1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright (c) 1995 Sun Microsystems, Inc. All Rights Reserved
24*0Sstevel@tonic-gate *
25*0Sstevel@tonic-gate * module:
26*0Sstevel@tonic-gate * recon.c
27*0Sstevel@tonic-gate *
28*0Sstevel@tonic-gate * purpose:
29*0Sstevel@tonic-gate * process the reconciliation list, figure out exactly what the
30*0Sstevel@tonic-gate * changes were, and what we should do about them.
31*0Sstevel@tonic-gate *
32*0Sstevel@tonic-gate * contents:
33*0Sstevel@tonic-gate * reconcile ... (top level) process the reconciliation list
34*0Sstevel@tonic-gate * samedata .... (static) do two files have the same contents
35*0Sstevel@tonic-gate * samestuff ... (static) do two files have the same ownership/protection
36*0Sstevel@tonic-gate * samecompare . (static) actually read and compare the contents
37*0Sstevel@tonic-gate * samelink .... (static) do two symlinks have the same contents
38*0Sstevel@tonic-gate * truncated ... (static) was one of the two copies truncted
39*0Sstevel@tonic-gate * older ....... (static) which copy is older
40*0Sstevel@tonic-gate * newer ....... (static) which copy is newer
41*0Sstevel@tonic-gate * full_name ... generate a full path name for a file
42*0Sstevel@tonic-gate *
43*0Sstevel@tonic-gate * notes:
44*0Sstevel@tonic-gate * If you only study one routine in this whole program, reconcile
45*0Sstevel@tonic-gate * is that routine. Everything else is just book keeping.
46*0Sstevel@tonic-gate *
47*0Sstevel@tonic-gate * things were put onto the reconciliation list because analyze
48*0Sstevel@tonic-gate * thought that they might have changed ... but up until now
49*0Sstevel@tonic-gate * nobody has figured out what the changes really were, or even
50*0Sstevel@tonic-gate * if there really were any changes.
51*0Sstevel@tonic-gate *
52*0Sstevel@tonic-gate * queue_file has ordered the reconciliation list with directory
53*0Sstevel@tonic-gate * creations first (depth ordered) and deletions last (inversely
54*0Sstevel@tonic-gate * depth ordered). all other changes have been ordered by mod time.
55*0Sstevel@tonic-gate */
56*0Sstevel@tonic-gate #ident "%W% %E% SMI"
57*0Sstevel@tonic-gate
58*0Sstevel@tonic-gate #include <stdio.h>
59*0Sstevel@tonic-gate #include <unistd.h>
60*0Sstevel@tonic-gate #include <stdlib.h>
61*0Sstevel@tonic-gate #include <string.h>
62*0Sstevel@tonic-gate #include <fcntl.h>
63*0Sstevel@tonic-gate
64*0Sstevel@tonic-gate #include "filesync.h"
65*0Sstevel@tonic-gate #include "database.h"
66*0Sstevel@tonic-gate #include "messages.h"
67*0Sstevel@tonic-gate #include "debug.h"
68*0Sstevel@tonic-gate
69*0Sstevel@tonic-gate /*
70*0Sstevel@tonic-gate * local routines to figure out how the files really differ
71*0Sstevel@tonic-gate */
72*0Sstevel@tonic-gate static bool_t samedata(struct file *);
73*0Sstevel@tonic-gate static bool_t samestuff(struct file *);
74*0Sstevel@tonic-gate static bool_t samecompare(struct file *);
75*0Sstevel@tonic-gate static bool_t truncated(struct file *);
76*0Sstevel@tonic-gate static bool_t samelink();
77*0Sstevel@tonic-gate static side_t newer(struct file *);
78*0Sstevel@tonic-gate static side_t older(struct file *);
79*0Sstevel@tonic-gate
80*0Sstevel@tonic-gate /*
81*0Sstevel@tonic-gate * globals
82*0Sstevel@tonic-gate */
83*0Sstevel@tonic-gate char *srcname; /* file we are emulating */
84*0Sstevel@tonic-gate char *dstname; /* file we are updating */
85*0Sstevel@tonic-gate
86*0Sstevel@tonic-gate /*
87*0Sstevel@tonic-gate * routine:
88*0Sstevel@tonic-gate * reconcile
89*0Sstevel@tonic-gate *
90*0Sstevel@tonic-gate * purpose:
91*0Sstevel@tonic-gate * to perform the reconciliation action associated with a file
92*0Sstevel@tonic-gate *
93*0Sstevel@tonic-gate * parameters:
94*0Sstevel@tonic-gate * file pointer
95*0Sstevel@tonic-gate *
96*0Sstevel@tonic-gate * returns:
97*0Sstevel@tonic-gate * built up error mask
98*0Sstevel@tonic-gate * updated statistics
99*0Sstevel@tonic-gate *
100*0Sstevel@tonic-gate * notes:
101*0Sstevel@tonic-gate * The switch statement handles the obvious stuff.
102*0Sstevel@tonic-gate * The TRUE side of the samedata test handles minor differences.
103*0Sstevel@tonic-gate * The interesting stuff is in the FALSE side of the samedata test.
104*0Sstevel@tonic-gate *
105*0Sstevel@tonic-gate * The desparation heuristics (in the diffmask&CONTENTS test) are
106*0Sstevel@tonic-gate * not rigorously correct ... but they always try do the right thing
107*0Sstevel@tonic-gate * with data, and only lose mode/ownership changes in relatively
108*0Sstevel@tonic-gate * pathological cases. But I claim that the benefits outweigh the
109*0Sstevel@tonic-gate * risks, and most users will be pleased with the resulting decisions.
110*0Sstevel@tonic-gate *
111*0Sstevel@tonic-gate * Another trick is in the deletion cases of the switch. We
112*0Sstevel@tonic-gate * normally won't allow an unlink that conflicts with data
113*0Sstevel@tonic-gate * changes. If there are multiple links to the file, however,
114*0Sstevel@tonic-gate * we can make the changes and do the deletion.
115*0Sstevel@tonic-gate *
116*0Sstevel@tonic-gate * The action routines do_{remove,rename,like,copy} handle all
117*0Sstevel@tonic-gate * of their own statistics and status updating. This routine
118*0Sstevel@tonic-gate * only has to handle its own reconciliation failures (when we
119*0Sstevel@tonic-gate * can't decide what to do).
