long_arg(x)
#else
#error Size of pointer must be same as size of int or long
#endif
#ifndef NOFLOATS
/* These are "fake" double and long doubles to fool the compiler,
so we don't drag in floating point. */
typedef struct {
char x[sizeof(double)];
} DOUBLE;
typedef struct {
char x[sizeof(long double)];
} LONGDOUBLE;
#endif
/* CONSTANTS */
//#define BUFFERSIZE CVTBUFSIZE /* buffer size for maximum double conv */
#define BUFFERSIZE 20
/* flag definitions */
#define FL_SIGN 0x0001 /* put plus or minus in front */
#define FL_SIGNSP 0x0002 /* put space or minus in front */
#define FL_LEFT 0x0004 /* left justify */
#define FL_LEADZERO 0x0008 /* pad with leading zeros */
#define FL_LONG 0x0010 /* long value given */
#define FL_SHORT 0x0020 /* short value given */
#define FL_SIGNED 0x0040 /* signed data given */
#define FL_ALTERNATE 0x0080 /* alternate form requested */
#define FL_NEGATIVE 0x0100 /* value is negative */
#define FL_FORCEOCTAL 0x0200 /* force leading '0' for octals */
#define FL_LONGDOUBLE 0x0400 /* long double value given */
#define FL_WIDE 0x0800 /* wide character/string given */
/* state definitions */
enum STATE {
ST_NORMAL, /* normal state; outputting literal chars */
ST_PERCENT, /* just read '%' */
ST_FLAG, /* just read flag character */
ST_WIDTH, /* just read width specifier */
ST_DOT, /* just read '.' */
ST_PRECIS, /* just read precision specifier */
ST_SIZE, /* just read size specifier */
ST_TYPE /* just read type specifier */
};
#define NUMSTATES (ST_TYPE + 1)
/* character type values */
enum CHARTYPE {
CH_OTHER, /* character with no special meaning */
CH_PERCENT, /* '%' */
CH_DOT, /* '.' */
CH_STAR, /* '*' */
CH_ZERO, /* '0' */
CH_DIGIT, /* '1'..'9' */
CH_FLAG, /* ' ', '+', '-', '#' */
CH_SIZE, /* 'h', 'l', 'L', 'N', 'F' */
CH_TYPE /* type specifying character */
};
/* static data (read only, since we are re-entrant) */
char *nullstring = "(null)"; /* string to print on null ptr */
/* The state table. This table is actually two tables combined into one. */
/* The lower nybble of each byte gives the character class of any */
/* character; while the uper nybble of the byte gives the next state */
/* to enter. See the macros below the table for details. */
/* */
/* The table is generated by maketab.c -- use the maketab program to make */
/* changes. */
static char lookuptable[] = {
0x06, 0x00, 0x00, 0x06, 0x00, 0x01, 0x00, 0x00,
0x10, 0x00, 0x03, 0x06, 0x00, 0x06, 0x02, 0x10,
0x04, 0x45, 0x45, 0x45, 0x05, 0x05, 0x05, 0x05,
0x05, 0x35, 0x30, 0x00, 0x50, 0x00, 0x00, 0x00,
0x00, 0x20, 0x28, 0x38, 0x50, 0x58, 0x07, 0x08,
0x00, 0x30, 0x30, 0x30, 0x57, 0x50, 0x07, 0x00,
0x00, 0x20, 0x20, 0x08, 0x00, 0x00, 0x00, 0x00,
0x08, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x00,
0x00, 0x70, 0x70, 0x78, 0x78, 0x78, 0x78, 0x08,
0x07, 0x08, 0x00, 0x00, 0x07, 0x00, 0x08, 0x08,
0x08, 0x00, 0x00, 0x08, 0x00, 0x08, 0x00, 0x07,
0x08
};
#define find_char_class(c) \
((c) < ' ' || (c) > 'x' ? \
CH_OTHER \
: \
lookuptable[(c)-' '] & 0xF)
#define find_next_state(class, state) \
(lookuptable[(class) * NUMSTATES + (state)] >> 4)
#if !LONG_IS_INT
LOCAL(long) get_long_arg(va_list FAR *pargptr);
#endif
LOCAL(int) get_int_arg(va_list FAR *pargptr);
LOCAL(void) writestring(char FAR *string,
int len,
struct w4io FAR *f,
int FAR *pcchwritten,
int fwide);
#ifndef NOFLOATS
/* extern float convert routines */
typedef int (FAR * PFI)();
extern PFI _cfltcvt_tab[5];
#define _cfltcvt(a,b,c,d,e) (*_cfltcvt_tab[0])(a,b,c,d,e)
#define _cropzeros(a) (*_cfltcvt_tab[1])(a)
#define _fassign(a,b,c) (*_cfltcvt_tab[2])(a,b,c)
#define _forcdecpt(a) (*_cfltcvt_tab[3])(a)
#define _positive(a) (*_cfltcvt_tab[4])(a)
#define _cldcvt(a,b,c,d,e) (*_cfltcvt_tab[5])(a,b,c,d,e)
#endif
/***
*int w4iooutput(f, format, argptr)
*
*Purpose:
* Output performs printf style output onto a stream. It is called by
* printf/fprintf/sprintf/vprintf/vfprintf/vsprintf to so the dirty
* work. In multi-thread situations, w4iooutput assumes that the given
* stream is already locked.
