1// util.cc
2
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14//
15// Copyright 2005-2010 Google, Inc.
16// Author: riley@google.com (Michael Riley)
17//
18// \file
19// FST utility definitions.
20
21#include <cctype>
22#include <string>
23#include <fst/util.h>
24#include <fst/mapped-file.h>
25
26// Utility flag definitions
27
28DEFINE_bool(fst_error_fatal, true,
29            "FST errors are fatal; o.w. return objects flagged as bad: "
30            " e.g., FSTs - kError prop. true, FST weights - not  a Member()");
31
32namespace fst {
33
34int64 StrToInt64(const string &s, const string &src, size_t nline,
35                 bool allow_negative, bool *error) {
36  int64 n;
37  const char *cs = s.c_str();
38  char *p;
39  if (error) *error = false;
40  n = strtoll(cs, &p, 10);
41  if (p < cs + s.size() || (!allow_negative && n < 0)) {
42    FSTERROR() << "StrToInt64: Bad integer = " << s
43               << "\", source = " << src << ", line = " << nline;
44    if (error) *error = true;
45    return 0;
46  }
47  return n;
48}
49
50void Int64ToStr(int64 n, string *s) {
51  ostringstream nstr;
52  nstr << n;
53  s->append(nstr.str().data(), nstr.str().size());
54}
55
56void ConvertToLegalCSymbol(string *s) {
57  for (string::iterator it = s->begin(); it != s->end(); ++it)
58    if (!isalnum(*it)) *it = '_';
59}
60
61// Skips over input characters to align to 'align' bytes. Returns
62// false if can't align.
63bool AlignInput(istream &strm) {
64  char c;
65  for (int i = 0; i < MappedFile::kArchAlignment; ++i) {
66    int64 pos = strm.tellg();
67    if (pos < 0) {
68      LOG(ERROR) << "AlignInput: can't determine stream position";
69      return false;
70    }
71    if (pos % MappedFile::kArchAlignment == 0) break;
72    strm.read(&c, 1);
73  }
74  return true;
75}
76
77// Write null output characters to align to 'align' bytes. Returns
78// false if can't align.
79bool AlignOutput(ostream &strm) {
80  for (int i = 0; i < MappedFile::kArchAlignment; ++i) {
81    int64 pos = strm.tellp();
82    if (pos < 0) {
83      LOG(ERROR) << "AlignOutput: can't determine stream position";
84      return false;
85    }
86    if (pos % MappedFile::kArchAlignment == 0) break;
87    strm.write("", 1);
88  }
89  return true;
90}
91
92
93}  // namespace fst
94