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#include "tar.h"
// only first hard link
// checksum positive and negative bytes
int write_file(int fd, char *file_name)
{
struct stat statbuf;
t_header header;
stat(file_name, &statbuf);
bzero(&header, sizeof(t_header));
strncpy(header.file_name, file_name, sizeof(header.file_name));
sprintf(header.file_mode, "%07o", statbuf.st_mode & 0777);
sprintf(header.user_id, "%07o", statbuf.st_uid);
sprintf(header.group_id, "%07o", statbuf.st_gid);
sprintf(header.file_size, "%011lo", statbuf.st_size);
sprintf(header.last_time, "%011lo", statbuf.st_mtime);
memset(header.checksum, ' ', sizeof(header.checksum));
header.file_type[0] = '0';
/* strncpy(header.ustar, "ustar", sizeof(header.ustar)); */
char *header_ptr = (char*)&header;
unsigned int sum = 0;
for (size_t i = 0; i < sizeof(t_header); i++)
sum += header_ptr[i];
sprintf(header.checksum, "%06o", sum);
char buf[512] = {0};
memcpy(buf, &header, sizeof(t_header));
write(fd, buf, 512);
int from;
char *content;
switch (statbuf.st_mode & S_IFMT)
{
case S_IFDIR: break;
default:
from = open(file_name, O_RDONLY);
content = calloc(statbuf.st_size + 1, sizeof(char));
read(from, content, statbuf.st_size);
write(fd, content, statbuf.st_size);
free(content);
close(from);
memset(buf, '\0', 512);
write(fd, buf, 512 - statbuf.st_size % 512);
}
// if dir
// write_dir
// else
// write content
return (0);
}
int write_directory(int fd, char *dirname)
{
// for f in files
// write_file
}
int main(int argc, char **argv)
{
int opt;
char *output_file_name = NULL;
while ((opt = getopt(argc, argv, "cvtf:")) != -1)
{
switch (opt)
{
case 'c':
break;
case 'f':
output_file_name = optarg;
break;
case 'v':
break;
case 't':
break;
default:
return 1;
}
}
int fd = -1;
if (output_file_name == NULL)
fd = STDOUT_FILENO;
else
{
fd = open(output_file_name, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1)
{
perror(NULL);
return 1;
}
}
/* printf("out: %s\n", output_file_name); */
char **files = argv + optind;
for (; *files != NULL; files++)
{
/* printf("%s\n", *files); */
write_file(fd, *files);
}
char buf[512] = {'\0'};
write(fd, buf, 512);
write(fd, buf, 512);
if (fd != STDOUT_FILENO)
close(fd);
return 0;
}
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