*
* Algorithm:
* The format string is parsed by using a finite state automaton
* based on the current state and the current character read from
* the format string. Thus, looping is on a per-character basis,
* not a per conversion specifier basis. Once the format specififying
* character is read, output is performed.
*
*Entry:
* struct w4io *f - stream for output
* char *format - printf style format string
* va_list argptr - pointer to list of subsidiary arguments
*
*Exit:
* Returns the number of characters written, or -1 if an output error
* occurs.
*
*Exceptions:
*
*******************************************************************************/
int _cdecl w4iooutput(struct w4io FAR *f, const char FAR *format, va_list argptr)
{
int hexadd; /* offset to add to number to get 'a'..'f' */
char ch; /* character just read */
wchar_t wc; /* wide character temp */
wchar_t FAR *pwc; /* wide character temp pointer */
int flags; /* flag word -- see #defines above for flag values */
enum STATE state; /* current state */
enum CHARTYPE chclass; /* class of current character */
int radix; /* current conversion radix */
int charsout; /* characters currently written so far, -1 = IO error */
int fldwidth; /* selected field with -- 0 means default */
int fwide;
int precision; /* selected precision -- -1 means default */
char prefix[2]; /* numeric prefix -- up to two characters */
int prefixlen; /* length of prefix -- 0 means no prefix */
int capexp; /* non-zero = 'E' exponent signifiet, zero = 'e' */
int no_output; /* non-zero = prodcue no output for this specifier */
char FAR *text; /* pointer text to be printed, not zero terminated */
char FAR *text2; /* pointer text to be printed, not zero terminated */
int textlen; /* length of the text to be printed */
char buffer[BUFFERSIZE]; /* buffer for conversions */
charsout = 0; /* no characters written yet */
state = ST_NORMAL; /* starting state */
/* main loop -- loop while format character exist and no I/O errors */
while ((ch = *format++) != '\0' && charsout >= 0) {
chclass = find_char_class(ch); /* find character class */
state = find_next_state(chclass, state); /* find next state */
/* execute code for each state */
switch (state) {
case ST_NORMAL:
/* normal state -- just write character */
f->writechar(ch, 1, f, &charsout);
break;
case ST_PERCENT:
/* set default value of conversion parameters */
prefixlen = fldwidth = no_output = capexp = 0;
flags = 0;
precision = -1;
fwide = 0;
break;
case ST_FLAG:
/* set flag based on which flag character */
switch (ch) {
case '-':
flags |= FL_LEFT; /* '-' => left justify */
break;
case '+':
flags |= FL_SIGN; /* '+' => force sign indicator */
break;
case ' ':
flags |= FL_SIGNSP; /* ' ' => force sign or space */
break;
case '#':
flags |= FL_ALTERNATE; /* '#' => alternate form */
break;
case '0':
flags |= FL_LEADZERO; /* '0' => pad with leading zeros */
break;
}
break;
case ST_WIDTH:
/* update width value */
if (ch == '*') {
/* get width from arg list */
fldwidth = get_int_arg(&argptr);
if (fldwidth < 0) {
/* ANSI says neg fld width means '-' flag and pos width */
flags |= FL_LEFT;
fldwidth = -fldwidth;
}
}
else {
/* add digit to current field width */
fldwidth = fldwidth * 10 + (ch - '0');
}
break;
case ST_DOT:
/* zero the precision, since dot with no number means 0
not default, according to ANSI */
precision = 0;
break;
case ST_PRECIS:
/* update precison value */
if (ch == '*') {
/* get precision from arg list */
precision = get_int_arg(&argptr);
if (precision < 0)
precision = -1; /* neg precision means default */
}
else {
/* add digit to current precision */
precision = precision * 10 + (ch - '0');
}
