📄 trio.c
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/*************************************************************************
*
* $Id: trio.c,v 1.11 2003/04/03 15:28:27 veillard Exp $
*
* Copyright (C) 1998 Bjorn Reese and Daniel Stenberg.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND
* CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER.
*
*************************************************************************
*
* A note to trio contributors:
*
* Avoid heap allocation at all costs to ensure that the trio functions
* are async-safe. The exceptions are the printf/fprintf functions, which
* uses fputc, and the asprintf functions and the <alloc> modifier, which
* by design are required to allocate form the heap.
*
************************************************************************/
/*
* TODO:
* - Scan is probably too permissive about its modifiers.
* - C escapes in %#[] ?
* - Multibyte characters (done for format parsing, except scan groups)
* - Complex numbers? (C99 _Complex)
* - Boolean values? (C99 _Bool)
* - C99 NaN(n-char-sequence) missing. The n-char-sequence can be used
* to print the mantissa, e.g. NaN(0xc000000000000000)
* - Should we support the GNU %a alloc modifier? GNU has an ugly hack
* for %a, because C99 used %a for other purposes. If specified as
* %as or %a[ it is interpreted as the alloc modifier, otherwise as
* the C99 hex-float. This means that you cannot scan %as as a hex-float
* immediately followed by an 's'.
* - Scanning of collating symbols.
*/
/*************************************************************************
* Trio include files
*/
#include "triodef.h"
#include "trio.h"
#include "triop.h"
#include "trionan.h"
#if !defined(TRIO_MINIMAL)
# include "triostr.h"
#endif
/**************************************************************************
*
* Definitions
*
*************************************************************************/
#include <math.h>
#include <limits.h>
#include <float.h>
#if defined(__STDC_ISO_10646__) || defined(MB_LEN_MAX) || defined(USE_MULTIBYTE) || TRIO_WIDECHAR
# define TRIO_COMPILER_SUPPORTS_MULTIBYTE
# if !defined(MB_LEN_MAX)
# define MB_LEN_MAX 6
# endif
#endif
#if (defined(TRIO_COMPILER_MSVC) && (_MSC_VER >= 1100)) || defined(TRIO_COMPILER_BCB)
# define TRIO_COMPILER_SUPPORTS_MSVC_INT
#endif
/*************************************************************************
* Generic definitions
*/
#if !(defined(DEBUG) || defined(NDEBUG))
# define NDEBUG
#endif
#include <assert.h>
#include <ctype.h>
#if !defined(TRIO_COMPILER_SUPPORTS_C99)
# define isblank(x) (((x)==32) || ((x)==9))
#endif
#if defined(TRIO_COMPILER_ANCIENT)
# include <varargs.h>
#else
# include <stdarg.h>
#endif
#include <stddef.h>
#include <errno.h>
#ifndef NULL
# define NULL 0
#endif
#define NIL ((char)0)
#ifndef FALSE
# define FALSE (1 == 0)
# define TRUE (! FALSE)
#endif
#define BOOLEAN_T int
/* mincore() can be used for debugging purposes */
#define VALID(x) (NULL != (x))
#if TRIO_ERRORS
/*
* Encode the error code and the position. This is decoded
* with TRIO_ERROR_CODE and TRIO_ERROR_POSITION.
