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1.1 deraadt 1: #ifndef lint
2: static char rcsid[] = "$Id: util.c,v 1.3 1993/12/07 10:36:16 mycroft Exp $";
3: #endif /* not lint */
4:
5: #include "EXTERN.h"
6: #include "common.h"
7: #include "INTERN.h"
8: #include "util.h"
9: #include "backupfile.h"
10:
11: void my_exit();
12:
13: /* Rename a file, copying it if necessary. */
14:
15: int
16: move_file(from,to)
17: char *from, *to;
18: {
19: char bakname[512];
20: Reg1 char *s;
21: Reg2 int i;
22: Reg3 int fromfd;
23:
24: /* to stdout? */
25:
26: if (strEQ(to, "-")) {
27: #ifdef DEBUGGING
28: if (debug & 4)
29: say2("Moving %s to stdout.\n", from);
30: #endif
31: fromfd = open(from, 0);
32: if (fromfd < 0)
33: pfatal2("internal error, can't reopen %s", from);
34: while ((i=read(fromfd, buf, sizeof buf)) > 0)
35: if (write(1, buf, i) != 1)
36: pfatal1("write failed");
37: Close(fromfd);
38: return 0;
39: }
40:
41: if (origprae) {
42: Strcpy(bakname, origprae);
43: Strcat(bakname, to);
44: } else {
45: #ifndef NODIR
46: char *backupname = find_backup_file_name(to);
47: if (backupname == (char *) 0)
48: fatal1("out of memory\n");
49: Strcpy(bakname, backupname);
50: free(backupname);
51: #else /* NODIR */
52: Strcpy(bakname, to);
53: Strcat(bakname, simple_backup_suffix);
54: #endif /* NODIR */
55: }
56:
57: if (stat(to, &filestat) == 0) { /* output file exists */
58: dev_t to_device = filestat.st_dev;
59: ino_t to_inode = filestat.st_ino;
60: char *simplename = bakname;
61:
62: for (s=bakname; *s; s++) {
63: if (*s == '/')
64: simplename = s+1;
65: }
66: /* Find a backup name that is not the same file.
67: Change the first lowercase char into uppercase;
68: if that isn't sufficient, chop off the first char and try again. */
69: while (stat(bakname, &filestat) == 0 &&
70: to_device == filestat.st_dev && to_inode == filestat.st_ino) {
71: /* Skip initial non-lowercase chars. */
72: for (s=simplename; *s && !islower(*s); s++) ;
73: if (*s)
74: *s = toupper(*s);
75: else
76: Strcpy(simplename, simplename+1);
77: }
78: while (unlink(bakname) >= 0) ; /* while() is for benefit of Eunice */
79: #ifdef DEBUGGING
80: if (debug & 4)
81: say3("Moving %s to %s.\n", to, bakname);
82: #endif
83: if (link(to, bakname) < 0) {
84: /* Maybe `to' is a symlink into a different file system.
85: Copying replaces the symlink with a file; using rename
86: would be better. */
87: Reg4 int tofd;
88: Reg5 int bakfd;
89:
90: bakfd = creat(bakname, 0666);
91: if (bakfd < 0) {
92: say4("Can't backup %s, output is in %s: %s\n", to, from,
93: strerror(errno));
94: return -1;
95: }
96: tofd = open(to, 0);
97: if (tofd < 0)
98: pfatal2("internal error, can't open %s", to);
99: while ((i=read(tofd, buf, sizeof buf)) > 0)
100: if (write(bakfd, buf, i) != i)
101: pfatal1("write failed");
102: Close(tofd);
103: Close(bakfd);
104: }
105: while (unlink(to) >= 0) ;
106: }
107: #ifdef DEBUGGING
108: if (debug & 4)
109: say3("Moving %s to %s.\n", from, to);
110: #endif
111: if (link(from, to) < 0) { /* different file system? */
112: Reg4 int tofd;
113:
114: tofd = creat(to, 0666);
115: if (tofd < 0) {
116: say4("Can't create %s, output is in %s: %s\n",
117: to, from, strerror(errno));
118: return -1;
119: }
120: fromfd = open(from, 0);
121: if (fromfd < 0)
122: pfatal2("internal error, can't reopen %s", from);
123: while ((i=read(fromfd, buf, sizeof buf)) > 0)
124: if (write(tofd, buf, i) != i)
125: pfatal1("write failed");
126: Close(fromfd);
127: Close(tofd);
128: }
129: Unlink(from);
130: return 0;
131: }
132:
133: /* Copy a file. */
134:
135: void
136: copy_file(from,to)
137: char *from, *to;
138: {
139: Reg3 int tofd;
140: Reg2 int fromfd;
141: Reg1 int i;
142:
143: tofd = creat(to, 0666);
144: if (tofd < 0)
145: pfatal2("can't create %s", to);
146: fromfd = open(from, 0);
147: if (fromfd < 0)
148: pfatal2("internal error, can't reopen %s", from);
149: while ((i=read(fromfd, buf, sizeof buf)) > 0)
