Annotation of src/usr.bin/mg/fileio.c, Revision 1.110
1.110 ! op 1: /* $OpenBSD: fileio.c,v 1.109 2023/03/08 04:43:11 guenther Exp $ */
1.50 kjell 2:
3: /* This file is in the public domain. */
1.10 niklas 4:
1.1 deraadt 5: /*
1.7 millert 6: * POSIX fileio.c
1.1 deraadt 7: */
1.56 deraadt 8:
1.99 bcallah 9: #include <sys/queue.h>
10: #include <sys/resource.h>
1.72 kjell 11: #include <sys/stat.h>
1.56 deraadt 12: #include <sys/time.h>
1.99 bcallah 13: #include <sys/types.h>
1.53 kjell 14: #include <sys/wait.h>
1.99 bcallah 15: #include <dirent.h>
16: #include <errno.h>
1.72 kjell 17: #include <fcntl.h>
1.33 vincent 18: #include <limits.h>
1.72 kjell 19: #include <pwd.h>
1.99 bcallah 20: #include <signal.h>
21: #include <stdio.h>
22: #include <stdlib.h>
1.21 vincent 23: #include <string.h>
1.9 millert 24: #include <unistd.h>
1.1 deraadt 25:
1.99 bcallah 26: #include "def.h"
1.72 kjell 27: #include "kbd.h"
1.93 jasper 28: #include "pathnames.h"
1.72 kjell 29:
1.91 lum 30: static char *bkuplocation(const char *);
31: static int bkupleavetmp(const char *);
32:
33: static char *bkupdir;
1.93 jasper 34: static int leavetmp = 0; /* 1 = leave any '~' files in tmp dir */
1.91 lum 35:
1.1 deraadt 36: /*
37: * Open a file for reading.
38: */
1.7 millert 39: int
1.89 lum 40: ffropen(FILE ** ffp, const char *fn, struct buffer *bp)
1.7 millert 41: {
1.89 lum 42: if ((*ffp = fopen(fn, "r")) == NULL) {
1.46 jfb 43: if (errno == ENOENT)
44: return (FIOFNF);
45: return (FIOERR);
46: }
1.53 kjell 47:
48: /* If 'fn' is a directory open it with dired. */
1.54 kjell 49: if (fisdir(fn) == TRUE)
1.53 kjell 50: return (FIODIR);
51:
1.89 lum 52: ffstat(*ffp, bp);
1.93 jasper 53:
1.82 kjell 54: return (FIOSUC);
55: }
56:
57: /*
58: * Update stat/dirty info
59: */
60: void
1.89 lum 61: ffstat(FILE *ffp, struct buffer *bp)
1.82 kjell 62: {
63: struct stat sb;
64:
65: if (bp && fstat(fileno(ffp), &sb) == 0) {
1.7 millert 66: /* set highorder bit to make sure this isn't all zero */
1.82 kjell 67: bp->b_fi.fi_mode = sb.st_mode | 0x8000;
68: bp->b_fi.fi_uid = sb.st_uid;
69: bp->b_fi.fi_gid = sb.st_gid;
70: bp->b_fi.fi_mtime = sb.st_mtimespec;
71: /* Clear the ignore flag */
72: bp->b_flag &= ~(BFIGNDIRTY | BFDIRTY);
1.1 deraadt 73: }
1.82 kjell 74: }
1.53 kjell 75:
1.82 kjell 76: /*
77: * Update the status/dirty info. If there is an error,
78: * there's not a lot we can do.
79: */
80: int
81: fupdstat(struct buffer *bp)
82: {
1.89 lum 83: FILE *ffp;
84:
1.82 kjell 85: if ((ffp = fopen(bp->b_fname, "r")) == NULL) {
86: if (errno == ENOENT)
87: return (FIOFNF);
88: return (FIOERR);
89: }
1.89 lum 90: ffstat(ffp, bp);
91: (void)ffclose(ffp, bp);
1.1 deraadt 92: return (FIOSUC);
93: }
94:
95: /*
96: * Open a file for writing.