*/
# define TRIO_ERROR_RETURN(x,y) (- ((x) + ((y) << 8)))
#else
# define TRIO_ERROR_RETURN(x,y) (-1)
#endif
typedef unsigned long trio_flags_t;
/*************************************************************************
* Platform specific definitions
*/
#if defined(TRIO_PLATFORM_UNIX)
# include <unistd.h>
# include <signal.h>
# include <locale.h>
# define USE_LOCALE
#endif /* TRIO_PLATFORM_UNIX */
#if defined(TRIO_PLATFORM_VMS)
# include <unistd.h>
#endif
#if defined(TRIO_PLATFORM_WIN32)
# include <io.h>
# define read _read
# define write _write
#endif /* TRIO_PLATFORM_WIN32 */
#if TRIO_WIDECHAR
# if defined(TRIO_COMPILER_SUPPORTS_ISO94)
# include <wchar.h>
# include <wctype.h>
typedef wchar_t trio_wchar_t;
typedef wint_t trio_wint_t;
# else
typedef char trio_wchar_t;
typedef int trio_wint_t;
# define WCONST(x) L ## x
# define WEOF EOF
# define iswalnum(x) isalnum(x)
# define iswalpha(x) isalpha(x)
# define iswblank(x) isblank(x)
# define iswcntrl(x) iscntrl(x)
# define iswdigit(x) isdigit(x)
# define iswgraph(x) isgraph(x)
# define iswlower(x) islower(x)
# define iswprint(x) isprint(x)
# define iswpunct(x) ispunct(x)
# define iswspace(x) isspace(x)
# define iswupper(x) isupper(x)
# define iswxdigit(x) isxdigit(x)
# endif
#endif
/*************************************************************************
* Compiler dependent definitions
*/
/* Support for long long */
#ifndef __cplusplus
# if !defined(USE_LONGLONG)
# if defined(TRIO_COMPILER_GCC) && !defined(__STRICT_ANSI__)
# define USE_LONGLONG
# elif defined(TRIO_COMPILER_SUNPRO)
# define USE_LONGLONG
# elif defined(_LONG_LONG) || defined(_LONGLONG)
# define USE_LONGLONG
# endif
# endif
#endif
/* The extra long numbers */
#if defined(USE_LONGLONG)
typedef signed long long int trio_longlong_t;
typedef unsigned long long int trio_ulonglong_t;
#elif defined(TRIO_COMPILER_SUPPORTS_MSVC_INT)
typedef signed __int64 trio_longlong_t;
typedef unsigned __int64 trio_ulonglong_t;
#else
typedef TRIO_SIGNED long int trio_longlong_t;
typedef unsigned long int trio_ulonglong_t;
#endif
/* Maximal and fixed integer types */
#if defined(TRIO_COMPILER_SUPPORTS_C99)
# include <stdint.h>
typedef intmax_t trio_intmax_t;
typedef uintmax_t trio_uintmax_t;
typedef int8_t trio_int8_t;
typedef int16_t trio_int16_t;
typedef int32_t trio_int32_t;
typedef int64_t trio_int64_t;
#elif defined(TRIO_COMPILER_SUPPORTS_UNIX98)
# include <inttypes.h>
typedef intmax_t trio_intmax_t;
typedef uintmax_t trio_uintmax_t;
typedef int8_t trio_int8_t;
typedef int16_t trio_int16_t;
typedef int32_t trio_int32_t;
typedef int64_t trio_int64_t;
#elif defined(TRIO_COMPILER_SUPPORTS_MSVC_INT)
typedef trio_longlong_t trio_intmax_t;
typedef trio_ulonglong_t trio_uintmax_t;
typedef __int8 trio_int8_t;
typedef __int16 trio_int16_t;
typedef __int32 trio_int32_t;
typedef __int64 trio_int64_t;
#else
typedef trio_longlong_t trio_intmax_t;
typedef trio_ulonglong_t trio_uintmax_t;
# if defined(TRIO_INT8_T)
typedef TRIO_INT8_T trio_int8_t;
# else
typedef TRIO_SIGNED char trio_int8_t;
# endif
# if defined(TRIO_INT16_T)
typedef TRIO_INT16_T trio_int16_t;
# else
typedef TRIO_SIGNED short trio_int16_t;
# endif
# if defined(TRIO_INT32_T)
typedef TRIO_INT32_T trio_int32_t;
# else
typedef TRIO_SIGNED int trio_int32_t;
