Annotation of src/usr.bin/mg/fileio.c, Revision 1.95
1.95 ! jasper 1: /* $OpenBSD: fileio.c,v 1.94 2012/07/10 06:28:12 lum 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: */
1.49 db 8: #include "def.h"
1.56 deraadt 9:
1.82 kjell 10: #include <sys/types.h>
1.72 kjell 11: #include <sys/stat.h>
1.56 deraadt 12: #include <sys/time.h>
1.76 jason 13: #include <sys/resource.h>
1.53 kjell 14: #include <sys/wait.h>
1.72 kjell 15:
16: #include <fcntl.h>
1.33 vincent 17: #include <limits.h>
1.76 jason 18: #include <dirent.h>
1.72 kjell 19: #include <pwd.h>
1.21 vincent 20: #include <string.h>
1.9 millert 21: #include <unistd.h>
1.1 deraadt 22:
1.72 kjell 23: #include "kbd.h"
1.93 jasper 24: #include "pathnames.h"
1.72 kjell 25:
1.91 lum 26: static char *bkuplocation(const char *);
27: static int bkupleavetmp(const char *);
28:
29: static char *bkupdir;
1.93 jasper 30: static int leavetmp = 0; /* 1 = leave any '~' files in tmp dir */
1.91 lum 31:
1.1 deraadt 32: /*
33: * Open a file for reading.
34: */
1.7 millert 35: int
1.89 lum 36: ffropen(FILE ** ffp, const char *fn, struct buffer *bp)
1.7 millert 37: {
1.89 lum 38: if ((*ffp = fopen(fn, "r")) == NULL) {
1.46 jfb 39: if (errno == ENOENT)
40: return (FIOFNF);
41: return (FIOERR);
42: }
1.53 kjell 43:
44: /* If 'fn' is a directory open it with dired. */
1.54 kjell 45: if (fisdir(fn) == TRUE)
1.53 kjell 46: return (FIODIR);
47:
1.89 lum 48: ffstat(*ffp, bp);
1.93 jasper 49:
1.82 kjell 50: return (FIOSUC);
51: }
52:
53: /*
54: * Update stat/dirty info
55: */
56: void
1.89 lum 57: ffstat(FILE *ffp, struct buffer *bp)
1.82 kjell 58: {
59: struct stat sb;
60:
61: if (bp && fstat(fileno(ffp), &sb) == 0) {
1.7 millert 62: /* set highorder bit to make sure this isn't all zero */
1.82 kjell 63: bp->b_fi.fi_mode = sb.st_mode | 0x8000;
64: bp->b_fi.fi_uid = sb.st_uid;
65: bp->b_fi.fi_gid = sb.st_gid;
66: bp->b_fi.fi_mtime = sb.st_mtimespec;
67: /* Clear the ignore flag */
68: bp->b_flag &= ~(BFIGNDIRTY | BFDIRTY);
1.1 deraadt 69: }
1.82 kjell 70: }
1.53 kjell 71:
1.82 kjell 72: /*
73: * Update the status/dirty info. If there is an error,
74: * there's not a lot we can do.
75: */
76: int
77: fupdstat(struct buffer *bp)
78: {
1.89 lum 79: FILE *ffp;
80:
1.82 kjell 81: if ((ffp = fopen(bp->b_fname, "r")) == NULL) {
82: if (errno == ENOENT)
83: return (FIOFNF);
84: return (FIOERR);
85: }
1.89 lum 86: ffstat(ffp, bp);
87: (void)ffclose(ffp, bp);
1.1 deraadt 88: return (FIOSUC);
89: }
90:
91: /*
92: * Open a file for writing.
