From 0fa3308034c7776b6c078e493f3b758f0a0bf7e6 Mon Sep 17 00:00:00 2001 From: Charles Date: Sat, 20 Jun 2020 17:17:36 +0200 Subject: Added recursion for directory, not complete ustar format --- src/header.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 78 insertions(+), 1 deletion(-) (limited to 'src/header.c') diff --git a/src/header.c b/src/header.c index a0cf2fb..133a895 100644 --- a/src/header.c +++ b/src/header.c @@ -1,3 +1,80 @@ #include "tar.h" -/* int header_write(int fd, */ +int record_write(int fd, char *s, size_t size) +{ + char buf[RECORD_SIZE]; + + while (size > RECORD_SIZE) + { + memcpy(buf, s, RECORD_SIZE); + s += RECORD_SIZE; + size -= RECORD_SIZE; + if (write(fd, buf, RECORD_SIZE) == -1) + { + perror(NULL); + return -1; + } + } + bzero(buf, RECORD_SIZE); + memcpy(buf, s, size); + if (write(fd, buf, RECORD_SIZE) == -1) + { + perror(NULL); + return -1; + } + return (0); +} + +int header_write(int fd, char *file_name, struct stat *statbuf) +{ + t_header header; + struct group *group; + struct passwd *passwd; + unsigned int sum; + + bzero(&header, sizeof(t_header)); + strncpy(header.file_name, file_name, sizeof(header.file_name)); + if (S_ISDIR(statbuf->st_mode)) + strncat(header.file_name, "/", sizeof(header.file_name) - 1); + 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)); + + switch (statbuf->st_mode & S_IFMT) + { + case S_IFREG: header.file_type[0] = '0'; break; + /* case S_IFLNK: header.file_type[0] = '0' break; */ + /* case S_IFBLK: header.file_type[0] = '0' break; */ + /* case S_IFCHR: header.file_type[0] = '0' break; */ + case S_IFDIR: header.file_type[0] = '5'; break; + /* case S_IFIFO: header.file_type[0] = '0' break; */ + /* case S_IFSOCK: header.file_type[0] = '0' break; */ + } + + memcpy(header.ustar, "ustar ", sizeof(header.ustar)); + memcpy(header.ustar_version, " ", sizeof(header.ustar_version)); + + if ((passwd = getpwuid(statbuf->st_gid)) == NULL) + { + perror("header_write getpwduid"); + return -1; + } + strncpy(header.user_name, passwd->pw_name, sizeof(header.user_name)); + if ((group = getgrgid(statbuf->st_gid)) == NULL) + { + perror("header_write getgrgid"); + return -1; + } + strncpy(header.group_name, group->gr_name, sizeof(header.group_name)); + + /* getpwuid(); */ + + for (size_t i = 0; i < sizeof(t_header); i++) + sum += ((uint8_t*)&header)[i]; + sprintf(header.checksum, "%06o", sum); + + return record_write(fd, (char*)&header, sizeof(t_header)); +} -- cgit