# endif
# if defined(TRIO_INT64_T)
typedef TRIO_INT64_T trio_int64_t;
# else
typedef trio_longlong_t trio_int64_t;
# endif
#endif
#if !(defined(TRIO_COMPILER_SUPPORTS_C99) \
|| defined(TRIO_COMPILER_SUPPORTS_UNIX01))
# define floorl(x) floor((double)(x))
# define fmodl(x,y) fmod((double)(x),(double)(y))
# define powl(x,y) pow((double)(x),(double)(y))
#endif
#define TRIO_FABS(x) (((x) < 0.0) ? -(x) : (x))
/*************************************************************************
* Internal Definitions
*/
#ifndef DECIMAL_DIG
# define DECIMAL_DIG DBL_DIG
#endif
/* Long double sizes */
#ifdef LDBL_DIG
# define MAX_MANTISSA_DIGITS LDBL_DIG
# define MAX_EXPONENT_DIGITS 4
# define MAX_DOUBLE_DIGITS LDBL_MAX_10_EXP
#else
# define MAX_MANTISSA_DIGITS DECIMAL_DIG
# define MAX_EXPONENT_DIGITS 3
# define MAX_DOUBLE_DIGITS DBL_MAX_10_EXP
#endif
#if defined(TRIO_COMPILER_ANCIENT) || !defined(LDBL_DIG)
# undef LDBL_DIG
# undef LDBL_MANT_DIG
# undef LDBL_EPSILON
# define LDBL_DIG DBL_DIG
# define LDBL_MANT_DIG DBL_MANT_DIG
# define LDBL_EPSILON DBL_EPSILON
#endif
/* The maximal number of digits is for base 2 */
#define MAX_CHARS_IN(x) (sizeof(x) * CHAR_BIT)
/* The width of a pointer. The number of bits in a hex digit is 4 */
#define POINTER_WIDTH ((sizeof("0x") - 1) + sizeof(trio_pointer_t) * CHAR_BIT / 4)
/* Infinite and Not-A-Number for floating-point */
#define INFINITE_LOWER "inf"
#define INFINITE_UPPER "INF"
#define LONG_INFINITE_LOWER "infinite"
#define LONG_INFINITE_UPPER "INFINITE"
#define NAN_LOWER "nan"
#define NAN_UPPER "NAN"
/* Various constants */
enum {
TYPE_PRINT = 1,
TYPE_SCAN = 2,
/* Flags. FLAGS_LAST must be less than ULONG_MAX */
FLAGS_NEW = 0,
FLAGS_STICKY = 1,
FLAGS_SPACE = 2 * FLAGS_STICKY,
FLAGS_SHOWSIGN = 2 * FLAGS_SPACE,
FLAGS_LEFTADJUST = 2 * FLAGS_SHOWSIGN,
FLAGS_ALTERNATIVE = 2 * FLAGS_LEFTADJUST,
FLAGS_SHORT = 2 * FLAGS_ALTERNATIVE,
FLAGS_SHORTSHORT = 2 * FLAGS_SHORT,
FLAGS_LONG = 2 * FLAGS_SHORTSHORT,
FLAGS_QUAD = 2 * FLAGS_LONG,
FLAGS_LONGDOUBLE = 2 * FLAGS_QUAD,
FLAGS_SIZE_T = 2 * FLAGS_LONGDOUBLE,
FLAGS_PTRDIFF_T = 2 * FLAGS_SIZE_T,
FLAGS_INTMAX_T = 2 * FLAGS_PTRDIFF_T,
FLAGS_NILPADDING = 2 * FLAGS_INTMAX_T,
FLAGS_UNSIGNED = 2 * FLAGS_NILPADDING,
FLAGS_UPPER = 2 * FLAGS_UNSIGNED,
FLAGS_WIDTH = 2 * FLAGS_UPPER,
FLAGS_WIDTH_PARAMETER = 2 * FLAGS_WIDTH,
FLAGS_PRECISION = 2 * FLAGS_WIDTH_PARAMETER,
FLAGS_PRECISION_PARAMETER = 2 * FLAGS_PRECISION,
FLAGS_BASE = 2 * FLAGS_PRECISION_PARAMETER,
FLAGS_BASE_PARAMETER = 2 * FLAGS_BASE,
FLAGS_FLOAT_E = 2 * FLAGS_BASE_PARAMETER,
FLAGS_FLOAT_G = 2 * FLAGS_FLOAT_E,
FLAGS_QUOTE = 2 * FLAGS_FLOAT_G,
FLAGS_WIDECHAR = 2 * FLAGS_QUOTE,
FLAGS_ALLOC = 2 * FLAGS_WIDECHAR,
FLAGS_IGNORE = 2 * FLAGS_ALLOC,
FLAGS_IGNORE_PARAMETER = 2 * FLAGS_IGNORE,
FLAGS_VARSIZE_PARAMETER = 2 * FLAGS_IGNORE_PARAMETER,
FLAGS_FIXED_SIZE = 2 * FLAGS_VARSIZE_PARAMETER,
FLAGS_LAST = FLAGS_FIXED_SIZE,
/* Reused flags */
FLAGS_EXCLUDE = FLAGS_SHORT,
FLAGS_USER_DEFINED = FLAGS_IGNORE,
FLAGS_ROUNDING = FLAGS_INTMAX_T,
/* Compounded flags */
FLAGS_ALL_VARSIZES = FLAGS_LONG | FLAGS_QUAD | FLAGS_INTMAX_T | FLAGS_PTRDIFF_T | FLAGS_SIZE_T,
FLAGS_ALL_SIZES = FLAGS_ALL_VARSIZES | FLAGS_SHORTSHORT | FLAGS_SHORT,
NO_POSITION = -1,
NO_WIDTH = 0,
