must flush stderr before reading from the terminal

[unix-history] / usr / src / sbin / restore / utilities.c

/* Copyright (c) 1983 Regents of the University of California */

#ifndef lint
static char sccsid[] = "@(#)utilities.c	3.12	(Berkeley)	83/05/06";
#endif

#include "restore.h"

/*
 * Insure that all the components of a pathname exist.
 */
pathcheck(name)
	char *name;
{
	register char *cp;
	struct entry *ep;
	char *start;

	start = index(name, '/');
	if (start == 0)
		return;
	for (cp = start; *cp != '\0'; cp++) {
		if (*cp != '/')
			continue;
		*cp = '\0';
		ep = lookupname(name);
		if (ep == NIL) {
			ep = addentry(name, psearch(name), NODE);
			newnode(ep);
			ep->e_flags |= NEW|KEEP;
		}
		*cp = '/';
	}
}

/*
 * Change a name to a unique temporary name.
 */
mktempname(ep)
	register struct entry *ep;
{
	char oldname[MAXPATHLEN];

	if (ep->e_flags & TMPNAME)
		badentry(ep, "mktempname: called with TMPNAME");
	ep->e_flags |= TMPNAME;
	(void) strcpy(oldname, myname(ep));
	freename(ep->e_name);
	ep->e_name = savename(gentempname(ep));
	ep->e_namlen = strlen(ep->e_name);
	renameit(oldname, myname(ep));
}

/*
 * Generate a temporary name for an entry.
 */
char *
gentempname(ep)
	struct entry *ep;
{
	static char name[MAXPATHLEN];
	struct entry *np;
	long i = 0;

	for (np = lookupino(ep->e_ino); np != NIL && np != ep; np = np->e_links)
		i++;
	if (np == NIL)
		badentry(ep, "not on ino list");
	(void) sprintf(name, "%s%d%d", TMPHDR, i, ep->e_ino);
	return (name);
}

/*
 * Rename a file or directory.
 */
renameit(from, to)
	char *from, *to;
{
	if (rename(from, to) < 0) {
		fprintf(stderr, "Warning: cannot rename %s to %s\n", from, to);
		perror("rename");
		return;
	}
	vprintf(stdout, "rename %s to %s\n", from, to);
}

/*
 * Create a new node (directory).
 */
newnode(np)
	struct entry *np;
{
	char *cp;

	if (np->e_type != NODE)
		badentry(np, "newnode: not a node");
	cp = myname(np);
	if (mkdir(cp, 0777) < 0) {
		fprintf(stderr, "Warning: ");
		(void) fflush(stderr);
		perror(cp);
		return;
	}
	vprintf(stdout, "Make node %s\n", cp);
}

/*
 * Remove an old node (directory).
 */
removenode(ep)
	register struct entry *ep;
{
	char *cp;

	if (ep->e_type != NODE)
		badentry(ep, "removenode: not a node");
	if (ep->e_entries != NIL)
		badentry(ep, "removenode: non-empty directory");
	ep->e_flags |= REMOVED;
	ep->e_flags &= ~TMPNAME;
	cp = myname(ep);
	if (rmdir(cp) < 0) {
		fprintf(stderr, "Warning: ");
		(void) fflush(stderr);
		perror(cp);
		return;
	}
	vprintf(stdout, "Remove node %s\n", cp);
}

/*
 * Remove a leaf.
 */
removeleaf(ep)
	register struct entry *ep;
{
	char *cp;

	if (ep->e_type != LEAF)
		badentry(ep, "removeleaf: not a leaf");
	ep->e_flags |= REMOVED;
	ep->e_flags &= ~TMPNAME;
	cp = myname(ep);
	if (unlink(cp) < 0) {
		fprintf(stderr, "Warning: ");
		(void) fflush(stderr);
		perror(cp);
		return;
	}
	vprintf(stdout, "Remove leaf %s\n", cp);
}

