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xvvd.c
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/*
* xvvd.c - extract archived file automatically and regard it as a
* (virtual) directory.
*/
#define NEEDSDIR
#include "xv.h"
#ifdef AUTO_EXPAND
static void vd_Dirtovd PARM((char *));
static void vd_Vdtodir PARM((char *));
static int vd_Mkvdir PARM((char *));
static int vd_Rmvdir PARM((char *));
static int vd_Movevdir PARM((char *, char *));
static void vd_addvdtable PARM((char *));
static void vd_packvdtable PARM((void));
static int vd_recursive_mkdir PARM((char *));
static int vd_recursive_rmdir PARM((char *));
static void vd_optimize_path PARM((char *));
static int vd_ftype PARM((char *));
static int vd_compp PARM((char *, char *));
static int vd_UncompressFile PARM((char *, char *));
static int vd_tarc PARM((char *));
static u_int vd_tar_sumchk PARM((char *));
static XtSignalId IdHup = 0;
static XtSignalId IdInt = 0;
static int UsedSignal = 0;
extern XtAppContext context;
#define VD_VDTABLESIZE 100
#define VD_ERR -2
#define VD_UKN -1
static char *ext_command[] = {
/* KEEP 0 */
NULL,
#define VD_ARC 1
"arc xo %s",
#define VD_ARJ 2
"unarj x %s",
#define VD_LZH 3
"lha -xf %s",
#define VD_TAR 4
"tar xvf %s",
#define VD_ZIP 5
"unzip -xo %s",
#define VD_ZOO 6
"zoo xOS %s",
};
int vdcount = 0;
static char vdroot[MAXPATHLEN+1];
static char *vdtable[VD_VDTABLESIZE];
/*
* These functions initialize and settle virtual directory system.
* Vdinit:
* creates root of virtual directory.
* Vdsettle:
* sweeps virtual directories.
*/
void Vdinit()
{
#ifndef VMS
char tmp[MAXPATHLEN+1];
xv_getwd(tmp, MAXPATHLEN+1);
if (chdir(tmpdir)) {
fprintf(stderr, "Warning: cannot chdir to tmpdir = '%s'.\n", tmpdir);
fprintf(stderr,
" I will use current directory '%s' instead of tmpdir.\n",
tmp);
}
xv_getwd(vdroot, MAXPATHLEN+1);
strcat(vdroot, "/.xvvdXXXXXX");
chdir(tmp);
#else
sprintf(vdroot, "Sys$Scratch:xvvdXXXXXX");
#endif /* VMS */
#ifdef USE_MKSTEMP
close(mkstemp(vdroot));
#else
mktemp(vdroot);
#endif
if (!vd_recursive_mkdir(vdroot))
tmpdir = vdroot;
}
void Vdsettle()
{
int i;
for (i = 0; i < vdcount; i++)
free(vdtable[i]);
vdcount = 0;
vd_recursive_rmdir(vdroot);
}
/*
* This function chdir to virtual directory, if specified path is in
* virtual directlry.
*/
int Chvdir(dir)
char *dir;
{
char buf[MAXPATHLEN+1];
if (Mkvdir(dir) == VD_ERR)
return -1;
strcpy(buf, dir);
Dirtovd(buf);
return (chdir(buf));
}
/*
* These functions convert directory <-> virtual directory.
* Dirtovd:
* front interface of vd_Dirtovd.
* vd_Dirtovd:
* converts directory to virtual directory.
* Vdtodir:
* front interface of vd_Vdtodir.
* vd_Vdtodir:
* converts virtual directory to normal directory.
* Dirtosubst:
* converts directory to substance of archive.
*/
void Dirtovd(dir)
char *dir;
{
vd_optimize_path(dir);
vd_Dirtovd(dir);
}
static void vd_Dirtovd(dir)
char *dir;
{
int i;
for (i = 0; i < vdcount; i++)
if (!strncmp(dir, vdtable[i], strlen(vdtable[i]))) {
char tmp[MAXPATHLEN+1];
sprintf(tmp, "%s%s", vdroot, dir);
strcpy(dir, tmp);
Dirtovd(dir);
}
}
void Vdtodir(dir)
char *dir;
{
vd_optimize_path(dir);
vd_Vdtodir(dir);
}
static void vd_Vdtodir(vd)
char *vd;
{
int i;
char tmp[MAXPATHLEN+1];
for (i = vdcount-1; i >= 0; i--) {
sprintf(tmp, "%s%s", vdroot, vdtable[i]);
if(!strncmp(vd, tmp, strlen(tmp))) {
strcpy(tmp, vd+strlen(vdroot));
strcpy(vd, tmp);
Vdtodir(vd);
}
}
}
void Dirtosubst(dir)
char *dir;
{
char tmp[MAXPATHLEN+1];
Dirtovd(dir);
strcpy(tmp, dir+strlen(vdroot));
if (Isarchive(tmp))
strcpy(dir, tmp);
}
/*
* These functions make virtual directory and extracts archive, if
* specified path is archive.
