path: root/libc/stdio/old_vfprintf.c

/*
 * This file based on printf.c from 'Dlibs' on the atari ST  (RdeBath)
 *
 * 
 *    Dale Schumacher                         399 Beacon Ave.
 *    (alias: Dalnefre')                      St. Paul, MN  55104
 *    dal@syntel.UUCP                         United States of America
 *  "It's not reality that's important, but how you perceive things."
 */

/* Altered to use stdarg, made the core function vfnprintf.
 * Hooked into the stdio package using 'inside information'
 * Altered sizeof() assumptions, now assumes all integers except chars
 * will be either
 *  sizeof(xxx) == sizeof(long) or sizeof(xxx) == sizeof(short)
 *
 * -RDB
 */

/*
 *                    Manuel Novoa III   Dec 2000
 *
 * The previous vfnprintf routine was almost completely rewritten with the
 * goal of fixing some shortcomings and reducing object size.
 *
 * The summary of changes:
 *
 * Converted print conversion specification parsing from one big switch
 *   to a method using string tables.  This new method verifies that the
 *   conversion flags, field width, precision, qualifier, and specifier
 *   appear in the correct order.  Many questionable specifications were
 *   accepted by the previous code.  This new method also resulted in a
 *   substantial reduction in object size of about 330 bytes (20%) from
 *   the old version (1627 bytes) on i386, even with the following
 *   improvements.
 *
 *     Implemented %n specifier as required by the standards.
 *     Implemented proper handling of precision for int types.
 *     Implemented # for hex and pointer, fixed error for octal rep of 0.
 *     Implemented return of -1 on stream error.
 *
 * Added optional support for the GNU extension %m which prints the string
 *   corresponding the errno.
 *
 * Added optional support for long long ints and unsigned long long ints
 *   using the conversion qualifiers "ll", "L", or "q" (like glibc).
 *
 * Added optional support for doubles in a very limited form.  None of
 *   the formating options are obeyed.  The string returned by __dtostr
 *   is printed directly.
 *
 * Converted to use my (un)signed long (long) to string routines, which are
 * smaller than the previous functions and don't require static buffers.
 *
 * Other Modifications:
 *   Modified sprintf, snprintf, vsprintf, vsnprintf to share on fake-file.
 */

/*
 *                    Manuel Novoa III   Jan 2001
 *
 * Removed fake file from *s*printf functions because of possible problems
 *    if called recursively.  Instead, have sprintf, snprintf, and vsprintf
 *    call vsnprintf which allocates a fake file on the stack.
 * Removed WANT_FPUTC option.  Always use standard putc macro to avoid
 *    problems with the fake file used by the *s*printf functions.
 * Fixed bug parsing flags -- did not restart scan.
 * Added function asprintf.
 * Fixed 0-pad prefixing bug.
 * Converted sizeof(int) == sizeof(long) tests to compile time vs run time.
 *    This saves 112 bytes of code on i386.
 * Fixed precision bug -- when negative set to default.
 * Added function fnprintf to support __dtostr.
 * Added floating point support for doubles.  Yeah!
 * 
 *
 * May 2001     Fixes from Johan Adolfsson (johan.adolfsson@axis.com)
 *    1) printf("%c",0) returned 0 instead of 1.
 *    2) unrolled loop in asprintf to reduce size and remove compile warning.
 *
 *
 * June 2001
 *    1) fix %p so that "0x" is prepended to outputed hex val
 *    2) fix %p so that "(nil)" is output for (void *)0 to match glibc
 *
 */

/*****************************************************************************/
/*                            OPTIONS                                        */
/*****************************************************************************/
/* The optional support for long longs and doubles comes in two forms.
 *
 *   1) Normal (or partial for doubles) output support.  Set to 1 to turn on.
 *      Adds about 130 bytes for doubles, about 220 bytes for long longs,
 *      and about 275 for both to the base code size of 1163 on i386.
 */