/*
 * Create a link.
 */
linkit(existing, new, type)
	char *existing, *new;
	int type;
{

	if (type == SYMLINK) {
		if (symlink(existing, new) < 0) {
			fprintf(stderr,
				"Warning: cannot create symbolic link %s->%s\n",
				new, existing);
			perror("symlink");
			return;
		}
	} else if (type == HARDLINK) {
		if (link(existing, new) < 0) {
			fprintf(stderr,
				"Warning: cannot create hard link %s->%s\n",
				new, existing);
			perror("link");
			return;
		}
	} else {
		panic("linkit: unknown type %d\n", type);
	}
	vprintf(stdout, "Create %s link %s->%s\n",
		type == SYMLINK ? "symbolic" : "hard", new, existing);
}

/*
 * find lowest number file (above "start") that needs to be extracted
 */
ino_t
lowerbnd(start)
	ino_t start;
{
	register struct entry *ep;

	for ( ; start < maxino; start++) {
		ep = lookupino(start);
		if (ep == NIL || ep->e_type == NODE)
			continue;
		if (ep->e_flags & (NEW|EXTRACT))
			return (start);
	}
	return (start);
}

/*
 * find highest number file (below "start") that needs to be extracted
 */
ino_t
upperbnd(start)
	ino_t start;
{
	register struct entry *ep;

	for ( ; start > ROOTINO; start--) {
		ep = lookupino(start);
		if (ep == NIL || ep->e_type == NODE)
			continue;
		if (ep->e_flags & (NEW|EXTRACT))
			return (start);
	}
	return (start);
}

/*
 * report on a badly formed entry
 */
badentry(ep, msg)
	register struct entry *ep;
	char *msg;
{

	fprintf(stderr, "bad entry: %s\n", msg);
	fprintf(stderr, "name: %s\n", myname(ep));
	fprintf(stderr, "parent name %s\n", myname(ep->e_parent));
	if (ep->e_sibling != NIL)
		fprintf(stderr, "sibling name: %s\n", myname(ep->e_sibling));
	if (ep->e_entries != NIL)
		fprintf(stderr, "next entry name: %s\n", myname(ep->e_entries));
	if (ep->e_links != NIL)
		fprintf(stderr, "next link name: %s\n", myname(ep->e_links));
	if (ep->e_next != NIL)
		fprintf(stderr, "next hashchain name: %s\n", myname(ep->e_next));
	fprintf(stderr, "entry type: %s\n",
		ep->e_type == NODE ? "NODE" : "LEAF");
	fprintf(stderr, "inode number: %ld\n", ep->e_ino);
	panic("flags: %s\n", flagvalues(ep));
}

/*
 * Construct a string indicating the active flag bits of an entry.
 */
char *
flagvalues(ep)
	register struct entry *ep;
{
	static char flagbuf[BUFSIZ];

	(void) strcpy(flagbuf, "|NIL");
	flagbuf[0] = '\0';
	if (ep->e_flags & REMOVED)
		(void) strcat(flagbuf, "|REMOVED");
	if (ep->e_flags & TMPNAME)
		(void) strcat(flagbuf, "|TMPNAME");
	if (ep->e_flags & EXTRACT)
		(void) strcat(flagbuf, "|EXTRACT");
	if (ep->e_flags & NEW)
		(void) strcat(flagbuf, "|NEW");
	if (ep->e_flags & KEEP)
		(void) strcat(flagbuf, "|KEEP");
	return (&flagbuf[1]);
}

/*
 * Check to see if a name is on a dump tape.
 */
ino_t
dirlookup(name)
	char *name;
{
	ino_t ino;

	ino = psearch(name);
	if (ino == 0 || BIT(ino, dumpmap) == 0)
		fprintf(stderr, "%s is not on tape\n", name);
	return (ino);
}

/*
 * Canonicalize file names to always start with ``./'' and
 * remove any imbedded ".." components.
 */
canon(rawname, canonname)
	char *rawname, *canonname;
{
	register char *cp, *np;
	int len;

	if (strcmp(rawname, ".") == 0 || strncmp(rawname, "./", 2) == 0)
		(void) strcpy(canonname, "");
	else if (rawname[0] == '/')
		(void) strcpy(canonname, ".");
	else
		(void) strcpy(canonname, "./");
	(void) strcat(canonname, rawname);
	len = strlen(canonname) - 1;
	if (canonname[len] == '/')
		canonname[len] = '\0';
	/*
	 * Eliminate extraneous ".." from pathnames.
	 */
	for (np = canonname; *np != '\0'; ) {
		np++;
		cp = np;
		while (*np != '/' && *np != '\0')
			np++;
		if (np - cp == 2 && strncmp(cp, "..", 2) == 0) {
			cp--;
			while (cp > &canonname[1] && *--cp != '/')
				/* find beginning of name */;
			(void) strcpy(cp, np);
			np = cp;
		}
	}
}