120*0Sstevel@tonic-gate */
121*0Sstevel@tonic-gate errmask_t
reconcile(struct file * fp)122*0Sstevel@tonic-gate reconcile(struct file *fp)
123*0Sstevel@tonic-gate { errmask_t errs = 0;
124*0Sstevel@tonic-gate diffmask_t diffmask;
125*0Sstevel@tonic-gate
126*0Sstevel@tonic-gate if (opt_debug & DBG_RECON)
127*0Sstevel@tonic-gate fprintf(stderr, "RECO: %s flgs=%s, mtime=%08lx.%08lx\n",
128*0Sstevel@tonic-gate fp->f_fullname,
129*0Sstevel@tonic-gate showflags(fileflags, fp->f_flags),
130*0Sstevel@tonic-gate fp->f_modtime, fp->f_modns);
131*0Sstevel@tonic-gate
132*0Sstevel@tonic-gate /*
133*0Sstevel@tonic-gate * form the fully qualified names for both files
134*0Sstevel@tonic-gate */
135*0Sstevel@tonic-gate srcname = full_name(fp, OPT_SRC, OPT_SRC);
136*0Sstevel@tonic-gate dstname = full_name(fp, OPT_DST, OPT_DST);
137*0Sstevel@tonic-gate
138*0Sstevel@tonic-gate /*
139*0Sstevel@tonic-gate * because they are so expensive to read and so troublesome
140*0Sstevel@tonic-gate * to set, we try to put off reading ACLs as long as possible.
141*0Sstevel@tonic-gate * If we haven't read them yet, we must read them now (so that
142*0Sstevel@tonic-gate * samestuff can compare them).
143*0Sstevel@tonic-gate */
144*0Sstevel@tonic-gate if (opt_acls == 0 && fp->f_info[ OPT_BASE ].f_numacls == 0) {
145*0Sstevel@tonic-gate if (get_acls(srcname, &fp->f_info[ OPT_SRC ]))
146*0Sstevel@tonic-gate fp->f_srcdiffs |= D_FACLS;
147*0Sstevel@tonic-gate if (get_acls(dstname, &fp->f_info[ OPT_DST ]))
148*0Sstevel@tonic-gate fp->f_dstdiffs |= D_FACLS;
149*0Sstevel@tonic-gate }
150*0Sstevel@tonic-gate
151*0Sstevel@tonic-gate /*
152*0Sstevel@tonic-gate * If a rename has been detected, we don't have to figure
153*0Sstevel@tonic-gate * it out, since both the rename-to and rename-from files
154*0Sstevel@tonic-gate * have already been designated. When we encounter a rename-to
155*0Sstevel@tonic-gate * we should carry it out. When we encounter a rename-from
156*0Sstevel@tonic-gate * we can ignore it, since it should be dealt with as a side
157*0Sstevel@tonic-gate * effect of processing the rename-to.
158*0Sstevel@tonic-gate */
159*0Sstevel@tonic-gate if ((fp->f_srcdiffs|fp->f_dstdiffs) & D_RENAME_FROM)
160*0Sstevel@tonic-gate return (0);
161*0Sstevel@tonic-gate
162*0Sstevel@tonic-gate if ((fp->f_srcdiffs|fp->f_dstdiffs) & D_RENAME_TO) {
163*0Sstevel@tonic-gate
164*0Sstevel@tonic-gate if (opt_verbose)
165*0Sstevel@tonic-gate fprintf(stdout, gettext(V_renamed),
166*0Sstevel@tonic-gate fp->f_previous->f_fullname, fp->f_name);
167*0Sstevel@tonic-gate
168*0Sstevel@tonic-gate if (fp->f_srcdiffs & D_RENAME_TO) {
169*0Sstevel@tonic-gate errs = do_rename(fp, OPT_DST);
170*0Sstevel@tonic-gate fp->f_srcdiffs &= D_MTIME | D_SIZE;
171*0Sstevel@tonic-gate } else if (fp->f_dstdiffs & D_RENAME_TO) {
172*0Sstevel@tonic-gate errs = do_rename(fp, OPT_SRC);
173*0Sstevel@tonic-gate fp->f_dstdiffs &= D_MTIME | D_SIZE;
174*0Sstevel@tonic-gate }
175*0Sstevel@tonic-gate
176*0Sstevel@tonic-gate if (errs != ERR_RESOLVABLE)
177*0Sstevel@tonic-gate goto done;
178*0Sstevel@tonic-gate
179*0Sstevel@tonic-gate /*
180*0Sstevel@tonic-gate * if any differences remain, then we may be dealing
181*0Sstevel@tonic-gate * with contents changes in addition to a rename
182*0Sstevel@tonic-gate */
183*0Sstevel@tonic-gate if ((fp->f_srcdiffs | fp->f_dstdiffs) == 0)
184*0Sstevel@tonic-gate goto done;
185*0Sstevel@tonic-gate
186*0Sstevel@tonic-gate /*
187*0Sstevel@tonic-gate * fall through to reconcile the data changes
188*0Sstevel@tonic-gate */
189*0Sstevel@tonic-gate }
190*0Sstevel@tonic-gate
191*0Sstevel@tonic-gate /*
192*0Sstevel@tonic-gate * pull of the easy cases (non-conflict creations & deletions)
193*0Sstevel@tonic-gate */
194*0Sstevel@tonic-gate switch (fp->f_flags & (F_WHEREFOUND)) {
195*0Sstevel@tonic-gate case F_IN_BASELINE: /* only exists in baseline */
196*0Sstevel@tonic-gate case 0: /* only exists in rules */
197*0Sstevel@tonic-gate if (opt_verbose)
198*0Sstevel@tonic-gate fprintf(stdout, gettext(V_nomore),
199*0Sstevel@tonic-gate fp->f_fullname);
200*0Sstevel@tonic-gate fp->f_flags |= F_REMOVE; /* fix baseline */
201*0Sstevel@tonic-gate return (0);
202*0Sstevel@tonic-gate
203*0Sstevel@tonic-gate case F_IN_BASELINE|F_IN_SOURCE: /* deleted from dest */
204*0Sstevel@tonic-gate /*
205*0Sstevel@tonic-gate * the basic principle here is that we are willing
206*0Sstevel@tonic-gate * to do the deletion if:
207*0Sstevel@tonic-gate * no changes were made on the other side
208*0Sstevel@tonic-gate * OR
209*0Sstevel@tonic-gate * we have been told to force in this direction
210*0Sstevel@tonic-gate *
211*0Sstevel@tonic-gate * we do, however, make an exception for files that
212*0Sstevel@tonic-gate * will still have other links. In this case, the
213*0Sstevel@tonic-gate * (changed) data will still be accessable through
214*0Sstevel@tonic-gate * another link and so we are willing to do the unlink
215*0Sstevel@tonic-gate * inspite of conflicting changes (which may well
216*0Sstevel@tonic-gate * have been introduced through another link.