150: if (write(tofd, buf, i) != i)
151: pfatal2("write to %s failed", to);
152: Close(fromfd);
153: Close(tofd);
154: }
155:
156: /* Allocate a unique area for a string. */
157:
158: char *
159: savestr(s)
160: Reg1 char *s;
161: {
162: Reg3 char *rv;
163: Reg2 char *t;
164:
165: if (!s)
166: s = "Oops";
167: t = s;
168: while (*t++);
169: rv = malloc((MEM) (t - s));
170: if (rv == Nullch) {
171: if (using_plan_a)
172: out_of_mem = TRUE;
173: else
174: fatal1("out of memory\n");
175: }
176: else {
177: t = rv;
178: while (*t++ = *s++);
179: }
180: return rv;
181: }
182:
183: #if defined(lint) && defined(CANVARARG)
184:
185: /*VARARGS ARGSUSED*/
186: say(pat) char *pat; { ; }
187: /*VARARGS ARGSUSED*/
188: fatal(pat) char *pat; { ; }
189: /*VARARGS ARGSUSED*/
190: pfatal(pat) char *pat; { ; }
191: /*VARARGS ARGSUSED*/
192: ask(pat) char *pat; { ; }
193:
194: #else
195:
196: /* Vanilla terminal output (buffered). */
197:
198: void
199: say(pat,arg1,arg2,arg3)
200: char *pat;
201: long arg1,arg2,arg3;
202: {
203: fprintf(stderr, pat, arg1, arg2, arg3);
204: Fflush(stderr);
205: }
206:
207: /* Terminal output, pun intended. */
208:
209: void /* very void */
210: fatal(pat,arg1,arg2,arg3)
211: char *pat;
212: long arg1,arg2,arg3;
213: {
214: fprintf(stderr, "patch: **** ");
215: fprintf(stderr, pat, arg1, arg2, arg3);
216: my_exit(1);
217: }
218:
219: /* Say something from patch, something from the system, then silence . . . */
220:
221: void /* very void */
222: pfatal(pat,arg1,arg2,arg3)
223: char *pat;
224: long arg1,arg2,arg3;
225: {
226: int errnum = errno;
227:
228: fprintf(stderr, "patch: **** ");
229: fprintf(stderr, pat, arg1, arg2, arg3);
230: fprintf(stderr, ": %s\n", strerror(errnum));
231: my_exit(1);
232: }
233:
234: /* Get a response from the user, somehow or other. */
235:
236: void
237: ask(pat,arg1,arg2,arg3)
238: char *pat;
239: long arg1,arg2,arg3;
240: {
241: int ttyfd;
242: int r;
243: bool tty2 = isatty(2);
244:
245: Sprintf(buf, pat, arg1, arg2, arg3);
246: Fflush(stderr);
247: write(2, buf, strlen(buf));
248: if (tty2) { /* might be redirected to a file */
249: r = read(2, buf, sizeof buf);
250: }
251: else if (isatty(1)) { /* this may be new file output */
252: Fflush(stdout);
253: write(1, buf, strlen(buf));
254: r = read(1, buf, sizeof buf);
255: }
256: else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
257: /* might be deleted or unwriteable */
258: write(ttyfd, buf, strlen(buf));
259: r = read(ttyfd, buf, sizeof buf);
260: Close(ttyfd);
261: }
262: else if (isatty(0)) { /* this is probably patch input */
263: Fflush(stdin);
264: write(0, buf, strlen(buf));
265: r = read(0, buf, sizeof buf);
266: }
267: else { /* no terminal at all--default it */
268: buf[0] = '\n';
269: r = 1;
270: }
271: if (r <= 0)
272: buf[0] = 0;
273: else
274: buf[r] = '\0';
275: if (!tty2)
276: say1(buf);
277: }
278: #endif /* lint */
279:
280: /* How to handle certain events when not in a critical region. */
281:
282: void
283: set_signals(reset)
284: int reset;
285: {
286: #ifndef lint
287: #ifdef VOIDSIG
288: static void (*hupval)(),(*intval)();
289: #else
290: static int (*hupval)(),(*intval)();
291: #endif
292:
293: if (!reset) {
294: hupval = signal(SIGHUP, SIG_IGN);
295: if (hupval != SIG_IGN)
296: #ifdef VOIDSIG
297: hupval = my_exit;
298: #else
299: hupval = (int(*)())my_exit;
300: #endif
301: intval = signal(SIGINT, SIG_IGN);
302: if (intval != SIG_IGN)
303: #ifdef VOIDSIG
304: intval = my_exit;
305: #else
306: intval = (int(*)())my_exit;
307: #endif
308: }
309: Signal(SIGHUP, hupval);
310: Signal(SIGINT, intval);
311: #endif
312: }
313:
314: /* How to handle certain events when in a critical region. */
315:
316: void
317: ignore_signals()
318: {
319: #ifndef lint
320: Signal(SIGHUP, SIG_IGN);
321: Signal(SIGINT, SIG_IGN);
322: #endif
323: }
324:
325: /* Make sure we'll have the directories to create a file.