break;
case ST_SIZE:
/* just read a size specifier, set the flags based on it */
switch (ch) {
#if !LONG_IS_INT
case 'l':
flags |= FL_LONG; /* 'l' => long int */
break;
#endif
#if !LONGDOUBLE_IS_DOUBLE
case 'L':
flags |= FL_LONGDOUBLE; /* 'L' => long double */
break;
#endif
#if !SHORT_IS_INT
case 'h':
flags |= FL_SHORT; /* 'h' => short int */
break;
#endif
case 'w':
flags |= FL_WIDE; /* 'w' => wide character */
break;
}
break;
case ST_TYPE:
/* we have finally read the actual type character, so we */
/* now format and "print" the output. We use a big switch */
/* statement that sets 'text' to point to the text that should */
/* be printed, and 'textlen' to the length of this text. */
/* Common code later on takes care of justifying it and */
/* other miscellaneous chores. Note that cases share code, */
/* in particular, all integer formatting is doen in one place. */
/* Look at those funky goto statements! */
switch (ch) {
case 'c': {
/* print a single character specified by int argument */
wc = (wchar_t) get_int_arg(&argptr); /* get char to print */
* (wchar_t FAR *) buffer = wc;
text = buffer;
textlen = 1; /* print just a single character */
}
break;
case 'S': {
/* print a Counted String
int i;
char FAR *p; /* temps */
struct string {
short Length;
short MaximumLength;
char FAR *Buffer;
} *pstr;
pstr = get_ptr_arg(&argptr);
if (pstr == NULL || pstr->Buffer == NULL) {
/* null ptr passed, use special string */
text = nullstring;
#ifdef FLAT
textlen = strlen(text);
#else
textlen = _fstrlen(text);
#endif
flags &= ~FL_WIDE;
} else {
text = pstr->Buffer;
textlen = pstr->Length;
}
}
break;
case 's': {
/* print a string -- */
/* ANSI rules on how much of string to print: */
/* all if precision is default, */
/* min(precision, length) if precision given. */
/* prints '(null)' if a null string is passed */
int i;
char FAR *p; /* temps */
text = get_ptr_arg(&argptr);
if (text == NULL) {
/* null ptr passed, use special string */
text = nullstring;
flags &= ~FL_WIDE;
}
/* At this point it is tempting to use strlen(), but */
/* if a precision is specified, we're not allowed to */
/* scan past there, because there might be no null */
/* at all. Thus, we must do our own scan. */
i = (precision == -1) ? INT_MAX : precision;
/* scan for null upto i characters */
if (flags & FL_WIDE) {
pwc = (wchar_t FAR *) text;
while (i-- && (wc = *pwc) && (wc & 0x00ff)) {
++pwc;
if (wc & 0xff00) { // if high byte set,
break; // error will be indicated
}
}
textlen = (int) (pwc - (wchar_t FAR *) text) ; /* length of string */
} else {
p = text;
while (i-- && *p) {
++p;
}
textlen = (int) (p - text); /* length of the string */
}
}
break;
case 'n': {
/* write count of characters seen so far into */
/* short/int/long thru ptr read from args */
void FAR *p; /* temp */
p = get_ptr_arg(&argptr);
/* store chars out into short/long/int depending on flags */
#if !LONG_IS_INT
if (flags & FL_LONG)
*(long FAR *)p = charsout;
else
#endif
#if !SHORT_IS_INT
if (flags & FL_SHORT)
*(short FAR *)p = (short) charsout;
else
#endif
*(int FAR *)p = charsout;
no_output = 1; /* force no output */
}
break;
#ifndef NOFLOATS
case 'E':
case 'G':
capexp = 1; /* capitalize exponent */
ch += 'a' - 'A'; /* convert format char to lower */
/* DROP THROUGH */
case 'e':
case 'f':
case 'g': {
/* floating point conversion -- we call cfltcvt routines */
/* to do the work for us. */
flags |= FL_SIGNED; /* floating point is signed conversion */
text = buffer; /* put result in buffer */
flags &= ~FL_WIDE; /* 8 bit string */
/* compute the precision value */
if (precision < 0)
precision = 6; /* default precision: 6 */
else if (precision == 0 && ch == 'g')
