path: root/backends/platform/symbian/src/vsnprintf.h

/*
 * This is the vsnprintf for scummvm/symbian implementation from the original
 * snprintf.c, all support functions has been removed and vsnprintf renamed to
 * symbian_vsnprintf
 * According to the homepage this function may be licensed under either the
 * Frontier Artistic License or the GPL.
 *
 * snprintf.c - a portable implementation of snprintf
 *
 * AUTHOR
 *   Mark Martinec <mark.martinec@ijs.si>, April 1999.
 *
 *   Copyright 1999, Mark Martinec. All rights reserved.
 *
 * TERMS AND CONDITIONS
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the "Frontier Artistic License" which comes
 *   with this Kit.
 *
 *   This program 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 Frontier Artistic License for more details.
 *
 *   You should have received a copy of the Frontier Artistic License
 *   with this Kit in the file named LICENSE.txt .
 *   If not, I'll be glad to provide one.
 *
 * FEATURES
 * - careful adherence to specs regarding flags, field width and precision;
 * - good performance for large string handling (large format, large
 *   argument or large paddings). Performance is similar to system's sprintf
 *   and in several cases significantly better (make sure you compile with
 *   optimizations turned on, tell the compiler the code is strict ANSI
 *   if necessary to give it more freedom for optimizations);
 * - return value semantics per ISO/IEC 9899:1999 ("ISO C99");
 * - written in standard ISO/ANSI C - requires an ANSI C compiler.
 *
 * SUPPORTED CONVERSION SPECIFIERS AND DATA TYPES
 *
 * This snprintf only supports the following conversion specifiers:
 * s, c, d, u, o, x, X, p  (and synonyms: i, D, U, O - see below)
 * with flags: '-', '+', ' ', '0' and '#'.
 * An asterisk is supported for field width as well as precision.
 *
 * Length modifiers 'h' (short int), 'l' (long int),
 * and 'll' (long long int) are supported.
 * NOTE:
 *   If macro SNPRINTF_LONGLONG_SUPPORT is not defined (default) the
 *   length modifier 'll' is recognized but treated the same as 'l',
 *   which may cause argument value truncation! Defining
 *   SNPRINTF_LONGLONG_SUPPORT requires that your system's sprintf also
 *   handles length modifier 'll'.  long long int is a language extension
 *   which may not be portable.
 *
 * Conversion of numeric data (conversion specifiers d, u, o, x, X, p)
 * with length modifiers (none or h, l, ll) is left to the system routine
 * sprintf, but all handling of flags, field width and precision as well as
 * c and s conversions is done very carefully by this portable routine.
 * If a string precision (truncation) is specified (e.g. %.8s) it is
 * guaranteed the string beyond the specified precision will not be referenced.
 *
 * Length modifiers h, l and ll are ignored for c and s conversions (data
 * types wint_t and wchar_t are not supported).
 *
 * The following common synonyms for conversion characters are supported:
 *   - i is a synonym for d
 *   - D is a synonym for ld, explicit length modifiers are ignored
 *   - U is a synonym for lu, explicit length modifiers are ignored
 *   - O is a synonym for lo, explicit length modifiers are ignored
 * The D, O and U conversion characters are nonstandard, they are supported
 * for backward compatibility only, and should not be used for new code.
 *
 * The following is specifically NOT supported:
 *   - flag ' (thousands' grouping character) is recognized but ignored
 *   - numeric conversion specifiers: f, e, E, g, G and synonym F,
 *     as well as the new a and A conversion specifiers
 *   - length modifier 'L' (long double) and 'q' (quad - use 'll' instead)
 *   - wide character/string conversions: lc, ls, and nonstandard
 *     synonyms C and S
 *   - writeback of converted string length: conversion character n
 *   - the n$ specification for direct reference to n-th argument
 *   - locales
 *
 * It is permitted for str_m to be zero, and it is permitted to specify NULL
 * pointer for resulting string argument if str_m is zero (as per ISO C99).
 *
 * The return value is the number of characters which would be generated
 * for the given input, excluding the trailing null. If this value
 * is greater or equal to str_m, not all characters from the result
 * have been stored in str, output bytes beyond the (str_m-1) -th character
 * are discarded. If str_m is greater than zero it is guaranteed
 * the resulting string will be null-terminated.
 *
 * NOTE that this matches the ISO C99, OpenBSD, and GNU C library 2.1,
 * but is different from some older and vendor implementations,
 * and is also different from XPG, XSH5, SUSv2 specifications.
 * For historical discussion on changes in the semantics and standards
 * of snprintf see printf(3) man page in the Linux programmers manual.
 *
 * Routines asprintf and vasprintf return a pointer (in the ptr argument)
 * to a buffer sufficiently large to hold the resulting string. This pointer