97: */
1.7 millert 98: int
1.89 lum 99: ffwopen(FILE ** ffp, const char *fn, struct buffer *bp)
1.7 millert 100: {
1.49 db 101: int fd;
1.66 kjell 102: mode_t fmode = DEFFILEMODE;
1.7 millert 103:
1.24 deraadt 104: if (bp && bp->b_fi.fi_mode)
1.66 kjell 105: fmode = bp->b_fi.fi_mode & 07777;
1.24 deraadt 106:
1.66 kjell 107: fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, fmode);
1.24 deraadt 108: if (fd == -1) {
109: ffp = NULL;
1.97 lum 110: dobeep();
1.21 vincent 111: ewprintf("Cannot open file for writing : %s", strerror(errno));
1.1 deraadt 112: return (FIOERR);
1.34 deraadt 113: }
1.24 deraadt 114:
1.89 lum 115: if ((*ffp = fdopen(fd, "w")) == NULL) {
1.97 lum 116: dobeep();
1.24 deraadt 117: ewprintf("Cannot open file for writing : %s", strerror(errno));
118: close(fd);
1.34 deraadt 119: return (FIOERR);
1.1 deraadt 120: }
1.7 millert 121:
122: /*
123: * If we have file information, use it. We don't bother to check for
124: * errors, because there's no a lot we can do about it. Certainly
1.24 deraadt 125: * trying to change ownership will fail if we aren't root. That's
1.7 millert 126: * probably OK. If we don't have info, no need to get it, since any
127: * future writes will do the same thing.
1.1 deraadt 128: */
129: if (bp && bp->b_fi.fi_mode) {
1.28 deraadt 130: fchmod(fd, bp->b_fi.fi_mode & 07777);
131: fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
1.1 deraadt 132: }
133: return (FIOSUC);
134: }
135:
136: /*
137: * Close a file.
138: */
1.7 millert 139: int
1.89 lum 140: ffclose(FILE *ffp, struct buffer *bp)
1.7 millert 141: {
1.85 lum 142: if (fclose(ffp) == 0)
143: return (FIOSUC);
1.93 jasper 144: return (FIOERR);
1.1 deraadt 145: }
146:
147: /*
1.41 vincent 148: * Write a buffer to the already opened file. bp points to the
1.1 deraadt 149: * buffer. Return the status.
150: */
1.7 millert 151: int
1.106 lum 152: ffputbuf(FILE *ffp, struct buffer *bp, int eobnl)
1.1 deraadt 153: {
1.106 lum 154: struct line *lp, *lpend;
1.7 millert 155:
1.77 kjell 156: lpend = bp->b_headp;
1.106 lum 157:
1.41 vincent 158: for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
159: if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
1.97 lum 160: dobeep();
1.41 vincent 161: ewprintf("Write I/O error");
1.49 db 162: return (FIOERR);
1.7 millert 163: }
1.41 vincent 164: if (lforw(lp) != lpend) /* no implied \n on last line */
1.108 lum 165: putc(*bp->b_nlchr, ffp);
1.48 deraadt 166: }
1.106 lum 167: if (eobnl) {
168: lnewline_at(lback(lpend), llength(lback(lpend)));
1.108 lum 169: putc(*bp->b_nlchr, ffp);
1.42 vincent 170: }
1.7 millert 171: return (FIOSUC);
1.1 deraadt 172: }
173:
174: /*
175: * Read a line from a file, and store the bytes
176: * in the supplied buffer. Stop on end of file or end of
177: * line. When FIOEOF is returned, there is a valid line
178: * of data without the normally implied \n.
1.80 kjell 179: * If the line length exceeds nbuf, FIOLONG is returned.
1.1 deraadt 180: */
1.7 millert 181: int
1.89 lum 182: ffgetline(FILE *ffp, char *buf, int nbuf, int *nbytes)
1.1 deraadt 183: {
1.16 mickey 184: int c, i;
1.1 deraadt 185:
186: i = 0;
1.108 lum 187: while ((c = getc(ffp)) != EOF && c != *curbp->b_nlchr) {
1.1 deraadt 188: buf[i++] = c;
1.7 millert 189: if (i >= nbuf)
1.49 db 190: return (FIOLONG);
1.1 deraadt 191: }
1.7 millert 192: if (c == EOF && ferror(ffp) != FALSE) {
1.97 lum 193: dobeep();
1.1 deraadt 194: ewprintf("File read error");
1.49 db 195: return (FIOERR);
1.1 deraadt 196: }
197: *nbytes = i;
1.49 db 198: return (c == EOF ? FIOEOF : FIOSUC);
1.1 deraadt 199: }
200:
201: /*
1.9 millert 202: * Make a backup copy of "fname". On Unix the backup has the same
203: * name as the original file, with a "~" on the end; this seems to
204: * be newest of the new-speak. The error handling is all in "file.c".
