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scanf.c
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scanf.c
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/*
scanf implementation
Copyright (C) 2021 Sampo Hippeläinen (hisahi)
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <limits.h>
#include <stddef.h>
/* =============================== *
* defines & checks *
* =============================== */
/* C99/C++11 */
#ifndef SCANF_C99
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) \
|| (defined(__cplusplus) && __cplusplus >= 201103L)
#define SCANF_C99 1
#else
#define SCANF_C99 0
#endif
#endif
/* long long? */
#ifndef LLONG_MAX
#undef SCANF_DISABLE_SUPPORT_LONG_LONG
#define SCANF_DISABLE_SUPPORT_LONG_LONG 1
#endif
/* stdint.h? */
#ifndef SCANF_STDINT
#if SCANF_C99
#define SCANF_STDINT 1
#elif HAVE_STDINT_H
#define SCANF_STDINT 1
#endif
#endif
#if SCANF_STDINT
#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS 1
#endif
#include <stdint.h>
#if SCANF_DISABLE_SUPPORT_LONG_LONG && defined(UINTMAX_MAX) \
&& UINTMAX_MAX == ULLONG_MAX
/* replace (u)intmax_t with (unsigned) long if long long is disabled */
#undef intmax_t
#define intmax_t long
#undef uintmax_t
#define uintmax_t unsigned long
#undef INTMAX_MIN
#define INTMAX_MIN LONG_MIN
#undef INTMAX_MAX
#define INTMAX_MAX LONG_MAX
#undef UINTMAX_MAX
#define UINTMAX_MAX ULONG_MAX
#endif
#else
/* (u)intmax_t, (U)INTMAX_(MIN_MAX) */
#if SCANF_C99 && !SCANF_DISABLE_SUPPORT_LONG_LONG
#ifndef intmax_t
#define intmax_t long long int
#endif
#ifndef uintmax_t
#define uintmax_t unsigned long long int
#endif
#ifndef INTMAX_MIN
#define INTMAX_MIN LLONG_MIN
#endif
#ifndef INTMAX_MAX
#define INTMAX_MAX LLONG_MAX
#endif
#ifndef UINTMAX_MAX
#define UINTMAX_MAX ULLONG_MAX
#endif
#else
#ifndef intmax_t
#define intmax_t long int
#endif
#ifndef uintmax_t
#define uintmax_t unsigned long int
#endif
#ifndef INTMAX_MIN
#define INTMAX_MIN LONG_MIN
#endif
#ifndef INTMAX_MAX
#define INTMAX_MAX LONG_MAX
#endif
#ifndef UINTMAX_MAX
#define UINTMAX_MAX ULONG_MAX
#endif
#endif
#endif
/* maximum precision floating point type */
#ifndef floatmax_t
#define floatmax_t long double
#endif
#ifndef INLINE
#if SCANF_C99
#define INLINE inline
#else
#define INLINE
#endif
#endif
/* boolean type */
#ifndef BOOL
#if defined(__cplusplus)
#define BOOL bool
#elif SCANF_C99
#define BOOL _Bool
#else
#define BOOL char
#endif
#endif
/* freestanding? */
#ifndef SCANF_FREESTANDING
#if defined(__STDC_HOSTED__) && __STDC_HOSTED__ == 0
#define SCANF_FREESTANDING 1
#else
#define SCANF_FREESTANDING 0
#endif
#endif
#ifndef SCANF_NOMATH
#define SCANF_NOMATH SCANF_FREESTANDING
#endif
#ifndef SCANF_INTERNAL_CTYPE
#define SCANF_INTERNAL_CTYPE SCANF_FREESTANDING
#endif
#ifndef SCANF_BINARY
#define SCANF_BINARY 1
#endif
/* this is technically UB, as the character encodings used by the preprocessor
and the actual compiled code might be different. in practice this is hardly
ever an issue, and if it is, you can just define SCANF_ASCII manually */
#ifndef SCANF_ASCII
#if 'B' - 'A' == 1 && 'K' - 'A' == 10 && 'Z' - 'A' == 25 \
&& 'a' - 'A' == 32 && 'n' - 'N' == 32 && 'v' - 'V' == 32 && 'z' - 'Z' == 32 \
