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Various style fixes to the 'newc' cpio writer:

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* Warn about truncation of ino
 * Use a macro to hide the somewhat obscure pad-to-multiple-of-4 calculation
 * Eliminate some unused variables
This commit is contained in:
Tim Kientzle 2009-12-29 05:41:57 +00:00
parent bb8a41af51
commit 88f5df0d39
1 changed files with 26 additions and 17 deletions
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43
lib/libarchive/archive_write_set_format_cpio_newc.c
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@ -75,6 +75,9 @@ struct cpio_header_newc {
char c_checksum[8];
};
/* Logic trick: difference between 'n' and next multiple of 4 */
#define PAD4(n) (3 & (1 + ~(n)))
/*
* Set output format to 'cpio' format.
*/
@ -111,28 +114,34 @@ archive_write_set_format_cpio_newc(struct archive *_a)
static int
archive_write_newc_header(struct archive_write *a, struct archive_entry *entry)
{
int64_t ino;
struct cpio *cpio;
const char *p, *path;
int pathlength, ret;
int pathlength, ret, ret2;
struct cpio_header_newc h;
int pad;
cpio = (struct cpio *)a->format_data;
ret = 0;
ret2 = ARCHIVE_OK;
path = archive_entry_pathname(entry);
pathlength = strlen(path) + 1; /* Include trailing null. */
pathlength = (int)strlen(path) + 1; /* Include trailing null. */
memset(&h, 0, sizeof(h));
format_hex(0x070701, &h.c_magic, sizeof(h.c_magic));
format_hex(archive_entry_devmajor(entry), &h.c_devmajor, sizeof(h.c_devmajor));
format_hex(archive_entry_devminor(entry), &h.c_devminor, sizeof(h.c_devminor));
if (archive_entry_ino(entry) > 0xffffffff) {
archive_set_error(&a->archive, ERANGE, "large inode number truncated");
ret = ARCHIVE_WARN;
format_hex(archive_entry_devmajor(entry), &h.c_devmajor,
sizeof(h.c_devmajor));
format_hex(archive_entry_devminor(entry), &h.c_devminor,
sizeof(h.c_devminor));
ino = archive_entry_ino64(entry);
if (ino > 0xffffffff) {
archive_set_error(&a->archive, ERANGE,
"large inode number truncated");
ret2 = ARCHIVE_WARN;
}
format_hex(archive_entry_ino(entry) & 0xffffffff, &h.c_ino, sizeof(h.c_ino));
format_hex(ino & 0xffffffff, &h.c_ino, sizeof(h.c_ino));
format_hex(archive_entry_mode(entry), &h.c_mode, sizeof(h.c_mode));
format_hex(archive_entry_uid(entry), &h.c_uid, sizeof(h.c_uid));
format_hex(archive_entry_gid(entry), &h.c_gid, sizeof(h.c_gid));
@ -169,24 +178,26 @@ archive_write_newc_header(struct archive_write *a, struct archive_entry *entry)
ret = (a->compressor.write)(a, path, pathlength);
if (ret != ARCHIVE_OK)
return (ARCHIVE_FATAL);
pad = 0x3 & - (pathlength + sizeof(struct cpio_header_newc));
pad = PAD4(pathlength + sizeof(struct cpio_header_newc));
if (pad)
ret = (a->compressor.write)(a, "\0\0\0", pad);
if (ret != ARCHIVE_OK)
return (ARCHIVE_FATAL);
cpio->entry_bytes_remaining = archive_entry_size(entry);
cpio->padding = 3 & (-cpio->entry_bytes_remaining);
cpio->padding = PAD4(cpio->entry_bytes_remaining);
/* Write the symlink now. */
if (p != NULL && *p != '\0') {
ret = (a->compressor.write)(a, p, strlen(p));
if (ret != ARCHIVE_OK)
return (ARCHIVE_FATAL);
pad = 0x3 & -strlen(p);
pad = PAD4(strlen(p));
ret = (a->compressor.write)(a, "\0\0\0", pad);
}
if (ret == ARCHIVE_OK)
ret = ret2;
return (ret);
}
@ -235,17 +246,15 @@ format_hex_recursive(int64_t v, char *p, int s)
return (v);
v = format_hex_recursive(v, p+1, s-1);
*p = "0123456789abcdef"[v & 0xf];
return (v >>= 4);
return (v >> 4);
}
static int
archive_write_newc_finish(struct archive_write *a)
{
struct cpio *cpio;
int er;
struct archive_entry *trailer;
cpio = (struct cpio *)a->format_data;
trailer = archive_entry_new();
archive_entry_set_nlink(trailer, 1);
archive_entry_set_pathname(trailer, "TRAILER!!!");
@ -269,10 +278,10 @@ static int
archive_write_newc_finish_entry(struct archive_write *a)
{
struct cpio *cpio;
int to_write, ret;
size_t to_write;
int ret;
cpio = (struct cpio *)a->format_data;
ret = ARCHIVE_OK;
while (cpio->entry_bytes_remaining > 0) {
to_write = cpio->entry_bytes_remaining < a->null_length ?
cpio->entry_bytes_remaining : a->null_length;