217*0Sstevel@tonic-gate *
218*0Sstevel@tonic-gate * The jury is still out on this one
219*0Sstevel@tonic-gate */
220*0Sstevel@tonic-gate if (((fp->f_srcdiffs&D_IMPORTANT) == 0) ||
221*0Sstevel@tonic-gate (opt_force == OPT_DST) ||
222*0Sstevel@tonic-gate has_other_links(fp, OPT_SRC)) {
223*0Sstevel@tonic-gate if (opt_verbose)
224*0Sstevel@tonic-gate fprintf(stdout, gettext(V_deleted),
225*0Sstevel@tonic-gate fp->f_fullname, "dst");
226*0Sstevel@tonic-gate errs = do_remove(fp, OPT_SRC);
227*0Sstevel@tonic-gate goto done;
228*0Sstevel@tonic-gate }
229*0Sstevel@tonic-gate
230*0Sstevel@tonic-gate /* a deletion combined with changes */
231*0Sstevel@tonic-gate if (opt_verbose)
232*0Sstevel@tonic-gate fprintf(stdout, gettext(V_delconf),
233*0Sstevel@tonic-gate fp->f_fullname);
234*0Sstevel@tonic-gate
235*0Sstevel@tonic-gate /* if we are to resolve in favor of source */
236*0Sstevel@tonic-gate if (opt_force == OPT_SRC) {
237*0Sstevel@tonic-gate errs = do_copy(fp, OPT_DST);
238*0Sstevel@tonic-gate goto done;
239*0Sstevel@tonic-gate }
240*0Sstevel@tonic-gate
241*0Sstevel@tonic-gate fp->f_problem = gettext(PROB_del_change);
242*0Sstevel@tonic-gate goto cant;
243*0Sstevel@tonic-gate
244*0Sstevel@tonic-gate case F_IN_BASELINE|F_IN_DEST: /* deleted from src */
245*0Sstevel@tonic-gate /* just like previous case, w/sides reversed */
246*0Sstevel@tonic-gate if (((fp->f_dstdiffs&D_IMPORTANT) == 0) ||
247*0Sstevel@tonic-gate (opt_force == OPT_SRC) ||
248*0Sstevel@tonic-gate has_other_links(fp, OPT_DST)) {
249*0Sstevel@tonic-gate if (opt_verbose)
250*0Sstevel@tonic-gate fprintf(stdout, gettext(V_deleted),
251*0Sstevel@tonic-gate fp->f_fullname, "src");
252*0Sstevel@tonic-gate errs = do_remove(fp, OPT_DST);
253*0Sstevel@tonic-gate goto done;
254*0Sstevel@tonic-gate }
255*0Sstevel@tonic-gate
256*0Sstevel@tonic-gate /* a deletion combined with changes */
257*0Sstevel@tonic-gate if (opt_verbose)
258*0Sstevel@tonic-gate fprintf(stdout, gettext(V_delconf),
259*0Sstevel@tonic-gate fp->f_fullname);
260*0Sstevel@tonic-gate
261*0Sstevel@tonic-gate /* if we are to resolve in favor of destination */
262*0Sstevel@tonic-gate if (opt_force == OPT_DST) {
263*0Sstevel@tonic-gate errs = do_copy(fp, OPT_SRC);
264*0Sstevel@tonic-gate goto done;
265*0Sstevel@tonic-gate }
266*0Sstevel@tonic-gate
267*0Sstevel@tonic-gate fp->f_problem = gettext(PROB_del_change);
268*0Sstevel@tonic-gate goto cant;
269*0Sstevel@tonic-gate
270*0Sstevel@tonic-gate /*
271*0Sstevel@tonic-gate * if something new shows up, and for some reason we cannot
272*0Sstevel@tonic-gate * propagate it to the other side, we should suppress the
273*0Sstevel@tonic-gate * file from the baseline, so it will show up as a new
274*0Sstevel@tonic-gate * creation next time too.
275*0Sstevel@tonic-gate */
276*0Sstevel@tonic-gate case F_IN_SOURCE: /* created in src */
277*0Sstevel@tonic-gate if (opt_verbose)
278*0Sstevel@tonic-gate fprintf(stdout, gettext(V_created),
279*0Sstevel@tonic-gate fp->f_fullname, "src");
280*0Sstevel@tonic-gate errs = do_copy(fp, OPT_DST);
281*0Sstevel@tonic-gate goto done;
282*0Sstevel@tonic-gate
283*0Sstevel@tonic-gate case F_IN_DEST: /* created in dest */
284*0Sstevel@tonic-gate if (opt_verbose)
285*0Sstevel@tonic-gate fprintf(stdout, gettext(V_created),
286*0Sstevel@tonic-gate fp->f_fullname, "dst");
287*0Sstevel@tonic-gate errs = do_copy(fp, OPT_SRC);
288*0Sstevel@tonic-gate goto done;
289*0Sstevel@tonic-gate
290*0Sstevel@tonic-gate case F_IN_SOURCE|F_IN_DEST: /* not in baseline */
291*0Sstevel@tonic-gate /*
292*0Sstevel@tonic-gate * since we don't have a baseline, we cannot
293*0Sstevel@tonic-gate * know which of the two copies should prevail
294*0Sstevel@tonic-gate */
295*0Sstevel@tonic-gate break;
296*0Sstevel@tonic-gate
297*0Sstevel@tonic-gate case F_IN_BASELINE|F_IN_SOURCE|F_IN_DEST:
298*0Sstevel@tonic-gate /*
299*0Sstevel@tonic-gate * we have a baseline where the two copies agreed,
300*0Sstevel@tonic-gate * so maybe we can determine that only one of the
301*0Sstevel@tonic-gate * two copies have changed ... but before we decide
302*0Sstevel@tonic-gate * who should be the winner we should determine
303*0Sstevel@tonic-gate * that the two copies are actually different.
304*0Sstevel@tonic-gate */
305*0Sstevel@tonic-gate break;
306*0Sstevel@tonic-gate }
307*0Sstevel@tonic-gate
308*0Sstevel@tonic-gate /*
309*0Sstevel@tonic-gate * if we have fallen out of the case statement, it is because
310*0Sstevel@tonic-gate * we have discovered a non-obvious situation where potentially
311*0Sstevel@tonic-gate * changed versions of the file exist on both sides.