 * should be passed to free(3) to release the allocated storage when it is
 * no longer needed. If sufficient space cannot be allocated, these functions
 * will return -1 and set ptr to be a NULL pointer. These two routines are a
 * GNU C library extensions (glibc).
 *
 * Routines asnprintf and vasnprintf are similar to asprintf and vasprintf,
 * yet, like snprintf and vsnprintf counterparts, will write at most str_m-1
 * characters into the allocated output string, the last character in the
 * allocated buffer then gets the terminating null. If the formatted string
 * length (the return value) is greater than or equal to the str_m argument,
 * the resulting string was truncated and some of the formatted characters
 * were discarded. These routines present a handy way to limit the amount
 * of allocated memory to some sane value.
 *
 * AVAILABILITY
 *   http://www.ijs.si/software/snprintf/
 *
 * REVISION HISTORY
 * 1999-04	V0.9  Mark Martinec
 *		- initial version, some modifications after comparing printf
 *		  man pages for Digital Unix 4.0, Solaris 2.6 and HPUX 10,
 *		  and checking how Perl handles sprintf (differently!);
 * 1999-04-09	V1.0  Mark Martinec <mark.martinec@ijs.si>
 *		- added main test program, fixed remaining inconsistencies,
 *		  added optional (long long int) support;
 * 1999-04-12	V1.1  Mark Martinec <mark.martinec@ijs.si>
 *		- support the 'p' conversion (pointer to void);
 *		- if a string precision is specified
 *		  make sure the string beyond the specified precision
 *		  will not be referenced (e.g. by strlen);
 * 1999-04-13	V1.2  Mark Martinec <mark.martinec@ijs.si>
 *		- support synonyms %D=%ld, %U=%lu, %O=%lo;
 *		- speed up the case of long format string with few conversions;
 * 1999-06-30	V1.3  Mark Martinec <mark.martinec@ijs.si>
 *		- fixed runaway loop (eventually crashing when str_l wraps
 *		  beyond 2^31) while copying format string without
 *		  conversion specifiers to a buffer that is too short
 *		  (thanks to Edwin Young <edwiny@autonomy.com> for
 *		  spotting the problem);
 *		- added macros PORTABLE_SNPRINTF_VERSION_(MAJOR|MINOR)
 *		  to snprintf.h
 * 2000-02-14	V2.0 (never released) Mark Martinec <mark.martinec@ijs.si>
 *		- relaxed license terms: The Artistic License now applies.
 *		  You may still apply the GNU GENERAL PUBLIC LICENSE
 *		  as was distributed with previous versions, if you prefer;
 *		- changed REVISION HISTORY dates to use ISO 8601 date format;
 *		- added vsnprintf (patch also independently proposed by
 *		  Caolan McNamara 2000-05-04, and Keith M Willenson 2000-06-01)
 * 2000-06-27	V2.1  Mark Martinec <mark.martinec@ijs.si>
 *		- removed POSIX check for str_m<1; value 0 for str_m is
 *		  allowed by ISO C99 (and GNU C library 2.1) - (pointed out
 *		  on 2000-05-04 by Caolan McNamara, caolan@ csn dot ul dot ie).
 *		  Besides relaxed license this change in standards adherence
 *		  is the main reason to bump up the major version number;
 *		- added nonstandard routines asnprintf, vasnprintf, asprintf,
 *		  vasprintf that dynamically allocate storage for the
 *		  resulting string; these routines are not compiled by default,
 *		  see comments where NEED_V?ASN?PRINTF macros are defined;
 *		- autoconf contributed by Caolan McNamara
 * 2000-10-06	V2.2  Mark Martinec <mark.martinec@ijs.si>
 *		- BUG FIX: the %c conversion used a temporary variable
 *		  that was no longer in scope when referenced,
 *		  possibly causing incorrect resulting character;
 *		- BUG FIX: make precision and minimal field width unsigned
 *		  to handle huge values (2^31 <= n < 2^32) correctly;
 *		  also be more careful in the use of signed/unsigned/size_t
 *		  internal variables - probably more careful than many
 *		  vendor implementations, but there may still be a case
 *		  where huge values of str_m, precision or minimal field
 *		  could cause incorrect behaviour;
 *		- use separate variables for signed/unsigned arguments,
 *		  and for short/int, long, and long long argument lengths
 *		  to avoid possible incompatibilities on certain
 *		  computer architectures. Also use separate variable
 *		  arg_sign to hold sign of a numeric argument,
 *		  to make code more transparent;
 *		- some fiddling with zero padding and "0x" to make it
 *		  Linux compatible;
 *		- systematically use macros fast_memcpy and fast_memset
 *		  instead of case-by-case hand optimization; determine some
 *		  breakeven string lengths for different architectures;
 *		- terminology change: 'format' -> 'conversion specifier',
 *		  'C9x' -> 'ISO/IEC 9899:1999 ("ISO C99")',
 *		  'alternative form' -> 'alternate form',
 *		  'data type modifier' -> 'length modifier';
 *		- several comments rephrased and new ones added;
 *		- make compiler not complain about 'credits' defined but
 *		  not used;
 */
/* ============================================= */
/* NO USER SERVICABLE PARTS FOLLOWING THIS POINT */
/* ============================================= */

