Annotation of freem/src/grestore.c, revision 1.4
1.1 snw 1: /*
1.4 ! snw 2: * $Id: grestore.c,v 1.3 2025/03/09 19:14:25 snw Exp $
1.1 snw 3: * repairs degraded freem globals
4: *
5: *
1.2 snw 6: * Author: Serena Willis <snw@coherent-logic.com>
1.1 snw 7: * Copyright (C) 1998 MUG Deutschland
1.3 snw 8: * Copyright (C) 2020, 2025 Coherent Logic Development LLC
1.1 snw 9: *
10: *
11: * This file is part of FreeM.
12: *
13: * FreeM is free software: you can redistribute it and/or modify
14: * it under the terms of the GNU Affero Public License as published by
15: * the Free Software Foundation, either version 3 of the License, or
16: * (at your option) any later version.
17: *
18: * FreeM is distributed in the hope that it will be useful,
19: * but WITHOUT ANY WARRANTY; without even the implied warranty of
20: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21: * GNU Affero Public License for more details.
22: *
23: * You should have received a copy of the GNU Affero Public License
24: * along with FreeM. If not, see <https://www.gnu.org/licenses/>.
25: *
1.4 ! snw 26: * $Log: grestore.c,v $
! 27: * Revision 1.3 2025/03/09 19:14:25 snw
! 28: * First phase of REUSE compliance and header reformat
! 29: *
1.3 snw 30: *
31: * SPDX-FileCopyrightText: (C) 2025 Coherent Logic Development LLC
32: * SPDX-License-Identifier: AGPL-3.0-or-later
1.1 snw 33: **/
34:
35: /* restores mumps globals.
36: * needs free disk storages approx. the size of the
37: * global to be restored. only data blocks are interpreted.
38: * it cannot recover from some errors in data blocks.
39: * anyway the global to be restored should be saved for
40: * a detailed analysis of the error.
41: */
42:
43: #include <stdlib.h>
44: #include <stddef.h>
45: #include "mpsdef0.h"
46: #include "errmsg.h"
47: #include <signal.h>
48: #include <setjmp.h>
49: #include <stdio.h>
50: #include <fcntl.h>
51: #include <unistd.h>
52: #include <sys/types.h>
53: #include <sys/stat.h>
54: #include <sys/wait.h>
55: #include <string.h>
56:
57:
58: /* needed if byte data are to be interpreted as unsigned integer */
59: #define UNSIGN(A) ((A)&0377)
60:
61: #define g_EOL 30
62: #define POINT 28
63: #define MINUS 26
64:
65: #define ROOT 0L
66: /* length of blocks. status bytes defined as offset to blocklength */
67: #define DATALIM (BLOCKLEN-11)
68: #define LLPTR (BLOCKLEN-10)
69: #define NRBLK LLPTR
70: #define RLPTR (BLOCKLEN- 6)
71: #define FREE RLPTR
72: #define BTYP (BLOCKLEN- 3)
73: #define OFFS (BLOCKLEN- 2)
74:
75: #define EMPTY 0
76: #define FBLK 1
77: #define POINTER 2
78: #define BOTTOM 6
79: #define DATA 8
80:
81: #define PROTECT 30
82:
83:
84: #ifndef SYSFIVE
85: #define FreeM_timezone -3600
86: #else
87:
88: #ifdef __CYGWIN__
89: #define FreeM_timezone _timezone
90: #else
91: extern long FreeM_timezone;
92: #endif /* __CYGWIN__ */
93:
94: #endif /* SYSFIVE */
95:
96: /* mumps commands */
97: #define BREAK 'b'
98: #define CLOSE 'c'
99: #define DO 'd'
100: #define DO_BLOCK 2
101: #define ELSE 'e'
102: #define FOR 'f'
103: #define GOTO 'g'
104: #define HA 'h'
105: #define HALT '0'
106: #define HANG '1'
107: #define IF 'i'
108: #define JOB 'j'
109: #define KILL 'k'
110: #define LOCK 'l'
111: #define NEW 'n'
112: #define OPEN 'o'
113: #define QUIT 'q'
114: #define READ 'r'
115: #define SET 's'
116: #define USE 'u'
117: #define VIEW 'v'
118: #define WRITE 'w'
119: #define XECUTE 'x'
120:
121: #define ZBREAK 'B'
122: #define ZGO 'G'
123: #define ZHALT 'H'
124: #define ZINSERT 'I'
125: #define ZJOB 'J'
126: #define ZLOAD 'L'
127: #define ZNEW 'N'
128: #define ZPRINT 'P'
129: #define ZQUIT 'Q'
130: #define ZREMOVE 'R'
131: #define ZSAVE 'S'
132: #define ZTRAP 'T'
133: #define ZWRITE 'W'
134: #define PRIVATE SP
135:
136: extern short ierr;
137:
138: int main (argc, argv)
139: int argc; /* arguments count */
140: char *argv[]; /* arguments string */
141:
142: {
143: char filnam[40]; /* global to be restored */
144: static
145: char savnam[512] = "^/usr/tmp/", /* intermediate storage */
146: unlnam[40] = "/usr/tmp/^"; /* "unlink" filename */
147: short fildes; /* file descriptor to filnam */
148: char block[BLOCKLEN];
149: char key[512];
150: char data[512];
151: unsigned long blknbr;
152: long offset;
153: short type;
154: long length;
155: long koffs;
156:
157: register int i,
158: j,
159: k,
160: ch;
161:
162: umask (0); /* protection bits mask to full rights */
163: filnam[0] = '^';
164: filnam[1] = 0;
165:
166: if (argc > 1) {
167: j = 0;
168: while (--argc > 0) {
169: j++;
170: if (**(argv + j) == '-') {
171: printf ("usage is: %s [^]global\012\015", *argv);
172: exit (0);
173: }
174: strcpy (&filnam[1], *(argv + j));
175: }
176: } else {
177: printf ("\012\015%s global ^", *argv);
178: scanf ("%s", &filnam[1]);
179: }
180:
181: j = filnam[1];
182: if (j == '.' || j == '/' || j == '^') {
183: j = 0;
184: while ((filnam[j] = filnam[j + 1]))
185: j++;
186: }
187: if ((fildes = open (filnam, 0)) == -1) {
188: printf ("cannot open file %s\007\012\015", filnam);
189: exit (1);
190: }
191: strcpy (&savnam[10], &filnam[1]);
192: koffs = 10 + strlen (&filnam[1]);
193: strcpy (&unlnam[10], &filnam[1]);
194: unlink (unlnam); /* kill previous tmp_file */
195: blknbr = ROOT;
196:
197: again:;
198:
199: lseek (fildes, blknbr * BLOCKLEN, 0);
200: blknbr++;
201: if (read (fildes, block, BLOCKLEN) == 0) {
202: strcpy (block, "mv /usr/tmp/\\^");
203: strcat (block, &filnam[1]);
204: strcat (block, " .");
205: system (block);
206: exit (0);
207: }
208: type = block[BTYP];
209: if (type != DATA)
210: goto again;
211:
212: offset = UNSIGN (block[OFFS]) * 256 +
213: UNSIGN (block[OFFS + 1]);
214: if (offset > DATALIM) {
215: printf ("illegal offset %ld\012", offset);
216: offset = DATALIM;
217: }
218: i = 0;
219: while (i < offset) {
220: length = UNSIGN (block[i++]);
221: k = UNSIGN (block[i++]);
222: if ((i + length) > offset)
223: break;
224: for (j = 0; j < length; j++)
225: key[k++] = block[i++];
226: key[k] = g_EOL;
227: /*----------------------*/
228: {
229: long ch0,
230: i,
231: j,
232: k;
233:
234: j = 0;
235: i = 0;
236: data[j++] = DELIM;
237: k = 1;
238: while ((ch = UNSIGN (key[i++])) != g_EOL) {
239: if (k) {
240: k = 0;
241: }
242: ch0 = (ch >= SP ? (ch >> 1) : /* 'string' chars */
243: (ch < 20 ? (ch >> 1) + '0' : /* 0...9 */
244: (ch >> 1) + SP)); /* '.' or '-' */
245: if (ch0 == DEL) {
246: if (((ch = UNSIGN (key[i++])) >> 1) == DEL) {
247: ch0 += DEL;
248: ch = UNSIGN (key[i++]);
249: }
250: ch0 += (ch >> 1);
251: }
252: data[j++] = ch0;
253: if (ch & 01) {
254: data[j++] = DELIM;
255: k = 1;
256: }
257: }
258: data[j--] = EOL;
259: if (j == 0)
260: data[0] = EOL;
261: else if (data[j] == DELIM)
262: data[j] = EOL;
263: if ((koffs + j) > 255)
264: goto again; /* oversize subscript */
265: while (j >= 0) {
266: if ((UNSIGN (ch = data[--j]) < SP) && (ch != DELIM))
267: break;
268: }
269:
270: if (j < 0)
271: stcpy (&savnam[koffs], data);
272: else
273: goto again; /* illegal subscipt */
274: /*----------------------*/
275: }
276: length = UNSIGN (block[i++]);
277: k = 0;
278: if ((i + length) > offset)
279: break;
280: stcpy0 (data, &block[i], length);
281: i += length;
282: data[length] = EOL;
283: global (0, savnam, data); /* call original global */
284:
285: if (merr () == PROTECT) {
286: printf ("\012cannot open intermediate file in /usr/tmp\012");
287: exit (1);
288: }
289: }
290: if (i != offset)
291: printf ("\012wrong offset %ld vs. %d\012", offset, i);
292: goto again;
293: }
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