mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-25 00:41:37 +00:00
6a3fc71397
* Update dependencies and go1.18 * Exclude unnecessary linters and update build to go1.18
444 lines
11 KiB
Go
444 lines
11 KiB
Go
// Copyright 2020 The Libc Authors. All rights reserved.
|
||
// Use of this source code is governed by a BSD-style
|
||
// license that can be found in the LICENSE file.
|
||
|
||
package libc // import "modernc.org/libc"
|
||
|
||
import (
|
||
"strings"
|
||
"unsafe"
|
||
)
|
||
|
||
// The format string consists of a sequence of directives which describe how to
|
||
// process the sequence of input characters. If processing of a directive
|
||
// fails, no further input is read, and scanf() returns. A "failure" can
|
||
// be either of the following: input failure, meaning that input characters
|
||
// were unavailable, or matching failure, meaning that the input was
|
||
// inappropriate.
|
||
func scanf(r *strings.Reader, format, args uintptr) (nvalues int32) {
|
||
// var src []byte //TODO-
|
||
var ok bool
|
||
out:
|
||
for {
|
||
c := *(*byte)(unsafe.Pointer(format))
|
||
// src = append(src, c) //TODO-
|
||
switch c {
|
||
case '%':
|
||
var n int
|
||
var match bool
|
||
format, n, match = scanfConversion(r, format, &args)
|
||
if !match {
|
||
break out
|
||
}
|
||
|
||
nvalues += int32(n)
|
||
ok = true
|
||
case 0:
|
||
break out
|
||
case ' ', '\t', '\n', '\r', '\v', '\f':
|
||
format = skipWhiteSpace(format)
|
||
ok = true
|
||
next:
|
||
for {
|
||
c, err := r.ReadByte()
|
||
if err != nil {
|
||
break out
|
||
}
|
||
|
||
switch c {
|
||
case ' ', '\t', '\n', '\r', '\v', '\f':
|
||
// nop
|
||
default:
|
||
r.UnreadByte()
|
||
break next
|
||
}
|
||
}
|
||
default:
|
||
c2, err := r.ReadByte()
|
||
if err != nil {
|
||
break out
|
||
}
|
||
|
||
if c2 != c {
|
||
r.UnreadByte()
|
||
break out
|
||
}
|
||
|
||
format++
|
||
ok = true
|
||
}
|
||
}
|
||
if ok {
|
||
return nvalues
|
||
}
|
||
|
||
return -1 // stdio.EOF but not defined for windows
|
||
}
|
||
|
||
func scanfConversion(r *strings.Reader, format uintptr, args *uintptr) (_ uintptr, nvalues int, match bool) {
|
||
format++ // '%'
|
||
|
||
// Each conversion specification in format begins with either the character '%'
|
||
// or the character sequence "%n$" (see below for the distinction) followed by:
|
||
|
||
mod := 0
|
||
width := -1
|
||
flags:
|
||
for {
|
||
switch c := *(*byte)(unsafe.Pointer(format)); c {
|
||
case '*':
|
||
// An optional '*' assignment-suppression character: scanf() reads input as
|
||
// directed by the conversion specification, but discards the input. No
|
||
// corresponding pointer argument is re‐ quired, and this specification is not
|
||
// included in the count of successful assignments returned by scanf().
|
||
format++
|
||
panic(todo(""))
|
||
case '\'':
|
||
// For decimal conversions, an optional quote character ('). This specifies
|
||
// that the input number may include thousands' separators as defined by the
|
||
// LC_NUMERIC category of the current locale. (See setlocale(3).) The quote
|
||
// character may precede or follow the '*' assignment-suppression character.
|
||
format++
|
||
panic(todo(""))
|
||
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
||
// An optional decimal integer which specifies the maximum field width.
|
||
// Reading of characters stops either when this maximum is reached or when a
|
||
// nonmatching character is found, whichever happens first. Most conversions
|
||
// discard initial white space characters (the exceptions are noted below), and
|
||
// these discarded characters don't count toward the maximum field width.