93: */
1.7 millert 94: int
1.89 lum 95: ffwopen(FILE ** ffp, const char *fn, struct buffer *bp)
1.7 millert 96: {
1.49 db 97: int fd;
1.66 kjell 98: mode_t fmode = DEFFILEMODE;
1.7 millert 99:
1.24 deraadt 100: if (bp && bp->b_fi.fi_mode)
1.66 kjell 101: fmode = bp->b_fi.fi_mode & 07777;
1.24 deraadt 102:
1.66 kjell 103: fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, fmode);
1.24 deraadt 104: if (fd == -1) {
105: ffp = NULL;
1.21 vincent 106: ewprintf("Cannot open file for writing : %s", strerror(errno));
1.1 deraadt 107: return (FIOERR);
1.34 deraadt 108: }
1.24 deraadt 109:
1.89 lum 110: if ((*ffp = fdopen(fd, "w")) == NULL) {
1.24 deraadt 111: ewprintf("Cannot open file for writing : %s", strerror(errno));
112: close(fd);
1.34 deraadt 113: return (FIOERR);
1.1 deraadt 114: }
1.7 millert 115:
116: /*
117: * If we have file information, use it. We don't bother to check for
118: * errors, because there's no a lot we can do about it. Certainly
1.24 deraadt 119: * trying to change ownership will fail if we aren't root. That's
1.7 millert 120: * probably OK. If we don't have info, no need to get it, since any
121: * future writes will do the same thing.
1.1 deraadt 122: */
123: if (bp && bp->b_fi.fi_mode) {
1.28 deraadt 124: fchmod(fd, bp->b_fi.fi_mode & 07777);
125: fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
1.1 deraadt 126: }
127: return (FIOSUC);
128: }
129:
130: /*
131: * Close a file.
132: */
1.7 millert 133: /* ARGSUSED */
134: int
1.89 lum 135: ffclose(FILE *ffp, struct buffer *bp)
1.7 millert 136: {
1.85 lum 137: if (fclose(ffp) == 0)
138: return (FIOSUC);
1.93 jasper 139: return (FIOERR);
1.1 deraadt 140: }
141:
142: /*
1.41 vincent 143: * Write a buffer to the already opened file. bp points to the
1.1 deraadt 144: * buffer. Return the status.
145: */
1.7 millert 146: int
1.89 lum 147: ffputbuf(FILE *ffp, struct buffer *bp)
1.1 deraadt 148: {
1.62 deraadt 149: struct line *lp, *lpend;
1.7 millert 150:
1.77 kjell 151: lpend = bp->b_headp;
1.41 vincent 152: for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
153: if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
154: ewprintf("Write I/O error");
1.49 db 155: return (FIOERR);
1.7 millert 156: }
1.41 vincent 157: if (lforw(lp) != lpend) /* no implied \n on last line */
158: putc('\n', ffp);
1.48 deraadt 159: }
1.42 vincent 160: /*
161: * XXX should be variable controlled (once we have variables)
162: */
163: if (llength(lback(lpend)) != 0) {
164: if (eyorn("No newline at end of file, add one") == TRUE) {
165: lnewline_at(lback(lpend), llength(lback(lpend)));
166: putc('\n', ffp);
167: }
168: }
1.7 millert 169: return (FIOSUC);
1.1 deraadt 170: }
171:
172: /*
173: * Read a line from a file, and store the bytes
174: * in the supplied buffer. Stop on end of file or end of
175: * line. When FIOEOF is returned, there is a valid line
176: * of data without the normally implied \n.
1.80 kjell 177: * If the line length exceeds nbuf, FIOLONG is returned.
1.1 deraadt 178: */
1.7 millert 179: int
1.89 lum 180: ffgetline(FILE *ffp, char *buf, int nbuf, int *nbytes)
1.1 deraadt 181: {
1.16 mickey 182: int c, i;
1.1 deraadt 183:
184: i = 0;
1.7 millert 185: while ((c = getc(ffp)) != EOF && c != '\n') {
1.1 deraadt 186: buf[i++] = c;
1.7 millert 187: if (i >= nbuf)
1.49 db 188: return (FIOLONG);
1.1 deraadt 189: }
1.7 millert 190: if (c == EOF && ferror(ffp) != FALSE) {
1.1 deraadt 191: ewprintf("File read error");
1.49 db 192: return (FIOERR);
1.1 deraadt 193: }
194: *nbytes = i;
1.49 db 195: return (c == EOF ? FIOEOF : FIOSUC);
1.1 deraadt 196: }
197:
198: /*
1.9 millert 199: * Make a backup copy of "fname". On Unix the backup has the same
200: * name as the original file, with a "~" on the end; this seems to
201: * be newest of the new-speak. The error handling is all in "file.c".
