68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
#include <cstddef>
|
|
#include <ostream>
|
|
#include <string>
|
|
#include <iostream>
|
|
#include <fstream>
|
|
#include <cstring>
|
|
|
|
static int get_text(const char *path, std::string &text)
|
|
{
|
|
std::ifstream file(path);
|
|
|
|
if (!file.is_open())
|
|
{
|
|
std::cerr << "sed: file error" << std::endl;
|
|
return (1);
|
|
}
|
|
std::getline(file, text, '\0');
|
|
file.close();
|
|
return (0);
|
|
}
|
|
|
|
static std::string replace_text(const char *text, const char *text_to_replace, const std::string &replacement_text)
|
|
{
|
|
size_t i;
|
|
size_t len;
|
|
std::string out;
|
|
|
|
len = std::strlen(text_to_replace);
|
|
i = 0;
|
|
while (text[i] != '\0')
|
|
{
|
|
if (len != 0 && std::strncmp(text + i, text_to_replace, len) == 0)
|
|
{
|
|
out += replacement_text;
|
|
i += len;
|
|
}
|
|
else
|
|
{
|
|
out += text[i];
|
|
i++;
|
|
}
|
|
}
|
|
return (out);
|
|
}
|
|
|
|
int main(int ac, char **av)
|
|
{
|
|
std::string text;
|
|
std::string replaced;
|
|
|
|
if (!(ac >= 4))
|
|
{
|
|
std::cerr << "Sed: missing argument" << std::endl
|
|
<< "syntax: ./sed file text_to_replace replacement_text" << std::endl;
|
|
return (1);
|
|
}
|
|
if (get_text(av[1], text))
|
|
return (2);
|
|
replaced = replace_text(text.c_str(), av[2], av[3]);
|
|
std::ofstream file((std::string(av[1]) + std::string(".replace")).c_str());
|
|
if (!file.is_open())
|
|
{
|
|
std::cerr << "sed: file error" << std::endl;
|
|
return (1);
|
|
}
|
|
file << replaced << std::endl;
|
|
}
|