Split generic tar code off to static library

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 0 insertions, 248 deletions

diff --git a/tar/write_header.c b/tar/write_header.c
deleted file mode 100644
index 80db327..0000000
--- a/tar/write_header.c
+++ /dev/null
@@ -1,248 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-#include "util.h"
-#include "tar.h"
-
-#include <sys/sysmacros.h>
-#include <string.h>
-#include <stdio.h>
-
-static unsigned long pax_hdr_counter = 0;
-static char buffer[4096];
-
-static void write_octal(char *dst, unsigned int value, int digits)
-{
-	char temp[64];
-
-	sprintf(temp, "%0*o ", digits, value);
-	memcpy(dst, temp, strlen(temp));
-}
-
-static int name_to_tar_header(tar_header_t *hdr, const char *path)
-{
-	size_t len = strlen(path);
-	const char *ptr;
-
-	if ((len + 1) <= sizeof(hdr->name)) {
-		memcpy(hdr->name, path, len);
-		return 0;
-	}
-
-	for (ptr = path; ; ++ptr) {
-		ptr = strchr(ptr, '/');
-		if (ptr == NULL)
-			return -1;
-
-		len = ptr - path;
-		if (len >= sizeof(hdr->prefix))
-			continue;
-		if (strlen(ptr + 1) >= sizeof(hdr->name))
-			continue;
-		break;
-	}
-
-	memcpy(hdr->prefix, path, ptr - path);
-	memcpy(hdr->name, ptr + 1, strlen(ptr + 1));
-	return 0;
-}
-
-static void init_header(tar_header_t *hdr, const struct stat *sb,
-			const char *name, const char *slink_target)
-{
-	memset(hdr, 0, sizeof(*hdr));
-
-	name_to_tar_header(hdr, name);
-	memcpy(hdr->magic, TAR_MAGIC, sizeof(hdr->magic));
-	memcpy(hdr->version, TAR_VERSION, sizeof(hdr->version));
-	write_octal(hdr->mode, sb->st_mode & ~S_IFMT, 6);
-	write_octal(hdr->uid, sb->st_uid, 6);
-	write_octal(hdr->gid, sb->st_gid, 6);
-	write_octal(hdr->mtime, sb->st_mtime, 11);
-	write_octal(hdr->size, 0, 11);
-	write_octal(hdr->devmajor, 0, 6);
-	write_octal(hdr->devminor, 0, 6);
-
-	switch (sb->st_mode & S_IFMT) {
-	case S_IFREG:
-		write_octal(hdr->size, sb->st_size & 077777777777L, 11);
-		break;
-	case S_IFLNK:
-		if (sb->st_size < (off_t)sizeof(hdr->linkname))
-			strcpy(hdr->linkname, slink_target);
-		break;
-	case S_IFCHR:
-	case S_IFBLK:
-		write_octal(hdr->devmajor, major(sb->st_rdev), 6);
-		write_octal(hdr->devminor, minor(sb->st_rdev), 6);
-		break;
-	}
-
-	sprintf(hdr->uname, "%u", sb->st_uid);
-	sprintf(hdr->gname, "%u", sb->st_gid);
-}
-
-static void update_checksum(tar_header_t *hdr)
-{
-	unsigned int chksum = 0;
-	size_t i;
-
-	memset(hdr->chksum, ' ', sizeof(hdr->chksum));
-
-	for (i = 0; i < sizeof(*hdr); ++i)
-		chksum += ((unsigned char *)hdr)[i];
-
-	write_octal(hdr->chksum, chksum, 6);
-	hdr->chksum[6] = '\0';
-	hdr->chksum[7] = ' ';
-}
-
-static bool need_pax_header(const struct stat *sb, const char *name)
-{
-	tar_header_t tmp;
-
-	if (sb->st_uid > 0777777 || sb->st_gid > 0777777)
-		return true;
-
-	if (S_ISREG(sb->st_mode) && sb->st_size > 077777777777L)
-		return true;
-
-	if (S_ISLNK(sb->st_mode) && sb->st_size >= (off_t)sizeof(tmp.linkname))
-		return true;
-
-	if (name_to_tar_header(&tmp, name))
-		return true;
-
-	return false;
-}
-
-static char *write_pax_entry(char *dst, const char *key, const char *value)
-{