#define PORTABLE_SNPRINTF_VERSION_MAJOR 2
#define PORTABLE_SNPRINTF_VERSION_MINOR 2
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <errno.h>
#ifdef isdigit
#undef isdigit
#endif
#define isdigit(c) ((c) >= '0' && (c) <= '9')

#ifndef breakeven_point
#  define breakeven_point   6	/* some reasonable one-size-fits-all value */
#endif

#define fast_memcpy(d,s,n) \
{ register size_t nn = (size_t)(n); \
    if (nn >= breakeven_point) memcpy((d), (s), nn); \
    else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
	register char *dd; register const char *ss; \
for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }

#define fast_memset(d,c,n) \
{ register size_t nn = (size_t)(n); \
    if (nn >= breakeven_point) memset((d), (int)(c), nn); \
    else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
	register char *dd; register const int cc=(int)(c); \
for (dd=(d); nn>0; nn--) *dd++ = cc; } }


/* declarations */

static char credits[] = "\n\
@(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
@(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
@(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
int symbian_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {

	size_t str_l = 0;
	const char *p = fmt;

	/* In contrast with POSIX, the ISO C99 now says
	* that str can be NULL and str_m can be 0.
	* This is more useful than the old:  if (str_m < 1) return -1; */

	if (!p) p = "";
	while (*p) {
		if (*p != '%') {
			/* if (str_l < str_m) str[str_l++] = *p++;    -- this would be sufficient */
			/* but the following code achieves better performance for cases
			* where format string is long and contains few conversions */
			const char *q = strchr(p + 1, '%');
			size_t n = !q ? strlen(p) : (q - p);
			if (str_l < str_m) {
				size_t avail = str_m - str_l;
				fast_memcpy(str + str_l, p, (n > avail ? avail : n));
			}
			p += n;
			str_l += n;
		} else {
			const char *starting_p;
			size_t min_field_width = 0, precision = 0;
			int zero_padding = 0, precision_specified = 0, justify_left = 0;
			int alternate_form = 0, force_sign = 0;
			int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
			the ' ' flag should be ignored. */
			char length_modifier = '\0';            /* allowed values: \0, h, l, L */
			char tmp[32];/* temporary buffer for simple numeric->string conversion */