326: If `striplast' is TRUE, ignore the last element of `filename'. */
327:
328: void
329: makedirs(filename,striplast)
330: Reg1 char *filename;
331: bool striplast;
332: {
333: char tmpbuf[256];
334: Reg2 char *s = tmpbuf;
335: char *dirv[20]; /* Point to the NULs between elements. */
336: Reg3 int i;
337: Reg4 int dirvp = 0; /* Number of finished entries in dirv. */
338:
339: /* Copy `filename' into `tmpbuf' with a NUL instead of a slash
340: between the directories. */
341: while (*filename) {
342: if (*filename == '/') {
343: filename++;
344: dirv[dirvp++] = s;
345: *s++ = '\0';
346: }
347: else {
348: *s++ = *filename++;
349: }
350: }
351: *s = '\0';
352: dirv[dirvp] = s;
353: if (striplast)
354: dirvp--;
355: if (dirvp < 0)
356: return;
357:
358: strcpy(buf, "mkdir");
359: s = buf;
360: for (i=0; i<=dirvp; i++) {
361: struct stat sbuf;
362:
363: if (stat(tmpbuf, &sbuf) && errno == ENOENT) {
364: while (*s) s++;
365: *s++ = ' ';
366: strcpy(s, tmpbuf);
367: }
368: *dirv[i] = '/';
369: }
370: if (s != buf)
371: system(buf);
372: }
373:
374: /* Make filenames more reasonable. */
375:
376: char *
377: fetchname(at,strip_leading,assume_exists)
378: char *at;
379: int strip_leading;
380: int assume_exists;
381: {
382: char *fullname;
383: char *name;
384: Reg1 char *t;
385: char tmpbuf[200];
386: int sleading = strip_leading;
387:
388: if (!at)
389: return Nullch;
390: while (isspace(*at))
391: at++;
392: #ifdef DEBUGGING
393: if (debug & 128)
394: say4("fetchname %s %d %d\n",at,strip_leading,assume_exists);
395: #endif
396: if (strnEQ(at, "/dev/null", 9)) /* so files can be created by diffing */
397: return Nullch; /* against /dev/null. */
398: name = fullname = t = savestr(at);
399:
400: /* Strip off up to `sleading' leading slashes and null terminate. */
401: for (; *t && !isspace(*t); t++)
402: if (*t == '/')
403: if (--sleading >= 0)
404: name = t+1;
405: *t = '\0';
406:
407: /* If no -p option was given (957 is the default value!),
408: we were given a relative pathname,
409: and the leading directories that we just stripped off all exist,
410: put them back on. */
411: if (strip_leading == 957 && name != fullname && *fullname != '/') {
412: name[-1] = '\0';
413: if (stat(fullname, &filestat) == 0 && S_ISDIR (filestat.st_mode)) {
414: name[-1] = '/';
415: name=fullname;
416: }
417: }
418:
419: name = savestr(name);
420: free(fullname);
421:
422: if (stat(name, &filestat) && !assume_exists) {
423: char *filebase = basename(name);
424: int pathlen = filebase - name;
425:
426: /* Put any leading path into `tmpbuf'. */
427: strncpy(tmpbuf, name, pathlen);
428:
429: #define try(f, a1, a2) (Sprintf(tmpbuf + pathlen, f, a1, a2), stat(tmpbuf, &filestat) == 0)
430: if ( try("RCS/%s%s", filebase, RCSSUFFIX)
431: || try("RCS/%s" , filebase, 0)
432: || try( "%s%s", filebase, RCSSUFFIX)
433: || try("SCCS/%s%s", SCCSPREFIX, filebase)
434: || try( "%s%s", SCCSPREFIX, filebase))
435: return name;
436: free(name);
437: name = Nullch;
438: }
439:
440: return name;
441: }