|
||
// String input conversions store a terminating null byte ('\0') to mark the
|
||
// end of the input; the maximum field width does not include this terminator.
|
||
width = 0
|
||
num:
|
||
for {
|
||
var digit int
|
||
switch c := *(*byte)(unsafe.Pointer(format)); {
|
||
default:
|
||
break num
|
||
case c >= '0' && c <= '9':
|
||
format++
|
||
digit = int(c) - '0'
|
||
}
|
||
width0 := width
|
||
width = 10*width + digit
|
||
if width < width0 {
|
||
panic(todo(""))
|
||
}
|
||
}
|
||
case 'h', 'j', 'l', 'L', 'q', 't', 'z':
|
||
format, mod = parseLengthModifier(format)
|
||
default:
|
||
break flags
|
||
}
|
||
}
|
||
|
||
// A conversion specifier that specifies the type of input conversion to be
|
||
// performed.
|
||
switch c := *(*byte)(unsafe.Pointer(format)); c {
|
||
case '%':
|
||
// Matches a literal '%'. That is, %% in the format string matches a single
|
||
// input '%' character. No conversion is done (but initial white space
|
||
// characters are discarded), and assign‐ ment does not occur.
|
||
format++
|
||
panic(todo(""))
|
||
case 'd':
|
||
// Matches an optionally signed decimal integer; the next pointer must be a
|
||
// pointer to int.
|
||
format++
|
||
skipReaderWhiteSpace(r)
|
||
var digit, n uint64
|
||
allowSign := true
|
||
neg := false
|
||
dec:
|
||
for ; width != 0; width-- {
|
||
c, err := r.ReadByte()
|
||
if err != nil {
|
||
if match {
|
||
break dec
|
||
}
|
||
|
||
panic(todo("", err))
|
||
}
|
||
|
||
if allowSign {
|
||
switch c {
|
||
case '-':
|
||
allowSign = false
|
||
neg = true
|
||
continue
|
||
case '+':
|
||
allowSign = false
|
||
continue
|
||
}
|
||
}
|
||
|
||
switch {
|
||
case c >= '0' && c <= '9':
|
||
digit = uint64(c) - '0'
|
||
default:
|
||
r.UnreadByte()
|
||
break dec
|
||
}
|
||
match = true
|
||
n0 := n
|
||
n = n*10 + digit
|
||
if n < n0 {
|
||
panic(todo(""))
|
||
}
|
||
}
|
||
if !match {
|
||
break
|
||
}
|
||
|
||
arg := VaUintptr(args)
|
||
v := int64(n)
|
||
if neg {
|
||
v = -v
|
||
}
|
||
switch mod {
|
||
case modNone:
|
||
*(*int32)(unsafe.Pointer(arg)) = int32(v)
|
||
case modH:
|
||
*(*int16)(unsafe.Pointer(arg)) = int16(v)
|
||
case modHH:
|
||
*(*int8)(unsafe.Pointer(arg)) = int8(v)
|
||
case modL:
|
||
*(*long)(unsafe.Pointer(arg)) = long(n)
|
||
default:
|
||
panic(todo(""))
|
||
}
|
||
nvalues = 1
|
||
case 'D':
|
||
// Equivalent to ld; this exists only for backward compatibility. (Note:
|
||
// thus only in libc4. In libc5 and glibc the %D is silently ignored, causing
|
||
// old programs to fail mysteriously.)
|
||
format++
|
||
panic(todo(""))
|
||
case 'i':
|
||
// Matches an optionally signed integer; the next pointer must be a pointer to
|
||
// int. The integer is read in base 16 if it begins with 0x or 0X, in base 8
|
||
// if it begins with 0, and in base 10 otherwise. Only characters that
|
||
// correspond to the base are used.
