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// Copyright 2018 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.
// +build !codeanalysis
package parser
import (
"bufio"
"bytes"
"fmt"
"strings"
"github.com/google/syzkaller/pkg/log"
)
func parseSyscall(scanner *bufio.Scanner) (int, *Syscall) {
lex := newStraceLexer(scanner.Bytes())
ret := StraceParse(lex)
return ret, lex.result
}
func shouldSkip(line string) bool {
return strings.Contains(line, "ERESTART") ||
strings.Contains(line, "+++") ||
strings.Contains(line, "---") ||
strings.Contains(line, "<ptrace(SYSCALL):No such process>")
}
// ParseLoop parses each line of a strace file in a loop.
func ParseData(data []byte) (*TraceTree, error) {
tree := NewTraceTree()
// Creating the process tree
scanner := bufio.NewScanner(bytes.NewReader(data))
scanner.Buffer(nil, 64<<20)
for scanner.Scan() {
line := scanner.Text()
if shouldSkip(line) {
continue
}
log.Logf(4, "scanning call: %s", line)
ret, call := parseSyscall(scanner)
if call == nil || ret != 0 {
return nil, fmt.Errorf("failed to parse line: %v", line)
}
tree.add(call)
}
if err := scanner.Err(); err != nil {
return nil, err
}
if len(tree.TraceMap) == 0 {
return nil, nil
}
return tree, nil
}
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