205: * We do a copy instead of a rename since otherwise another process
206: * with an open fd will get the backup, not the new file. This is
207: * a problem when using mg with things like crontab and vipw.
1.1 deraadt 208: */
1.7 millert 209: int
1.25 vincent 210: fbackupfile(const char *fn)
1.7 millert 211: {
1.49 db 212: struct stat sb;
1.104 florian 213: struct timespec new_times[2];
1.49 db 214: int from, to, serrno;
215: ssize_t nread;
216: char buf[BUFSIZ];
1.91 lum 217: char *nname, *tname, *bkpth;
1.1 deraadt 218:
1.35 vincent 219: if (stat(fn, &sb) == -1) {
1.97 lum 220: dobeep();
1.35 vincent 221: ewprintf("Can't stat %s : %s", fn, strerror(errno));
222: return (FALSE);
223: }
224:
1.91 lum 225: if ((bkpth = bkuplocation(fn)) == NULL)
226: return (FALSE);
227:
228: if (asprintf(&nname, "%s~", bkpth) == -1) {
1.97 lum 229: dobeep();
1.90 lum 230: ewprintf("Can't allocate backup file name : %s", strerror(errno));
1.91 lum 231: free(bkpth);
1.44 millert 232: return (ABORT);
233: }
1.91 lum 234: if (asprintf(&tname, "%s.XXXXXXXXXX", bkpth) == -1) {
1.97 lum 235: dobeep();
1.44 millert 236: ewprintf("Can't allocate temp file name : %s", strerror(errno));
1.91 lum 237: free(bkpth);
1.44 millert 238: free(nname);
1.1 deraadt 239: return (ABORT);
1.9 millert 240: }
1.91 lum 241: free(bkpth);
1.9 millert 242:
1.21 vincent 243: if ((from = open(fn, O_RDONLY)) == -1) {
244: free(nname);
1.44 millert 245: free(tname);
1.1 deraadt 246: return (FALSE);
1.21 vincent 247: }
1.44 millert 248: to = mkstemp(tname);
1.9 millert 249: if (to == -1) {
250: serrno = errno;
251: close(from);
1.21 vincent 252: free(nname);
1.44 millert 253: free(tname);
1.9 millert 254: errno = serrno;
255: return (FALSE);
256: }
257: while ((nread = read(from, buf, sizeof(buf))) > 0) {
1.70 deraadt 258: if (write(to, buf, (size_t)nread) != nread) {
1.40 vincent 259: nread = -1;
260: break;
1.9 millert 261: }
1.1 deraadt 262: }
1.9 millert 263: serrno = errno;
1.44 millert 264: (void) fchmod(to, (sb.st_mode & 0777));
1.100 jasper 265:
266: /* copy the mtime to the backupfile */
267: new_times[0] = sb.st_atim;
268: new_times[1] = sb.st_mtim;
269: futimens(to, new_times);
270:
1.9 millert 271: close(from);
272: close(to);
1.21 vincent 273: if (nread == -1) {
1.44 millert 274: if (unlink(tname) == -1)
1.21 vincent 275: ewprintf("Can't unlink temp : %s", strerror(errno));
1.44 millert 276: } else {
277: if (rename(tname, nname) == -1) {
278: ewprintf("Can't rename temp : %s", strerror(errno));
279: (void) unlink(tname);
1.45 henning 280: nread = -1;
1.44 millert 281: }
1.21 vincent 282: }
1.1 deraadt 283: free(nname);
1.44 millert 284: free(tname);
1.9 millert 285: errno = serrno;
1.22 deraadt 286:
1.9 millert 287: return (nread == -1 ? FALSE : TRUE);
1.1 deraadt 288: }
289:
290: /*
1.73 kjell 291: * Convert "fn" to a canonicalized absolute filename, replacing
292: * a leading ~/ with the user's home dir, following symlinks, and
1.96 lum 293: * remove all occurrences of /./ and /../
1.1 deraadt 294: */
1.7 millert 295: char *
1.74 jason 296: adjustname(const char *fn, int slashslash)
1.1 deraadt 297: {
1.98 guenther 298: static char fnb[PATH_MAX];
1.74 jason 299: const char *cp, *ep = NULL;
1.92 lum 300: char *path;
1.74 jason 301:
1.75 kjell 302: if (slashslash == TRUE) {
1.74 jason 303: cp = fn + strlen(fn) - 1;
304: for (; cp >= fn; cp--) {
305: if (ep && (*cp == '/')) {
306: fn = ep;
307: break;
308: }
309: if (*cp == '/' || *cp == '~')