202: * We do a copy instead of a rename since otherwise another process
203: * with an open fd will get the backup, not the new file. This is
204: * a problem when using mg with things like crontab and vipw.
1.1 deraadt 205: */
1.7 millert 206: int
1.25 vincent 207: fbackupfile(const char *fn)
1.7 millert 208: {
1.49 db 209: struct stat sb;
210: int from, to, serrno;
211: ssize_t nread;
212: char buf[BUFSIZ];
1.91 lum 213: char *nname, *tname, *bkpth;
1.1 deraadt 214:
1.35 vincent 215: if (stat(fn, &sb) == -1) {
216: ewprintf("Can't stat %s : %s", fn, strerror(errno));
217: return (FALSE);
218: }
219:
1.91 lum 220: if ((bkpth = bkuplocation(fn)) == NULL)
221: return (FALSE);
222:
223: if (asprintf(&nname, "%s~", bkpth) == -1) {
1.90 lum 224: ewprintf("Can't allocate backup file name : %s", strerror(errno));
1.91 lum 225: free(bkpth);
1.44 millert 226: return (ABORT);
227: }
1.91 lum 228: if (asprintf(&tname, "%s.XXXXXXXXXX", bkpth) == -1) {
1.44 millert 229: ewprintf("Can't allocate temp file name : %s", strerror(errno));
1.91 lum 230: free(bkpth);
1.44 millert 231: free(nname);
1.1 deraadt 232: return (ABORT);
1.9 millert 233: }
1.91 lum 234: free(bkpth);
1.9 millert 235:
1.21 vincent 236: if ((from = open(fn, O_RDONLY)) == -1) {
237: free(nname);
1.44 millert 238: free(tname);
1.1 deraadt 239: return (FALSE);
1.21 vincent 240: }
1.44 millert 241: to = mkstemp(tname);
1.9 millert 242: if (to == -1) {
243: serrno = errno;
244: close(from);
1.21 vincent 245: free(nname);
1.44 millert 246: free(tname);
1.9 millert 247: errno = serrno;
248: return (FALSE);
249: }
250: while ((nread = read(from, buf, sizeof(buf))) > 0) {
1.70 deraadt 251: if (write(to, buf, (size_t)nread) != nread) {
1.40 vincent 252: nread = -1;
253: break;
1.9 millert 254: }
1.1 deraadt 255: }
1.9 millert 256: serrno = errno;
1.44 millert 257: (void) fchmod(to, (sb.st_mode & 0777));
1.9 millert 258: close(from);
259: close(to);
1.21 vincent 260: if (nread == -1) {
1.44 millert 261: if (unlink(tname) == -1)
1.21 vincent 262: ewprintf("Can't unlink temp : %s", strerror(errno));
1.44 millert 263: } else {
264: if (rename(tname, nname) == -1) {
265: ewprintf("Can't rename temp : %s", strerror(errno));
266: (void) unlink(tname);
1.45 henning 267: nread = -1;
1.44 millert 268: }
1.21 vincent 269: }
1.1 deraadt 270: free(nname);
1.44 millert 271: free(tname);
1.9 millert 272: errno = serrno;
1.22 deraadt 273:
1.9 millert 274: return (nread == -1 ? FALSE : TRUE);
1.1 deraadt 275: }
276:
277: /*
1.73 kjell 278: * Convert "fn" to a canonicalized absolute filename, replacing
279: * a leading ~/ with the user's home dir, following symlinks, and
1.81 martynas 280: * and remove all occurrences of /./ and /../
1.1 deraadt 281: */
1.7 millert 282: char *
1.74 jason 283: adjustname(const char *fn, int slashslash)
1.1 deraadt 284: {
1.49 db 285: static char fnb[MAXPATHLEN];
1.74 jason 286: const char *cp, *ep = NULL;
1.92 lum 287: char *path;
1.74 jason 288:
1.75 kjell 289: if (slashslash == TRUE) {
1.74 jason 290: cp = fn + strlen(fn) - 1;
291: for (; cp >= fn; cp--) {
292: if (ep && (*cp == '/')) {
293: fn = ep;
294: break;
295: }
296: if (*cp == '/' || *cp == '~')
297: ep = cp;
298: else
299: ep = NULL;
300: }
301: }
1.92 lum 302: if ((path = expandtilde(fn)) == NULL)
1.57 kjell 303: return (NULL);
1.33 vincent 304:
1.47 henning 305: if (realpath(path, fnb) == NULL)
1.57 kjell 306: (void)strlcpy(fnb, path, sizeof(fnb));
1.47 henning 307:
1.92 lum 308: free(path);
1.47 henning 309: return (fnb);
1.1 deraadt 310: }
311:
312: /*
313: * Find a startup file for the user and return its name. As a service
314: * to other pieces of code that may want to find a startup file (like
315: * the terminal driver in particular), accepts a suffix to be appended
316: * to the startup file name.