&& '3' - '0' == 3 && '9' - '0' == 9
#define SCANF_ASCII 1
#else
#define SCANF_ASCII 0
#endif
#endif
#ifndef SCANF_FAST_SCANSET
#if CHAR_BIT == 8
#define SCANF_FAST_SCANSET 1
#else
#define SCANF_FAST_SCANSET 0
#endif
#endif
/* fast scanset only supported with multibyte/narrow characters */
#undef SCANF_CAN_FAST_SCANSET
#if SCANF_WIDE
#define SCANF_CAN_FAST_SCANSET 0
#else
#define SCANF_CAN_FAST_SCANSET SCANF_FAST_SCANSET
#endif
#ifndef SCANF_NOPOW
#define SCANF_NOPOW 1
#endif
#ifndef SCANF_LOGN_POW
#define SCANF_LOGN_POW 1
#endif
/* wide setup */
#ifndef SCANF_WIDE
#define SCANF_WIDE 0
#endif
#if SCANF_WIDE < 0 || SCANF_WIDE > 3
#error invalid value for SCANF_WIDE (valid: 0, 1, 2, 3)
#endif
#if SCANF_WIDE == 3
#define SCANF_WIDE_CONVERT 1
#endif
#define SCANF_NODEFINE 1
#if SCANF_WIDE
/* also includes wide.h */
#include "wscanf.h"
#else
#include "scanf.h"
#endif
/* include more stuff */
#if !SCANF_INTERNAL_CTYPE
#if SCANF_WIDE
#include <wctype.h>
#define isdigitw_ iswdigit
#define isspacew_ iswspace
#define isalnumw_ iswalnum
#define isalphaw_ iswalpha
#define tolowerw_ towlower
#else
#include <ctype.h>
#endif
#endif
/* type & literal defines */
#undef C_
#undef S_
#undef F_
#undef CHAR
#undef UCHAR
#undef CINT
#if SCANF_WIDE
/* character */
#ifdef MAKE_WCHAR
#define C_(x) MAKE_WCHAR(x)
#else
#define C_(x) L##x
#endif
/* string */
#ifdef MAKE_WSTRING
#define S_(x) MAKE_WSTRING(x)
#else
#define S_(x) L##x
#endif
/* function */
#define F_(x) x##w_
#define CHAR WCHAR
#define UCHAR WCHAR
#define CINT WINT
#else
/* character */
#define C_(x) x
/* string */
#define S_(x) x
/* function */
#define F_(x) x
#define CHAR char
#define UCHAR unsigned char
#define CINT int
#endif
#if !SCANF_DISABLE_SUPPORT_FLOAT
#include <float.h>
#endif
#if !SCANF_NOMATH
#include <math.h>
#endif
#ifndef SCANF_INFINITE
#if SCANF_C99 && !SCANF_NOMATH && defined(NAN) && defined(INFINITY)
#define SCANF_INFINITE 1
#else
#define SCANF_INFINITE 0
#endif
#endif
#if SCANF_ASCII
#define INLINE_IF_ASCII INLINE
#else
#define INLINE_IF_ASCII
#endif
#ifndef EOF
#define EOF -1
#endif
/* WEOF from wide.h */
/* try to map size_t to unsigned long long, unsigned long, or int */
#if defined(SIZE_MAX)
#if defined(ULLONG_MAX) && SIZE_MAX == ULLONG_MAX
#if SCANF_DISABLE_SUPPORT_LONG_LONG
#define SIZET_DISABLE 1
#pragma message("size_t == long long (disabled), so it will be disabled too")
#else
#define SIZET_ALIAS ll
#endif
#elif defined(ULONG_MAX) && SIZE_MAX == ULONG_MAX
#define SIZET_ALIAS l
#elif defined(UINT_MAX) && SIZE_MAX == UINT_MAX
#define SIZET_ALIAS
/* intentionally empty -> maps to int */
#endif
#endif
/* this is intentionally after the previous check */
#ifndef SIZE_MAX
#define SIZE_MAX (size_t)(-1)
#endif
/* try to map ptrdiff_t to long long, long, or int */
#if defined(PTRDIFF_MAX)
#if defined(LLONG_MAX) && PTRDIFF_MAX == LLONG_MAX && PTRDIFF_MIN == LLONG_MIN
#if SCANF_DISABLE_SUPPORT_LONG_LONG
#define PTRDIFFT_DISABLE 1
#pragma message("ptrdiff_t == long long (disabled), so it will be disabled too")
#else
#define PTRDIFFT_ALIAS ll
#endif
#elif defined(LONG_MAX) && PTRDIFF_MAX == LONG_MAX && PTRDIFF_MIN == LONG_MIN