* Mkvdir:
* front interface of vd_Mkvdir.
* vd_Mkvdir:
* does real work.
* Mkvdir_force: (used by makeThumbDir(in xvbrowse.c) only)
* make virtual directory by force.
*/
int Mkvdir(dir)
char *dir;
{
char dir1[MAXPATHLEN+1], dir2[MAXPATHLEN+1];
char *d1, *d2;
int rv;
#if defined(SYSV) || defined(SVR4) || defined(__USE_XOPEN_EXTENDED)
sighold(SIGHUP);
sighold(SIGCHLD);
#else
int mask;
mask = sigblock(sigmask(SIGHUP)|sigmask(SIGCHLD));
#endif
strcpy(dir1, dir);
vd_optimize_path(dir1);
if ((rv = vd_Mkvdir(dir1)) != VD_ERR)
goto MKVDIR_END;
strcpy(dir2, dir1);
d2 = dir2 + strlen(dir2);
while (rv == VD_ERR) {
d2--;
while (*d2 != '/')
d2--;
*d2 = '\0';
rv = vd_Mkvdir(dir2);
}
d1 = dir1 + strlen(dir2);
while ((rv != VD_ERR) && (*d1 != '\0')) {
*d2++ = *d1++;
while ((*d1 != '/') && (*d1 != '\0'))
*d2++ = *d1++;
*d2 = '\0';
rv = vd_Mkvdir(dir2);
}
MKVDIR_END:
#if defined(SYSV) || defined(SVR4) || defined(__USE_XOPEN_EXTENDED)
sigrelse(SIGHUP);
sigrelse(SIGCHLD);
#else
sigsetmask(mask);
#endif
return rv;
}
static int vd_Mkvdir(dir)
char *dir;
{
char dir1[MAXPATHLEN+1], dir2[MAXPATHLEN+1], tmp[MAXPATHLEN+1];
int ftype, i;
struct stat st;
FILE *pfp;
strcpy(dir1, dir);
Dirtovd(dir1);
strcpy(dir2, dir1);
WaitCursor();
if ((ftype = vd_ftype(dir1)) < 0) {
SetCursors(-1);
return ftype;
}
if (ftype == RFT_COMPRESS) {
if (!(ftype = vd_compp(dir1, tmp))) {
SetCursors(-1);
return ftype;
}
strcpy(dir1, tmp);
}
if (!stat(dir1, &st)) {
for(i = 0; i < vdcount; i++)
if (!strcmp(vdtable[i], dir2)) {
SetCursors(-1);
return 0;
}
if (!S_ISDIR(st.st_mode)) {
char origdir[MAXPATHLEN+1], buf[MAXPATHLEN+10], buf1[100];
if (vdcount >= VD_VDTABLESIZE) {
ErrPopUp("Sorry, you can't make virtual directory any more.",
"\nBummer!");
goto VD_MKVDIR_ERR;
}
WaitCursor();
xv_getwd(origdir, MAXPATHLEN+1);
sprintf(tmp, "%s%s", vdroot, dir2);
if (vd_recursive_mkdir(tmp) || chdir(tmp)) {
SetISTR(ISTR_INFO, "fail to make virtual directory.");
Warning();
goto VD_MKVDIR_ERR;
}
sprintf(buf, ext_command[ftype], dir1);
WaitCursor();
if((pfp = popen(buf, "r")) == NULL) {
SetISTR(ISTR_INFO, "fail to extract archive '%s'.",
BaseName(dir2));
Warning();
goto VD_MKVDIR_ERR;
}
while (1) {
if (fread(buf1, 1, sizeof(buf1), pfp) < sizeof(buf1))
break;
WaitCursor();
}
if (!feof(pfp)) {
SetISTR(ISTR_INFO, "Pipe was broken.");
Warning();
pclose(pfp);
goto VD_MKVDIR_ERR;
}
pclose(pfp);
if (strcmp(dir1, dir2))
unlink(dir1);
vd_addvdtable(dir2);
Dirtovd(origdir);
chdir(origdir);
SetCursors(-1);
return 0;
VD_MKVDIR_ERR:
if (strcmp(dir1, dir2))
unlink(dir1);
SetCursors(-1);
return VD_ERR;
}
}
SetCursors(-1);
return VD_ERR;
}
#ifdef VIRTUAL_TD
void Mkvdir_force(dir)
char *dir;
{
char tmp[MAXPATHLEN+1];
if (vdcount >= VD_VDTABLESIZE) {
ErrPopUp("Sorry, you can't make virtual directory any more.",
"\nBummer!");
return;
}
sprintf(tmp, "%s%s", vdroot, dir);
if (vd_recursive_mkdir(tmp)) {
SetISTR(ISTR_INFO, "Failed to make virtual directory.");
Warning();
return;
}
vd_addvdtable(dir);
}
#endif /* VIRTUAL_TD */
/*
* These functions remove virtual directory, if exists.