310: ep = cp;
311: else
312: ep = NULL;
313: }
314: }
1.92 lum 315: if ((path = expandtilde(fn)) == NULL)
1.57 kjell 316: return (NULL);
1.33 vincent 317:
1.47 henning 318: if (realpath(path, fnb) == NULL)
1.57 kjell 319: (void)strlcpy(fnb, path, sizeof(fnb));
1.47 henning 320:
1.92 lum 321: free(path);
1.47 henning 322: return (fnb);
1.1 deraadt 323: }
324:
325: /*
326: * Find a startup file for the user and return its name. As a service
327: * to other pieces of code that may want to find a startup file (like
328: * the terminal driver in particular), accepts a suffix to be appended
329: * to the startup file name.
330: */
331: char *
1.107 lum 332: startupfile(char *suffix, char *conffile)
1.1 deraadt 333: {
1.49 db 334: static char file[NFILEN];
1.16 mickey 335: char *home;
1.61 kjell 336: int ret;
1.12 art 337:
338: if ((home = getenv("HOME")) == NULL || *home == '\0')
339: goto nohome;
1.1 deraadt 340:
1.107 lum 341: if (conffile != NULL) {
1.110 ! op 342: (void)strlcpy(file, conffile, NFILEN);
1.107 lum 343: } else if (suffix == NULL) {
1.93 jasper 344: ret = snprintf(file, sizeof(file), _PATH_MG_STARTUP, home);
1.61 kjell 345: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 346: return (NULL);
1.12 art 347: } else {
1.93 jasper 348: ret = snprintf(file, sizeof(file), _PATH_MG_TERM, home, suffix);
1.61 kjell 349: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 350: return (NULL);
1.1 deraadt 351: }
1.12 art 352:
353: if (access(file, R_OK) == 0)
1.32 vincent 354: return (file);
1.12 art 355: nohome:
356: #ifdef STARTUPFILE
1.27 millert 357: if (suffix == NULL) {
1.61 kjell 358: ret = snprintf(file, sizeof(file), "%s", STARTUPFILE);
359: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 360: return (NULL);
1.12 art 361: } else {
1.61 kjell 362: ret = snprintf(file, sizeof(file), "%s%s", STARTUPFILE,
363: suffix);
364: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 365: return (NULL);
1.12 art 366: }
367:
368: if (access(file, R_OK) == 0)
1.32 vincent 369: return (file);
1.61 kjell 370: #endif /* STARTUPFILE */
1.32 vincent 371: return (NULL);
1.1 deraadt 372: }
373:
1.7 millert 374: int
1.27 millert 375: copy(char *frname, char *toname)
1.1 deraadt 376: {
1.70 deraadt 377: int ifd, ofd;
1.49 db 378: char buf[BUFSIZ];
1.66 kjell 379: mode_t fmode = DEFFILEMODE; /* XXX?? */
1.49 db 380: struct stat orig;
1.70 deraadt 381: ssize_t sr;
1.30 vincent 382:
383: if ((ifd = open(frname, O_RDONLY)) == -1)
384: return (FALSE);
385: if (fstat(ifd, &orig) == -1) {
1.97 lum 386: dobeep();
1.30 vincent 387: ewprintf("fstat: %s", strerror(errno));
388: close(ifd);
389: return (FALSE);
390: }
391:
1.66 kjell 392: if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, fmode)) == -1) {
1.30 vincent 393: close(ifd);
394: return (FALSE);
395: }
1.70 deraadt 396: while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
397: if (write(ofd, buf, (size_t)sr) != sr) {
1.30 vincent 398: ewprintf("write error : %s", strerror(errno));
399: break;
400: }
401: }
402: if (fchmod(ofd, orig.st_mode) == -1)
403: ewprintf("Cannot set original mode : %s", strerror(errno));
1.1 deraadt 404:
1.70 deraadt 405: if (sr == -1) {
1.30 vincent 406: ewprintf("Read error : %s", strerror(errno));
407: close(ifd);
408: close(ofd);
409: return (FALSE);
1.7 millert 410: }
1.30 vincent 411: /*
1.32 vincent 412: * It is "normal" for this to fail since we can't guarantee that
1.49 db 413: * we will be running as root.