|
||
format++
|
||
panic(todo(""))
|
||
case 'o':
|
||
// Matches an unsigned octal integer; the next pointer must be a pointer to
|
||
// unsigned int.
|
||
format++
|
||
panic(todo(""))
|
||
case 'u':
|
||
// Matches an unsigned decimal integer; the next pointer must be a pointer to
|
||
// unsigned int.
|
||
format++
|
||
panic(todo(""))
|
||
case 'x', 'X':
|
||
// Matches an unsigned hexadecimal integer; the next pointer must be a pointer
|
||
// to unsigned int.
|
||
format++
|
||
skipReaderWhiteSpace(r)
|
||
var digit, n uint64
|
||
allowPrefix := true
|
||
var b []byte
|
||
hex:
|
||
for ; width != 0; width-- {
|
||
c, err := r.ReadByte()
|
||
if err != nil {
|
||
if match {
|
||
break hex
|
||
}
|
||
|
||
panic(todo("", err))
|
||
}
|
||
|
||
if allowPrefix {
|
||
if len(b) == 1 && b[0] == '0' && (c == 'x' || c == 'X') {
|
||
allowPrefix = false
|
||
match = false
|
||
b = nil
|
||
continue
|
||
}
|
||
|
||
b = append(b, c)
|
||
}
|
||
|
||
switch {
|
||
case c >= '0' && c <= '9':
|
||
digit = uint64(c) - '0'
|
||
case c >= 'a' && c <= 'f':
|
||
digit = uint64(c) - 'a' + 10
|
||
case c >= 'A' && c <= 'F':
|
||
digit = uint64(c) - 'A' + 10
|
||
default:
|
||
r.UnreadByte()
|
||
break hex
|
||
}
|
||
match = true
|
||
n0 := n
|
||
n = n<<4 + digit
|
||
if n < n0 {
|
||
panic(todo(""))
|
||
}
|
||
}
|
||
if !match {
|
||
break
|
||
}
|
||
|
||
arg := VaUintptr(args)
|
||
switch mod {
|
||
case modNone:
|
||
*(*uint32)(unsafe.Pointer(arg)) = uint32(n)
|
||
case modH:
|
||
*(*uint16)(unsafe.Pointer(arg)) = uint16(n)
|
||
case modHH:
|
||
*(*byte)(unsafe.Pointer(arg)) = byte(n)
|
||
case modL:
|
||
*(*ulong)(unsafe.Pointer(arg)) = ulong(n)
|
||
default:
|
||
panic(todo(""))
|
||
}
|
||
nvalues = 1
|
||
case 'f', 'e', 'g', 'E', 'a':
|
||
// Matches an optionally signed floating-point number; the next pointer must be
|
||
// a pointer to float.
|
||
format++
|
||
panic(todo(""))
|
||
case 's':
|
||
// Matches a sequence of non-white-space characters; the next pointer must be
|
||
// a pointer to the initial element of a character array that is long enough to
|
||
// hold the input sequence and the terminating null byte ('\0'), which is added
|
||
// automatically. The input string stops at white space or at the maximum
|
||
// field width, whichever occurs first.
|
||
format++
|
||
panic(todo(""))
|
||
case 'c':
|
||
// Matches a sequence of characters whose length is specified by the maximum
|
||
// field width (default 1); the next pointer must be a pointer to char, and
|
||
// there must be enough room for all the characters (no terminating null byte
|
||
// is added). The usual skip of leading white space is suppressed. To skip
|
||
// white space first, use an explicit space in the format.
|
||
format++
|
||
panic(todo(""))
|
||
case '[':
|
||
// Matches a nonempty sequence of characters from the specified set of
|
||
// accepted characters; the next pointer must be a pointer to char, and there
|
||
// must be enough room for all the char‐ acters in the string, plus a
|
||
// terminating null byte. The usual skip of leading white space is suppressed.