			const char *str_arg;      /* string address in case of string argument */
			size_t str_arg_l;         /* natural field width of arg without padding
									  and sign */
			unsigned char uchar_arg;
			/* unsigned char argument value - only defined for c conversion.
			N.B. standard explicitly states the char argument for
			the c conversion is unsigned */

			size_t number_of_zeros_to_pad = 0;
			/* number of zeros to be inserted for numeric conversions
			as required by the precision or minimal field width */

			size_t zero_padding_insertion_ind = 0;
			/* index into tmp where zero padding is to be inserted */

			char fmt_spec = '\0';
			/* current conversion specifier character */

			str_arg = credits;/* just to make compiler happy (defined but not used)*/
			str_arg = NULL;
			starting_p = p;
			p++;  /* skip '%' */
			/* parse flags */
			while (*p == '0' || *p == '-' || *p == '+' ||
			       *p == ' ' || *p == '#' || *p == '\'') {
				switch (*p) {
				case '0':
					zero_padding = 1;
					break;
				case '-':
					justify_left = 1;
					break;
				case '+':
					force_sign = 1;
					space_for_positive = 0;
					break;
				case ' ':
					force_sign = 1;
					/* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
					break;
				case '#':
					alternate_form = 1;
					break;
				case '\'':
					break;
				}
				p++;
			}
			/* If the '0' and '-' flags both appear, the '0' flag should be ignored. */

			/* parse field width */
			if (*p == '*') {
				int j;
				p++;
				j = va_arg(ap, int);
				if (j >= 0) min_field_width = j;
				else { min_field_width = -j; justify_left = 1; }
			} else if (isdigit((int)(*p))) {
				/* size_t could be wider than unsigned int;
				    make sure we treat argument like common implementations do */
				unsigned int uj = *p++ - '0';
				while (isdigit((int)(*p))) uj = 10 * uj + (unsigned int)(*p++ - '0');
				min_field_width = uj;
			}
			/* parse precision */
			if (*p == '.') {
				p++;
				precision_specified = 1;
				if (*p == '*') {
					int j = va_arg(ap, int);
					p++;
					if (j >= 0) precision = j;
					else {
						precision_specified = 0;
						precision = 0;
						/* NOTE:
						*   Solaris 2.6 man page claims that in this case the precision
						*   should be set to 0.  Digital Unix 4.0, HPUX 10 and BSD man page
						*   claim that this case should be treated as unspecified precision,
						*   which is what we do here.
						*/
					}
				} else if (isdigit((int)(*p))) {
					/* size_t could be wider than unsigned int;
					    make sure we treat argument like common implementations do */
					unsigned int uj = *p++ - '0';
					while (isdigit((int)(*p))) uj = 10 * uj + (unsigned int)(*p++ - '0');
					precision = uj;
				}
			}
			/* parse 'h', 'l' and 'll' length modifiers */
			if (*p == 'h' || *p == 'l') {
				length_modifier = *p;
				p++;
				if (length_modifier == 'l' && *p == 'l') {   /* double l = long long */
#ifdef SNPRINTF_LONGLONG_SUPPORT
					length_modifier = '2';                  /* double l encoded as '2' */
#else
					length_modifier = 'l';                 /* treat it as a single 'l' */
#endif
					p++;
				}
			}
			fmt_spec = *p;
			/* common synonyms: */
			switch (fmt_spec) {
			case 'i':
				fmt_spec = 'd';
				break;
			case 'D':
				fmt_spec = 'd';
				length_modifier = 'l';
				break;
			case 'U':
				fmt_spec = 'u';
				length_modifier = 'l';
				break;
			case 'O':
				fmt_spec = 'o';
				length_modifier = 'l';
				break;
			default:
				break;
			}
			/* get parameter value, do initial processing */
			switch (fmt_spec) {
			case '%': /* % behaves similar to 's' regarding flags and field widths */
			case 'c': /* c behaves similar to 's' regarding flags and field widths */
			case 's':
				length_modifier = '\0';          /* wint_t and wchar_t not supported */
				/* the result of zero padding flag with non-numeric conversion specifier*/
				/* is undefined. Solaris and HPUX 10 does zero padding in this case,    */
				/* Digital Unix and Linux does not. */
				zero_padding = 0;    /* turn zero padding off for string conversions */
				str_arg_l = 1;
				switch (fmt_spec) {
				case '%':
					str_arg = p;
					break;
				case 'c': {
					int j = va_arg(ap, int);
					uchar_arg = (unsigned char) j;   /* standard demands unsigned char */
					str_arg = (const char *) & uchar_arg;
					break;
				}
				case 's':
					str_arg = va_arg(ap, const char *);
					if (!str_arg) str_arg_l = 0;
					/* make sure not to address string beyond the specified precision !!! */
					else if (!precision_specified) str_arg_l = strlen(str_arg);
					/* truncate string if necessary as requested by precision */
					else if (precision == 0) str_arg_l = 0;
					else {
						/* memchr on HP does not like n > 2^31  !!! */
						const char *q = (const char*) memchr(str_arg, '\0',
						                                     precision <= 0x7fffffff ? precision : 0x7fffffff);
						str_arg_l = !q ? precision : (q - str_arg);
					}
					break;
				default:
					break;
				}
				break;
			case 'd':
			case 'u':
			case 'o':
			case 'x':
			case 'X':
			case 'p': {
				/* NOTE: the u, o, x, X and p conversion specifiers imply
				    the value is unsigned;  d implies a signed value */