1.30 vincent 414: */
415: if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
416: ewprintf("Cannot set owner : %s", strerror(errno));
417:
418: (void) close(ifd);
419: (void) close(ofd);
420:
421: return (TRUE);
1.7 millert 422: }
1.1 deraadt 423:
1.7 millert 424: /*
1.1 deraadt 425: * return list of file names that match the name in buf.
426: */
1.62 deraadt 427: struct list *
1.25 vincent 428: make_file_list(char *buf)
1.7 millert 429: {
1.16 mickey 430: char *dir, *file, *cp;
1.71 kjell 431: size_t len, preflen;
432: int ret;
1.16 mickey 433: DIR *dirp;
434: struct dirent *dent;
1.68 kjell 435: struct list *last, *current;
436: char fl_name[NFILEN + 2];
1.49 db 437: char prefixx[NFILEN + 1];
1.7 millert 438:
439: /*
1.79 deraadt 440: * We need three different strings:
1.72 kjell 441:
442: * dir - the name of the directory containing what the user typed.
443: * Must be a real unix file name, e.g. no ~user, etc..
444: * Must not end in /.
445: * prefix - the portion of what the user typed that is before the
446: * names we are going to find in the directory. Must have a
447: * trailing / if the user typed it.
448: * names from the directory - We open dir, and return prefix
1.7 millert 449: * concatenated with names.
450: */
451:
452: /* first we get a directory name we can look up */
453: /*
454: * Names ending in . are potentially odd, because adjustname will
1.71 kjell 455: * treat foo/bar/.. as a foo/, whereas we are
1.7 millert 456: * interested in names starting with ..
457: */
458: len = strlen(buf);
1.71 kjell 459: if (len && buf[len - 1] == '.') {
1.7 millert 460: buf[len - 1] = 'x';
1.74 jason 461: dir = adjustname(buf, TRUE);
1.7 millert 462: buf[len - 1] = '.';
463: } else
1.74 jason 464: dir = adjustname(buf, TRUE);
1.33 vincent 465: if (dir == NULL)
1.36 vincent 466: return (NULL);
1.7 millert 467: /*
468: * If the user typed a trailing / or the empty string
469: * he wants us to use his file spec as a directory name.
470: */
1.71 kjell 471: if (len && buf[len - 1] != '/') {
1.7 millert 472: file = strrchr(dir, '/');
473: if (file) {
1.69 kjell 474: *file = '\0';
475: if (*dir == '\0')
1.7 millert 476: dir = "/";
1.49 db 477: } else
1.7 millert 478: return (NULL);
1.1 deraadt 479: }
1.7 millert 480: /* Now we get the prefix of the name the user typed. */
1.67 kjell 481: if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
482: return (NULL);
1.7 millert 483: cp = strrchr(prefixx, '/');
484: if (cp == NULL)
1.67 kjell 485: prefixx[0] = '\0';
1.7 millert 486: else
1.67 kjell 487: cp[1] = '\0';
1.7 millert 488:
489: preflen = strlen(prefixx);
1.49 db 490: /* cp is the tail of buf that really needs to be compared. */
1.7 millert 491: cp = buf + preflen;
492: len = strlen(cp);
493:
494: /*
495: * Now make sure that file names will fit in the buffers allocated.
496: * SV files are fairly short. For BSD, something more general would
497: * be required.