312*0Sstevel@tonic-gate *
313*0Sstevel@tonic-gate * if the two copies turn out to be identical, this is simple
314*0Sstevel@tonic-gate */
315*0Sstevel@tonic-gate if (samedata(fp)) {
316*0Sstevel@tonic-gate if (samestuff(fp)) {
317*0Sstevel@tonic-gate /* files are identical, just update baseline */
318*0Sstevel@tonic-gate if (opt_verbose)
319*0Sstevel@tonic-gate fprintf(stdout, gettext(V_unchanged),
320*0Sstevel@tonic-gate fp->f_fullname);
321*0Sstevel@tonic-gate update_info(fp, OPT_SRC);
322*0Sstevel@tonic-gate goto done;
323*0Sstevel@tonic-gate } else {
324*0Sstevel@tonic-gate /*
325*0Sstevel@tonic-gate * contents agree but ownership/protection does
326*0Sstevel@tonic-gate * not agree, so we have to bring these into
327*0Sstevel@tonic-gate * agreement. We can pick a winner if one
328*0Sstevel@tonic-gate * side hasn't changed, or if the user has
329*0Sstevel@tonic-gate * specified a force flag.
330*0Sstevel@tonic-gate */
331*0Sstevel@tonic-gate if (opt_verbose)
332*0Sstevel@tonic-gate fprintf(stdout, gettext(V_modes),
333*0Sstevel@tonic-gate fp->f_fullname);
334*0Sstevel@tonic-gate
335*0Sstevel@tonic-gate if (((fp->f_srcdiffs & D_ADMIN) == 0) ||
336*0Sstevel@tonic-gate (opt_force == OPT_DST)) {
337*0Sstevel@tonic-gate errs = do_like(fp, OPT_SRC, TRUE);
338*0Sstevel@tonic-gate goto done;
339*0Sstevel@tonic-gate }
340*0Sstevel@tonic-gate
341*0Sstevel@tonic-gate if (((fp->f_dstdiffs & D_ADMIN) == 0) ||
342*0Sstevel@tonic-gate (opt_force == OPT_SRC)) {
343*0Sstevel@tonic-gate errs = do_like(fp, OPT_DST, TRUE);
344*0Sstevel@tonic-gate goto done;
345*0Sstevel@tonic-gate }
346*0Sstevel@tonic-gate }
347*0Sstevel@tonic-gate /* falls down to cant */
348*0Sstevel@tonic-gate } else {
349*0Sstevel@tonic-gate /*
350*0Sstevel@tonic-gate * The two files have different contents, so we have
351*0Sstevel@tonic-gate * a potential conflict here. If we know that only one
352*0Sstevel@tonic-gate * side has changed, we go with that side.
353*0Sstevel@tonic-gate */
354*0Sstevel@tonic-gate if (fp->f_dstdiffs == 0 || fp->f_srcdiffs == 0) {
355*0Sstevel@tonic-gate if (opt_verbose)
356*0Sstevel@tonic-gate fprintf(stdout, gettext(V_changed),
357*0Sstevel@tonic-gate fp->f_fullname);
358*0Sstevel@tonic-gate errs = do_copy(fp, fp->f_srcdiffs ? OPT_DST : OPT_SRC);
359*0Sstevel@tonic-gate goto done;
360*0Sstevel@tonic-gate }
361*0Sstevel@tonic-gate
362*0Sstevel@tonic-gate /*
363*0Sstevel@tonic-gate * Both sides have changed, so we have a real conflict.
364*0Sstevel@tonic-gate */
365*0Sstevel@tonic-gate if (opt_verbose)
366*0Sstevel@tonic-gate fprintf(stdout,
367*0Sstevel@tonic-gate gettext(truncated(fp) ?
368*0Sstevel@tonic-gate V_trunconf : V_different),
369*0Sstevel@tonic-gate fp->f_fullname);
370*0Sstevel@tonic-gate
371*0Sstevel@tonic-gate /*
372*0Sstevel@tonic-gate * See if the user has given us explicit instructions
373*0Sstevel@tonic-gate * on how to resolve conflicts. We may have been told
374*0Sstevel@tonic-gate * to favor the older, the newer, the source, or the
375*0Sstevel@tonic-gate * destination ... but the default is to leave the
376*0Sstevel@tonic-gate * conflict unresolved.
377*0Sstevel@tonic-gate */
378*0Sstevel@tonic-gate if (opt_force == OPT_OLD) {
379*0Sstevel@tonic-gate errs = do_copy(fp, newer(fp));
380*0Sstevel@tonic-gate goto done;
381*0Sstevel@tonic-gate }
382*0Sstevel@tonic-gate
383*0Sstevel@tonic-gate if (opt_force == OPT_NEW) {
384*0Sstevel@tonic-gate errs = do_copy(fp, older(fp));
385*0Sstevel@tonic-gate goto done;
386*0Sstevel@tonic-gate }
387*0Sstevel@tonic-gate
388*0Sstevel@tonic-gate if (opt_force != 0) {
389*0Sstevel@tonic-gate errs = do_copy(fp, (opt_force == OPT_SRC) ?
390*0Sstevel@tonic-gate OPT_DST : OPT_SRC);
391*0Sstevel@tonic-gate goto done;
392*0Sstevel@tonic-gate }
393*0Sstevel@tonic-gate
394*0Sstevel@tonic-gate
395*0Sstevel@tonic-gate /*
396*0Sstevel@tonic-gate * This is our last chance before giving up.
397*0Sstevel@tonic-gate *
398*0Sstevel@tonic-gate * We know that the files have different contents and
399*0Sstevel@tonic-gate * that there were changes on both sides. The only way
400*0Sstevel@tonic-gate * we can safely handle this is if there were pure contents
401*0Sstevel@tonic-gate * changes on one side and pure ownership changes on the
402*0Sstevel@tonic-gate * other side. In this case we can propagate the ownership
403*0Sstevel@tonic-gate * one way and the contents the other way.
404*0Sstevel@tonic-gate *
405*0Sstevel@tonic-gate * We decide whether or not this is possible by ANDing
406*0Sstevel@tonic-gate * together the changes on the two sides, and seeing
407*0Sstevel@tonic-gate * if the changes were all orthogonal (none of the same
408*0Sstevel@tonic-gate * things changed on both sides).
