SysIII/usr/src/cmd/cpio.c
/* cpio COMPILE: cc -O cpio.c -s -i -o cpio
cpio -- copy file collections
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#ifdef RT
#define S_IFEXT 0120000 /* allocated by extents */
#define S_IF1EXT 0130000 /* one extent */
#endif
#define EQ(x,y) (strcmp(x,y)==0)
/* for VAX, Interdata, ... */
#define MKSHORT(v,lv) {U.l=1L;if(U.c[0]) U.l=lv,v[0]=U.s[1],v[1]=U.s[0]; else U.l=lv,v[0]=U.s[0],v[1]=U.s[1];}
#define MAGIC 070707
#define IN 1
#define OUT 2
#define PASS 3
#define HDRSIZE ((sizeof Hdr)-256)
#define LINKS 1000
#define MERT 0
#define CHARS 76
#ifdef RT
#define MERT 1 /* yes = 1 ; no = 0 */
extern long filespace;
#endif
struct stat Statb, Xstatb;
struct header {
short h_magic,
h_dev;
ushort h_ino,
h_mode,
h_uid,
h_gid;
short h_nlink,
h_rdev,
h_mtime[2],
h_namesize,
h_filesize[2];
char h_name[256];
} Hdr;
int Bufsize = 512;
short Buf[256], *Dbuf;
char BBuf[512];
char *Cbuf;
int Wct,Wc;
short *Wp;
char *Cp;
#ifdef RT
short Actual_size[2]; /* MERT variable */
struct{
long long_size;
};
#endif
short Option,
Dir,
Uncond,
Link,
Rename,
Toc,
Verbose,
Select,
Mod_time,
Acc_time,
Cflag,
Swap;
int Ifile,
Ofile,
Input = 0,
Output = 1;
long Blocks,
Longfile,
Longtime;
char Fullname[256],
Name[256];
int Pathend;
FILE *Rtty,
*Wtty;
char *Pattern[100];
char Strhdr[500];
char *Chdr = Strhdr;
short Dev,
Uid,
Gid,
A_directory,
A_special,
#ifdef RT
One_extent,
Multi_extent,
#endif
Filetype = S_IFMT;
#ifdef RT
short Remove_mode = 0007777;
short New_mode;
#endif
extern errno;
char *malloc();
char *cd();
char *Cd_name;
FILE *popen();
union { long l; short s[2]; char c[4]; } U;
/* for VAX, Interdata, ... */
long mklong(v)
short v[];
{
U.l = 1;
if(U.c[0])
U.s[0] = v[1], U.s[1] = v[0];
else
U.s[0] = v[0], U.s[1] = v[1];
return U.l;
}
main(argc, argv)
char **argv;
{
register ct;
long filesz;
long lng;
register char *fullp;
register i;
signal(SIGSYS, 1);
if(*argv[1] != '-')
usage();
Uid = getuid();
umask(0);
Gid = getgid();
Pattern[0] = "*";
while(*++argv[1]) {
switch(*argv[1]) {
case 'a':
Acc_time++;
break;
case 'B':
Bufsize = 5120;
break;
case 'i':
Option = IN;
if(argc > 2 ) {
for(i = 0; (i+2) < argc; ++i)
Pattern[i] = argv[i+2];
}
break;
case 'o':
if(argc != 2)
usage();
Option = OUT;
break;
case 'p':
if(argc != 3)
usage();
if(access(argv[2], 2) == -1) {
accerr:
err("cannot write in <%s>\n", argv[2]);
exit(2);
}
strcpy(Fullname, argv[2]);
strcat(Fullname, "/");
stat(Fullname, &Xstatb);
if((Xstatb.st_mode&S_IFMT) != S_IFDIR)
goto accerr;
Option = PASS;
Dev = Xstatb.st_dev;
break;
case 'c':
Cflag++;
break;
case 'd':
Dir++;
break;
case 'l':
Link++;
break;
case 'm':
Mod_time++;
break;
case 'r':
Rename++;
Rtty = fopen("/dev/tty", "r");
Wtty = fopen("/dev/tty", "w");
if(Rtty==NULL || Wtty==NULL) {
err(
"Cannot rename (/dev/tty missing)\n");
exit(2);
}
break;
