banan-os/userspace/cp/main.cpp

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#include <BAN/String.h>
#include <BAN/Vector.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#define STR_STARTS_WITH(str, arg) (strncmp(str, arg, sizeof(arg) - 1) == 0)
#define STR_EQUAL(str, arg) (strcmp(str, arg) == 0)
bool copy_file(const BAN::String& source, BAN::String destination)
{
struct stat st;
if (stat(source.data(), &st) == -1)
{
fprintf(stderr, "%s: ", source.data());
perror("stat");
return false;
}
if (!S_ISREG(st.st_mode))
{
fprintf(stderr, "%s: not a directory\n", source.data());
return false;
}
if (stat(destination.data(), &st) != -1 && S_ISDIR(st.st_mode))
{
MUST(destination.push_back('/'));
MUST(destination.append(MUST(source.sv().split('/')).back()));
}
int src_fd = open(source.data(), O_RDONLY);
if (src_fd == -1)
{
fprintf(stderr, "%s: ", source.data());
perror("open");
return false;
}
int dest_fd = open(destination.data(), O_CREAT | O_TRUNC | O_WRONLY, 0644);
if (dest_fd == -1)
{
fprintf(stderr, "%s: ", destination.data());
perror("open");
close(src_fd);
return false;
}
bool ret = true;
char buffer[1024];
while (ssize_t nread = read(src_fd, buffer, sizeof(buffer)))
{
if (nread < 0)
{
fprintf(stderr, "%s: ", source.data());
perror("read");
ret = false;
break;
}
size_t written = 0;
while (written < nread)
{
ssize_t nwrite = write(dest_fd, buffer, nread - written);
if (nwrite < 0)
{
fprintf(stderr, "%s: ", destination.data());
perror("write");
ret = false;
}
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if (nwrite <= 0)
break;
written += nwrite;
}
if (written < nread)
break;
}
close(src_fd);
close(dest_fd);
return ret;
}
bool copy_file_to_directory(const BAN::String& source, const BAN::String& destination)
{
auto temp = destination;
MUST(temp.append(MUST(source.sv().split('/')).back()));
return copy_file(source, destination);
}
void usage(const char* argv0, int ret)
{
FILE* out = (ret == 0) ? stdout : stderr;
fprintf(out, "usage: %s [OPTIONS]... SOURCE... DEST\n", argv0);
fprintf(out, "Copies files SOURCE... to DEST\n");
fprintf(out, "OPTIONS:\n");
fprintf(out, " -h, --help\n");
fprintf(out, " Show this message and exit\n");
exit(ret);
}
int main(int argc, char** argv)
{
BAN::Vector<BAN::StringView> src;
BAN::StringView dest;
int i = 1;
for (; i < argc; i++)
{
if (STR_EQUAL(argv[i], "-h") || STR_EQUAL(argv[i], "--help"))
{
usage(argv[0], 0);
}
else if (argv[i][0] == '-')
{
fprintf(stderr, "Unknown argument %s\n", argv[i]);
usage(argv[0], 1);
}
else
{
break;
}
}
for (; i < argc - 1; i++)
MUST(src.push_back(argv[i]));
dest = argv[argc - 1];
if (src.empty())
{
fprintf(stderr, "Missing destination operand\n");
usage(argv[0], 1);
}
int ret = 0;
for (auto file_path : src)
if (!copy_file(file_path, dest))
ret = 1;
return ret;
}