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tools/openfst-1.6.7/src/lib/util.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// FST utility definitions.
#include <fst/util.h>
#include <cctype>
#include <sstream>
#include <string>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/mapped-file.h>
// Utility flag definitions
DEFINE_bool(fst_error_fatal, true,
"FST errors are fatal; o.w. return objects flagged as bad: "
"e.g., FSTs: kError property set, FST weights: not a Member()");
namespace fst {
void SplitString(char *full, const char *delim, std::vector<char *> *vec,
bool omit_empty_strings) {
char *p = full;
while (p) {
if ((p = strpbrk(full, delim))) {
p[0] = '\0';
}
if (!omit_empty_strings || full[0] != '\0') vec->push_back(full);
if (p) full = p + 1;
}
}
int64 StrToInt64(const string &s, const string &src, size_t nline,
bool allow_negative, bool *error) {
int64 n;
const char *cs = s.c_str();
char *p;
if (error) *error = false;
n = strtoll(cs, &p, 10);
if (p < cs + s.size() || (!allow_negative && n < 0)) {
FSTERROR() << "StrToInt64: Bad integer = " << s << "\", source = " << src
<< ", line = " << nline;
if (error) *error = true;
return 0;
}
return n;
}
void ConvertToLegalCSymbol(string *s) {
for (auto it = s->begin(); it != s->end(); ++it) {
if (!isalnum(*it)) {
*it = '_';
}
}
}
// Skips over input characters to align to 'align' bytes. Returns false if can't
// align.
bool AlignInput(std::istream &strm) {
char c;
for (int i = 0; i < MappedFile::kArchAlignment; ++i) {
int64 pos = strm.tellg();
if (pos < 0) {
LOG(ERROR) << "AlignInput: Can't determine stream position";
return false;
}
if (pos % MappedFile::kArchAlignment == 0) break;
strm.read(&c, 1);
}
return true;
}
// Write null output characters to align to 'align' bytes. Returns false if
// can't align.
bool AlignOutput(std::ostream &strm) {
for (int i = 0; i < MappedFile::kArchAlignment; ++i) {
int64 pos = strm.tellp();
if (pos < 0) {
LOG(ERROR) << "AlignOutput: Can't determine stream position";
return false;
}
if (pos % MappedFile::kArchAlignment == 0) break;
strm.write("", 1);
}
return true;
}
} // namespace fst
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