case 's':
Swap++;
break;
case 't':
Toc++;
break;
case 'u':
Uncond++;
break;
case 'v':
Verbose++;
break;
case '6':
Filetype = 060000;
break;
default:
usage();
}
}
if(!Option) {
err("Options must include o|i|p\n");
exit(2);
}
if (Cflag && Swap) {
err("Swap flag is ignored with Cflag\n");
Swap = 0;
}
if(Option != PASS) {
Wp = Dbuf = (short *)malloc(Bufsize);
Cp = Cbuf = (char *)malloc(Bufsize);
}
Wct = Bufsize >> 1;
Wc = Bufsize;
if(Option == PASS && Rename) {
err("Pass and Rename cannot be used together");
exit(2);
}
switch(Option) {
case OUT:
while(getname()) {
if( mklong(Hdr.h_filesize) == 0L) {
if ( Cflag )
writehdr(Chdr,CHARS+Hdr.h_namesize);
else
bwrite(&Hdr, HDRSIZE+Hdr.h_namesize);
#ifdef RT
if( (MERT) && (((Hdr.h_mode & Filetype) == S_IF1EXT)
|| ((Hdr.h_mode & Filetype) == S_IFEXT))) {
actsize();
bwrite(&Hdr, HDRSIZE+Hdr.h_namesize);
}
#endif
continue;
}
if((Ifile = open(Hdr.h_name, 0)) < 0) {
err("<%s> ?\n", Hdr.h_name);
continue;
}
if ( Cflag )
writehdr(Chdr,CHARS+Hdr.h_namesize);
else
bwrite(&Hdr, HDRSIZE+Hdr.h_namesize);
#ifdef RT
if( (MERT) && (((Hdr.h_mode & Filetype) == S_IF1EXT)
|| ((Hdr.h_mode & Filetype) == S_IFEXT))) {
actsize();
bwrite(&Hdr, HDRSIZE+Hdr.h_namesize);
}
#endif
for(filesz=mklong(Hdr.h_filesize); filesz>0; filesz-= 512){
ct = filesz>512? 512: filesz;
if(read(Ifile, Cflag? BBuf: (char *)Buf, ct) < 0) {
err("Cannot read %s\n", Hdr.h_name);
continue;
}
Cflag? writehdr(BBuf,ct): bwrite(Buf,ct);
}
close(Ifile);
if(Acc_time)
utime(Hdr.h_name, &Statb.st_atime);
if(Verbose)
err("%s\n", Hdr.h_name);
}
strcpy(Hdr.h_name, "TRAILER!!!");
Hdr.h_magic = MAGIC;
MKSHORT(Hdr.h_filesize, 0L);
Hdr.h_namesize = strlen("TRAILER!!!") + 1;
if ( Cflag ) {
lng = 0;
bintochar(lng);
writehdr(Chdr,CHARS+Hdr.h_namesize);
}
else
bwrite(&Hdr, HDRSIZE+Hdr.h_namesize);
Cflag? writehdr(Cbuf, Bufsize): bwrite(Dbuf, Bufsize);
break;
case IN:
pwd();
while(gethdr()) {
Ofile = ckname(Hdr.h_name)? openout(Hdr.h_name): 0;
for(filesz=mklong(Hdr.h_filesize); filesz>0; filesz-= 512){
ct = filesz>512? 512: filesz;
Cflag? readhdr(BBuf, ct): bread(Buf, ct);
if(Ofile) {
if(Swap)
swap(Buf, ct);
if(write(Ofile, Cflag? BBuf: (char *)Buf, ct) < 0) {
err("Cannot write %s\n", Hdr.h_name);
continue;
}
}
}
if(Ofile) {
close(Ofile);
set_time(Cd_name, mklong(Hdr.h_mtime), mklong(Hdr.h_mtime));
}
if(!Select)
continue;
if(Verbose)
if(Toc)
pentry(Hdr.h_name);
else
puts(Hdr.h_name);
else if(Toc)
puts(Hdr.h_name);
}
break;
case PASS:
fullp = Fullname + strlen(Fullname);
while(getname()) {
if(!ckname(Hdr.h_name))
continue;
strcpy(fullp, Hdr.h_name);
if(Link
&& !A_directory
&& Dev == Statb.st_dev) {
/* ??? && (Uid == Statb.st_uid || !Uid)) {*/
if(link(Hdr.h_name, Fullname) < 0) { /* missing dir.? */
unlink(Fullname);
missdir(Fullname);
if(link(Hdr.h_name, Fullname) < 0) {
err(
"Cannot link <%s> & <%s>\n",
