diff options
Diffstat (limited to 'vendor/modernc.org/libc/scanf.go')
| -rw-r--r-- | vendor/modernc.org/libc/scanf.go | 198 |
1 files changed, 192 insertions, 6 deletions
diff --git a/vendor/modernc.org/libc/scanf.go b/vendor/modernc.org/libc/scanf.go index ead0830e8..cc35da358 100644 --- a/vendor/modernc.org/libc/scanf.go +++ b/vendor/modernc.org/libc/scanf.go @@ -5,7 +5,8 @@ package libc // import "modernc.org/libc" import ( - "strings" + "io" + "strconv" "unsafe" ) @@ -15,7 +16,7 @@ import ( // 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) { +func scanf(r io.ByteScanner, format, args uintptr) (nvalues int32) { // var src []byte //TODO- var ok bool out: @@ -75,7 +76,7 @@ out: return -1 // stdio.EOF but not defined for windows } -func scanfConversion(r *strings.Reader, format uintptr, args *uintptr) (_ uintptr, nvalues int, match bool) { +func scanfConversion(r io.ByteScanner, format uintptr, args *uintptr) (_ uintptr, nvalues int, match bool) { format++ // '%' // Each conversion specification in format begins with either the character '%' @@ -157,7 +158,7 @@ flags: break dec } - panic(todo("", err)) + return 0, 0, false } if allowSign { @@ -301,7 +302,38 @@ flags: // Matches an optionally signed floating-point number; the next pointer must be // a pointer to float. format++ - panic(todo("")) + skipReaderWhiteSpace(r) + seq := fpLiteral(r) + if len(seq) == 0 { + return 0, 0, false + } + + var neg bool + switch seq[0] { + case '+': + seq = seq[1:] + case '-': + neg = true + seq = seq[1:] + } + n, err := strconv.ParseFloat(string(seq), 64) + if err != nil { + panic(todo("", err)) + } + + arg := VaUintptr(args) + if neg { + n = -n + } + switch mod { + case modNone: + *(*float32)(unsafe.Pointer(arg)) = float32(n) + case modL: + *(*float64)(unsafe.Pointer(arg)) = n + default: + panic(todo("", mod, neg, n)) + } + return format, 1, true 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 @@ -414,7 +446,7 @@ flags: return format, nvalues, match } -func skipReaderWhiteSpace(r *strings.Reader) error { +func skipReaderWhiteSpace(r io.ByteScanner) error { for { c, err := r.ReadByte() if err != nil { @@ -441,3 +473,157 @@ func skipWhiteSpace(s uintptr) uintptr { } } } + +// [-+]?([0-9]*[.])?[0-9]+([eE][-+]?\d+)? +func fpLiteral(rd io.ByteScanner) (seq []byte) { + const endOfText = 0x110000 + var pos, width, length int + + defer func() { + if len(seq) > length { + rd.UnreadByte() + seq = seq[:len(seq)-1] + } + }() + + var r rune + step := func(pos int) (rune, int) { + b, err := rd.ReadByte() + if err != nil { + return endOfText, 0 + } + + seq = append(seq, b) + return rune(b), 1 + } + move := func() { + pos += width + if r != endOfText { + r, width = step(pos + width) + } + } + accept := func(x rune) bool { + if r == x { + move() + return true + } + return false + } + accept2 := func(x rune) bool { + if r <= x { + move() + return true + } + return false + } + r = endOfText + width = 0 + r, width = step(pos) + if accept('.') { + goto l7 + } + if accept('+') { + goto l30 + } + if accept('-') { + goto l30 + } + if r < '0' { + goto l4out + } + if accept2('9') { + goto l35 + } +l4out: + return seq +l7: + if r < '0' { + goto l7out + } + if accept2('9') { + goto l10 + } +l7out: + return seq +l10: + length = pos + if accept('E') { + goto l18 + } + if accept('e') { + goto l18 + } + if r < '0' { + goto l15out + } + if accept2('9') { + goto l10 + } +l15out: + return seq +l18: + if accept('+') { + goto l23 + } + if accept('-') { + goto l23 + } + if r < '0' { + goto l20out + } + if accept2('9') { + goto l26 + } +l20out: + return seq +l23: + if r < '0' { + goto l23out + } + if accept2('9') { + goto l26 + } +l23out: + return seq +l26: + length = pos + if r < '0' { + goto l27out + } + if accept2('9') { + goto l26 + } +l27out: + return seq +l30: + if accept('.') { + goto l7 + } + if r < '0' { + goto l32out + } + if accept2('9') { + goto l35 + } +l32out: + return seq +l35: + length = pos + if accept('.') { + goto l7 + } + if accept('E') { + goto l18 + } + if accept('e') { + goto l18 + } + if r < '0' { + goto l42out + } + if accept2('9') { + goto l35 + } +l42out: + return seq +} |