* Rmvdir:
* front interface of vd_Rmvdir.
* vd_Rmvdir:
* remove virtual directory function.
*/
int Rmvdir(dir)
char *dir;
{
int rv;
char buf[MAXPATHLEN+1];
strcpy(buf, dir);
vd_optimize_path(buf);
rv = vd_Rmvdir(buf);
vd_packvdtable();
return rv;
}
static int vd_Rmvdir(dir)
char *dir;
{
int i;
char tmp[MAXPATHLEN+1];
for(i = 0; i < vdcount; i++)
if (!strncmp(dir, vdtable[i], strlen(dir))) {
sprintf(tmp, "%s%s", vdroot, vdtable[i]);
if (vd_Rmvdir(tmp))
return 1;
if (vd_recursive_rmdir(tmp))
return 1;
vdtable[i][0] = '\0';
}
return 0;
}
/*
* These functions move virtual directory, if exists.
* Movevdir:
* front interface of move virtual directory function.
* vd_Movevdir:
* does real work.
*/
int Movevdir(src, dst)
char *src, *dst;
{
/*
char sbuf[MAXPATHLEN+1], dbuf[MAXPATHLEN+1];
strcpy(sbuf, src);
vd_optimize_path(sbuf);
strcpy(dbuf, dst);
vd_optimize_path(dbuf);
return (vd_Movevdir(sbuf, dbuf));
*/
return (vd_Movevdir(src, dst));
}
static int vd_Movevdir(src, dst)
char *src, *dst;
{
int i;
char *p, *pp;
char tmp[MAXPATHLEN+1], tmps[MAXPATHLEN+1], tmpd[MAXPATHLEN+1];
for (i = 0; i < vdcount; i++)
if (!strncmp(src, vdtable[i], strlen(src))) {
sprintf(tmps, "%s%s", vdroot, vdtable[i]);
sprintf(tmp, "%s%s", dst, vdtable[i]+strlen(src));
sprintf(tmpd, "%s%s", vdroot, tmp);
if (vd_Movevdir(tmps, tmpd))
return 1;
pp = vdtable[i];
p = (char *) malloc(strlen(tmp)+1);
strcpy(p, tmp);
vdtable[i] = p;
strcpy(tmp, tmpd);
for (p = tmp+strlen(tmp); *p != '/'; p--)
;
*p = '\0';
if (vd_recursive_mkdir(tmp))
goto VD_MOVEVDIR_ERR;
if (rename(tmps, tmpd) < 0)
goto VD_MOVEVDIR_ERR;
free(pp);
}
return 0;
VD_MOVEVDIR_ERR:
free(vdtable[i]);
vdtable[i] = pp;
return 1;
}
/*
* These functions handle table of virtual directories.
* vd_addvdtable:
* adds virtual directory to table.
* vd_packvdtable:
* removes disused virtual directories from table.
*/
static void vd_addvdtable(vd)
char *vd;
{
char *p;
p = (char *) malloc(strlen(vd)+1);
strcpy(p, vd);
vdtable[vdcount] = p;
vdcount++;
}
static void vd_packvdtable()
{
int i, j;
for (i = j = 0; i < vdcount; i++)
if (vdtable[i][0] != '\0')
vdtable[j++] = vdtable[i];
else
free(vdtable[i]);
vdcount = j;
}
/*
* These are utility functions.