Hdr.h_name, Fullname);
continue;
}
}
set_time(Hdr.h_name, mklong(Hdr.h_mtime), mklong(Hdr.h_mtime));
goto ckverbose;
}
if(!(Ofile = openout(Fullname)))
continue;
if((Ifile = open(Hdr.h_name, 0)) < 0) {
err("<%s> ?\n", Hdr.h_name);
close(Ofile);
continue;
}
filesz = Statb.st_size;
for(; filesz > 0; filesz -= 512) {
ct = filesz>512? 512: filesz;
if(read(Ifile, Buf, ct) < 0) {
err("Cannot read %s\n", Hdr.h_name);
break;
}
if(Ofile)
if(write(Ofile, Buf, ct) < 0) {
err("Cannot write %s\n", Hdr.h_name);
break;
}
++Blocks;
}
close(Ifile);
if(Acc_time)
utime(Hdr.h_name, &Statb.st_atime);
if(Ofile) {
close(Ofile);
set_time(Fullname, Statb.st_atime, mklong(Hdr.h_mtime));
ckverbose:
if(Verbose)
puts(Fullname);
}
}
}
err("%ld blocks\n", Blocks * (Bufsize>>9));
exit(0);
}
usage()
{
err("Usage: cpio -o[acvB] <name-list >collection\n%s\n%s\n",
" cpio -i[cdmrstuvB6] [pattern ...] <collection",
" cpio -p[adlmruv] directory <name-list");
exit(2);
}
getname()
{
register char *namep = Name;
long tlong;
for(;;) {
if(gets(namep) == NULL)
return 0;
if(*namep == '.' && namep[1] == '/')
namep += 2;
strcpy(Hdr.h_name, namep);
if(stat(namep, &Statb) < 0) {
err("< %s > ?\n", Hdr.h_name);
continue;
}
A_directory = (Statb.st_mode & Filetype) == S_IFDIR;
A_special = ((Statb.st_mode & Filetype) == S_IFBLK)
|| ((Statb.st_mode & Filetype) == S_IFCHR)
|| ((Statb.st_mode & Filetype) == S_IFIFO);
#ifdef RT
if(MERT) {
One_extent = (Statb.st_mode & Filetype) == S_IF1EXT;
Multi_extent = (Statb.st_mode & Filetype) == S_IFEXT;
}
#endif
Hdr.h_magic = MAGIC;
Hdr.h_namesize = strlen(Hdr.h_name) + 1;
Hdr.h_uid = Statb.st_uid;
Hdr.h_gid = Statb.st_gid;
Hdr.h_dev = Statb.st_dev;
Hdr.h_ino = Statb.st_ino;
Hdr.h_mode = Statb.st_mode;
MKSHORT(Hdr.h_mtime, Statb.st_mtime);
Hdr.h_nlink = Statb.st_nlink;
tlong = Hdr.h_mode & S_IFREG? Statb.st_size: 0L;
MKSHORT(Hdr.h_filesize, tlong);
Hdr.h_rdev = Statb.st_rdev;
if(Cflag)
bintochar(tlong);
return 1;
}
}
bintochar(t)
long t;
{
sprintf(Chdr,"%.6o%.6ho%.6ho%.6ho%.6ho%.6ho%.6ho%.6ho%.11lo%.6ho%.11lo%s",
MAGIC,Statb.st_dev,Statb.st_ino,Statb.st_mode,Statb.st_uid,
Statb.st_gid,Statb.st_nlink,Statb.st_rdev & 00000177777,
Statb.st_mtime,(short)strlen(Hdr.h_name)+1,t,Hdr.h_name);
}
chartobin()
{
sscanf(Chdr,"%6o%6ho%6ho%6ho%6ho%6ho%6ho%6ho%11lo%6ho%11lo",
&Hdr.h_magic,&Hdr.h_dev,&Hdr.h_ino,&Hdr.h_mode,&Hdr.h_uid,
&Hdr.h_gid,&Hdr.h_nlink,&Hdr.h_rdev,&Longtime,&Hdr.h_namesize,
&Longfile);
MKSHORT(Hdr.h_filesize, Longfile);
MKSHORT(Hdr.h_mtime, Longtime);
}
gethdr()
{
if ( Cflag ) {
readhdr(Chdr,CHARS);
chartobin();
}
else
bread(&Hdr, HDRSIZE);
if(Hdr.h_magic != MAGIC) {
err("Out of phase--get help");
exit(2);
}
if(!Cflag)
bread(Hdr.h_name, Hdr.h_namesize);
else
readhdr(Hdr.h_name, Hdr.h_namesize);
if(Swap)
swap(Hdr.h_name, Hdr.h_namesize);
if(EQ(Hdr.h_name, "TRAILER!!!"))
