Annotation of src/usr.bin/mg/fileio.c, Revision 1.112
1.112 ! guenther 1: /* $OpenBSD: fileio.c,v 1.111 2023/03/30 19:00:02 op 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;
1.112 ! guenther 70: bp->b_fi.fi_mtime = sb.st_mtim;
1.82 kjell 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: */
1.111 op 331: FILE *
332: startupfile(char *suffix, char *conffile, char *path, size_t len)
1.1 deraadt 333: {
1.111 op 334: FILE *ffp;
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) {
1.111 op 342: (void)strlcpy(path, conffile, len);
1.107 lum 343: } else if (suffix == NULL) {
1.111 op 344: ret = snprintf(path, len, _PATH_MG_STARTUP, home);
345: if (ret < 0 || ret >= len)
1.32 vincent 346: return (NULL);
1.12 art 347: } else {
1.111 op 348: ret = snprintf(path, len, _PATH_MG_TERM, home, suffix);
349: if (ret < 0 || ret >= len)
1.32 vincent 350: return (NULL);
1.1 deraadt 351: }
1.12 art 352:
1.111 op 353: ret = ffropen(&ffp, path, NULL);
354: if (ret == FIOSUC)
355: return (ffp);
356: if (ret == FIODIR)
357: (void)ffclose(ffp, NULL);
1.12 art 358: nohome:
359: #ifdef STARTUPFILE
1.27 millert 360: if (suffix == NULL) {
1.111 op 361: ret = snprintf(path, len, "%s", STARTUPFILE);
362: if (ret < 0 || ret >= len)
1.32 vincent 363: return (NULL);
1.12 art 364: } else {
1.111 op 365: ret = snprintf(path, len, "%s%s", STARTUPFILE,
1.61 kjell 366: suffix);
1.111 op 367: if (ret < 0 || ret >= len)
1.32 vincent 368: return (NULL);
1.12 art 369: }
370:
1.111 op 371: ret = ffropen(&ffp, path, NULL);
372: if (ret == FIOSUC)
373: return (ffp);
374: if (ret == FIODIR)
375: (void)ffclose(ffp, NULL);
1.61 kjell 376: #endif /* STARTUPFILE */
1.32 vincent 377: return (NULL);
1.1 deraadt 378: }
379:
1.7 millert 380: int
1.27 millert 381: copy(char *frname, char *toname)
1.1 deraadt 382: {
1.70 deraadt 383: int ifd, ofd;
1.49 db 384: char buf[BUFSIZ];
1.66 kjell 385: mode_t fmode = DEFFILEMODE; /* XXX?? */
1.49 db 386: struct stat orig;
1.70 deraadt 387: ssize_t sr;
1.30 vincent 388:
389: if ((ifd = open(frname, O_RDONLY)) == -1)
390: return (FALSE);
391: if (fstat(ifd, &orig) == -1) {
1.97 lum 392: dobeep();
1.30 vincent 393: ewprintf("fstat: %s", strerror(errno));
394: close(ifd);
395: return (FALSE);
396: }
397:
1.66 kjell 398: if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, fmode)) == -1) {
1.30 vincent 399: close(ifd);
400: return (FALSE);
401: }
1.70 deraadt 402: while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
403: if (write(ofd, buf, (size_t)sr) != sr) {
1.30 vincent 404: ewprintf("write error : %s", strerror(errno));
405: break;
406: }
407: }
408: if (fchmod(ofd, orig.st_mode) == -1)
409: ewprintf("Cannot set original mode : %s", strerror(errno));
1.1 deraadt 410:
1.70 deraadt 411: if (sr == -1) {
1.30 vincent 412: ewprintf("Read error : %s", strerror(errno));
413: close(ifd);
414: close(ofd);
415: return (FALSE);
1.7 millert 416: }
1.30 vincent 417: /*
1.32 vincent 418: * It is "normal" for this to fail since we can't guarantee that
1.49 db 419: * we will be running as root.