#define PTRDIFFT_ALIAS l
#elif defined(INT_MAX) && PTRDIFF_MAX == INT_MAX && PTRDIFF_MIN == INT_MIN
#define PTRDIFFT_ALIAS
/* intentionally empty -> maps to int */
#endif
#endif
/* try to map intmax_t to unsigned long long or unsigned long */
#if defined(INTMAX_MAX) && defined(UINTMAX_MAX)
#if !SCANF_DISABLE_SUPPORT_LONG_LONG && \
(defined(LLONG_MAX) && INTMAX_MAX == LLONG_MAX && INTMAX_MIN == LLONG_MIN) \
&& (defined(ULLONG_MAX) && UINTMAX_MAX == ULLONG_MAX)
#define INTMAXT_ALIAS ll
#elif (defined(LONG_MAX) && INTMAX_MAX == LONG_MAX && INTMAX_MIN == LONG_MIN) \
&& (defined(ULONG_MAX) && UINTMAX_MAX == ULONG_MAX)
#define INTMAXT_ALIAS l
#endif
#endif
/* check if short == int */
#if defined(INT_MIN) && defined(SHRT_MIN) && INT_MIN == SHRT_MIN \
&& defined(INT_MAX) && defined(SHRT_MAX) && INT_MAX == SHRT_MAX \
&& defined(UINT_MAX) && defined(USHRT_MAX) && UINT_MAX == USHRT_MAX
#define SHORT_IS_INT 1
#endif
/* check if long == int */
#if defined(INT_MIN) && defined(LONG_MIN) && INT_MIN == LONG_MIN \
&& defined(INT_MAX) && defined(LONG_MAX) && INT_MAX == LONG_MAX \
&& defined(UINT_MAX) && defined(ULONG_MAX) && UINT_MAX == ULONG_MAX
#define LONG_IS_INT 1
#endif
/* check if long long == long */
#if defined(LONG_MIN) && defined(LLONG_MIN) && LONG_MIN == LLONG_MIN \
&& defined(LONG_MAX) && defined(LLONG_MAX) && LONG_MAX == LLONG_MAX \
&& defined(ULONG_MAX) && defined(ULLONG_MAX) && ULONG_MAX == ULLONG_MAX
#define LLONG_IS_LONG 1
#endif
#if !SCANF_DISABLE_SUPPORT_FLOAT
/* check if double == float */
#if defined(FLT_MANT_DIG) && defined(DBL_MANT_DIG) \
&& FLT_MANT_DIG == DBL_MANT_DIG \
&& defined(FLT_MIN_EXP) && defined(DBL_MIN_EXP) \
&& FLT_MIN_EXP == DBL_MIN_EXP \
&& defined(FLT_MAX_EXP) && defined(DBL_MAX_EXP) \
&& FLT_MAX_EXP == DBL_MAX_EXP
#define DOUBLE_IS_FLOAT 1
#endif
/* check if long double == double */
#if defined(DBL_MANT_DIG) && defined(LDBL_MANT_DIG) \
&& DBL_MANT_DIG == LDBL_MANT_DIG \
&& defined(DBL_MIN_EXP) && defined(LDBL_MIN_EXP) \
&& DBL_MIN_EXP == LDBL_MIN_EXP \
&& defined(DBL_MAX_EXP) && defined(LDBL_MAX_EXP) \
&& DBL_MAX_EXP == LDBL_MAX_EXP
#define LDOUBLE_IS_DOUBLE 1
#endif
#endif
#ifdef UINTPTR_MAX
#define INT_TO_PTR(x) ((void*)(uintptr_t)(uintmax_t)(x))
#else
#define INT_TO_PTR(x) ((void*)(uintmax_t)(x))
#endif
#if SCANF_CLAMP
/* try to figure out values for PTRDIFF_MAX and PTRDIFF_MIN */
#ifndef PTRDIFF_MAX
#define PTRDIFF_MAX ptrdiff_max_
#define PTRDIFF_MAX_COMPUTE 1
#endif
#ifndef PTRDIFF_MIN
#define PTRDIFF_MIN ptrdiff_min_
#define PTRDIFF_MIN_COMPUTE 1
#endif
#endif
/* =============================== *
* digit conversion *
* =============================== */
static INLINE_IF_ASCII int F_(ctodn_)(CINT c) {
#if SCANF_ASCII
return c - C_('0');
#else
switch (c) {
case C_('0'): return 0;
case C_('1'): return 1;
case C_('2'): return 2;
case C_('3'): return 3;
case C_('4'): return 4;
case C_('5'): return 5;
case C_('6'): return 6;
case C_('7'): return 7;
case C_('8'): return 8;
case C_('9'): return 9;
default: return -1;
}
#endif
}
static INLINE_IF_ASCII int F_(ctoon_)(CINT c) {
#if SCANF_ASCII
return c - C_('0');
#else