498: */
1.71 kjell 499: if (preflen > NFILEN - MAXNAMLEN)
1.7 millert 500: return (NULL);
501:
502: /* loop over the specified directory, making up the list of files */
503:
504: /*
505: * Note that it is worth our time to filter out names that don't
506: * match, even though our caller is going to do so again, and to
507: * avoid doing the stat if completion is being done, because stat'ing
508: * every file in the directory is relatively expensive.
509: */
1.1 deraadt 510:
1.11 art 511: dirp = opendir(dir);
512: if (dirp == NULL)
1.7 millert 513: return (NULL);
514: last = NULL;
1.11 art 515:
516: while ((dent = readdir(dirp)) != NULL) {
1.18 art 517: int isdir;
1.83 kjell 518: if (strncmp(cp, dent->d_name, len) != 0)
1.11 art 519: continue;
1.18 art 520: isdir = 0;
521: if (dent->d_type == DT_DIR) {
522: isdir = 1;
523: } else if (dent->d_type == DT_LNK ||
524: dent->d_type == DT_UNKNOWN) {
525: struct stat statbuf;
526:
1.101 guenther 527: if (fstatat(dirfd(dirp), dent->d_name, &statbuf, 0) < 0)
1.18 art 528: continue;
1.78 otto 529: if (S_ISDIR(statbuf.st_mode))
1.18 art 530: isdir = 1;
531: }
532:
1.68 kjell 533: if ((current = malloc(sizeof(struct list))) == NULL) {
534: free_file_list(last);
1.86 lum 535: closedir(dirp);
1.68 kjell 536: return (NULL);
537: }
538: ret = snprintf(fl_name, sizeof(fl_name),
1.61 kjell 539: "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
1.68 kjell 540: if (ret < 0 || ret >= sizeof(fl_name)) {
1.11 art 541: free(current);
1.7 millert 542: continue;
543: }
1.68 kjell 544: current->l_next = last;
545: current->l_name = strdup(fl_name);
546: last = current;
1.1 deraadt 547: }
1.11 art 548: closedir(dirp);
1.1 deraadt 549:
1.7 millert 550: return (last);
1.54 kjell 551: }
552:
553: /*
554: * Test if a supplied filename refers to a directory
555: * Returns ABORT on error, TRUE if directory. FALSE otherwise
556: */
557: int
558: fisdir(const char *fname)
559: {
560: struct stat statbuf;
561:
562: if (stat(fname, &statbuf) != 0)
563: return (ABORT);
564:
565: if (S_ISDIR(statbuf.st_mode))
566: return (TRUE);
567:
568: return (FALSE);
1.82 kjell 569: }
570:
571: /*
572: * Check the mtime of the supplied filename.
573: * Return TRUE if last mtime matches, FALSE if not,
574: * If the stat fails, return TRUE and try the save anyway
575: */
576: int
577: fchecktime(struct buffer *bp)
578: {
579: struct stat sb;
580:
581: if (stat(bp->b_fname, &sb) == -1)
582: return (TRUE);
583:
584: if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtimespec.tv_sec ||
585: bp->b_fi.fi_mtime.tv_nsec != sb.st_mtimespec.tv_nsec)
586: return (FALSE);
587:
588: return (TRUE);
1.93 jasper 589:
1.91 lum 590: }
591:
592: /*
593: * Location of backup file. This function creates the correct path.