-	size_t i, len, prefix = 0, oldprefix;
-
-	do {
-		len = prefix + 1 + strlen(key) + 1 + strlen(value) + 1;
-
-		oldprefix = prefix;
-		prefix = 1;
-
-		for (i = len; i >= 10; i /= 10)
-			++prefix;
-	} while (oldprefix != prefix);
-
-	sprintf(dst, "%zu %s=%s\n", len, key, value);
-
-	return dst + len;
-}
-
-static int write_pax_header(int fd, const struct stat *sb, const char *name,
-			    const char *slink_target)
-{
-	char temp[64], *ptr;
-	struct stat fakesb;
-	tar_header_t hdr;
-	ssize_t ret;
-	size_t len;
-
-	memset(buffer, 0, sizeof(buffer));
-	memset(&fakesb, 0, sizeof(fakesb));
-	fakesb.st_mode = S_IFREG | 0644;
-
-	sprintf(temp, "pax%lu", pax_hdr_counter);
-	init_header(&hdr, &fakesb, temp, NULL);
-	hdr.typeflag = TAR_TYPE_PAX;
-
-	sprintf(temp, "%u", sb->st_uid);
-	ptr = buffer;
-	ptr = write_pax_entry(ptr, "uid", temp);
-	ptr = write_pax_entry(ptr, "uname", temp);
-
-	sprintf(temp, "%lu", sb->st_mtime);
-	ptr = write_pax_entry(ptr, "mtime", temp);
-
-	sprintf(temp, "%u", sb->st_gid);
-	ptr = write_pax_entry(ptr, "gid", temp);
-	ptr = write_pax_entry(ptr, "gname", temp);
-
-	ptr = write_pax_entry(ptr, "path", name);
-
-	if (S_ISLNK(sb->st_mode)) {
-		ptr = write_pax_entry(ptr, "linkpath", slink_target);
-	} else if (S_ISREG(sb->st_mode)) {
-		sprintf(temp, "%lu", sb->st_size);
-		ptr = write_pax_entry(ptr, "size", temp);
-	}
-
-	len = strlen(buffer);
-	write_octal(hdr.size, len, 11);
-	update_checksum(&hdr);
-
-	ret = write_retry(fd, &hdr, sizeof(hdr));
-	if (ret < 0)
-		goto fail_wr;
-	if ((size_t)ret < sizeof(hdr))
-		goto fail_trunc;
-
-	ret = write_retry(fd, buffer, len);
-	if (ret < 0)
-		goto fail_wr;
-	if ((size_t)ret < len)
-		goto fail_trunc;
-
-	return padd_file(fd, len, 512);
-fail_wr:
-	perror("writing pax header");
-	return -1;
-fail_trunc:
-	fputs("writing pax header: truncated write\n", stderr);
-	return -1;
-}
-
-int write_tar_header(int fd, const struct stat *sb, const char *name,
-		     const char *slink_target)
-{
-	const char *reason;
-	tar_header_t hdr;
-	ssize_t ret;
-
-	if (need_pax_header(sb, name)) {
-		if (write_pax_header(fd, sb, name, slink_target))
-			return -1;
-
-		sprintf(buffer, "pax%lu_data", pax_hdr_counter++);
-		name = buffer;
-	}
-
-	init_header(&hdr, sb, name, slink_target);
-
-	switch (sb->st_mode & S_IFMT) {
-	case S_IFCHR: hdr.typeflag = TAR_TYPE_CHARDEV; break;
-	case S_IFBLK: hdr.typeflag = TAR_TYPE_BLOCKDEV; break;
-	case S_IFLNK: hdr.typeflag = TAR_TYPE_SLINK; break;
-	case S_IFREG: hdr.typeflag = TAR_TYPE_FILE; break;
-	case S_IFDIR: hdr.typeflag = TAR_TYPE_DIR; break;
-	case S_IFIFO: hdr.typeflag = TAR_TYPE_FIFO; break;
-	case S_IFSOCK:
-		reason = "cannot pack socket";
-		goto out_skip;
-	default:
-		reason = "unknown type";
-		goto out_skip;
-	}
-
-	update_checksum(&hdr);
-
-	ret = write_retry(fd, &hdr, sizeof(hdr));
-
-	if (ret < 0) {
-		perror("writing header record");
-	} else if ((size_t)ret < sizeof(hdr)) {
-		fputs("writing header record: truncated write\n", stderr);
-		ret = -1;
-	} else {
-		ret = 0;
-	}
-
-	return ret;
-out_skip:
-	fprintf(stderr, "WARNING: skipping '%s' (%s)\n", name, reason);
-	return 1;
-}