return 0;
A_directory = (Hdr.h_mode & Filetype) == S_IFDIR;
A_special =((Hdr.h_mode & Filetype) == S_IFBLK)
|| ((Hdr.h_mode & Filetype) == S_IFCHR)
|| ((Hdr.h_mode & Filetype) == S_IFIFO);
#ifdef RT
if( (MERT) && (((Hdr.h_mode & Filetype) == S_IF1EXT)
|| ((Hdr.h_mode & Filetype) == S_IFEXT))) {
One_extent = (Hdr.h_mode & Filetype) == S_IF1EXT;
Multi_extent = (Hdr.h_mode & Filetype) == S_IFEXT;
Actual_size[0] = Hdr.h_filesize[0];
Actual_size[1] = Hdr.h_filesize[1];
bread(&Hdr, HDRSIZE);
if(Hdr.h_magic != MAGIC) {
err("Out of phase--get MERT help");
exit(2);
}
bread(Hdr.h_name, Hdr.h_namesize);
}
#endif
return 1;
}
ckname(namep)
register char *namep;
{
++Select;
if(!nmatch(namep, Pattern)) {
Select = 0;
return 0;
}
if(Rename && !A_directory) {
fprintf(Wtty, "Rename <%s>\n", namep);
fflush(Wtty);
fgets(namep, 128, Rtty);
if(feof(Rtty))
exit(2);
namep[strlen(namep) - 1] = '\0';
if(EQ(namep, "")) {
printf("Skipped\n");
return 0;
}
}
return !Toc;
}
openout(namep)
register char *namep;
{
register f;
register char *np;
if(!strncmp(namep, "./", 2))
namep += 2;
np = namep;
if(Option == IN)
Cd_name = namep = cd(namep);
if(A_directory) {
if(!Dir
|| Rename
|| EQ(namep, ".")
|| EQ(namep, "..")
|| stat(namep, &Xstatb) == 0)
return 0;
if(!makdir(namep)) {
missdir(namep);
}
ret:
chmod(namep, Hdr.h_mode);
if(Uid == 0)
chown(namep, Hdr.h_uid, Hdr.h_gid);
set_time(namep, mklong(Hdr.h_mtime), mklong(Hdr.h_mtime));
return 0;
}
if(Hdr.h_nlink > 1)
if(!postml(namep, np))
return 0;
if(A_special) {
s_again:
if((Hdr.h_mode & Filetype) == S_IFIFO)
Hdr.h_rdev = 0;
if(mknod(namep, Hdr.h_mode, Hdr.h_rdev) < 0) {
if(missdir(namep))
goto s_again;
err("Cannot mknod <%s>\n", namep);
return 0;
}
goto ret;
}
if(stat(namep, &Xstatb) == 0) {
if(Uncond && !(Xstatb.st_mode & S_IWRITE))
unlink(namep);
if(!Uncond && (mklong(Hdr.h_mtime) < Xstatb.st_mtime)) {
err("current <%s> newer\n", namep);
return 0;
}
}
if(Option == PASS
&& Hdr.h_ino == Xstatb.st_ino
&& Hdr.h_dev == Xstatb.st_dev) {
err("Attempt to pass file to self!\n");
exit(2);
}
#ifdef RT
one_again:
if(One_extent || Multi_extent) {
if((f = falloc(namep, Hdr.h_mode, Hdr.h_filesize[0].long_size)) < 0) {
if(missdir(namep))
goto one_again;
err("Cannot create <%s> (errno:%d)\n", namep, errno);
return 0;
}
if(filespace < Hdr.h_filesize[0].long_size){
err("Cannot create contiguous file <%s> proper size\n", namep);
err(" <%s> will be created as a regular file\n", namep);
if(unlink(Fullname) != 0)
err("<%s> not removed\n", namep);
New_mode = Hdr.h_mode & Remove_mode;
New_mode = New_mode | S_IFREG;
once_again:
if((f = creat(namep, New_mode)) < 0){
if(missdir(namep))
goto once_again;
err("Cannot create <%s> (errno:%d)\n", namep, errno);
return (0);
}
}
}
#endif
#ifdef RT
if(MERT && (One_extent || Multi_extent))
goto skip_c;
#endif
c_again:
if((f = creat(namep, Hdr.h_mode)) < 0) {
if(missdir(namep))
goto c_again;
err("Cannot create <%s> (errno:%d)\n", namep, errno);
return 0;
}
#ifdef RT
skip_c:
#endif
if(Uid == 0)
chown(namep, Hdr.h_uid, Hdr.h_gid);
return f;
}
bread(b, c)
register c;