precision = 1; /* ANSI specified */
#if !LONGDOUBLE_IS_DOUBLE
/* do the conversion */
if (flags & FL_LONGDOUBLE) {
_cldcvt(argptr, text, ch, precision, capexp);
va_arg(argptr, LONGDOUBLE);
}
else
#endif
{
_cfltcvt(argptr, text, ch, precision, capexp);
va_arg(argptr, DOUBLE);
}
/* '#' and precision == 0 means force a decimal point */
if ((flags & FL_ALTERNATE) && precision == 0)
_forcdecpt(text);
/* 'g' format means crop zero unless '#' given */
if (ch == 'g' && !(flags & FL_ALTERNATE))
_cropzeros(text);
/* check if result was negative, save '-' for later */
/* and point to positive part (this is for '0' padding) */
if (*text == '-') {
flags |= FL_NEGATIVE;
++text;
}
textlen = strlen(text); /* compute length of text */
}
break;
#endif // NOFLOATS
case 'd':
case 'i':
/* signed decimal output */
flags |= FL_SIGNED;
radix = 10;
goto COMMON_INT;
case 'u':
radix = 10;
goto COMMON_INT;
case 'p':
/* write a pointer -- this is like an integer or long */
/* except we force precision to pad with zeros and */
/* output in big hex. */
precision = 2 * sizeof(void FAR *); /* number of hex digits needed */
#if !PTR_IS_INT
flags |= FL_LONG; /* assume we're converting a long */
#endif
/* DROP THROUGH to hex formatting */
case 'C':
case 'X':
/* unsigned upper hex output */
hexadd = 'A' - '9' - 1; /* set hexadd for uppercase hex */
goto COMMON_HEX;
case 'x':
/* unsigned lower hex output */
hexadd = 'a' - '9' - 1; /* set hexadd for lowercase hex */
/* DROP THROUGH TO COMMON_HEX */
COMMON_HEX:
radix = 16;
if (flags & FL_ALTERNATE) {
/* alternate form means '0x' prefix */
prefix[0] = '0';
prefix[1] = (char)('x' - 'a' + '9' + 1 + hexadd); /* 'x' or 'X' */
prefixlen = 2;
}
goto COMMON_INT;
case 'o':
/* unsigned octal output */
radix = 8;
if (flags & FL_ALTERNATE) {
/* alternate form means force a leading 0 */
flags |= FL_FORCEOCTAL;
}
/* DROP THROUGH to COMMON_INT */
COMMON_INT: {
/* This is the general integer formatting routine. */
/* Basically, we get an argument, make it positive */
/* if necessary, and convert it according to the */
/* correct radix, setting text and textlen */
/* appropriately. */
unsigned long number; /* number to convert */
int digit; /* ascii value of digit */
long l; /* temp long value */
/* 1. read argument into l, sign extend as needed */
#if !LONG_IS_INT
if (flags & FL_LONG)
l = get_long_arg(&argptr);
else
#endif
#if !SHORT_IS_INT
if (flags & FL_SHORT) {
if (flags & FL_SIGNED)
l = (short) get_int_arg(&argptr); /* sign extend */
else
l = (unsigned short) get_int_arg(&argptr); /* zero-extend*/
}
else
#endif
{
if (flags & FL_SIGNED)
l = get_int_arg(&argptr); /* sign extend */
else
l = (unsigned int) get_int_arg(&argptr); /* zero-extend*/
}
/* 2. check for negative; copy into number */
if ( (flags & FL_SIGNED) && l < 0) {
number = -l;
flags |= FL_NEGATIVE; /* remember negative sign */
}
else {
number = l;
}
/* 3. check precision value for default; non-default */
/* turns off 0 flag, according to ANSI. */
if (precision < 0)
precision = 1; /* default precision */
else
flags &= ~FL_LEADZERO;
/* 4. Check if data is 0; if so, turn off hex prefix */
if (number == 0)
prefixlen = 0;
/* 5. Convert data to ASCII -- note if precision is zero */
/* and number is zero, we get no digits at all. */
text2 = text = &buffer[BUFFERSIZE-1]; // last digit at end of buffer
flags &= ~FL_WIDE; // 8 bit characters
while (precision-- > 0 || number != 0) {
digit = (int)(number % radix) + '0';
number /= radix; /* reduce number */
if (digit > '9') {
/* a hex digit, make it a letter */
digit += hexadd;
}
*text-- = (char)digit; /* store the digit */
}
textlen = text2 - text; /* compute length of number */