switch (c) {
case C_('0'): return 0;
case C_('1'): return 1;
case C_('2'): return 2;
case C_('3'): return 3;
case C_('4'): return 4;
case C_('5'): return 5;
case C_('6'): return 6;
case C_('7'): return 7;
default: return -1;
}
#endif
}
static int F_(ctoxn_)(CINT c) {
#if SCANF_ASCII
if (c >= C_('a'))
return c - C_('a') + 10;
else if (c >= C_('A'))
return c - C_('A') + 10;
return c - C_('0');
#else
switch (c) {
case C_('0'): return 0;
case C_('1'): return 1;
case C_('2'): return 2;
case C_('3'): return 3;
case C_('4'): return 4;
case C_('5'): return 5;
case C_('6'): return 6;
case C_('7'): return 7;
case C_('8'): return 8;
case C_('9'): return 9;
case C_('A'): case C_('a'): return 10;
case C_('B'): case C_('b'): return 11;
case C_('C'): case C_('c'): return 12;
case C_('D'): case C_('d'): return 13;
case C_('E'): case C_('e'): return 14;
case C_('F'): case C_('f'): return 15;
default: return -1;
}
#endif
}
#if SCANF_BINARY
static INLINE_IF_ASCII int F_(ctobn_)(CINT c) {
#if SCANF_ASCII
return c - C_('0');
#else
switch (c) {
case C_('0'): return 0;
case C_('1'): return 1;
default: return -1;
}
#endif
}
#endif
static int F_(ctorn_)(CINT c, int b) {
switch (b) {
case 8:
return F_(ctoon_)(c);
case 16:
return F_(ctoxn_)(c);
#if SCANF_BINARY
case 2:
return F_(ctobn_)(c);
#endif
default: /* 10 */
return F_(ctodn_)(c);
}
}
/* =============================== *
* character checks *
* =============================== */
#if SCANF_INTERNAL_CTYPE
static int F_(isspace)(CINT c) {
switch (c) {
case C_(' '):
case C_('\t'):
case C_('\n'):
case C_('\v'):
case C_('\f'):
case C_('\r'):
return 1;
}
return 0;
}
static INLINE int F_(isdigit)(CINT c) {
#if SCANF_ASCII
return C_('0') <= c && c <= C_('9');
#else
return F_(ctodn_)(c) >= 0;
#endif
}
#if SCANF_INFINITE
#if SCANF_ASCII
static int F_(isalpha)(CINT c) {
return (C_('A') <= c && c <= C_('Z')) || (C_('a') <= c && c <= C_('z'));
}
static INLINE CINT F_(tolower)(CINT c) {
return F_(isalpha)(c) ? c | 0x20 : c;
}
#else
static int F_(isalpha)(CINT c) {
switch (c) {
case _C('A'): case _C('N'): case _C('a'): case _C('n'):
case _C('B'): case _C('O'): case _C('b'): case _C('o'):
case _C('C'): case _C('P'): case _C('c'): case _C('p'):
case _C('D'): case _C('Q'): case _C('d'): case _C('q'):
case _C('E'): case _C('R'): case _C('e'): case _C('r'):
case _C('F'): case _C('S'): case _C('f'): case _C('s'):
case _C('G'): case _C('T'): case _C('g'): case _C('t'):
case _C('H'): case _C('U'): case _C('h'): case _C('u'):
case _C('I'): case _C('V'): case _C('i'): case _C('v'):
case _C('J'): case _C('W'): case _C('j'): case _C('w'):
case _C('K'): case _C('X'): case _C('k'): case _C('x'):
case _C('L'): case _C('Y'): case _C('l'): case _C('y'):
case _C('M'): case _C('Z'): case _C('m'): case _C('z'):
return 1;
}
return 0;
}
static CINT F_(tolower)(CINT c) {
switch (c) {
case _C('A'): return _C('a'); case _C('N'): return _C('n');
case _C('B'): return _C('b'); case _C('O'): return _C('o');
case _C('C'): return _C('c'); case _C('P'): return _C('p');
case _C('D'): return _C('d'); case _C('Q'): return _C('q');
case _C('E'): return _C('e'); case _C('R'): return _C('r');