409*0Sstevel@tonic-gate */
410*0Sstevel@tonic-gate diffmask = fp->f_srcdiffs & fp->f_dstdiffs;
411*0Sstevel@tonic-gate if ((diffmask & D_CONTENTS) == 0) {
412*0Sstevel@tonic-gate /*
413*0Sstevel@tonic-gate * if ownership changes were only made on one side
414*0Sstevel@tonic-gate * (presumably the side that didn't have data changes)
415*0Sstevel@tonic-gate * we can handle them separately. In this case,
416*0Sstevel@tonic-gate * ownership changes must be fixed first, because
417*0Sstevel@tonic-gate * the subsequent do_copy will overwrite them.
418*0Sstevel@tonic-gate */
419*0Sstevel@tonic-gate if ((diffmask & D_ADMIN) == 0)
420*0Sstevel@tonic-gate errs |= do_like(fp, (fp->f_srcdiffs&D_ADMIN) ?
421*0Sstevel@tonic-gate OPT_DST : OPT_SRC,
422*0Sstevel@tonic-gate TRUE);
423*0Sstevel@tonic-gate
424*0Sstevel@tonic-gate /*
425*0Sstevel@tonic-gate * Now we can deal with the propagation of the data
426*0Sstevel@tonic-gate * changes. Note that any ownership/protection
427*0Sstevel@tonic-gate * changes (from the other side) that have not been
428*0Sstevel@tonic-gate * propagated yet are about to be lost. The cases
429*0Sstevel@tonic-gate * in which this might happen are all pathological
430*0Sstevel@tonic-gate * and the consequences of losing the protection
431*0Sstevel@tonic-gate * changes are (IMHO) minor when compared to the
432*0Sstevel@tonic-gate * obviously correct data propagation.
433*0Sstevel@tonic-gate */
434*0Sstevel@tonic-gate errs |= do_copy(fp, (fp->f_srcdiffs&D_CONTENTS) ?
435*0Sstevel@tonic-gate OPT_DST : OPT_SRC);
436*0Sstevel@tonic-gate goto done;
437*0Sstevel@tonic-gate }
438*0Sstevel@tonic-gate
439*0Sstevel@tonic-gate /*
440*0Sstevel@tonic-gate * there are conflicting changes, nobody has told us how to
441*0Sstevel@tonic-gate * resolve conflicts, and we cannot figure out how to merge
442*0Sstevel@tonic-gate * the differences.
443*0Sstevel@tonic-gate */
444*0Sstevel@tonic-gate fp->f_problem = gettext(PROB_different);
445*0Sstevel@tonic-gate }
446*0Sstevel@tonic-gate
447*0Sstevel@tonic-gate cant:
448*0Sstevel@tonic-gate /*
449*0Sstevel@tonic-gate * I'm not smart enough to resolve this conflict automatically,
450*0Sstevel@tonic-gate * so I have no choice but to bounce it back to the user.
451*0Sstevel@tonic-gate */
452*0Sstevel@tonic-gate fp->f_flags |= F_CONFLICT;
453*0Sstevel@tonic-gate fp->f_base->b_unresolved++;
454*0Sstevel@tonic-gate errs |= ERR_UNRESOLVED;
455*0Sstevel@tonic-gate
456*0Sstevel@tonic-gate done:
457*0Sstevel@tonic-gate /*
458*0Sstevel@tonic-gate * if we have a conflict and the file is not in the baseline,
459*0Sstevel@tonic-gate * then there was never any point at which the two copies were
460*0Sstevel@tonic-gate * in agreement, and we want to preserve the conflict for future
461*0Sstevel@tonic-gate * resolution.
462*0Sstevel@tonic-gate */
463*0Sstevel@tonic-gate if ((errs&ERR_UNRESOLVED) && (fp->f_flags & F_IN_BASELINE) == 0)
464*0Sstevel@tonic-gate if (fp->f_files == 0)
465*0Sstevel@tonic-gate /*
466*0Sstevel@tonic-gate * in most cases, this is most easily done by just
467*0Sstevel@tonic-gate * excluding the file in question from the baseline
468*0Sstevel@tonic-gate */
469*0Sstevel@tonic-gate fp->f_flags |= F_REMOVE;
470*0Sstevel@tonic-gate else
471*0Sstevel@tonic-gate /*
472*0Sstevel@tonic-gate * but ... if the file in question is a directory
473*0Sstevel@tonic-gate * with children, excluding it from the baseline
474*0Sstevel@tonic-gate * would keep all of its children (even those with
475*0Sstevel@tonic-gate * no conflicts) out of the baseline as well. In
476*0Sstevel@tonic-gate * This case, it is better to tell a lie and to
477*0Sstevel@tonic-gate * manufacture a point of imaginary agreement
478*0Sstevel@tonic-gate * in the baseline ... but one that is absurd enough
479*0Sstevel@tonic-gate * that we will still see conflicts each time we run.
480*0Sstevel@tonic-gate *
481*0Sstevel@tonic-gate * recording a type of directory, and everything
482*0Sstevel@tonic-gate * else as zero should be absurd enough.