* vd_recursive_mkdir:
* makes directories recursively.
* vd_recursive_rmdir
* removes directories recursively.
*/
static int vd_recursive_mkdir(dir)
char *dir;
{
char buf[MAXPATHLEN+1], *p;
struct stat st;
strcpy(buf, dir);
if (buf[strlen(buf) - 1] == '/')
buf[strlen(buf) - 1] = '\0';
p = rindex(buf, '/');
*p = '\0';
if (stat(buf, &st) < 0)
if (vd_recursive_mkdir(buf) < 0)
return (-1);
*p = '/';
if (mkdir(buf, 0700) < 0)
return (-1);
return (0);
}
static int vd_recursive_rmdir(dir)
char *dir;
{
char buf[MAXPATHLEN+1], buf2[MAXPATHLEN+1];
DIR *dp;
struct dirent *di;
strcpy(buf, dir);
if (buf[strlen(buf) - 1] == '/')
buf[strlen(buf) - 1] = '\0';
if ((dp = opendir(buf)) == NULL)
return (-1);
while ((di = readdir(dp)) != NULL) {
struct stat st;
if (!strcmp(di->d_name, ".") || !strcmp(di->d_name, ".."))
continue;
sprintf(buf2, "%s/%s", dir, di->d_name);
stat(buf2, &st);
if (S_ISDIR(st.st_mode)) {
if (vd_recursive_rmdir(buf2) < 0)
goto VD_RECURSIVE_RMDIR_ERR;
} else
unlink(buf2);
}
if (rmdir(buf) < 0)
goto VD_RECURSIVE_RMDIR_ERR;
closedir(dp);
return (0);
VD_RECURSIVE_RMDIR_ERR:
closedir(dp);
return (-1);
}
/*
* These functions test specified path.
* Isarchive:
* tests whether it's an archive?
* Isvdir:
* tests whether it's in the virtual directory?
*/
int Isarchive(path)
char *path;
{
int ftype;
if ((ftype = vd_ftype(path)) < 0)
return 0;
if (ftype == RFT_COMPRESS)
if (!(ftype = vd_compp(path, NULL)))
return 0;
return ftype;
}
int Isvdir(path)
char *path;
{
int rv = 0;
char tmp1[MAXPATHLEN+1], tmp2[MAXPATHLEN+1];
int archive1, archive2;
strcpy(tmp1, path);
strcpy(tmp2, path);
vd_optimize_path(tmp1);
Dirtovd(tmp2);
archive1 = Isarchive(tmp1);
archive2 = Isarchive(tmp2);
if (strcmp(tmp1, tmp2)) {
char tmp3[MAXPATHLEN+1], tmp4[MAXPATHLEN+1];
int archive3, archive4;
sprintf(tmp3, "%s%s", vdroot, tmp1);
strcpy(tmp4, tmp2+strlen(vdroot));
archive3 = Isarchive(tmp3);
archive4 = Isarchive(tmp4);
if (archive4 && !strcmp(tmp1, tmp4)) {
rv |= 06;
return rv;
}
rv |= 01;
if (archive2)
rv |= 02;
else if (archive4)
rv |= 06;
return rv;
}
if (archive1)
rv |= 02;
return rv;
}
/*
* This function optimizes given path.
* Expand '~' to home directory and removes '.', and treat '..'.
*/
static void vd_optimize_path(path)
char *path;
{
char *tmp, *reserve;
if (!strcmp(path, STDINSTR))
return;
if (*path == '\0') {
xv_getwd(path, MAXPATHLEN+1);
return;
}
if (*path == '~')
Globify(path);
if (*path != '/') {
char tmp[MAXPATHLEN+1];
strcpy(tmp, path);
xv_getwd(path, MAXPATHLEN+1);
strcat(path, "/");
strcat(path, tmp);
}
reserve = tmp = path;
while(*path != '\0') {
if (*path == '/') {
*tmp++ = *path;
while (*++path == '/')
;
continue;
}
if ((*path == '.') && (*(path-1) == '/')) {
if (*(path+1) == '/') {
tmp--;
path++;
continue;
} else if (*(path+1) == '\0') {
tmp--;
break;
} else if (*(path+1) == '.') {
if (*(path+2) == '/') {
if ((tmp - reserve) > 1)
for (tmp-=2; (*tmp != '/'); tmp--)
;
else
tmp = reserve;
path+=2;
continue;
} else if (*(path+2) == '\0') {
if ((tmp - reserve) > 1)
for (tmp-=2; (*tmp != '/'); tmp--)
;
else
tmp = reserve+1;
break;
}
}
}
*tmp++ = *path++;
}
if (((tmp - reserve) > 1) && *(tmp-1) == '/')
tmp--;
if (tmp == reserve)
*tmp++ = '/';
*tmp = '\0';
}
/*
* These functions detect file type.