|
||
// The string is to be made up of characters in (or not in) a particular set;
|
||
// the set is defined by the characters between the open bracket [ character
|
||
// and a close bracket ] character. The set excludes those characters if the
|
||
// first character after the open bracket is a circumflex (^). To include a
|
||
// close bracket in the set, make it the first character after the open bracket
|
||
// or the circumflex; any other position will end the set. The hyphen
|
||
// character - is also special; when placed between two other characters, it
|
||
// adds all intervening characters to the set. To include a hyphen, make it
|
||
// the last character before the final close bracket. For instance, [^]0-9-]
|
||
// means the set "everything except close bracket, zero through nine, and
|
||
// hyphen". The string ends with the appearance of a character not in the
|
||
// (or, with a circumflex, in) set or when the field width runs out.
|
||
format++
|
||
panic(todo(""))
|
||
case 'p':
|
||
// Matches a pointer value (as printed by %p in printf(3); the next pointer
|
||
// must be a pointer to a pointer to void.
|
||
format++
|
||
skipReaderWhiteSpace(r)
|
||
c, err := r.ReadByte()
|
||
if err != nil {
|
||
panic(todo(""))
|
||
}
|
||
|
||
if c != '0' {
|
||
r.UnreadByte()
|
||
panic(todo(""))
|
||
}
|
||
|
||
if c, err = r.ReadByte(); err != nil {
|
||
panic(todo(""))
|
||
}
|
||
|
||
if c != 'x' && c != 'X' {
|
||
r.UnreadByte()
|
||
panic(todo(""))
|
||
}
|
||
|
||
var digit, n uint64
|
||
ptr:
|
||
for ; width != 0; width-- {
|
||
c, err := r.ReadByte()
|
||
if err != nil {
|
||
if match {
|
||
break ptr
|
||
}
|
||
|
||
panic(todo(""))
|
||
}
|
||
|
||
switch {
|
||
case c >= '0' && c <= '9':
|
||
digit = uint64(c) - '0'
|
||
case c >= 'a' && c <= 'f':
|
||
digit = uint64(c) - 'a' + 10
|
||
case c >= 'A' && c <= 'F':
|
||
digit = uint64(c) - 'A' + 10
|
||
default:
|
||
r.UnreadByte()
|
||
break ptr
|
||
}
|
||
match = true
|
||
n0 := n
|
||
n = n<<4 + digit
|
||
if n < n0 {
|
||
panic(todo(""))
|
||
}
|
||
}
|
||
if !match {
|
||
break
|
||
}
|
||
|
||
arg := VaUintptr(args)
|
||
*(*uintptr)(unsafe.Pointer(arg)) = uintptr(n)
|
||
nvalues = 1
|
||
case 'n':
|
||
// Nothing is expected; instead, the number of characters consumed thus far
|
||
// from the input is stored through the next pointer, which must be a pointer
|
||
// to int. This is not a conversion and does not increase the count returned
|
||
// by the function. The assignment can be suppressed with the *
|
||
// assignment-suppression character, but the effect on the return value is
|
||
// undefined. Therefore %*n conversions should not be used.
|
||
format++
|
||
panic(todo(""))
|
||
default:
|
||
panic(todo("%#U", c))
|
||
}
|
||
|
||
return format, nvalues, match
|
||
}
|
||
|
||
func skipReaderWhiteSpace(r *strings.Reader) error {
|
||
for {
|
||
c, err := r.ReadByte()
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
switch c {
|
||
case ' ', '\t', '\n', '\r', '\v', '\f':
|
||
// ok
|
||
default:
|
||
r.UnreadByte()
|
||
return nil
|
||
}
|
||
}
|
||
}
|
||
|
||
func skipWhiteSpace(s uintptr) uintptr {
|
||
for {
|
||
switch c := *(*byte)(unsafe.Pointer(s)); c {
|
||
case ' ', '\t', '\n', '\r', '\v', '\f':
|
||
s++
|
||
default:
|
||
return s
|
||
}
|
||
}
|
||
}
|