/* These are now set in uClibc_config.h based on Config. */
/*
#define __UCLIBC_HAS_FLOATS__            1
*/

/*   2) An error message is inserted into the stream, an arg of the
 *      appropriate size is removed from the arglist, and processing
 *      continues.  This is adds less code and may be useful in some
 *      cases.  Set to 1 to turn on.  Adds about 50 bytes for doubles,
 *      about 140 bytes for long longs, and about 175 bytes for both
 *      to the base code size of 1163 on i386.
 */

#define WANT_FLOAT_ERROR      0

/*
 * Set to support GNU extension of %m to print string corresponding to errno.
 *
 * Warning: This adds about 50 bytes (i386) to the code but it also pulls in
 * strerror and the corresponding string table which together are about 3.8k.
 */

#define WANT_GNU_ERRNO         0

/**************************************************************************/

#define _GNU_SOURCE				/* for strnlen */
#define _STDIO_UTILITY
#include <stdio.h>
#include <stdarg.h>
#include <limits.h>
#include <string.h>
#include <errno.h>

#define __PRINTF_INFO_NO_BITFIELD
#include <printf.h>

#ifdef __STDIO_THREADSAFE
#include <pthread.h>
#endif /* __STDIO_THREADSAFE */

/*  #undef __UCLIBC_HAS_FLOATS__ */
/*  #undef WANT_FLOAT_ERROR */
/*  #define WANT_FLOAT_ERROR      1 */

#define __isdigit(c) (((unsigned int)(c - '0')) < 10)

extern size_t _dtostr(FILE * fp, long double x, struct printf_info *info);


enum {
	FLAG_PLUS = 0,
	FLAG_MINUS_LJUSTIFY,
	FLAG_HASH,
	FLAG_0_PAD,
	FLAG_SPACE,
};

/* layout                   01234  */
static const char spec[] = "+-#0 ";

static const char qual[] = "hlLq";

#if !defined(__UCLIBC_HAS_FLOATS__) && WANT_FLOAT_ERROR
static const char dbl_err[] = "<DOUBLE>";
#endif

#if defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR
/* layout                     012345678901234567   */
static const char u_spec[] = "%nbopxXudicsfgGeEaA";
#else
/* layout                     0123456789012   */
static const char u_spec[] = "%nbopxXudics";
#endif

/* WARNING: u_spec and u_radix need to stay in agreement!!! */
/* u_radix[i] <-> u_spec[i+2] for unsigned entries only */
static const char u_radix[] = "\x02\x08\x10\x10\x10\x0a";

int vfprintf(FILE * __restrict op, register const char * __restrict fmt,
			 va_list ap)
{
	int i, cnt, lval, len;
	char *p;
	const char *fmt0;
	int preci, width;
#define upcase i
	int radix, dpoint /*, upcase*/;
	char tmp[65];				/* TODO - determing needed size from headers */
	char flag[sizeof(spec)];

	__STDIO_THREADLOCK(op);

	cnt = 0;

	while (*fmt) {
		if (*fmt == '%') {
			fmt0 = fmt;			/* save our position in case of bad format */
			++fmt;
			width = -1;			/* min field width */
			preci = -5;			/* max string width or mininum digits */
			radix = 10;			/* number base */
			dpoint = 0;			/* found decimal point */
#if INT_MAX != LONG_MAX
			lval = 0;			/* sizeof(int) != sizeof(long) */
#else
			lval = 1;			/* sizeof(int) == sizeof(long) */
#endif

			/* init flags */
			for (p =(char *) spec ; *p ; p++) {
				flag[p-spec] = '\0';
			}
			flag[FLAG_0_PAD] = ' ';