*/
static int vd_ftype(fname)
char *fname;
{
/* check archive type */
FILE *fp;
byte magicno[30]; /* first 30 bytes of file */
int rv, n;
struct stat st;
if (!fname) return VD_ERR; /* shouldn't happen */
if ((!stat(fname, &st)) && (st.st_mode & S_IFMT) == S_IFDIR)
return VD_UKN;
fp = xv_fopen(fname, "r");
if (!fp) return VD_ERR;
n = fread(magicno, (size_t) 1, (size_t) 30, fp);
fclose(fp);
if (n<30) return VD_UKN; /* files less than 30 bytes long... */
rv = VD_UKN;
if (magicno[0] == 0x60 && magicno[1]==0xea) rv = VD_ARJ;
else if (magicno[2] == '-' && magicno[3] == 'l' &&
magicno[4] == 'h') rv = VD_LZH;
else if (strncmp((char *) magicno,"PK", (size_t) 2)==0) rv = VD_ZIP;
else if (magicno[20]==0xdc && magicno[21]==0xa7 &&
magicno[22]==0xc4 && magicno[23]==0xfd) rv = VD_ZOO;
else if (vd_tarc(fname)) rv = VD_TAR;
else if (magicno[0]==0x1f && magicno[1]==0x9d) rv = RFT_COMPRESS;
else if (!strncmp((char *) &magicno[11], "MAJYO", (size_t) 5))
rv = VD_UKN; /* XXX */
else if (magicno[0] == 26) rv = VD_ARC;
#ifdef GUNZIP
else if (magicno[0]==0x1f && magicno[1]==0x8b) rv = RFT_COMPRESS;/* gzip */
else if (magicno[0]==0x1f && magicno[1]==0x9e) rv = RFT_COMPRESS;/* old */
else if (magicno[0]==0x1f && magicno[1]==0x1e) rv = RFT_COMPRESS;/* pack */
#endif
return rv;
}
static int vd_compp(path, newpath)
char *path, *newpath;
{
/*
* uncompress and check archive type.
*
* If newpath is NULL, uncompress only 512 byte of 'path' and
* check archive type, so it is for SPEED-UP strategy.
* In this case, caller this function does not have to unlink
* tempoary file.
* Unfortunately it does not work in VMS system.
*/
int file_type, r;
char uncompname[128], basename[128];
int comptype;
if (newpath) *newpath = '\0';
strncpy(basename, path, 127);
comptype = ReadFileType(path);
#if (defined(VMS) && !defined(GUNZIP))
/* VMS decompress doesn't like the file to have a trailing .Z in fname
however, GUnZip is OK with it, which we are calling UnCompress */
*rindex (basename, '.') = '\0';
#endif
#ifdef VMS
if (UncompressFile(basename, uncompname)) {
#else
if (newpath == NULL)
r = vd_UncompressFile(basename, uncompname);
else
r = UncompressFile(basename, uncompname, comptype);
if (r) {
#endif
if ((file_type = vd_ftype(uncompname)) < 0) {
unlink(uncompname);
return 0;
}
if (newpath) strcpy(newpath, uncompname);
else unlink(uncompname);
} else {
return 0;
}
return file_type;
}
#define HEADERSIZE 512
static void vd_Dirtovd PARM((char *));
static int stderr_on PARM((void));
static int stderr_off PARM((void));
static FILE *popen_nul PARM((char *, char *));
static int vd_UncompressFile(name, uncompname)
char *name, *uncompname;
{
/* Yap, I`m nearly same as original `UncompnameFile' function, but,
1) I extract `name' file ONLY first 512 byte.
