How to replace special quotes with straight quotes C++ - c++

Question

For example the file I am parsing contains unicode char u201d ie. ” (accented quote)
How do I replace it with " (Straight quote)?

Answer 1

using c++ and STL i would use a code like this, you still need to save to output buffer to file.. tested on linux.
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
// load file data
char* load_file(const char *filename)
{
FILE *fp;
fp = fopen(filename, "r");
if (!fp)
return NULL;
size_t size;
if ((0 != fseek(fp, 0, SEEK_END)) || (-1 == (size = ftell(fp))))
size = 0;
// set fp at file start
fseek(fp, 0, 0);
char *buffer;
buffer = (char*) malloc(size);
if(!buffer)
{
fclose (fp);
return NULL;
}
if(size != fread(buffer, 1, size, fp))
{
free (buffer);
buffer = NULL;
}
fclose (fp);
return buffer;
}
// replace string
std::string replace(const std::string& str, const std::string& from, const std::string& to)
{
if(str.size() < 1)
return str;
std::string temp_str(str);
size_t start_pos = 0;
while((start_pos = temp_str.find(from, start_pos)) != std::string::npos)
{
temp_str.replace(start_pos, from.length(), to);
start_pos += to.length();
}
return temp_str.c_str();
}
int main(int argc, char** argv)
{
const char* file_name = "test.txt";
char* file_bytes = load_file(file_name);
if(file_bytes == nullptr)
return EXIT_FAILURE;
std::cout << replace(file_bytes, "”", "\"") << std::endl;
return EXIT_SUCCESS;
}