				int arg_sign = 0;
				/* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
				+1 if greater than zero (or nonzero for unsigned arguments),
				-1 if negative (unsigned argument is never negative) */

				int int_arg = 0;
				unsigned int uint_arg = 0;
				/* only defined for length modifier h, or for no length modifiers */

				long int long_arg = 0;
				unsigned long int ulong_arg = 0;
				/* only defined for length modifier l */

				void *ptr_arg = NULL;
				/* pointer argument value -only defined for p conversion */

#ifdef SNPRINTF_LONGLONG_SUPPORT
				long long int long_long_arg = 0;
				unsigned long long int ulong_long_arg = 0;
				/* only defined for length modifier ll */
#endif
				if (fmt_spec == 'p') {
					/* HPUX 10: An l, h, ll or L before any other conversion character
					*   (other than d, i, u, o, x, or X) is ignored.
					* Digital Unix:
					*   not specified, but seems to behave as HPUX does.
					* Solaris: If an h, l, or L appears before any other conversion
					*   specifier (other than d, i, u, o, x, or X), the behavior
					*   is undefined. (Actually %hp converts only 16-bits of address
					*   and %llp treats address as 64-bit data which is incompatible
					*   with (void *) argument on a 32-bit system).
					    */
					length_modifier = '\0';
					ptr_arg = va_arg(ap, void *);
					if (ptr_arg != NULL) arg_sign = 1;
				} else if (fmt_spec == 'd') {  /* signed */
					switch (length_modifier) {
					case '\0':
					case 'h':
						/* It is non-portable to specify a second argument of char or short
						* to va_arg, because arguments seen by the called function
						* are not char or short.  C converts char and short arguments
						* to int before passing them to a function.
						    */
						int_arg = va_arg(ap, int);
						if (int_arg > 0) arg_sign =  1;
						else if (int_arg < 0) arg_sign = -1;
						break;
					case 'l':
						long_arg = va_arg(ap, long int);
						if (long_arg > 0) arg_sign =  1;
						else if (long_arg < 0) arg_sign = -1;
						break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
					case '2':
						long_long_arg = va_arg(ap, long long int);
						if (long_long_arg > 0) arg_sign =  1;
						else if (long_long_arg < 0) arg_sign = -1;
						break;
#endif
					}
				} else {  /* unsigned */
					switch (length_modifier) {
					case '\0':
					case 'h':
						uint_arg = va_arg(ap, unsigned int);
						if (uint_arg) arg_sign = 1;
						break;
					case 'l':
						ulong_arg = va_arg(ap, unsigned long int);
						if (ulong_arg) arg_sign = 1;
						break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
					case '2':
						ulong_long_arg = va_arg(ap, unsigned long long int);
						if (ulong_long_arg) arg_sign = 1;
						break;
#endif
					}
				}
				str_arg = tmp;
				str_arg_l = 0;
				/* NOTE:
				*   For d, i, u, o, x, and X conversions, if precision is specified,
				*   the '0' flag should be ignored. This is so with Solaris 2.6,
				*   Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
				*/
				if (precision_specified) zero_padding = 0;
				if (fmt_spec == 'd') {
					if (force_sign && arg_sign >= 0)
						tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
					/* leave negative numbers for sprintf to handle,
					to avoid handling tricky cases like (short int)(-32768) */
				} else if (alternate_form) {
					if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X'))
						{ tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; }