2) I'm called only from UNIX and UNIX like OS, *NOT* VMS */
/* returns '1' on success, with name of uncompressed file in uncompname
returns '0' on failure */
char namez[128], *fname, buf[512], tmp[HEADERSIZE];
int n, tmpfd;
FILE *pfp, *tfp;
fname = name;
namez[0] = '\0';
#ifndef GUNZIP
/* see if compressed file name ends with '.Z'. If it *doesn't*, we need
to temporarily rename it so it *does*, uncompress it, and rename it
*back* to what it was. necessary because uncompress doesn't handle
files that don't end with '.Z' */
if (strlen(name) >= (size_t) 2 &&
strcmp(name + strlen(name)-2,".Z")!=0 &&
strcmp(name + strlen(name)-2,".z")!=0) {
strcpy(namez, name);
strcat(namez,".Z");
if (rename(name, namez) < 0) {
sprintf(buf, "Error renaming '%s' to '%s': %s",
name, namez, ERRSTR(errno));
ErrPopUp(buf, "\nBummer!");
return 0;
}
fname = namez;
}
#endif /* not GUNZIP */
sprintf(uncompname, "%s/xvuXXXXXX", tmpdir);
#ifdef USE_MKSTEMP
tmpfd = mkstemp(uncompname);
#else
mktemp(uncompname);
#endif
/* FIXME: need to escape any special characters (spaces, dollar signs,
* backticks, quotes, etc., or use ticks) in the filename before calling system().
* Maybe one of the exec() variants would be better...
* (and why can't this be merged with the similar code in xv.c?)
*/
sprintf(buf,"%s -c %s", UNCOMPRESS, fname);
SetISTR(ISTR_INFO, "Uncompressing Header '%s'...", BaseName(fname));
if ((pfp = popen_nul(buf, "r")) == NULL) {
SetISTR(ISTR_INFO, "Cannot extract for archive '%s'.",
BaseName(fname));
Warning();
#ifdef USE_MKSTEMP
if (tmpfd >= 0)
close(tmpfd);
#endif
return 0;
}
#ifdef USE_MKSTEMP
if (tmpfd < 0)
#else
if ((tmpfd = open(uncompname,O_WRONLY|O_CREAT|O_EXCL,S_IRWUSR)) < 0)
#endif
{
SetISTR(ISTR_INFO, "Unable to create temporary file.",
BaseName(uncompname));
Warning();
pclose(pfp);
}
if ((tfp = fdopen(tmpfd, "w")) == NULL) {
SetISTR(ISTR_INFO, "Unable to create temporary file.",
BaseName(uncompname));
Warning();
close(tmpfd);
pclose(pfp);
return 0;
}
if ((n = fread(tmp, 1, sizeof(tmp), pfp)) != HEADERSIZE) {
SetISTR(ISTR_INFO, "Unable to read '%s'.",
BaseName(fname));
Warning();
pclose(pfp);
fflush(tfp);
fclose(tfp);
close(tmpfd);
return 0;
}
fwrite(tmp, 1, n, tfp);
fflush(tfp);
fclose(tfp);
close(tmpfd);
pclose(pfp);
/* if we renamed the file to end with a .Z for the sake of 'uncompress',
rename it back to what it once was... */
if (strlen(namez)) {
if (rename(namez, name) < 0) {
sprintf(buf, "Error renaming '%s' to '%s': %s",
namez, name, ERRSTR(errno));
ErrPopUp(buf, "\nBummer!");
}
}
return 1;
}
#define TARBLOCK 512
#define CKSTART 148 /* XXX */
#define CKSIZE 8
/*
* Tar file: 1, other: 0
*/
static int vd_tarc(fname)
char *fname;
{
FILE *fp;
unsigned int sum;
char *ckp, buf[TARBLOCK];
if ((fp = fopen(fname, "r")) == NULL)
return 0;
fread(buf, TARBLOCK, 1, fp);
fclose(fp);
for (sum = 0, ckp = buf + CKSTART;
(ckp < buf + CKSTART + CKSIZE) && *ckp != '\0';
ckp++) {
sum *= 8;
if (*ckp == ' ')
continue;
if (*ckp < '0' || '7' < *ckp)
return 0;
sum += *ckp - '0';
}
if (sum != vd_tar_sumchk(buf))
return 0;
return 1;
}
static unsigned int vd_tar_sumchk(buf)
char *buf;
{
int i;
unsigned int sum = 0;
for (i = 0; i < CKSTART; i++) {
sum += *(buf + i);
}
sum += ' ' * 8;
for (i += 8; i < TARBLOCK; i++) {
sum += *(buf + i);
}
return sum;
}
static int stde = -1; /* fd of stderr */
static int nul = -1; /* fd of /dev/null */
/*
* switch off the output to stderr(bypass to /dev/null).