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Refactor tar(1)

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This commit is contained in:
FRIGN 2015-02-16 19:47:36 +01:00
parent bec3c32dbd
commit eb17f2cc9c
1 changed files with 48 additions and 61 deletions
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105
tar.c
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@ -11,8 +11,7 @@
#include "util.h"
typedef struct Header Header;
struct Header {
struct header {
char name[100];
char mode[8];
char uid[8];
@ -22,8 +21,8 @@ struct Header {
char chksum[8];
char type;
char link[100];
char magic[6];
char version[2];
char *magic;
char *version;
char uname[32];
char gname[32];
char major[8];
@ -31,22 +30,13 @@ struct Header {
char prefix[155];
};
enum {
Blksiz = 512
};
#define BLKSIZ 512
enum Type {
REG = '0', AREG = '\0', HARDLINK = '1', SYMLINK = '2', CHARDEV = '3',
BLOCKDEV = '4', DIRECTORY = '5', FIFO = '6'
};
static void putoctal(char *, unsigned, int);
static int archive(const char *);
static int unarchive(char *, int, char[Blksiz]);
static int print(char *, int , char[Blksiz]);
static void c(const char *, int);
static void xt(int (*)(char*, int, char[Blksiz]));
static FILE *tarfile;
static ino_t tarinode;
static dev_t tardev;
@ -58,16 +48,16 @@ static char filtermode;
static FILE *
decomp(FILE *fp)
{
int fds[2];
pid_t pid;
int fds[2];
if (pipe(fds) < 0)
eprintf("pipe:");
pid = fork();
if (pid < 0) {
if (pid < 0)
eprintf("fork:");
} else if (!pid) {
else if (!pid) {
dup2(fileno(fp), 0);
dup2(fds[1], 1);
close(fds[0]);
@ -83,7 +73,6 @@ decomp(FILE *fp)
break;
}
}
close(fds[1]);
return fdopen(fds[0], "r");
}
@ -91,21 +80,20 @@ decomp(FILE *fp)
static void
putoctal(char *dst, unsigned num, int n)
{
snprintf(dst, n, "%.*o", n-1, num);
snprintf(dst, n, "%.*o", n - 1, num);
}
static int
archive(const char* path)
{
unsigned char b[Blksiz];
unsigned chksum;
int l, x;
Header *h = (void*)b;
FILE *f = NULL;
struct stat st;
struct passwd *pw;
struct group *gr;
FILE *f;
mode_t mode;
struct group *gr;
struct header *h;
struct passwd *pw;
struct stat st;
size_t chksum, l, x;
unsigned char b[BLKSIZ];
lstat(path, &st);
if (st.st_ino == tarinode && st.st_dev == tardev) {
@ -115,15 +103,16 @@ archive(const char* path)
pw = getpwuid(st.st_uid);
gr = getgrgid(st.st_gid);
memset(b, 0, sizeof b);
snprintf(h->name, sizeof h->name, "%s", path);
putoctal(h->mode, (unsigned)st.st_mode&0777, sizeof h->mode);
putoctal(h->uid, (unsigned)st.st_uid, sizeof h->uid);
putoctal(h->gid, (unsigned)st.st_gid, sizeof h->gid);
putoctal(h->size, 0, sizeof h->size);
putoctal(h->mtime, (unsigned)st.st_mtime, sizeof h->mtime);
memcpy(h->magic, "ustar", sizeof h->magic);
memcpy(h->version, "00", sizeof h->version);
h = (void*)b;
memset(b, 0, sizeof(b));
snprintf(h->name, sizeof(h->name), "%s", path);
putoctal(h->mode, (unsigned)st.st_mode & 0777, sizeof(h->mode));
putoctal(h->uid, (unsigned)st.st_uid, sizeof(h->uid));
putoctal(h->gid, (unsigned)st.st_gid, sizeof(h->gid));
putoctal(h->size, 0, sizeof(h->size));
putoctal(h->mtime, (unsigned)st.st_mtime, sizeof(h->mtime));
h->magic = "ustar";
h->version = "00";
snprintf(h->uname, sizeof h->uname, "%s", pw ? pw->pw_name : "");
snprintf(h->gname, sizeof h->gname, "%s", gr ? gr->gr_name : "");
@ -154,26 +143,26 @@ archive(const char* path)
chksum += b[x];
putoctal(h->chksum, chksum, sizeof h->chksum);
fwrite(b, Blksiz, 1, tarfile);
fwrite(b, BLKSIZ, 1, tarfile);
if (!f)
return 0;
while ((l = fread(b, 1, Blksiz, f)) > 0) {
if (l < Blksiz)
memset(b+l, 0, Blksiz-l);
fwrite(b, Blksiz, 1, tarfile);
while ((l = fread(b, 1, BLKSIZ, f)) > 0) {
if (l < BLKSIZ)
memset(b+l, 0, BLKSIZ-l);
fwrite(b, BLKSIZ, 1, tarfile);
}
fclose(f);
return 0;
}
static int
unarchive(char *fname, int l, char b[Blksiz])
unarchive(char *fname, int l, char b[BLKSIZ])
{
char lname[101];
FILE *f = NULL;
unsigned long mode, major, minor, type, mtime;
struct timeval times[2];
Header *h = (void*)b;
struct header *h = (void*)b;
unsigned long mode, major, minor, type, mtime;
char lname[101];
if (!mflag)
mtime = strtoul(h->mtime, 0, 8);
@ -215,12 +204,11 @@ unarchive(char *fname, int l, char b[Blksiz])
default:
fprintf(stderr, "usupported tarfiletype %c\n", h->type);
}
if (getuid() == 0 && chown(fname, strtoul(h->uid, 0, 8),
strtoul(h->gid, 0, 8)))
if (getuid() == 0 && chown(fname, strtoul(h->uid, 0, 8), strtoul(h->gid, 0, 8)))
perror(fname);
for (; l > 0; l -= Blksiz) {
fread(b, Blksiz, 1, tarfile);
for (; l > 0; l -= BLKSIZ) {
fread(b, BLKSIZ, 1, tarfile);
if (f)
fwrite(b, MIN(l, 512), 1, f);
}
@ -237,11 +225,11 @@ unarchive(char *fname, int l, char b[Blksiz])
}
static int
print(char * fname, int l, char b[Blksiz])
print(char * fname, int l, char b[BLKSIZ])
{
puts(fname);
for (; l > 0; l -= Blksiz)
fread(b, Blksiz, 1, tarfile);
for (; l > 0; l -= BLKSIZ)
fread(b, BLKSIZ, 1, tarfile);
return 0;
}
@ -253,12 +241,12 @@ c(const char * path, int fflag)
}
static void
xt(int (*fn)(char*, int, char[Blksiz]))
xt(int (*fn)(char*, int, char[BLKSIZ]))
{
char b[Blksiz], fname[257], *s;
Header *h = (void*)b;
char b[BLKSIZ], fname[257], *s;
struct header *h = (void*)b;
while (fread(b, Blksiz, 1, tarfile) && h->name[0] != '\0') {
while (fread(b, BLKSIZ, 1, tarfile) && h->name[0] != '\0') {
s = fname;
if (h->prefix[0] != '\0')
s += sprintf(s, "%.*s/", (int)sizeof h->prefix, h->prefix);
@ -277,10 +265,9 @@ usage(void)
int
main(int argc, char *argv[])
{
struct stat st;
char *file = NULL, *dir = ".";
char mode = '\0';
FILE *fp;
struct stat st;
char *file = NULL, *dir = ".", mode = '\0';
ARGBEGIN {
case 'x':