					/* alternate form should have no effect for p conversion, but ... */
				}
				zero_padding_insertion_ind = str_arg_l;
				if (!precision_specified) precision = 1;   /* default precision is 1 */
				if (precision == 0 && arg_sign == 0
				   ) {
					/* converted to null string */
					/* When zero value is formatted with an explicit precision 0,
					the resulting formatted string is empty (d, i, u, o, x, X, p).   */
				} else {
					char f[5];
					int f_l = 0;
					f[f_l++] = '%';    /* construct a simple format string for sprintf */
					if (!length_modifier) { } else if (length_modifier == '2') { f[f_l++] = 'l'; f[f_l++] = 'l'; } else f[f_l++] = length_modifier;
					f[f_l++] = fmt_spec;
					f[f_l++] = '\0';
					if (fmt_spec == 'p') str_arg_l += sprintf(tmp + str_arg_l, f, ptr_arg);
					else if (fmt_spec == 'd') {  /* signed */
						switch (length_modifier) {
						case '\0':
						case 'h':
							str_arg_l += sprintf(tmp + str_arg_l, f, int_arg);
							break;
						case 'l':
							str_arg_l += sprintf(tmp + str_arg_l, f, long_arg);
							break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
						case '2':
							str_arg_l += sprintf(tmp + str_arg_l, f, long_long_arg);
							break;
#endif
						}
					} else {  /* unsigned */
						switch (length_modifier) {
						case '\0':
						case 'h':
							str_arg_l += sprintf(tmp + str_arg_l, f, uint_arg);
							break;
						case 'l':
							str_arg_l += sprintf(tmp + str_arg_l, f, ulong_arg);
							break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
						case '2':
							str_arg_l += sprintf(tmp + str_arg_l, f, ulong_long_arg);
							break;
#endif
						}
					}
					/* include the optional minus sign and possible "0x"
					in the region before the zero padding insertion point */
					if (zero_padding_insertion_ind < str_arg_l &&
					        tmp[zero_padding_insertion_ind] == '-') {
						zero_padding_insertion_ind++;
					}
					if (zero_padding_insertion_ind + 1 < str_arg_l &&
					        tmp[zero_padding_insertion_ind]   == '0' &&
					        (tmp[zero_padding_insertion_ind+1] == 'x' ||
					         tmp[zero_padding_insertion_ind+1] == 'X')) {
						zero_padding_insertion_ind += 2;
					}
				}
				{
					size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
					if (alternate_form && fmt_spec == 'o'
					        /* unless zero is already the first character */
					        && !(zero_padding_insertion_ind < str_arg_l
					             && tmp[zero_padding_insertion_ind] == '0')
					   ) {        /* assure leading zero for alternate-form octal numbers */
						if (!precision_specified || precision < num_of_digits + 1) {
							/* precision is increased to force the first character to be zero,
							except if a zero value is formatted with an explicit precision
							    of zero */
							precision = num_of_digits + 1;
							precision_specified = 1;
						}
					}
					/* zero padding to specified precision? */
					if (num_of_digits < precision)
						number_of_zeros_to_pad = precision - num_of_digits;
				}
				/* zero padding to specified minimal field width? */
				if (!justify_left && zero_padding) {
					int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
					if (n > 0) number_of_zeros_to_pad += n;
				}
				break;
			}
			default: /* unrecognized conversion specifier, keep format string as-is*/
				zero_padding = 0;  /* turn zero padding off for non-numeric convers. */
				justify_left = 1;
				min_field_width = 0;                /* reset flags */