483*0Sstevel@tonic-gate */
484*0Sstevel@tonic-gate fp->f_info[ OPT_BASE ].f_type = S_IFDIR;
485*0Sstevel@tonic-gate
486*0Sstevel@tonic-gate if (opt_debug & DBG_MISC)
487*0Sstevel@tonic-gate fprintf(stderr, "MISC: %s ERRS=%s\n", fp->f_fullname,
488*0Sstevel@tonic-gate showflags(errmap, errs));
489*0Sstevel@tonic-gate
490*0Sstevel@tonic-gate return (errs);
491*0Sstevel@tonic-gate }
492*0Sstevel@tonic-gate
493*0Sstevel@tonic-gate /*
494*0Sstevel@tonic-gate * routine:
495*0Sstevel@tonic-gate * newer
496*0Sstevel@tonic-gate *
497*0Sstevel@tonic-gate * purpose:
498*0Sstevel@tonic-gate * determine which of two files is newer
499*0Sstevel@tonic-gate *
500*0Sstevel@tonic-gate * parameters:
501*0Sstevel@tonic-gate * struct file
502*0Sstevel@tonic-gate *
503*0Sstevel@tonic-gate * returns:
504*0Sstevel@tonic-gate * side_t (src/dest)
505*0Sstevel@tonic-gate */
506*0Sstevel@tonic-gate static side_t
newer(struct file * fp)507*0Sstevel@tonic-gate newer(struct file *fp)
508*0Sstevel@tonic-gate {
509*0Sstevel@tonic-gate struct fileinfo *sp, *dp;
510*0Sstevel@tonic-gate
511*0Sstevel@tonic-gate sp = &fp->f_info[OPT_SRC];
512*0Sstevel@tonic-gate dp = &fp->f_info[OPT_DST];
513*0Sstevel@tonic-gate
514*0Sstevel@tonic-gate if (sp->f_modtime > dp->f_modtime)
515*0Sstevel@tonic-gate return (OPT_SRC);
516*0Sstevel@tonic-gate
517*0Sstevel@tonic-gate if (sp->f_modtime < dp->f_modtime)
518*0Sstevel@tonic-gate return (OPT_DST);
519*0Sstevel@tonic-gate
520*0Sstevel@tonic-gate if (sp->f_modns >= dp->f_modns)
521*0Sstevel@tonic-gate return (OPT_SRC);
522*0Sstevel@tonic-gate
523*0Sstevel@tonic-gate return (OPT_DST);
524*0Sstevel@tonic-gate }
525*0Sstevel@tonic-gate
526*0Sstevel@tonic-gate /*
527*0Sstevel@tonic-gate * routine:
528*0Sstevel@tonic-gate * older
529*0Sstevel@tonic-gate *
530*0Sstevel@tonic-gate * purpose:
531*0Sstevel@tonic-gate * determine which of two files is older
532*0Sstevel@tonic-gate *
533*0Sstevel@tonic-gate * parameters:
534*0Sstevel@tonic-gate * struct file
535*0Sstevel@tonic-gate *
536*0Sstevel@tonic-gate * returns:
537*0Sstevel@tonic-gate * side_t (src/dest)
538*0Sstevel@tonic-gate */
539*0Sstevel@tonic-gate static side_t
older(struct file * fp)540*0Sstevel@tonic-gate older(struct file *fp)
541*0Sstevel@tonic-gate {
542*0Sstevel@tonic-gate struct fileinfo *sp, *dp;
543*0Sstevel@tonic-gate
544*0Sstevel@tonic-gate sp = &fp->f_info[OPT_SRC];
545*0Sstevel@tonic-gate dp = &fp->f_info[OPT_DST];
546*0Sstevel@tonic-gate
547*0Sstevel@tonic-gate if (sp->f_modtime < dp->f_modtime)
548*0Sstevel@tonic-gate return (OPT_SRC);
549*0Sstevel@tonic-gate
550*0Sstevel@tonic-gate if (sp->f_modtime > dp->f_modtime)
551*0Sstevel@tonic-gate return (OPT_DST);
552*0Sstevel@tonic-gate
553*0Sstevel@tonic-gate if (sp->f_modns <= dp->f_modns)
554*0Sstevel@tonic-gate return (OPT_SRC);
555*0Sstevel@tonic-gate
556*0Sstevel@tonic-gate return (OPT_DST);
557*0Sstevel@tonic-gate }
558*0Sstevel@tonic-gate
559*0Sstevel@tonic-gate /*
560*0Sstevel@tonic-gate * routine:
561*0Sstevel@tonic-gate * samedata
562*0Sstevel@tonic-gate *
563*0Sstevel@tonic-gate * purpose:
564*0Sstevel@tonic-gate * determine whether or not two files contain the same data
565*0Sstevel@tonic-gate *
566*0Sstevel@tonic-gate * parameters:
567*0Sstevel@tonic-gate * struct file
568*0Sstevel@tonic-gate *
569*0Sstevel@tonic-gate * returns:
570*0Sstevel@tonic-gate * bool_t (true/false)
571*0Sstevel@tonic-gate */
572*0Sstevel@tonic-gate static bool_t
samedata(struct file * fp)573*0Sstevel@tonic-gate samedata(struct file *fp)
574*0Sstevel@tonic-gate {
575*0Sstevel@tonic-gate struct fileinfo *sp, *dp;
576*0Sstevel@tonic-gate
577*0Sstevel@tonic-gate sp = &fp->f_info[OPT_SRC];
578*0Sstevel@tonic-gate dp = &fp->f_info[OPT_DST];
579*0Sstevel@tonic-gate
580*0Sstevel@tonic-gate /* cheap test: types are different */
581*0Sstevel@tonic-gate if (sp->f_type != dp->f_type)
582*0Sstevel@tonic-gate return (FALSE);
583*0Sstevel@tonic-gate
584*0Sstevel@tonic-gate /* cheap test: directories have same contents */
585*0Sstevel@tonic-gate if (sp->f_type == S_IFDIR)
586*0Sstevel@tonic-gate return (TRUE);
587*0Sstevel@tonic-gate
588*0Sstevel@tonic-gate /* special files are compared via their maj/min */
589*0Sstevel@tonic-gate if ((sp->f_type == S_IFBLK) || (sp->f_type == S_IFCHR)) {
590*0Sstevel@tonic-gate if (sp->f_rd_maj != dp->f_rd_maj)
591*0Sstevel@tonic-gate return (FALSE);
592*0Sstevel@tonic-gate if (sp->f_rd_min != dp->f_rd_min)
593*0Sstevel@tonic-gate return (FALSE);
594*0Sstevel@tonic-gate return (TRUE);
595*0Sstevel@tonic-gate }
596*0Sstevel@tonic-gate
597*0Sstevel@tonic-gate /* symlinks are the same if their contents are the same */
598*0Sstevel@tonic-gate if (sp->f_type == S_IFLNK)
599*0Sstevel@tonic-gate return (samelink());
600*0Sstevel@tonic-gate
601*0Sstevel@tonic-gate /* cheap test: sizes are different */
602*0Sstevel@tonic-gate if (fp->f_info[OPT_SRC].f_size != fp->f_info[OPT_DST].f_size)
603*0Sstevel@tonic-gate return (FALSE);
604*0Sstevel@tonic-gate