594: */
595: static char *
596: bkuplocation(const char *fn)
597: {
598: struct stat sb;
599: char *ret;
600:
601: if (bkupdir != NULL && (stat(bkupdir, &sb) == 0) &&
602: S_ISDIR(sb.st_mode) && !bkupleavetmp(fn)) {
603: char fname[NFILEN];
604: const char *c;
605: int i = 0, len;
606:
607: c = fn;
608: len = strlen(bkupdir);
609:
610: while (*c != '\0') {
611: /* Make sure we don't go over combined:
612: * strlen(bkupdir + '/' + fname + '\0')
613: */
614: if (i >= NFILEN - len - 1)
615: return (NULL);
616: if (*c == '/') {
617: fname[i] = '!';
618: } else if (*c == '!') {
619: if (i >= NFILEN - len - 2)
620: return (NULL);
621: fname[i++] = '!';
622: fname[i] = '!';
623: } else
624: fname[i] = *c;
625: i++;
626: c++;
627: }
628: fname[i] = '\0';
629: if (asprintf(&ret, "%s/%s", bkupdir, fname) == -1)
630: return (NULL);
631:
632: } else if ((ret = strndup(fn, NFILEN)) == NULL)
633: return (NULL);
634:
635: return (ret);
636: }
637:
638: int
639: backuptohomedir(int f, int n)
640: {
1.93 jasper 641: const char *c = _PATH_MG_DIR;
1.91 lum 642: char *p;
643:
644: if (bkupdir == NULL) {
645: p = adjustname(c, TRUE);
646: bkupdir = strndup(p, NFILEN);
647: if (bkupdir == NULL)
648: return(FALSE);
649:
650: if (mkdir(bkupdir, 0700) == -1 && errno != EEXIST) {
651: free(bkupdir);
652: bkupdir = NULL;
653: }
654: } else {
655: free(bkupdir);
656: bkupdir = NULL;
657: }
658:
659: return (TRUE);
660: }
661:
662: /*
663: * For applications that use mg as the editor and have a desire to keep
1.102 tedu 664: * '~' files in /tmp, toggle the location: /tmp | ~/.mg.d
1.91 lum 665: */
666: int
667: toggleleavetmp(int f, int n)
668: {
669: leavetmp = !leavetmp;
670:
671: return (TRUE);
672: }
673:
674: /*
675: * Returns TRUE if fn is located in the temp directory and we want to save
676: * those backups there.
677: */
678: int
679: bkupleavetmp(const char *fn)
680: {
681: if (!leavetmp)
682: return(FALSE);
683:
1.103 tedu 684: if (strncmp(fn, "/tmp", 4) == 0)
1.91 lum 685: return (TRUE);
686:
687: return (FALSE);
1.92 lum 688: }
689:
1.93 jasper 690: /*
1.92 lum 691: * Expand file names beginning with '~' if appropriate:
692: * 1, if ./~fn exists, continue without expanding tilde.
693: * 2, else, if username 'fn' exists, expand tilde with home directory path.
694: * 3, otherwise, continue and create new buffer called ~fn.
695: */
696: char *
697: expandtilde(const char *fn)
698: {
699: struct passwd *pw;
700: struct stat statbuf;
701: const char *cp;
1.94 lum 702: char user[LOGIN_NAME_MAX], path[NFILEN];
1.105 florian 703: char *ret;
1.92 lum 704: size_t ulen, plen;
705:
706: path[0] = '\0';
707:
708: if (fn[0] != '~' || stat(fn, &statbuf) == 0) {
709: if ((ret = strndup(fn, NFILEN)) == NULL)
710: return (NULL);
711: return(ret);
712: }
713: cp = strchr(fn, '/');
714: if (cp == NULL)
715: cp = fn + strlen(fn); /* point to the NUL byte */
716: ulen = cp - &fn[1];
717: if (ulen >= sizeof(user)) {
718: if ((ret = strndup(fn, NFILEN)) == NULL)
719: return (NULL);
720: return(ret);
721: }
1.105 florian 722: if (ulen == 0) /* ~/ or ~ */
723: pw = getpwuid(geteuid());
724: else { /* ~user/ or ~user */
1.92 lum 725: memcpy(user, &fn[1], ulen);
726: user[ulen] = '\0';
1.105 florian 727: pw = getpwnam(user);
1.92 lum 728: }
729: if (pw != NULL) {
730: plen = strlcpy(path, pw->pw_dir, sizeof(path));
731: if (plen == 0 || path[plen - 1] != '/') {
732: if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
1.97 lum 733: dobeep();
1.92 lum 734: ewprintf("Path too long");
735: return (NULL);
736: }
737: }
738: fn = cp;
739: if (*fn == '/')
740: fn++;
741: }
742: if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
1.97 lum 743: dobeep();
1.92 lum 744: ewprintf("Path too long");
745: return (NULL);
746: }
747: if ((ret = strndup(path, NFILEN)) == NULL)
748: return (NULL);
749:
750: return (ret);
1.1 deraadt 751: }
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