case _C('F'): return _C('f'); case _C('S'): return _C('s');
case _C('G'): return _C('g'); case _C('T'): return _C('t');
case _C('H'): return _C('h'); case _C('U'): return _C('u');
case _C('I'): return _C('i'); case _C('V'): return _C('v');
case _C('J'): return _C('j'); case _C('W'): return _C('w');
case _C('K'): return _C('k'); case _C('X'): return _C('x');
case _C('L'): return _C('l'); case _C('Y'): return _C('y');
case _C('M'): return _C('m'); case _C('Z'): return _C('z');
}
return c;
}
#endif /* SCANF_ASCII */
static INLINE int F_(isalnum)(CINT c) {
return F_(isdigit)(c) || F_(isalpha)(c);
}
#endif /* SCANF_INFINITE */
#endif /* SCANF_INTERNAL_CTYPE */
/* case-insensitive character comparison. compares character c to
upper (uppercase) and lower (lowercase). only defined if upper and lower
are letters and it applies that tolower(upper) == lower */
#ifndef SCANF_REPEAT
#if SCANF_ASCII
#define ICASEEQ(c, upper, lower) ((((CINT)(c)) & ~0x20U) == (CINT)(C_(upper)))
#else
#define ICASEEQ(c, upper, lower) (((c) == C_(upper)) || ((c) == C_(lower)))
#endif
#endif
static INLINE int F_(isdigo_)(CINT c) {
#if SCANF_ASCII
return C_('0') <= c && c <= C_('7');
#else
return F_(ctoon_)(c) >= 0;
#endif
}
static INLINE int F_(isdigx_)(CINT c) {
#if SCANF_ASCII
return F_(isdigit)(c) || (C_('A') <= c && c <= C_('F'))
|| (C_('a') <= c && c <= C_('f'));
#else
return F_(ctoxn_)(c) >= 0;
#endif
}
#if SCANF_BINARY
static INLINE int F_(isdigb_)(CINT c) {
return c == C_('0') || c == C_('1');
}
#endif
static INLINE int F_(isdigr_)(CINT c, int b) {
switch (b) {
case 8:
return F_(isdigo_)(c);
case 16:
return F_(isdigx_)(c);
#if SCANF_BINARY
case 2:
return F_(isdigb_)(c);
#endif
default: /* 10 */
return F_(isdigit)(c);
}
}
/* =============================== *
* integer math *
* =============================== */
#if SCANF_CLAMP && !defined(SCANF_REPEAT)
static INLINE intmax_t clamps_(intmax_t m0, intmax_t v, intmax_t m1) {
return v < m0 ? m0 : v > m1 ? m1 : v;
}
static INLINE uintmax_t clampu_(uintmax_t m0, uintmax_t v, uintmax_t m1) {
return v < m0 ? m0 : v > m1 ? m1 : v;
}
#endif /* SCANF_CLAMP && !defined(SCANF_REPEAT) */
/* =============================== *
* floating point math *
* =============================== */
#ifndef SCANF_REPEAT
#if !SCANF_DISABLE_SUPPORT_FLOAT
#if !SCANF_NOPOW
static INLINE floatmax_t powi_(floatmax_t x, intmax_t y) {
return pow(x, y);
}
#elif SCANF_LOGN_POW
static floatmax_t powi_(floatmax_t x, intmax_t y) {
floatmax_t r = (floatmax_t)1;
for (; y > 0; y >>= 1) {
if (y & 1) r *= x;
x *= x;
}
return r;
}
#else
static floatmax_t powi_(floatmax_t x, intmax_t y) {
floatmax_t r = (floatmax_t)1;
for (; y > 0; --y)
r *= x;
return r;
}
#endif
#endif /* !SCANF_DISABLE_SUPPORT_FLOAT */
#endif /* SCANF_REPEAT */
/* =============================== *
* scanset functions *
* =============================== */
#if !SCANF_DISABLE_SUPPORT_SCANSET && !SCANF_CAN_FAST_SCANSET
static BOOL F_(inscan_)(const UCHAR *begin, const UCHAR *end, UCHAR c) {
BOOL hyphen = 0;
UCHAR prev = 0, f;
const UCHAR *p = begin;
while (p < end) {
f = *p++;
if (hyphen) {
if (prev <= c && c <= f)
return 1;
hyphen = 0;