				/* discard the unrecognized conversion, just keep *
				* the unrecognized conversion character          */
				str_arg = p;
				str_arg_l = 0;
				if (*p) str_arg_l++;  /* include invalid conversion specifier unchanged
		  if not at end-of-string */
				break;
			}
			if (*p) p++;      /* step over the just processed conversion specifier */
			/* insert padding to the left as requested by min_field_width;
			this does not include the zero padding in case of numerical conversions*/
			if (!justify_left) {                /* left padding with blank or zero */
				int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
				if (n > 0) {
					if (str_l < str_m) {
						size_t avail = str_m - str_l;
						fast_memset(str + str_l, (zero_padding ? '0' : ' '), (n > avail ? avail : n));
					}
					str_l += n;
				}
			}
			/* zero padding as requested by the precision or by the minimal field width
			* for numeric conversions required? */
			if (number_of_zeros_to_pad <= 0) {
				/* will not copy first part of numeric right now, *
				    * force it to be copied later in its entirety    */
				zero_padding_insertion_ind = 0;
			} else {
				/* insert first part of numerics (sign or '0x') before zero padding */
				int n = zero_padding_insertion_ind;
				if (n > 0) {
					if (str_l < str_m) {
						size_t avail = str_m - str_l;
						fast_memcpy(str + str_l, str_arg, (n > avail ? avail : n));
					}
					str_l += n;
				}
				/* insert zero padding as requested by the precision or min field width */
				n = number_of_zeros_to_pad;
				if (n > 0) {
					if (str_l < str_m) {
						size_t avail = str_m - str_l;
						fast_memset(str + str_l, '0', (n > avail ? avail : n));
					}
					str_l += n;
				}
			}
			/* insert formatted string
			* (or as-is conversion specifier for unknown conversions) */
			{
				int n = str_arg_l - zero_padding_insertion_ind;
				if (n > 0) {
					if (str_l < str_m) {
						size_t avail = str_m - str_l;
						fast_memcpy(str + str_l, str_arg + zero_padding_insertion_ind,
						            (n > avail ? avail : n));
					}
					str_l += n;
				}
			}
			/* insert right padding */
			if (justify_left) {          /* right blank padding to the field width */
				int n = min_field_width - (str_arg_l + number_of_zeros_to_pad);
				if (n > 0) {
					if (str_l < str_m) {
						size_t avail = str_m - str_l;
						fast_memset(str + str_l, ' ', (n > avail ? avail : n));
					}
					str_l += n;
				}
			}
		}
	}
	if (str_m > 0) { /* make sure the string is null-terminated
				   even at the expense of overwriting the last character
	  (shouldn't happen, but just in case) */
		str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
	}
	/* Return the number of characters formatted (excluding trailing null
	 * character), that is, the number of characters that would have been
	 * written to the buffer if it were large enough.
	 *
	 * The value of str_l should be returned, but str_l is of unsigned type
	 * size_t, and snprintf is int, possibly leading to an undetected
	 * integer overflow, resulting in a negative return value, which is illegal.
	 * Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
	 * Should errno be set to EOVERFLOW and EOF returned in this case???
	 */
	return (int) str_l;
}

int symbian_snprintf(char *text, size_t maxlen, const char *fmt, ...) {
	va_list ap;
	int retval;

	va_start(ap, fmt);
	retval = symbian_vsnprintf(text, maxlen, fmt, ap);
	va_end(ap);

	return retval;
}