register short *b;
{
static nleft = 0;
static short *ip;
register short *p = ip;
c = (c+1)>>1;
while(c--) {
if(!nleft) {
again:
if(read(Input, Dbuf, Bufsize)!=Bufsize) {
Input = chgreel(0, Input);
goto again;
}
nleft = Bufsize >> 1;
p = Dbuf;
++Blocks;
}
*b++ = *p++;
--nleft;
}
ip = p;
}
readhdr(b, c)
register c;
register char *b;
{
static nleft = 0;
static char *ip;
register char *p = ip;
while(c--) {
if(!nleft) {
again:
if(read(Input, Cbuf, Bufsize) != Bufsize) {
Input = chgreel(0, Input);
goto again;
}
nleft = Bufsize;
p = Cbuf;
++Blocks;
}
*b++ = *p++;
--nleft;
}
ip = p;
}
bwrite(rp, c)
register short *rp;
register c;
{
register short *wp = Wp;
c = (c+1) >> 1;
while(c--) {
if(!Wct) {
again:
if(write(Output, Dbuf, Bufsize)<0) {
Output = chgreel(1, Output);
goto again;
}
Wct = Bufsize >> 1;
wp = Dbuf;
++Blocks;
}
*wp++ = *rp++;
--Wct;
}
Wp = wp;
}
writehdr(rp,c)
register char *rp;
register c;
{
register char *cp = Cp;
while(c--) {
if(!Wc) {
again:
if(write(Output,Cbuf,Bufsize)<0) {
Output = chgreel(1, Output);
goto again;
}
Wc = Bufsize;
cp = Cbuf;
++Blocks;
}
*cp++ = *rp++;
--Wc;
}
Cp = cp;
}
postml(namep, np)
register char *namep, *np;
{
register i;
static struct ml {
short m_dev,
m_ino;
char m_name[2];
} *ml[LINKS];
static mlinks = 0;
char *mlp;
for(i = 0; i < mlinks; ++i) {
if(mlinks == LINKS) break;
if(ml[i]->m_ino==Hdr.h_ino &&
ml[i]->m_dev==Hdr.h_dev) {
if(Verbose)
printf("%s linked to %s\n", ml[i]->m_name,
np);
unlink(namep);
if(Option == IN) {
Fullname[Pathend] = '\0';
strcat(Fullname, ml[i]->m_name);
mlp = Fullname;
} else
mlp = ml[i]->m_name;
l_again:
if(link(mlp, namep) < 0) {
if(missdir(np))
goto l_again;
err("Cannot link <%s>&<%s>.\n",
ml[i]->m_name, np);
}
set_time(namep, mklong(Hdr.h_mtime), mklong(Hdr.h_mtime));
return 0;
}
}
if(mlinks == LINKS
|| !(ml[mlinks] = (struct ml *)malloc(strlen(np) + 2 + sizeof(struct ml)))) {
static int first=1;
if(first)
if(mlinks == LINKS)
err("Too many links\n");
else
err("No memory for links\n");
mlinks = LINKS;
first = 0;
return 1;
}
ml[mlinks]->m_dev = Hdr.h_dev;
ml[mlinks]->m_ino = Hdr.h_ino;
strcpy(ml[mlinks]->m_name, np);
++mlinks;
return 1;
}
pentry(namep)
register char *namep;
{
register i;
static short lastid = -1;
#include <pwd.h>
static struct passwd *pw;
struct passwd *getpwuid();
static char tbuf[32];
printf("%-7o", Hdr.h_mode & 0177777);
if(lastid == Hdr.h_uid)
printf("%-6s", pw->pw_name);
else {
setpwent();
if(pw = getpwuid(Hdr.h_uid)) {
printf("%-6s", pw->pw_name);
lastid = Hdr.h_uid;
} else {
printf("%-6d", Hdr.h_uid);
lastid = -1;
}
}
printf("%7ld ", mklong(Hdr.h_filesize));
U.l = mklong(Hdr.h_mtime);
strcpy(tbuf, ctime(&U.l));
tbuf[24] = '\0';
printf(" %s %s\n", &tbuf[4], namep);
}
nmatch(s, pat)
char *s, **pat;
{
if(EQ(*pat, "*"))
return 1;
while(*pat) {
if((**pat == '!' && !gmatch(s, *pat+1))
|| gmatch(s, *pat))
return 1;
++pat;
}
return 0;
}
gmatch(s, p)
register char *s, *p;
{
register int c;
register cc, ok, lc, scc;
scc = *s;
lc = 077777;
switch (c = *p) {
case '[':
ok = 0;
while (cc = *++p) {
switch (cc) {
case ']':
if (ok)
