/thirdparty/breakpad/third_party/protobuf/protobuf/src/google/protobuf/stubs/substitute.cc

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 30
 31// Author: kenton@google.com (Kenton Varda)
 32
 33#include <google/protobuf/stubs/substitute.h>
 34#include <google/protobuf/stubs/strutil.h>
 35#include <google/protobuf/stubs/stl_util-inl.h>
 36
 37namespace google {
 38namespace protobuf {
 39namespace strings {
 40
 41using internal::SubstituteArg;
 42
 43// Returns the number of args in arg_array which were passed explicitly
 44// to Substitute().
 45static int CountSubstituteArgs(const SubstituteArg* const* args_array) {
 46  int count = 0;
 47  while (args_array[count] != NULL && args_array[count]->size() != -1) {
 48    ++count;
 49  }
 50  return count;
 51}
 52
 53string Substitute(
 54    const char* format,
 55    const SubstituteArg& arg0, const SubstituteArg& arg1,
 56    const SubstituteArg& arg2, const SubstituteArg& arg3,
 57    const SubstituteArg& arg4, const SubstituteArg& arg5,
 58    const SubstituteArg& arg6, const SubstituteArg& arg7,
 59    const SubstituteArg& arg8, const SubstituteArg& arg9) {
 60  string result;
 61  SubstituteAndAppend(&result, format, arg0, arg1, arg2, arg3, arg4,
 62                                       arg5, arg6, arg7, arg8, arg9);
 63  return result;
 64}
 65
 66void SubstituteAndAppend(
 67    string* output, const char* format,
 68    const SubstituteArg& arg0, const SubstituteArg& arg1,
 69    const SubstituteArg& arg2, const SubstituteArg& arg3,
 70    const SubstituteArg& arg4, const SubstituteArg& arg5,
 71    const SubstituteArg& arg6, const SubstituteArg& arg7,
 72    const SubstituteArg& arg8, const SubstituteArg& arg9) {
 73  const SubstituteArg* const args_array[] = {
 74    &arg0, &arg1, &arg2, &arg3, &arg4, &arg5, &arg6, &arg7, &arg8, &arg9, NULL
 75  };
 76
 77  // Determine total size needed.
 78  int size = 0;
 79  for (int i = 0; format[i] != '\0'; i++) {
 80    if (format[i] == '$') {
 81      if (ascii_isdigit(format[i+1])) {
 82        int index = format[i+1] - '0';
 83        if (args_array[index]->size() == -1) {
 84          GOOGLE_LOG(DFATAL)
 85            << "strings::Substitute format string invalid: asked for \"$"
 86            << index << "\", but only " << CountSubstituteArgs(args_array)
 87            << " args were given.  Full format string was: \""
 88            << CEscape(format) << "\".";
 89          return;
 90        }
 91        size += args_array[index]->size();
 92        ++i;  // Skip next char.
 93      } else if (format[i+1] == '$') {
 94        ++size;
 95        ++i;  // Skip next char.
 96      } else {
 97        GOOGLE_LOG(DFATAL)
 98          << "Invalid strings::Substitute() format string: \""
 99          << CEscape(format) << "\".";
100        return;
101      }
102    } else {
103      ++size;
104    }
105  }
106
107  if (size == 0) return;
108
109  // Build the string.
110  int original_size = output->size();
111  STLStringResizeUninitialized(output, original_size + size);
112  char* target = string_as_array(output) + original_size;
113  for (int i = 0; format[i] != '\0'; i++) {
114    if (format[i] == '$') {
115      if (ascii_isdigit(format[i+1])) {
116        const SubstituteArg* src = args_array[format[i+1] - '0'];
117        memcpy(target, src->data(), src->size());
118        target += src->size();
119        ++i;  // Skip next char.
120      } else if (format[i+1] == '$') {
121        *target++ = '$';
122        ++i;  // Skip next char.
123      }
124    } else {
125      *target++ = format[i];
126    }
127  }
128
129  GOOGLE_DCHECK_EQ(target - output->data(), output->size());
130}
131
132}  // namespace strings
133}  // namespace protobuf
134}  // namespace google