605*0Sstevel@tonic-gate /* expensive test: byte for byte comparison */
606*0Sstevel@tonic-gate if (samecompare(fp) == 0)
607*0Sstevel@tonic-gate return (FALSE);
608*0Sstevel@tonic-gate
609*0Sstevel@tonic-gate return (TRUE);
610*0Sstevel@tonic-gate }
611*0Sstevel@tonic-gate
612*0Sstevel@tonic-gate /*
613*0Sstevel@tonic-gate * routine:
614*0Sstevel@tonic-gate * samestuff
615*0Sstevel@tonic-gate *
616*0Sstevel@tonic-gate * purpose:
617*0Sstevel@tonic-gate * determine whether or not two files have same owner/protection
618*0Sstevel@tonic-gate *
619*0Sstevel@tonic-gate * parameters:
620*0Sstevel@tonic-gate * struct file
621*0Sstevel@tonic-gate *
622*0Sstevel@tonic-gate * returns:
623*0Sstevel@tonic-gate * bool_t (true/false)
624*0Sstevel@tonic-gate */
625*0Sstevel@tonic-gate static bool_t
samestuff(struct file * fp)626*0Sstevel@tonic-gate samestuff(struct file *fp)
627*0Sstevel@tonic-gate { int same_mode, same_uid, same_gid, same_acl;
628*0Sstevel@tonic-gate struct fileinfo *sp, *dp;
629*0Sstevel@tonic-gate
630*0Sstevel@tonic-gate sp = &fp->f_info[OPT_SRC];
631*0Sstevel@tonic-gate dp = &fp->f_info[OPT_DST];
632*0Sstevel@tonic-gate
633*0Sstevel@tonic-gate same_mode = (sp->f_mode == dp->f_mode);
634*0Sstevel@tonic-gate same_uid = (sp->f_uid == dp->f_uid);
635*0Sstevel@tonic-gate same_gid = (sp->f_gid == dp->f_gid);
636*0Sstevel@tonic-gate same_acl = cmp_acls(sp, dp);
637*0Sstevel@tonic-gate
638*0Sstevel@tonic-gate /* if the are all the same, it is easy to tell the truth */
639*0Sstevel@tonic-gate if (same_uid && same_gid && same_mode && same_acl)
640*0Sstevel@tonic-gate return (TRUE);
641*0Sstevel@tonic-gate
642*0Sstevel@tonic-gate /* note the nature of the conflict */
643*0Sstevel@tonic-gate if (!same_uid || !same_gid || !same_acl)
644*0Sstevel@tonic-gate fp->f_problem = gettext(PROB_ownership);
645*0Sstevel@tonic-gate else
646*0Sstevel@tonic-gate fp->f_problem = gettext(PROB_protection);
647*0Sstevel@tonic-gate
648*0Sstevel@tonic-gate return (FALSE);
649*0Sstevel@tonic-gate }
650*0Sstevel@tonic-gate
651*0Sstevel@tonic-gate /*
652*0Sstevel@tonic-gate * routine:
653*0Sstevel@tonic-gate * samecompare
654*0Sstevel@tonic-gate *
655*0Sstevel@tonic-gate * purpose:
656*0Sstevel@tonic-gate * do a byte-for-byte comparison of two files
657*0Sstevel@tonic-gate *
658*0Sstevel@tonic-gate * parameters:
659*0Sstevel@tonic-gate * struct file
660*0Sstevel@tonic-gate *
661*0Sstevel@tonic-gate * returns:
662*0Sstevel@tonic-gate * bool_t (true/false)
663*0Sstevel@tonic-gate */
664*0Sstevel@tonic-gate static bool_t
samecompare(struct file * fp)665*0Sstevel@tonic-gate samecompare(struct file *fp)
666*0Sstevel@tonic-gate { int sfd, dfd;
667*0Sstevel@tonic-gate int i, count;
668*0Sstevel@tonic-gate char srcbuf[ COPY_BSIZE ], dstbuf[ COPY_BSIZE ];
669*0Sstevel@tonic-gate bool_t same = TRUE;
670*0Sstevel@tonic-gate
671*0Sstevel@tonic-gate
672*0Sstevel@tonic-gate sfd = open(srcname, 0);
673*0Sstevel@tonic-gate if (sfd < 0)
674*0Sstevel@tonic-gate return (FALSE);
675*0Sstevel@tonic-gate
676*0Sstevel@tonic-gate dfd = open(dstname, 0);
677*0Sstevel@tonic-gate if (dfd < 0) {
678*0Sstevel@tonic-gate close(sfd);
679*0Sstevel@tonic-gate return (FALSE);
680*0Sstevel@tonic-gate }
681*0Sstevel@tonic-gate
682*0Sstevel@tonic-gate for (
683*0Sstevel@tonic-gate count = read(sfd, srcbuf, COPY_BSIZE);
684*0Sstevel@tonic-gate count > 0;
685*0Sstevel@tonic-gate count = read(sfd, srcbuf, COPY_BSIZE)) {
686*0Sstevel@tonic-gate
687*0Sstevel@tonic-gate /* do a matching read */
688*0Sstevel@tonic-gate if (read(dfd, dstbuf, COPY_BSIZE) != count) {
689*0Sstevel@tonic-gate same = FALSE;
690*0Sstevel@tonic-gate goto done;
691*0Sstevel@tonic-gate }
692*0Sstevel@tonic-gate
693*0Sstevel@tonic-gate /* do the comparison for this block */
694*0Sstevel@tonic-gate for (i = 0; i < count; i++) {
695*0Sstevel@tonic-gate if (srcbuf[i] != dstbuf[i]) {
696*0Sstevel@tonic-gate same = FALSE;
697*0Sstevel@tonic-gate goto done;
698*0Sstevel@tonic-gate }
699*0Sstevel@tonic-gate }
700*0Sstevel@tonic-gate }
701*0Sstevel@tonic-gate
702*0Sstevel@tonic-gate done:
703*0Sstevel@tonic-gate if (opt_debug & DBG_ANAL)
704*0Sstevel@tonic-gate fprintf(stderr, "ANAL: SAME=%d %s\n", same, fp->f_fullname);
705*0Sstevel@tonic-gate
706*0Sstevel@tonic-gate close(sfd);
707*0Sstevel@tonic-gate close(dfd);
708*0Sstevel@tonic-gate return (same);
709*0Sstevel@tonic-gate }
710*0Sstevel@tonic-gate
711*0Sstevel@tonic-gate /*
712*0Sstevel@tonic-gate * routine:
713*0Sstevel@tonic-gate * truncated
714*0Sstevel@tonic-gate *
715*0Sstevel@tonic-gate * purpose:
716*0Sstevel@tonic-gate * to determine whether or not a file has been truncated
717*0Sstevel@tonic-gate *
718*0Sstevel@tonic-gate * parameters:
719*0Sstevel@tonic-gate * pointer to file structure
720*0Sstevel@tonic-gate *
721*0Sstevel@tonic-gate * returns:
722*0Sstevel@tonic-gate * true/false
723*0Sstevel@tonic-gate */
724*0Sstevel@tonic-gate static bool_t
truncated(struct file * fp)725*0Sstevel@tonic-gate truncated(struct file *fp)
726*0Sstevel@tonic-gate {