prev = f;
} else if (f == C_('-') && prev) {
hyphen = 1;
} else if (f == c)
return 1;
else
prev = f;
}
return hyphen && c == C_('-');
}
#endif
/* =============================== *
* conversion functions *
* =============================== */
#ifndef SCANF_REPEAT
/* still characters to read? (not EOF and width not exceeded) */
#define KEEP_READING() (nowread < maxlen && !GOT_EOF())
/* read next char and increment counter */
#define NEXT_CHAR(counter) (next = getch(p), ++counter)
#endif
#undef IS_EOF
#undef GCEOF
/* EOF check */
#if SCANF_WIDE
#define IS_EOF(c) ((c) == WEOF)
#define GCEOF WEOF
#else
#define IS_EOF(c) ((c) < 0)
#define GCEOF EOF
#endif
#undef GOT_EOF
#define GOT_EOF() (IS_EOF(next))
/* convert stream to integer
getch: stream read function
p: pointer to pass to above
nextc: pointer to next character in buffer
readin: pointer to number of characters read
maxlen: value that *readin should be at most
base: 10 for decimal, 16 for hexadecimal, etc.
unsign: whether the result should be unsigned
negative: whether there was a - sign
zero: if no digits, allow zero (i.e. read zero before iaton_)
dest: intmax_t* or uintmax_t*, where result is stored
return value: 1 if conversion OK, 0 if not
(if 0, dest guaranteed to not be modified)
*/
static INLINE BOOL F_(iaton_)(CINT (*getch)(void *p), void *p, CINT *nextc,
size_t *readin, size_t maxlen, int base, BOOL unsign,
BOOL negative, BOOL zero, void *dest) {
CINT next = *nextc;
size_t nowread = *readin;
uintmax_t r = 0, pr = 0;
/* read digits? overflow? */
BOOL digit = 0, ovf = 0;
#if !SCANF_MINIMIZE
/* skip initial zeros */
while (KEEP_READING() && next == C_('0')) {
digit = 1;
NEXT_CHAR(nowread);
}
#endif
/* read digits and convert to integer */
while (KEEP_READING() && F_(isdigr_)(next, base)) {
if (!ovf) {
digit = 1;
r = r * base + F_(ctorn_)(next, base);
if (pr > r)
ovf = 1;
else
pr = r;
}
NEXT_CHAR(nowread);
}
/* if no digits read? */
if (digit) {
/* overflow detection, negation, etc. */
if (unsign) {
if (ovf)
r = (intmax_t)UINTMAX_MAX;
else if (negative)
#if SCANF_CLAMP
r = 0;
#else
r = (uintmax_t)-r;
#endif
*(uintmax_t *)dest = r;
} else {
intmax_t sr;
if (ovf || (negative ? (intmax_t)r < 0
: r > (uintmax_t)INTMAX_MAX))
sr = negative ? INTMAX_MIN : INTMAX_MAX;
else {
sr = negative ? -(intmax_t)r : (intmax_t)r;
}
*(intmax_t *)dest = sr;
}
} else if (zero) {
if (unsign)
*(uintmax_t *)dest = 0;
else
*(intmax_t *)dest = 0;
digit = 1;
}
*nextc = next;
*readin = nowread;
return digit;
}
#if !SCANF_DISABLE_SUPPORT_FLOAT
/* convert stream to floating point
getch: stream read function
p: pointer to pass to above
nextc: pointer to next character in buffer
readin: pointer to number of characters read
maxlen: value that *readin should be at most
hex: whether in hex mode
negative: whether there was a - sign
zero: if no digits, allow zero (i.e. read zero before iatof_)
dest: floatmax_t*, where result is stored
return value: 1 if conversion OK, 0 if not
(if 0, dest guaranteed to not be modified)
*/
static INLINE BOOL F_(iatof_)(CINT (*getch)(void *p), void *p, CINT *nextc,
size_t *readin, size_t maxlen, BOOL hex, BOOL negative,
