ref: d1cebf608b05e45b148108ac6c16ae94f6862097
dir: /sys/src/ape/cmd/pax/fileio.c/
/* $Source: /u/mark/src/pax/RCS/fileio.c,v $
*
* $Revision: 1.2 $
*
* fileio.c - file I/O functions for all archive interfaces
*
* DESCRIPTION
*
* These function all do I/O of some form or another. They are
* grouped here mainly for convienence.
*
* AUTHOR
*
* Mark H. Colburn, NAPS International (mark@jhereg.mn.org)
*
* Sponsored by The USENIX Association for public distribution.
*
* Copyright (c) 1989 Mark H. Colburn.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice is duplicated in all such
* forms and that any documentation, advertising materials, and other
* materials related to such distribution and use acknowledge that the
* software was developed * by Mark H. Colburn and sponsored by The
* USENIX Association.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Log: fileio.c,v $
* Revision 1.2 89/02/12 10:04:31 mark
* 1.2 release fixes
*
* Revision 1.1 88/12/23 18:02:09 mark
* Initial revision
*
*/
#ifndef lint
static char *ident = "$Id: fileio.c,v 1.2 89/02/12 10:04:31 mark Exp $";
static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";
#endif /* ! lint */
/* Headers */
#include "pax.h"
/* open_archive - open an archive file.
*
* DESCRIPTION
*
* Open_archive will open an archive file for reading or writing,
* setting the proper file mode, depending on the "mode" passed to
* it. All buffer pointers are reset according to the mode
* specified.
*
* PARAMETERS
*
* int mode - specifies whether we are reading or writing.
*
* RETURNS
*
* Returns a zero if successfull, or -1 if an error occured during
* the open.
*/
#ifdef __STDC__
int open_archive(int mode)
#else
int open_archive(mode)
int mode;
#endif
{
if (ar_file[0] == '-' && ar_file[1] == '\0') {
if (mode == AR_READ) {
archivefd = STDIN;
bufend = bufidx = bufstart;
} else {
archivefd = STDOUT;
}
} else if (mode == AR_READ) {
archivefd = open(ar_file, O_RDONLY | O_BINARY);
bufend = bufidx = bufstart; /* set up for initial read */
} else if (mode == AR_WRITE) {
archivefd = open(ar_file, O_WRONLY|O_TRUNC|O_CREAT|O_BINARY, 0666);
} else if (mode == AR_APPEND) {
archivefd = open(ar_file, O_RDWR | O_BINARY, 0666);
bufend = bufidx = bufstart; /* set up for initial read */
}
if (archivefd < 0) {
warnarch(strerror(), (OFFSET) 0);
return (-1);
}
++arvolume;
return (0);
}
/* close_archive - close the archive file
*
* DESCRIPTION
*
* Closes the current archive and resets the archive end of file
* marker.
*/
#ifdef __STDC__
void close_archive(void)
#else
void close_archive()
#endif
{
if (archivefd != STDIN && archivefd != STDOUT) {
close(archivefd);
}
areof = 0;
}
/* openout - open an output file
*
* DESCRIPTION
*
* Openo opens the named file for output. The file mode and type are
* set based on the values stored in the stat structure for the file.
* If the file is a special file, then no data will be written, the
* file/directory/Fifo, etc., will just be created. Appropriate
* permission may be required to create special files.
*
* PARAMETERS
*
* char *name - The name of the file to create
* Stat *asb - Stat structure for the file
* Link *linkp; - pointer to link chain for this file
* int ispass - true if we are operating in "pass" mode
*
* RETURNS
*
* Returns the output file descriptor, 0 if no data is required or -1
* if unsuccessful. Note that UNIX open() will never return 0 because
* the standard input is in use.
*/
#ifdef __STDC__
int openout(char *name, Stat *asb, Link *linkp, int ispass)
#else
int openout(name, asb, linkp, ispass)
char *name;
Stat *asb;
Link *linkp;
int ispass;
#endif
{
int exists;
int fd;
ushort perm;
ushort operm = 0;
Stat osb;
#ifdef S_IFLNK
int ssize;
char sname[PATH_MAX + 1];
#endif /* S_IFLNK */
if (exists = (LSTAT(name, &osb) == 0)) {
if (ispass && osb.sb_ino == asb->sb_ino && osb.sb_dev == asb->sb_dev) {
warn(name, "Same file");
return (-1);
} else if ((osb.sb_mode & S_IFMT) == (asb->sb_mode & S_IFMT)) {
operm = osb.sb_mode & S_IPERM;
} else if (REMOVE(name, &osb) < 0) {
warn(name, strerror());
return (-1);
} else {
exists = 0;
}
}
if (linkp) {
if (exists) {
if (asb->sb_ino == osb.sb_ino && asb->sb_dev == osb.sb_dev) {
return (0);
} else if (unlink(name) < 0) {
warn(name, strerror());
return (-1);
} else {
exists = 0;
}
}
if (link(linkp->l_name, name) != 0) {
if (errno == ENOENT) {
if (f_dir_create) {
if (dirneed(name) != 0 ||
link(linkp->l_name, name) != 0) {
warn(name, strerror());
return (-1);
}
} else {
warn(name,
"Directories are not being created (-d option)");
}
return(0);
} else if (errno != EXDEV) {
warn(name, strerror());
return (-1);
}
} else {
return(0);
}
}
perm = asb->sb_mode & S_IPERM;
switch (asb->sb_mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
#ifdef _POSIX_SOURCE