return(gmatch(++s, ++p));
else
return(0);
case '-':
ok |= (lc <= scc & scc <= (cc=p[1]));
}
if (scc==(lc=cc)) ok++;
}
return(0);
case '?':
caseq:
if(scc) return(gmatch(++s, ++p));
return(0);
case '*':
return(umatch(s, ++p));
case 0:
return(!scc);
}
if (c==scc) goto caseq;
return(0);
}
umatch(s, p)
register char *s, *p;
{
if(*p==0) return(1);
while(*s)
if (gmatch(s++,p)) return(1);
return(0);
}
makdir(namep)
register char *namep;
{
static status;
register pid;
if(pid = fork())
while(wait(&status) != pid);
else {
close(2);
execl("/bin/mkdir", "mkdir", namep, 0);
exit(2);
}
return ((status>>8) & 0377)? 0: 1;
}
swap(buf, ct)
register ct;
register union swp { short shortw; char charv[2]; } *buf;
{
register char c;
ct = (ct + 1) >> 1;
while(ct--) {
c = buf->charv[0];
buf->charv[0] = buf->charv[1];
buf->charv[1] = c;
++buf;
}
}
set_time(namep, atime, mtime)
register *namep;
long atime, mtime;
{
static long timevec[2];
if(!Mod_time)
return;
timevec[0] = atime;
timevec[1] = mtime;
utime(namep, timevec);
}
chgreel(x, fl)
{
register f;
char str[22];
FILE *devtty;
struct stat statb;
err("errno: %d, ", errno);
err("Can't %s\n", x? "write output": "read input");
fstat(fl, &statb);
#ifdef RT
if(!MERT){
if((statb.st_mode&S_IFMT) != S_IFCHR)
exit(2);
}
else if((statb.st_mode & (S_IFBLK|S_IFREC))==0)
exit(2);
#endif
#ifndef RT
if((statb.st_mode&S_IFMT) != S_IFCHR)
exit(2);
#endif
again:
err("If you want to go on, type device/file name when ready\n");
devtty = fopen("/dev/tty", "r");
fgets(str, 20, devtty);
str[strlen(str) - 1] = '\0';
if(!*str)
exit(2);
close(fl);
if((f = open(str, x? 1: 0)) < 0) {
err("That didn't work");
fclose(devtty);
goto again;
}
return f;
}
missdir(namep)
register char *namep;
{
register char *np;
register ct = 0;
if(!Dir)
return 0;
for(np = namep; *np; ++np)
if(*np == '/') {
*np = '\0';
if(stat(namep, &Xstatb) == -1)
makdir(namep), ++ct;
*np = '/';
}
return ct;
}
err(a, b, c)
{
fprintf(stderr, a, b, c);
}
pwd()
{
FILE *dir;
dir = popen("pwd", "r");
fgets(Fullname, 256, dir);
if(pclose(dir))
exit(2);
Pathend = strlen(Fullname);
Fullname[Pathend - 1] = '/';
}
char * cd(n)
register char *n;
{
char *p_save = Name, *n_save = n, *p_end = 0;
register char *p = Name;
static char dotdot[]="../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../";
int slashes;
if(*n == '/') /* don't try to chdir on full pathnames */
return n;
for(; *p && *n == *p; ++p, ++n) { /* whatever part of strings == */
if(*p == '/')
p_save = p+1, n_save = n+1;
}
p = p_save;
*p++ = '\0';
for(slashes = 0; *p; ++p) { /* if prev is longer, chdir("..") */
if(*p == '/')
++slashes;
}
p = p_save;
if(slashes) {
slashes = slashes * 3 - 1;
dotdot[slashes] = '\0';
chdir(dotdot);
dotdot[slashes] = '/';
}
n = n_save;
for(; *n; ++n, ++p) {
*p = *n;
if(*n == '/')
p_end = p+1, n_save = n+1;
}
*p = '\0';
if(p_end) {
*p_end = '\0';
if(chdir(p_save) == -1) {
if(!missdir(p_save)) {
cd_err:
err("Cannot chdir (no `d' option)\n");
exit(2);
} else if(chdir(p_save) == -1)
goto cd_err;
}
} else
*p_save = '\0';
return n_save;
}
#ifdef RT
actsize()
{
}
#endif