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// Copyright 2015/2016 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package sysparser
import (
"bufio"
"fmt"
"io"
"os"
)
type parser struct {
r *bufio.Scanner
s string
i int
l int
}
func newParser(r io.Reader) *parser {
return &parser{r: bufio.NewScanner(r)}
}
func (p *parser) Scan() bool {
if !p.r.Scan() {
if err := p.r.Err(); err != nil {
failf("failed to read input file: %v", err)
}
return false
}
p.s = p.r.Text()
p.i = 0
p.l++
return true
}
func (p *parser) Str() string {
return p.s
}
func (p *parser) EOF() bool {
return p.i == len(p.s)
}
func (p *parser) Char() byte {
if p.EOF() {
p.failf("unexpected eof")
}
return p.s[p.i]
}
func (p *parser) Parse(ch byte) {
if p.EOF() {
p.failf("want %s, got EOF", string(ch))
}
if p.s[p.i] != ch {
p.failf("want '%v', got '%v'", string(ch), string(p.s[p.i]))
}
p.i++
p.SkipWs()
}
func (p *parser) SkipWs() {
for p.i < len(p.s) && (p.s[p.i] == ' ' || p.s[p.i] == '\t') {
p.i++
}
}
func (p *parser) Ident() string {
start, end := p.i, 0
if p.Char() == '"' {
p.Parse('"')
start++
for p.Char() != '"' {
p.i++
}
end = p.i
p.Parse('"')
} else {
for p.i < len(p.s) &&
(p.s[p.i] >= 'a' && p.s[p.i] <= 'z' ||
p.s[p.i] >= 'A' && p.s[p.i] <= 'Z' ||
p.s[p.i] >= '0' && p.s[p.i] <= '9' ||
p.s[p.i] == '_' || p.s[p.i] == '$' || // $ is for n-way syscalls (like ptrace$peek)
p.s[p.i] == '-' || p.s[p.i] == ':') { // : is for ranged int (like int32[-3:10])
p.i++
}
if start == p.i {
p.failf("failed to parse identifier at pos %v", start)
}
end = p.i
}
s := p.s[start:end]
p.SkipWs()
return s
}
func (p *parser) failf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, "line #%v: %v\n", p.l, p.s)
failf(msg, args...)
}
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