1.30 vincent 420: */
421: if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
422: ewprintf("Cannot set owner : %s", strerror(errno));
423:
424: (void) close(ifd);
425: (void) close(ofd);
426:
427: return (TRUE);
1.7 millert 428: }
1.1 deraadt 429:
1.7 millert 430: /*
1.1 deraadt 431: * return list of file names that match the name in buf.
432: */
1.62 deraadt 433: struct list *
1.25 vincent 434: make_file_list(char *buf)
1.7 millert 435: {
1.16 mickey 436: char *dir, *file, *cp;
1.71 kjell 437: size_t len, preflen;
438: int ret;
1.16 mickey 439: DIR *dirp;
440: struct dirent *dent;
1.68 kjell 441: struct list *last, *current;
442: char fl_name[NFILEN + 2];
1.49 db 443: char prefixx[NFILEN + 1];
1.7 millert 444:
445: /*
1.79 deraadt 446: * We need three different strings:
1.72 kjell 447:
448: * dir - the name of the directory containing what the user typed.
449: * Must be a real unix file name, e.g. no ~user, etc..
450: * Must not end in /.
451: * prefix - the portion of what the user typed that is before the
452: * names we are going to find in the directory. Must have a
453: * trailing / if the user typed it.
454: * names from the directory - We open dir, and return prefix
1.7 millert 455: * concatenated with names.
456: */
457:
458: /* first we get a directory name we can look up */
459: /*
460: * Names ending in . are potentially odd, because adjustname will
1.71 kjell 461: * treat foo/bar/.. as a foo/, whereas we are
1.7 millert 462: * interested in names starting with ..
463: */
464: len = strlen(buf);
1.71 kjell 465: if (len && buf[len - 1] == '.') {
1.7 millert 466: buf[len - 1] = 'x';
1.74 jason 467: dir = adjustname(buf, TRUE);
1.7 millert 468: buf[len - 1] = '.';
469: } else
1.74 jason 470: dir = adjustname(buf, TRUE);
1.33 vincent 471: if (dir == NULL)
1.36 vincent 472: return (NULL);
1.7 millert 473: /*
474: * If the user typed a trailing / or the empty string
475: * he wants us to use his file spec as a directory name.
476: */
1.71 kjell 477: if (len && buf[len - 1] != '/') {
1.7 millert 478: file = strrchr(dir, '/');
479: if (file) {
1.69 kjell 480: *file = '\0';
481: if (*dir == '\0')
1.7 millert 482: dir = "/";
1.49 db 483: } else
1.7 millert 484: return (NULL);
1.1 deraadt 485: }
1.7 millert 486: /* Now we get the prefix of the name the user typed. */
1.67 kjell 487: if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
488: return (NULL);
1.7 millert 489: cp = strrchr(prefixx, '/');
490: if (cp == NULL)
1.67 kjell 491: prefixx[0] = '\0';
1.7 millert 492: else
1.67 kjell 493: cp[1] = '\0';
1.7 millert 494:
495: preflen = strlen(prefixx);
1.49 db 496: /* cp is the tail of buf that really needs to be compared. */
1.7 millert 497: cp = buf + preflen;
498: len = strlen(cp);
499:
500: /*
501: * Now make sure that file names will fit in the buffers allocated.
502: * SV files are fairly short. For BSD, something more general would
503: * be required.
504: */
1.71 kjell 505: if (preflen > NFILEN - MAXNAMLEN)
1.7 millert 506: return (NULL);
507:
508: /* loop over the specified directory, making up the list of files */
509:
510: /*
511: * Note that it is worth our time to filter out names that don't
512: * match, even though our caller is going to do so again, and to
513: * avoid doing the stat if completion is being done, because stat'ing
514: * every file in the directory is relatively expensive.