warn(name, "Can't create special files");
return (-1);
#else
fd = 0;
if (exists) {
if (asb->sb_rdev == osb.sb_rdev) {
if (perm != operm && chmod(name, (int) perm) < 0) {
warn(name, strerror());
return (-1);
} else {
break;
}
} else if (REMOVE(name, &osb) < 0) {
warn(name, strerror());
return (-1);
} else {
exists = 0;
}
}
if (mknod(name, (int) asb->sb_mode, (int) asb->sb_rdev) < 0) {
if (errno == ENOENT) {
if (f_dir_create) {
if (dirneed(name) < 0 || mknod(name, (int) asb->sb_mode,
(int) asb->sb_rdev) < 0) {
warn(name, strerror());
return (-1);
}
} else {
warn(name, "Directories are not being created (-d option)");
}
} else {
warn(name, strerror());
return (-1);
}
}
return(0);
#endif /* _POSIX_SOURCE */
break;
case S_IFDIR:
if (exists) {
if (perm != operm && chmod(name, (int) perm) < 0) {
warn(name, strerror());
return (-1);
}
} else if (f_dir_create) {
if (dirmake(name, asb) < 0 || dirneed(name) < 0) {
warn(name, strerror());
return (-1);
}
} else {
warn(name, "Directories are not being created (-d option)");
}
return (0);
#ifndef _POSIX_SOURCE
#ifdef S_IFIFO
case S_IFIFO:
fd = 0;
if (exists) {
if (perm != operm && chmod(name, (int) perm) < 0) {
warn(name, strerror());
return (-1);
}
} else if (mknod(name, (int) asb->sb_mode, 0) < 0) {
if (errno == ENOENT) {
if (f_dir_create) {
if (dirneed(name) < 0
|| mknod(name, (int) asb->sb_mode, 0) < 0) {
warn(name, strerror());
return (-1);
}
} else {
warn(name, "Directories are not being created (-d option)");
}
} else {
warn(name, strerror());
return (-1);
}
}
return(0);
break;
#endif /* S_IFIFO */
#endif /* _POSIX_SOURCE */
#ifdef S_IFLNK
case S_IFLNK:
if (exists) {
if ((ssize = readlink(name, sname, sizeof(sname))) < 0) {
warn(name, strerror());
return (-1);
} else if (strncmp(sname, asb->sb_link, ssize) == 0) {
return (0);
} else if (REMOVE(name, &osb) < 0) {
warn(name, strerror());
return (-1);
} else {
exists = 0;
}
}
if (symlink(asb->sb_link, name) < 0) {
if (errno == ENOENT) {
if (f_dir_create) {
if (dirneed(name) < 0 || symlink(asb->sb_link, name) < 0) {
warn(name, strerror());
return (-1);
}
} else {
warn(name, "Directories are not being created (-d option)");
}
} else {
warn(name, strerror());
return (-1);
}
}
return (0); /* Can't chown()/chmod() a symbolic link */
#endif /* S_IFLNK */
case S_IFREG:
if (exists) {
if (!f_unconditional && osb.sb_mtime > asb->sb_mtime) {
warn(name, "Newer file exists");
return (-1);
} else if (unlink(name) < 0) {
warn(name, strerror());
return (-1);
} else {
exists = 0;
}
}
if ((fd = creat(name, (int) perm)) < 0) {
if (errno == ENOENT) {
if (f_dir_create) {
if (dirneed(name) < 0 ||
(fd = creat(name, (int) perm)) < 0) {
warn(name, strerror());
return (-1);
}
} else {
/*
* the file requires a directory which does not exist
* and which the user does not want created, so skip
* the file...
*/
warn(name, "Directories are not being created (-d option)");
return(0);
}
} else {
warn(name, strerror());
return (-1);
}
}
break;
default:
warn(name, "Unknown filetype");
return (-1);
}
if (f_owner) {
if (!exists || asb->sb_uid != osb.sb_uid || asb->sb_gid != osb.sb_gid) {
chown(name, (int) asb->sb_uid, (int) asb->sb_gid);
}
}
return (fd);
}
/* openin - open the next input file
*
* DESCRIPTION
*
* Openi will attempt to open the next file for input. If the file is
* a special file, such as a directory, FIFO, link, character- or
* block-special file, then the file size field of the stat structure
* is zeroed to make sure that no data is written out for the file.
* If the file is a special file, then a file descriptor of 0 is
* returned to the caller, which is handled specially. If the file
* is a regular file, then the file is opened and a file descriptor
* to the open file is returned to the caller.
*
* PARAMETERS
*
* char *name - pointer to the name of the file to open
* Stat *asb - pointer to the stat block for the file to open
*
* RETURNS
*
* Returns a file descriptor, 0 if no data exists, or -1 at EOF. This
* kludge works because standard input is in use, preventing open() from
* returning zero.
*/
#ifdef __STDC__
int openin(char *name, Stat *asb)
#else
int openin(name, asb)
char *name; /* name of file to open */
Stat *asb; /* pointer to stat structure for file */
#endif
{
int fd;
switch (asb->sb_mode & S_IFMT) {
case S_IFDIR:
asb->sb_nlink = 1;
asb->sb_size = 0;
return (0);
#ifdef S_IFLNK
case S_IFLNK:
if ((asb->sb_size = readlink(name,
asb->sb_link, sizeof(asb->sb_link) - 1)) < 0) {
warn(name, strerror());
return(0);
}
asb->sb_link[asb->sb_size] = '\0';
return (0);
#endif /* S_IFLNK */
case S_IFREG:
if (asb->sb_size == 0) {
return (0);
}
if ((fd = open(name, O_RDONLY | O_BINARY)) < 0) {
warn(name, strerror());
}
return (fd);
default:
asb->sb_size = 0;
return (0);
}
}