BOOL zero, floatmax_t *dest) {
CINT next = *nextc;
size_t nowread = *readin;
floatmax_t r = 0, pr = 0;
/* saw dot? saw digit? was there an overflow? */
BOOL dot = 0, digit = 0, ovf = 0;
/* exponent, offset (with decimals, etc.) */
intmax_t exp = 0, off = 0;
/* how much to subtract from off with every digit */
int sub = 0;
/* base */
int base = hex ? 16 : 10;
/* exponent character */
CHAR expuc = hex ? 'P' : 'E', explc = hex ? 'p' : 'e';
#if !SCANF_MINIMIZE
while (KEEP_READING() && next == C_('0')) {
digit = 1;
NEXT_CHAR(nowread);
}
#endif
/* read digits and convert */
while (KEEP_READING()) {
if (F_(isdigr_)(next, base)) {
if (!ovf) {
digit = 1;
r = r * base + F_(ctorn_)(next, base);
if (r > 0 && pr == r) {
ovf = 1;
} else {
pr = r;
off += sub;
}
}
} else if (next == C_('.')) {
if (dot)
break;
dot = 1, sub = hex ? 4 : 1;
} else
break;
NEXT_CHAR(nowread);
}
if (zero && !digit)
digit = 1;
/* r == 0 should already apply */
if (digit) {
/* exponent? */
if (KEEP_READING() && (next == explc || next == expuc)) {
BOOL eneg = 0;
NEXT_CHAR(nowread);
if (KEEP_READING()) {
switch (next) {
case C_('-'):
eneg = 1;
/* fall-through */
case C_('+'):
NEXT_CHAR(nowread);
}
}
if (!F_(iaton_)(getch, p, &next, &nowread, maxlen, 10,
0, eneg, 0, &exp))
digit = 0;
}
}
if (digit) {
if (dot) {
intmax_t oexp = exp;
exp -= off;
if (exp > oexp) exp = INTMAX_MIN; /* underflow protection */
}
if (r != 0) {
if (exp > 0) {
#ifdef INFINITY
#if FLT_RADIX == 2
if (exp > (hex ? LDBL_MAX_EXP : LDBL_MAX_10_EXP))
#else
/* FLT_RADIX > 2 means LDBL_MAX_EXP is defined as e
in b^e for some b > 2; we'd need to compute
LDBL_MAX_EXP * log(b) / log(2)
at compile time, which is hardly an option.
so instead we'll do the next best thing */
if (exp > (hex ? (LDBL_MAX_EXP * FLT_RADIX + 1)
: LDBL_MAX_10_EXP))
#endif
r = INFINITY;
else
#endif
r *= powi_(hex ? 2 : 10, exp);
} else if (exp < 0) {
#if FLT_RADIX == 2
if (exp < (hex ? LDBL_MIN_EXP : LDBL_MIN_10_EXP))
#else
if (exp < (hex ? (LDBL_MIN_EXP * FLT_RADIX - 1)
: LDBL_MIN_10_EXP))
#endif
r = 0;
else
r /= powi_(hex ? 2 : 10, -exp);
}
}
if (negative) r = -r;
*dest = r;
}
*nextc = next;
*readin = nowread;
return digit;
}
#endif /* !SCANF_DISABLE_SUPPORT_FLOAT */
#ifndef SCANF_REPEAT
enum iscans_type { A_CHAR, A_STRING, A_SCANSET };
#endif /* SCANF_REPEAT */
#if !SCANF_DISABLE_SUPPORT_SCANSET
struct F_(scanset_) {
#if SCANF_CAN_FAST_SCANSET
const BOOL *mask;
#else
const UCHAR *set_begin;
const UCHAR *set_end;
#endif
BOOL invert;
};
#define STRUCT_SCANSET struct F_(scanset_)
static INLINE BOOL F_(insset_)(const struct F_(scanset_) *set, UCHAR c) {
#if SCANF_CAN_FAST_SCANSET
return set->mask[c] != set->invert;
#else
return F_(inscan_)(set->set_begin, set->set_end, c) != set->invert;
#endif
}
#else /* !SCANF_DISABLE_SUPPORT_SCANSET */
#define STRUCT_SCANSET void
#endif /* !SCANF_DISABLE_SUPPORT_SCANSET */
/* read char(s)/string from stream without char conversion
getch: stream read function
p: pointer to pass to above
nextc: pointer to next character in buffer
readin: pointer to number of characters read
maxlen: value that *readin should be at most
ctype: one of the values of iscans_type