515: */
1.1 deraadt 516:
1.11 art 517: dirp = opendir(dir);
518: if (dirp == NULL)
1.7 millert 519: return (NULL);
520: last = NULL;
1.11 art 521:
522: while ((dent = readdir(dirp)) != NULL) {
1.18 art 523: int isdir;
1.83 kjell 524: if (strncmp(cp, dent->d_name, len) != 0)
1.11 art 525: continue;
1.18 art 526: isdir = 0;
527: if (dent->d_type == DT_DIR) {
528: isdir = 1;
529: } else if (dent->d_type == DT_LNK ||
530: dent->d_type == DT_UNKNOWN) {
531: struct stat statbuf;
532:
1.101 guenther 533: if (fstatat(dirfd(dirp), dent->d_name, &statbuf, 0) < 0)
1.18 art 534: continue;
1.78 otto 535: if (S_ISDIR(statbuf.st_mode))
1.18 art 536: isdir = 1;
537: }
538:
1.68 kjell 539: if ((current = malloc(sizeof(struct list))) == NULL) {
540: free_file_list(last);
1.86 lum 541: closedir(dirp);
1.68 kjell 542: return (NULL);
543: }
544: ret = snprintf(fl_name, sizeof(fl_name),
1.61 kjell 545: "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
1.68 kjell 546: if (ret < 0 || ret >= sizeof(fl_name)) {
1.11 art 547: free(current);
1.7 millert 548: continue;
549: }
1.68 kjell 550: current->l_next = last;
551: current->l_name = strdup(fl_name);
552: last = current;
1.1 deraadt 553: }
1.11 art 554: closedir(dirp);
1.1 deraadt 555:
1.7 millert 556: return (last);
1.54 kjell 557: }
558:
559: /*
560: * Test if a supplied filename refers to a directory
561: * Returns ABORT on error, TRUE if directory. FALSE otherwise
562: */
563: int
564: fisdir(const char *fname)
565: {
566: struct stat statbuf;
567:
568: if (stat(fname, &statbuf) != 0)
569: return (ABORT);
570:
571: if (S_ISDIR(statbuf.st_mode))
572: return (TRUE);
573:
574: return (FALSE);
1.82 kjell 575: }
576:
577: /*
578: * Check the mtime of the supplied filename.
579: * Return TRUE if last mtime matches, FALSE if not,
580: * If the stat fails, return TRUE and try the save anyway
581: */
582: int
583: fchecktime(struct buffer *bp)
584: {
585: struct stat sb;
586:
587: if (stat(bp->b_fname, &sb) == -1)
588: return (TRUE);
589:
1.112 ! guenther 590: if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtim.tv_sec ||
! 591: bp->b_fi.fi_mtime.tv_nsec != sb.st_mtim.tv_nsec)
1.82 kjell 592: return (FALSE);
593:
594: return (TRUE);
1.93 jasper 595:
1.91 lum 596: }
597:
598: /*
599: * Location of backup file. This function creates the correct path.