			/* process optional flags */
			for (p = (char *)spec ; *p ; ) {
				if (*fmt == *p) {
					flag[p-spec] = *fmt++;
					p = (char *)spec; /* restart scan */
				} else {
					p++;
				}
			}
			
			if (!flag[FLAG_PLUS]) {
				flag[FLAG_PLUS] = flag[FLAG_SPACE];
			}

			/* process optional width and precision */
			do {
				if (*fmt == '.') {
					++fmt;
					dpoint = 1;
				}
				if (*fmt == '*') {	/* parameter width value */
					++fmt;
					i = va_arg(ap, int);
				} else {
					for ( i = 0 ; (*fmt >= '0') && (*fmt <= '9') ; ++fmt ) {
						i = (i * 10) + (*fmt - '0');
					}
				}

				if (dpoint) {
					preci = i;
					if (i<0) {
						preci = -5;
					}
				} else {
					width = i;
					if (i<0) {
						width = -i;
						flag[FLAG_MINUS_LJUSTIFY] = 1;
					}
				}
			} while ((*fmt == '.') && !dpoint );

			/* process optional qualifier */
			for (p = (char *) qual ; *p ; p++) {
				if (*p == *fmt) {
					lval = p - qual;
					++fmt;		/* TODO - hh */
					if ((*p == 'l') && (*fmt == *p)) {
						++lval;
						++fmt;
					}
				}
			}

#if WANT_GNU_ERRNO
			if (*fmt == 'm') {
				flag[FLAG_PLUS] = '\0';
				flag[FLAG_0_PAD] = ' ';
				p = strerror(errno);
				goto print;
			}
#endif

			/* process format specifier */
			for (p = (char *) u_spec ; *p ; p++) {
				if (*fmt != *p) continue;
				if (p-u_spec < 1) {	/* print a % */
					goto charout;
				}
				if (p-u_spec < 2) {	/* store output count in int ptr */
					*(va_arg(ap, int *)) = cnt;
					goto nextfmt;
				}
				if (p-u_spec < 8) { /* unsigned conversion */
					radix = u_radix[p-u_spec-2];
					upcase = ((*p == 'x') ? __UIM_LOWER : __UIM_UPPER);
					if (*p == 'p') {
						lval = (sizeof(char *) == sizeof(long));
						upcase = __UIM_LOWER;
						flag[FLAG_HASH] = 'p';
					}

					p = _uintmaxtostr((tmp + sizeof(tmp) - 1),
									  ((lval>1) /* TODO -- longlong/long/int/short/char */
									   ? va_arg(ap, uintmax_t)
									   : (uintmax_t)
									   va_arg(ap, unsigned long)),
									  radix, upcase);

					flag[FLAG_PLUS] = '\0';	/* meaningless for unsigned */
					if (*p != '0') { /* non-zero */
						if (flag[FLAG_HASH]) {
							if (radix == 8) {
								*--p = '0';	/* add leadding zero */
							} else if (radix != 10) { /* either 2 or 16 */
								flag[FLAG_PLUS] = '0';
								*--p = 'b';
								if (radix == 16) {
									*p = 'x';
									if (*fmt == 'X') {
										*p = 'X';
									}
								}
							}
						}
					} else if (flag[FLAG_HASH] == 'p') { /* null pointer */
						p = "(nil)";
					}
				} else if (p-u_spec < 10) { /* signed conversion */

 					p = _uintmaxtostr((tmp + sizeof(tmp) - 1),
									  ((lval>1) /* TODO -- longlong/long/int/short/char */
									   ? va_arg(ap, uintmax_t)
									   : (uintmax_t) ((long long) /* sign-extend! */
													va_arg(ap, long))),
									  -radix, upcase);