++text; /* text points to first digit now */
/* 6. Force a leading zero if FORCEOCTAL flag set */
if ((flags & FL_FORCEOCTAL) && (text[0] != '0' || textlen == 0)) {
*--text = '0';
++textlen; /* add a zero */
}
}
break;
}
/* At this point, we have done the specific conversion, and */
/* 'text' points to text to print; 'textlen' is length. Now we */
/* justify it, put on prefixes, leading zeros, and then */
/* print it. */
if (!no_output) {
int padding; /* amount of padding, negative means zero */
if (flags & FL_SIGNED) {
if (flags & FL_NEGATIVE) {
/* prefix is a '-' */
prefix[0] = '-';
prefixlen = 1;
}
else if (flags & FL_SIGN) {
/* prefix is '+' */
prefix[0] = '+';
prefixlen = 1;
}
else if (flags & FL_SIGNSP) {
/* prefix is ' ' */
prefix[0] = ' ';
prefixlen = 1;
}
}
/* calculate amount of padding -- might be negative, */
/* but this will just mean zero */
padding = fldwidth - textlen - prefixlen;
/* put out the padding, prefix, and text, in the correct order */
if (!(flags & (FL_LEFT | FL_LEADZERO))) {
/* pad on left with blanks */
f->writechar(' ', padding, f, &charsout);
}
/* write prefix */
writestring(prefix, prefixlen, f, &charsout, 0);
if ((flags & FL_LEADZERO) && !(flags & FL_LEFT)) {
/* write leading zeros */
f->writechar('0', padding, f, &charsout);
}
/* write text */
writestring(text, textlen, f, &charsout, flags & FL_WIDE);
if (flags & FL_LEFT) {
/* pad on right with blanks */
f->writechar(' ', padding, f, &charsout);
}
/* we're done! */
}
break;
}
}
return charsout; /* return value = number of characters written */
}
/***
*int get_int_arg(va_list pargptr)
*
*Purpose:
* Gets an int argument off the given argument list and updates *pargptr.
*
*Entry:
* va_list pargptr - pointer to argument list; updated by function
*
*Exit:
* Returns the integer argument read from the argument list.
*
*Exceptions:
*
*******************************************************************************/
LOCAL(int) get_int_arg(va_list FAR *pargptr)
{
return va_arg(*pargptr, int);
}
/***
*long get_long_arg(va_list pargptr)
*
*Purpose:
* Gets an long argument off the given argument list and updates pargptr.
*
*Entry:
* va_list pargptr - pointer to argument list; updated by function
*
*Exit:
* Returns the long argument read from the argument list.
*
*Exceptions:
*
*******************************************************************************/
#if !LONG_IS_INT
LOCAL(long) get_long_arg(va_list FAR *pargptr)
{
return va_arg(*pargptr, long);
}
#endif
/***
*void writestring(char *string, int len, struct w4io *f, int *pcchwritten, int fwide)
*
*Purpose:
* Writes a string of the given length to the given file. If no error occurs,
* then *pcchwritten is incremented by len; otherwise, *pcchwritten is set
* to -1. If len is negative, it is treated as zero.
*
*Entry:
* char *string - string to write (NOT null-terminated)
* int len - length of string
* struct w4io *f - file to write to
* int *pcchwritten - pointer to integer to update with total chars written
* int fwide - wide character flag
*
*Exit:
* No return value.
*
*Exceptions:
*
*******************************************************************************/
LOCAL(void) writestring(
char FAR *string,
int len,
struct w4io FAR *f,
int FAR *pcchwritten,
int fwide)
{
wchar_t FAR *pwc;
//printf("string: str=%.*s, len=%d, cch=%d, f=%d\n", len, string, len, *pcchwritten, fwide);
if (fwide) {
pwc = (wchar_t FAR *) string;
while (len-- > 0) {
if (*pwc & 0xff00) {
f->writechar('^', 1, f, pcchwritten);
}
f->writechar((char) *pwc++, 1, f, pcchwritten);
}
} else {
while (len-- > 0) {
f->writechar(*string++, 1, f, pcchwritten);
}
}
}
#endif // DBG == 1