600: */
601: static char *
602: bkuplocation(const char *fn)
603: {
604: struct stat sb;
605: char *ret;
606:
607: if (bkupdir != NULL && (stat(bkupdir, &sb) == 0) &&
608: S_ISDIR(sb.st_mode) && !bkupleavetmp(fn)) {
609: char fname[NFILEN];
610: const char *c;
611: int i = 0, len;
612:
613: c = fn;
614: len = strlen(bkupdir);
615:
616: while (*c != '\0') {
617: /* Make sure we don't go over combined:
618: * strlen(bkupdir + '/' + fname + '\0')
619: */
620: if (i >= NFILEN - len - 1)
621: return (NULL);
622: if (*c == '/') {
623: fname[i] = '!';
624: } else if (*c == '!') {
625: if (i >= NFILEN - len - 2)
626: return (NULL);
627: fname[i++] = '!';
628: fname[i] = '!';
629: } else
630: fname[i] = *c;
631: i++;
632: c++;
633: }
634: fname[i] = '\0';
635: if (asprintf(&ret, "%s/%s", bkupdir, fname) == -1)
636: return (NULL);
637:
638: } else if ((ret = strndup(fn, NFILEN)) == NULL)
639: return (NULL);
640:
641: return (ret);
642: }
643:
644: int
645: backuptohomedir(int f, int n)
646: {
1.93 jasper 647: const char *c = _PATH_MG_DIR;
1.91 lum 648: char *p;
649:
650: if (bkupdir == NULL) {
651: p = adjustname(c, TRUE);
652: bkupdir = strndup(p, NFILEN);
653: if (bkupdir == NULL)
654: return(FALSE);
655:
656: if (mkdir(bkupdir, 0700) == -1 && errno != EEXIST) {
657: free(bkupdir);
658: bkupdir = NULL;
659: }
660: } else {
661: free(bkupdir);
662: bkupdir = NULL;
663: }
664:
665: return (TRUE);
666: }
667:
668: /*
669: * For applications that use mg as the editor and have a desire to keep
1.102 tedu 670: * '~' files in /tmp, toggle the location: /tmp | ~/.mg.d
1.91 lum 671: */
672: int
673: toggleleavetmp(int f, int n)
674: {
675: leavetmp = !leavetmp;
676:
677: return (TRUE);
678: }
679:
680: /*
681: * Returns TRUE if fn is located in the temp directory and we want to save
682: * those backups there.
683: */
684: int
685: bkupleavetmp(const char *fn)
686: {
687: if (!leavetmp)
688: return(FALSE);
689:
1.103 tedu 690: if (strncmp(fn, "/tmp", 4) == 0)
1.91 lum 691: return (TRUE);
692:
693: return (FALSE);
1.92 lum 694: }
695:
1.93 jasper 696: /*
1.92 lum 697: * Expand file names beginning with '~' if appropriate:
698: * 1, if ./~fn exists, continue without expanding tilde.
699: * 2, else, if username 'fn' exists, expand tilde with home directory path.
700: * 3, otherwise, continue and create new buffer called ~fn.
701: */
702: char *
703: expandtilde(const char *fn)
704: {
705: struct passwd *pw;
706: struct stat statbuf;
707: const char *cp;
1.94 lum 708: char user[LOGIN_NAME_MAX], path[NFILEN];
1.105 florian 709: char *ret;
1.92 lum 710: size_t ulen, plen;
711:
712: path[0] = '\0';
713:
714: if (fn[0] != '~' || stat(fn, &statbuf) == 0) {
715: if ((ret = strndup(fn, NFILEN)) == NULL)
716: return (NULL);
717: return(ret);
718: }
719: cp = strchr(fn, '/');
720: if (cp == NULL)
721: cp = fn + strlen(fn); /* point to the NUL byte */
722: ulen = cp - &fn[1];
723: if (ulen >= sizeof(user)) {
724: if ((ret = strndup(fn, NFILEN)) == NULL)
725: return (NULL);
726: return(ret);
727: }
1.105 florian 728: if (ulen == 0) /* ~/ or ~ */
729: pw = getpwuid(geteuid());
730: else { /* ~user/ or ~user */
1.92 lum 731: memcpy(user, &fn[1], ulen);
732: user[ulen] = '\0';
1.105 florian 733: pw = getpwnam(user);
1.92 lum 734: }
735: if (pw != NULL) {
736: plen = strlcpy(path, pw->pw_dir, sizeof(path));
737: if (plen == 0 || path[plen - 1] != '/') {
738: if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
1.97 lum 739: dobeep();
1.92 lum 740: ewprintf("Path too long");
741: return (NULL);
742: }
743: }
744: fn = cp;
745: if (*fn == '/')
746: fn++;
747: }
748: if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
1.97 lum 749: dobeep();
1.92 lum 750: ewprintf("Path too long");
751: return (NULL);
752: }
753: if ((ret = strndup(path, NFILEN)) == NULL)
754: return (NULL);
755:
756: return (ret);
1.1 deraadt 757: }
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