317: */
318: char *
1.27 millert 319: startupfile(char *suffix)
1.1 deraadt 320: {
1.49 db 321: static char file[NFILEN];
1.16 mickey 322: char *home;
1.61 kjell 323: int ret;
1.12 art 324:
325: if ((home = getenv("HOME")) == NULL || *home == '\0')
326: goto nohome;
1.1 deraadt 327:
1.12 art 328: if (suffix == NULL) {
1.93 jasper 329: ret = snprintf(file, sizeof(file), _PATH_MG_STARTUP, home);
1.61 kjell 330: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 331: return (NULL);
1.12 art 332: } else {
1.93 jasper 333: ret = snprintf(file, sizeof(file), _PATH_MG_TERM, home, suffix);
1.61 kjell 334: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 335: return (NULL);
1.1 deraadt 336: }
1.12 art 337:
338: if (access(file, R_OK) == 0)
1.32 vincent 339: return (file);
1.12 art 340: nohome:
341: #ifdef STARTUPFILE
1.27 millert 342: if (suffix == NULL) {
1.61 kjell 343: ret = snprintf(file, sizeof(file), "%s", STARTUPFILE);
344: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 345: return (NULL);
1.12 art 346: } else {
1.61 kjell 347: ret = snprintf(file, sizeof(file), "%s%s", STARTUPFILE,
348: suffix);
349: if (ret < 0 || ret >= sizeof(file))
1.32 vincent 350: return (NULL);
1.12 art 351: }
352:
353: if (access(file, R_OK) == 0)
1.32 vincent 354: return (file);
1.61 kjell 355: #endif /* STARTUPFILE */
1.32 vincent 356: return (NULL);
1.1 deraadt 357: }
358:
1.7 millert 359: int
1.27 millert 360: copy(char *frname, char *toname)
1.1 deraadt 361: {
1.70 deraadt 362: int ifd, ofd;
1.49 db 363: char buf[BUFSIZ];
1.66 kjell 364: mode_t fmode = DEFFILEMODE; /* XXX?? */
1.49 db 365: struct stat orig;
1.70 deraadt 366: ssize_t sr;
1.30 vincent 367:
368: if ((ifd = open(frname, O_RDONLY)) == -1)
369: return (FALSE);
370: if (fstat(ifd, &orig) == -1) {
371: ewprintf("fstat: %s", strerror(errno));
372: close(ifd);
373: return (FALSE);
374: }
375:
1.66 kjell 376: if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, fmode)) == -1) {
1.30 vincent 377: close(ifd);
378: return (FALSE);
379: }
1.70 deraadt 380: while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
381: if (write(ofd, buf, (size_t)sr) != sr) {
1.30 vincent 382: ewprintf("write error : %s", strerror(errno));
383: break;
384: }
385: }
386: if (fchmod(ofd, orig.st_mode) == -1)
387: ewprintf("Cannot set original mode : %s", strerror(errno));
1.1 deraadt 388:
1.70 deraadt 389: if (sr == -1) {
1.30 vincent 390: ewprintf("Read error : %s", strerror(errno));
391: close(ifd);
392: close(ofd);
393: return (FALSE);
1.7 millert 394: }
1.30 vincent 395: /*
1.32 vincent 396: * It is "normal" for this to fail since we can't guarantee that
1.49 db 397: * we will be running as root.
