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tar: make z flag work, even when no file name was provided (thanks aiju)

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tar used to infer compression type from the filenames extension, but when
no file name is given (stdin/stdout), the -z flag was ignored and no
compression filter applied. this changes tar to assume the default
gzip compression method when z is given and no file name is specified.
This commit is contained in:
cinap_lenrek 2015-09-08 18:27:48 +02:00
parent 4d4b825dea
commit c7eae3fb72
1 changed files with 21 additions and 16 deletions
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37
sys/src/cmd/tar.c
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@ -222,16 +222,20 @@ ewrite(char *name, int fd, void *buf, long len)
static Compress *
compmethod(char *name)
{
int i, nmlen = strlen(name), sfxlen;
Compress *cp;
if (name) {
int i, nmlen, sfxlen;
Compress *cp;
for (cp = comps; cp < comps + nelem(comps); cp++)
for (i = 0; i < nelem(cp->sfx) && cp->sfx[i]; i++) {
sfxlen = strlen(cp->sfx[i]);
if (nmlen > sfxlen &&
strcmp(cp->sfx[i], name + nmlen - sfxlen) == 0)
return cp;
nmlen = strlen(name);
for (cp = comps; cp < comps + nelem(comps); cp++) {
for (i = 0; i < nelem(cp->sfx) && cp->sfx[i]; i++) {
sfxlen = strlen(cp->sfx[i]);
if (nmlen > sfxlen &&
strcmp(cp->sfx[i], name + nmlen - sfxlen) == 0)
return cp;
}
}
}
return docompress? comps: nil;
}
@ -880,14 +884,15 @@ replace(char **argv)
if (usefile && docreate) {
ar = create(usefile, OWRITE, 0666);
if (docompress)
comp = compmethod(usefile);
} else if (usefile)
ar = open(usefile, ORDWR);
else
ar = Stdout;
if (comp)
ar = push(ar, comp->comp, Output, &ps);
if (docreate && docompress) {
comp = compmethod(usefile);
if (comp)
ar = push(ar, comp->comp, Output, &ps);
}
if (ar < 0)
sysfatal("can't open archive %s: %r", usefile);
@ -1253,14 +1258,14 @@ extract(char **argv)
int ar;
char *longname;
Hdr *hp;
Compress *comp = nil;
Compress *comp;
Pushstate ps;
if (usefile) {
if (usefile)
ar = open(usefile, OREAD);
comp = compmethod(usefile);
} else
else
ar = Stdin;
comp = compmethod(usefile);
if (comp)
ar = push(ar, comp->decomp, Input, &ps);
if (ar < 0)