/*
 * Elicit a reply.
 */
reply(question)
	char *question;
{
	char c;

	fprintf(stderr, "%s? ", question);
	do	{
		fprintf(stderr, "[yn] ");
		fflush(stderr);
		c = getc(terminal);
		while (c != '\n' && getc(terminal) != '\n')
			/* void */;
	} while (c != 'y' && c != 'n');
	if (c == 'y')
		return (GOOD);
	return (FAIL);
}

/*
 * Read and parse an interactive command.
 * The first word on the line is assigned to "cmd". If
 * there are no arguments on the command line, then "curdir"
 * is returned as the argument. If there are arguments
 * on the line they are returned one at a time on each
 * successive call to getcmd. Each argument is first assigned
 * to "name". If it does not start with "/" the pathname in
 * "curdir" is prepended to it. Finally "canon" is called to
 * eliminate any embedded ".." components.
 */
getcmd(curdir, cmd, name)
	char *curdir, *cmd, *name;
{
	register char *cp, *bp;
	char output[BUFSIZ];
	static char input[BUFSIZ];
	static char *nextarg = NULL;

	/*
	 * Check to see if still processing arguments.
	 */
	if (nextarg != NULL)
		goto getnext;
	nextarg = NULL;
	/*
	 * Read a command line and trim off trailing white space.
	 */
	do	{
		fprintf(stderr, "restore > ");
		(void) fflush(stderr);
		(void) fgets(input, BUFSIZ, terminal);
	} while (!feof(terminal) && input[0] == '\n');
	if (feof(terminal)) {
		(void) strcpy(cmd, "quit");
		return;
	}
	for (cp = &input[strlen(input) - 2]; *cp == ' ' || *cp == '\t'; cp--)
		/* trim off trailing white space and newline */;
	*++cp = '\0';
	/*
	 * Copy the command into "cmd".
	 */
	for (cp = input; *cp == ' ' || *cp == '\t'; cp++)
		/* skip to command */;
	for (bp = cmd; *cp != ' ' && *cp != '\t' && *cp != '\0'; )
		*bp++ = *cp++;
	*bp = '\0';
	/*
	 * If no argument, use curdir as the default.
	 */
	if (*cp == '\0') {
		(void) strcpy(name, curdir);
		return;
	}
	nextarg = cp;
	/*
	 * Find the next argument.
	 */
getnext:
	for (cp = nextarg + 1; *cp == ' ' || *cp == '\t'; cp++)
		/* skip to argument */;
	for (bp = cp; *cp != ' ' && *cp != '\t' && *cp != '\0'; cp++)
		/* skip to end of argument */;
	if (*cp == '\0')
		nextarg = NULL;
	else
		nextarg = cp;
	*cp = '\0';
	/*
	 * If it an absolute pathname, canonicalize it and return it.
	 */
	if (*bp == '/') {
		canon(bp, name);
		return;
	}
	/*
	 * For relative pathnames, prepend the current directory to
	 * it then canonicalize and return it.
	 */
	(void) strcpy(output, curdir);
	(void) strcat(output, "/");
	(void) strcat(output, bp);
	canon(output, name);
}

/*
 * respond to interrupts
 */
onintr()
{
	if (reply("restore interrupted, continue") == FAIL)
		done(1);
	if (signal(SIGINT, onintr) == SIG_IGN)
		(void) signal(SIGINT, SIG_IGN);
	if (signal(SIGTERM, onintr) == SIG_IGN)
		(void) signal(SIGTERM, SIG_IGN);
}

/*
 * handle unexpected inconsistencies
 */
/* VARARGS1 */
panic(msg, d1, d2)
	char *msg;
	long d1, d2;
{

	fprintf(stderr, msg, d1, d2);
	if (reply("abort") == GOOD) {
		if (reply("dump core") == GOOD)
			abort();
		done(1);
	}
}