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      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 (at) 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 
     28 DEFINE_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 
     32 namespace fst {
     33 
     34 int64 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 
     50 void Int64ToStr(int64 n, string *s) {
     51   ostringstream nstr;
     52   nstr << n;
     53   s->append(nstr.str().data(), nstr.str().size());
     54 }
     55 
     56 void 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.
     63 bool 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.
     79 bool 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