				} else if (p-u_spec < 12) {	/* character or string */
					flag[FLAG_PLUS] = '\0';
					flag[FLAG_0_PAD] = ' ';
					if (*p == 'c') {	/* character */
						p = tmp;
						*p = va_arg(ap, int);
						/* This takes care of the "%c",0 case */
						len = 1;
						goto print_len_set;
					} else {	/* string */
						p = va_arg(ap, char *);
						if (!p) {
							p = "(null)";
							preci = 6;
						} else {
							if (preci < 0) {
								preci = INT_MAX;
							}
						}
						len = strnlen(p, preci);
						goto print_len_set;
					}
#if defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR
				} else if (p-u_spec < 27) {		/* floating point */
#endif /* defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR */
#if defined(__UCLIBC_HAS_FLOATS__)
					struct printf_info info;
					if (preci < 0) {
						preci = 6;
					}
					info.width = width;
					info.prec = preci;
					info.spec = *fmt;
					info.pad = flag[FLAG_0_PAD];
					info._flags = 0;
					if (flag[FLAG_PLUS] == '+') {
						PRINT_INFO_SET_FLAG(&info,showsign);
					} else if (flag[FLAG_PLUS] == ' ') {
						PRINT_INFO_SET_FLAG(&info,space);
					}
					if (flag[FLAG_HASH]) {
						PRINT_INFO_SET_FLAG(&info,alt);
					}
					if (flag[FLAG_MINUS_LJUSTIFY]) {
						PRINT_INFO_SET_FLAG(&info,left);
					}
					cnt += _dtostr(op, 
								   ((lval > 1)
									? va_arg(ap, long double)
									: (long double) va_arg(ap, double)),
								   &info);
					goto nextfmt;
#elif WANT_FLOAT_ERROR
					(void) ((lval > 1) ? va_arg(ap, long double)
							: va_arg(ap, double)); /* carry on */
					p = (char *) dbl_err;
#endif /* defined(__UCLIBC_HAS_FLOATS__) */
				}

#if WANT_GNU_ERRNO
			print:
#endif
				{				/* this used to be printfield */
					/* cheaper than strlen call */
/*  					for ( len = 0 ; p[len] ; len++ ) { } */
					len = strnlen(p, SIZE_MAX);
				print_len_set:
					if ((*p == '-')
#if WANT_GNU_ERRNO
						&& (*fmt != 'm')
#endif
						&& (*fmt != 's')) {
						flag[FLAG_PLUS] = *p++;
						--len;
					}
				    if (flag[FLAG_PLUS]) {
						++len;
						++preci;
						if (flag[FLAG_PLUS] == '0') { /* base 16 */
							++preci; /* account for x or X */
						}
					}

					if (preci >= 0) {
						if ((*fmt == 's')
#if WANT_GNU_ERRNO
						|| (*fmt == 'm')
#endif
						) {
							if (len > preci) {
								len = preci;
							} else {
								preci = len;
							}
						}
						preci -= len;
						if (preci < 0) {
							preci = 0;
						}
						width -= preci;
					}

					width -= len;
					if (width < 0) {
						width = 0;
					}

					if (preci < 0) {
						preci = 0;
						if (!flag[FLAG_MINUS_LJUSTIFY]
							/* && flag[FLAG_PLUS] */
							&& (flag[FLAG_0_PAD] == '0')) { 
							preci = width;
							width = 0;
						}
					}

					while (width + len + preci) {
						unsigned char ch;
						/* right padding || left padding */
						if ((!len && !preci)
							|| (width && !flag[FLAG_MINUS_LJUSTIFY])) {
							ch = ' ';
							--width;
						} else if (flag[FLAG_PLUS]) {
							ch = flag[FLAG_PLUS]; /* sign */
							if (flag[FLAG_PLUS]=='0') {	/* base 16 case */
								flag[FLAG_PLUS] = *p++;	/* get the x|X */
							} else {
								flag[FLAG_PLUS] = '\0';
							}
							--len;
						} else if (preci) {
							ch = '0';
							--preci;
						} else {
							ch = *p++; /* main field */
							--len;
						}
						++cnt;
						putc(ch, op);
					}
				}
				goto nextfmt;
			}

			fmt = fmt0;	/* this was an illegal format */
		}

	charout:
		++cnt;
		putc(*fmt, op);	/* normal char out */

	nextfmt:
		++fmt;
	}

	i = (__FERROR(op)) ? -1 : cnt;

	__STDIO_THREADLOCK(op);

	return i;
}