NO_PRECISION = -1,
NO_SIZE = -1,
/* Do not change these */
NO_BASE = -1,
MIN_BASE = 2,
MAX_BASE = 36,
BASE_BINARY = 2,
BASE_OCTAL = 8,
BASE_DECIMAL = 10,
BASE_HEX = 16,
/* Maximal number of allowed parameters */
MAX_PARAMETERS = 64,
/* Maximal number of characters in class */
MAX_CHARACTER_CLASS = UCHAR_MAX + 1,
/* Maximal string lengths for user-defined specifiers */
MAX_USER_NAME = 64,
MAX_USER_DATA = 256,
/* Maximal length of locale separator strings */
MAX_LOCALE_SEPARATOR_LENGTH = MB_LEN_MAX,
/* Maximal number of integers in grouping */
MAX_LOCALE_GROUPS = 64,
/* Initial size of asprintf buffer */
DYNAMIC_START_SIZE = 32
};
#define NO_GROUPING ((int)CHAR_MAX)
/* Fundamental formatting parameter types */
#define FORMAT_UNKNOWN 0
#define FORMAT_INT 1
#define FORMAT_DOUBLE 2
#define FORMAT_CHAR 3
#define FORMAT_STRING 4
#define FORMAT_POINTER 5
#define FORMAT_COUNT 6
#define FORMAT_PARAMETER 7
#define FORMAT_GROUP 8
#if TRIO_GNU
# define FORMAT_ERRNO 9
#endif
#if TRIO_EXTENSION
# define FORMAT_USER_DEFINED 10
#endif
/* Character constants */
#define CHAR_IDENTIFIER '%'
#define CHAR_BACKSLASH '\\'
#define CHAR_QUOTE '\"'
#define CHAR_ADJUST ' '
/* Character class expressions */
#define CLASS_ALNUM "[:alnum:]"
#define CLASS_ALPHA "[:alpha:]"
#define CLASS_BLANK "[:blank:]"
#define CLASS_CNTRL "[:cntrl:]"
#define CLASS_DIGIT "[:digit:]"
#define CLASS_GRAPH "[:graph:]"
#define CLASS_LOWER "[:lower:]"
#define CLASS_PRINT "[:print:]"
#define CLASS_PUNCT "[:punct:]"
#define CLASS_SPACE "[:space:]"
#define CLASS_UPPER "[:upper:]"
#define CLASS_XDIGIT "[:xdigit:]"
/*
* SPECIFIERS:
*
*
* a Hex-float
* A Hex-float
* c Character
* C Widechar character (wint_t)
* d Decimal
* e Float
* E Float
* F Float
* F Float
* g Float
* G Float
* i Integer
* m Error message
* n Count
* o Octal
* p Pointer
* s String
* S Widechar string (wchar_t *)
* u Unsigned
* x Hex
* X Hex
* [] Group
* <> User-defined
*
* Reserved:
*
* D Binary Coded Decimal %D(length,precision) (OS/390)
*/
#define SPECIFIER_CHAR 'c'
#define SPECIFIER_STRING 's'
#define SPECIFIER_DECIMAL 'd'
#define SPECIFIER_INTEGER 'i'
#define SPECIFIER_UNSIGNED 'u'
#define SPECIFIER_OCTAL 'o'
#define SPECIFIER_HEX 'x'
#define SPECIFIER_HEX_UPPER 'X'
#define SPECIFIER_FLOAT_E 'e'
#define SPECIFIER_FLOAT_E_UPPER 'E'
#define SPECIFIER_FLOAT_F 'f'
#define SPECIFIER_FLOAT_F_UPPER 'F'
#define SPECIFIER_FLOAT_G 'g'
#define SPECIFIER_FLOAT_G_UPPER 'G'
#define SPECIFIER_POINTER 'p'
#define SPECIFIER_GROUP '['
#define SPECIFIER_UNGROUP ']'
#define SPECIFIER_COUNT 'n'
#if TRIO_UNIX98
# define SPECIFIER_CHAR_UPPER 'C'
# define SPECIFIER_STRING_UPPER 'S'
#endif
#if TRIO_C99
# define SPECIFIER_HEXFLOAT 'a'
# define SPECIFIER_HEXFLOAT_UPPER 'A'
#endif
#if TRIO_GNU
# define SPECIFIER_ERRNO 'm'
#endif
#if TRIO_EXTENSION
# define SPECIFIER_BINARY 'b'
# define SPECIFIER_BINARY_UPPER 'B'
# define SPECIFIER_USER_DEFINED_BEGIN '<'
# define SPECIFIER_USER_DEFINED_END '>'
# define SPECIFIER_USER_DEFINED_SEPARATOR ':'
#endif
/*
* QUALIFIERS:
*
*
* Numbers = d,i,o,u,x,X
* Float = a,A,e,E,f,F,g,G
* String = s
* Char = c
*
*
* 9$ Position
* Use the 9th parameter. 9 can be any number between 1 and
* the maximal argument
*
* 9 Width
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