727*0Sstevel@tonic-gate /* either source or destination must now be zero length */
728*0Sstevel@tonic-gate if (fp->f_info[OPT_SRC].f_size && fp->f_info[OPT_DST].f_size)
729*0Sstevel@tonic-gate return (FALSE);
730*0Sstevel@tonic-gate
731*0Sstevel@tonic-gate /* file must have originally had a non-zero length */
732*0Sstevel@tonic-gate if (fp->f_info[OPT_BASE].f_size == 0)
733*0Sstevel@tonic-gate return (FALSE);
734*0Sstevel@tonic-gate
735*0Sstevel@tonic-gate /* file type must "normal" all around */
736*0Sstevel@tonic-gate if (fp->f_info[OPT_BASE].f_type != S_IFREG)
737*0Sstevel@tonic-gate return (FALSE);
738*0Sstevel@tonic-gate if (fp->f_info[OPT_SRC].f_type != S_IFREG)
739*0Sstevel@tonic-gate return (FALSE);
740*0Sstevel@tonic-gate if (fp->f_info[OPT_DST].f_type != S_IFREG)
741*0Sstevel@tonic-gate return (FALSE);
742*0Sstevel@tonic-gate
743*0Sstevel@tonic-gate
744*0Sstevel@tonic-gate return (TRUE);
745*0Sstevel@tonic-gate }
746*0Sstevel@tonic-gate
747*0Sstevel@tonic-gate /*
748*0Sstevel@tonic-gate * routine:
749*0Sstevel@tonic-gate * samelink
750*0Sstevel@tonic-gate *
751*0Sstevel@tonic-gate * purpose:
752*0Sstevel@tonic-gate * to determine whether or not two symbolic links agree
753*0Sstevel@tonic-gate *
754*0Sstevel@tonic-gate * parameters:
755*0Sstevel@tonic-gate * pointer to file structure
756*0Sstevel@tonic-gate *
757*0Sstevel@tonic-gate * returns:
758*0Sstevel@tonic-gate * true/false
759*0Sstevel@tonic-gate */
760*0Sstevel@tonic-gate static bool_t
samelink()761*0Sstevel@tonic-gate samelink()
762*0Sstevel@tonic-gate { int i, srclen, dstlen;
763*0Sstevel@tonic-gate char srcbuf[ MAX_PATH ], dstbuf[ MAX_PATH ];
764*0Sstevel@tonic-gate
765*0Sstevel@tonic-gate
766*0Sstevel@tonic-gate /* read both copies of the link */
767*0Sstevel@tonic-gate srclen = readlink(srcname, srcbuf, sizeof (srcbuf));
768*0Sstevel@tonic-gate dstlen = readlink(dstname, dstbuf, sizeof (dstbuf));
769*0Sstevel@tonic-gate
770*0Sstevel@tonic-gate /* if they aren't the same length, they disagree */
771*0Sstevel@tonic-gate if (srclen < 0 || dstlen < 0 || srclen != dstlen)
772*0Sstevel@tonic-gate return (FALSE);
773*0Sstevel@tonic-gate
774*0Sstevel@tonic-gate /* look for differences in contents */
775*0Sstevel@tonic-gate for (i = 0; i < srclen; i++)
776*0Sstevel@tonic-gate if (srcbuf[i] != dstbuf[i])
777*0Sstevel@tonic-gate return (FALSE);
778*0Sstevel@tonic-gate
779*0Sstevel@tonic-gate return (TRUE);
780*0Sstevel@tonic-gate }
781*0Sstevel@tonic-gate
782*0Sstevel@tonic-gate /*
783*0Sstevel@tonic-gate * routine:
784*0Sstevel@tonic-gate * full_name
785*0Sstevel@tonic-gate *
786*0Sstevel@tonic-gate * purpose:
787*0Sstevel@tonic-gate * to figure out the fully qualified path name to a file on the
788*0Sstevel@tonic-gate * reconciliation list.
789*0Sstevel@tonic-gate *
790*0Sstevel@tonic-gate * parameters:
791*0Sstevel@tonic-gate * pointer to the file structure
792*0Sstevel@tonic-gate * side indication for which base to use
793*0Sstevel@tonic-gate * side indication for which buffer to use
794*0Sstevel@tonic-gate *
795*0Sstevel@tonic-gate * returns:
796*0Sstevel@tonic-gate * pointer to a clobberable buffer
797*0Sstevel@tonic-gate *
798*0Sstevel@tonic-gate * notes:
799*0Sstevel@tonic-gate * the zero'th buffer is used for renames and links, where
800*0Sstevel@tonic-gate * we need the name of another file on the same side.
801*0Sstevel@tonic-gate */
802*0Sstevel@tonic-gate char *
full_name(struct file * fp,side_t srcdst,side_t whichbuf)803*0Sstevel@tonic-gate full_name(struct file *fp, side_t srcdst, side_t whichbuf)
804*0Sstevel@tonic-gate { static char *buffers[3];
805*0Sstevel@tonic-gate static int buflen = 0;
806*0Sstevel@tonic-gate char *p, *b;
807*0Sstevel@tonic-gate int l;
808*0Sstevel@tonic-gate
809*0Sstevel@tonic-gate /* see if the existing buffer is long enough */
810*0Sstevel@tonic-gate b = (srcdst == OPT_SRC) ? fp->f_base->b_src_name
811*0Sstevel@tonic-gate : fp->f_base->b_dst_name;
812*0Sstevel@tonic-gate
813*0Sstevel@tonic-gate /* see if the allocated buffer is long enough */
814*0Sstevel@tonic-gate l = strlen(b) + strlen(fp->f_fullname) + 2;
815*0Sstevel@tonic-gate if (l > buflen) {
816*0Sstevel@tonic-gate /* figure out the next "nice" size to use */
817*0Sstevel@tonic-gate for (buflen = MAX_PATH; buflen < l; buflen += MAX_NAME);
818*0Sstevel@tonic-gate
819*0Sstevel@tonic-gate /* reallocate all buffers to this size */
820*0Sstevel@tonic-gate for (l = 0; l < 3; l++) {
821*0Sstevel@tonic-gate buffers[l] = (char *) realloc(buffers[l], buflen);
822*0Sstevel@tonic-gate if (buffers[l] == 0)
823*0Sstevel@tonic-gate nomem("full name");
824*0Sstevel@tonic-gate }
825*0Sstevel@tonic-gate }
826*0Sstevel@tonic-gate
827*0Sstevel@tonic-gate /* assemble the name in the buffer and reurn it */
828*0Sstevel@tonic-gate p = buffers[whichbuf];
829*0Sstevel@tonic-gate strcpy(p, b);
830*0Sstevel@tonic-gate strcat(p, "/");
831*0Sstevel@tonic-gate strcat(p, fp->f_fullname);
832*0Sstevel@tonic-gate return (p);
833*0Sstevel@tonic-gate }
834