1.30 vincent 398: */
399: if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
400: ewprintf("Cannot set owner : %s", strerror(errno));
401:
402: (void) close(ifd);
403: (void) close(ofd);
404:
405: return (TRUE);
1.7 millert 406: }
1.1 deraadt 407:
1.7 millert 408: /*
1.1 deraadt 409: * return list of file names that match the name in buf.
410: */
1.62 deraadt 411: struct list *
1.25 vincent 412: make_file_list(char *buf)
1.7 millert 413: {
1.16 mickey 414: char *dir, *file, *cp;
1.71 kjell 415: size_t len, preflen;
416: int ret;
1.16 mickey 417: DIR *dirp;
418: struct dirent *dent;
1.68 kjell 419: struct list *last, *current;
420: char fl_name[NFILEN + 2];
1.49 db 421: char prefixx[NFILEN + 1];
1.7 millert 422:
423: /*
1.79 deraadt 424: * We need three different strings:
1.72 kjell 425:
426: * dir - the name of the directory containing what the user typed.
427: * Must be a real unix file name, e.g. no ~user, etc..
428: * Must not end in /.
429: * prefix - the portion of what the user typed that is before the
430: * names we are going to find in the directory. Must have a
431: * trailing / if the user typed it.
432: * names from the directory - We open dir, and return prefix
1.7 millert 433: * concatenated with names.
434: */
435:
436: /* first we get a directory name we can look up */
437: /*
438: * Names ending in . are potentially odd, because adjustname will
1.71 kjell 439: * treat foo/bar/.. as a foo/, whereas we are
1.7 millert 440: * interested in names starting with ..
441: */
442: len = strlen(buf);
1.71 kjell 443: if (len && buf[len - 1] == '.') {
1.7 millert 444: buf[len - 1] = 'x';
1.74 jason 445: dir = adjustname(buf, TRUE);
1.7 millert 446: buf[len - 1] = '.';
447: } else
1.74 jason 448: dir = adjustname(buf, TRUE);
1.33 vincent 449: if (dir == NULL)
1.36 vincent 450: return (NULL);
1.7 millert 451: /*
452: * If the user typed a trailing / or the empty string
453: * he wants us to use his file spec as a directory name.
454: */
1.71 kjell 455: if (len && buf[len - 1] != '/') {
1.7 millert 456: file = strrchr(dir, '/');
457: if (file) {
1.69 kjell 458: *file = '\0';
459: if (*dir == '\0')
1.7 millert 460: dir = "/";
1.49 db 461: } else
1.7 millert 462: return (NULL);
1.1 deraadt 463: }
1.7 millert 464: /* Now we get the prefix of the name the user typed. */
1.67 kjell 465: if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
466: return (NULL);
1.7 millert 467: cp = strrchr(prefixx, '/');
468: if (cp == NULL)
1.67 kjell 469: prefixx[0] = '\0';
1.7 millert 470: else
1.67 kjell 471: cp[1] = '\0';
1.7 millert 472:
473: preflen = strlen(prefixx);
1.49 db 474: /* cp is the tail of buf that really needs to be compared. */
1.7 millert 475: cp = buf + preflen;
476: len = strlen(cp);
477:
478: /*
479: * Now make sure that file names will fit in the buffers allocated.
480: * SV files are fairly short. For BSD, something more general would
481: * be required.
482: */
1.71 kjell 483: if (preflen > NFILEN - MAXNAMLEN)
1.7 millert 484: return (NULL);
485:
486: /* loop over the specified directory, making up the list of files */
487:
488: /*
489: * Note that it is worth our time to filter out names that don't
490: * match, even though our caller is going to do so again, and to
491: * avoid doing the stat if completion is being done, because stat'ing
492: * every file in the directory is relatively expensive.
493: */
1.1 deraadt 494:
1.11 art 495: dirp = opendir(dir);
496: if (dirp == NULL)
1.7 millert 497: return (NULL);
498: last = NULL;
1.11 art 499:
500: while ((dent = readdir(dirp)) != NULL) {
1.18 art 501: int isdir;
1.83 kjell 502: if (strncmp(cp, dent->d_name, len) != 0)
1.11 art 503: continue;
1.18 art 504: isdir = 0;
505: if (dent->d_type == DT_DIR) {
506: isdir = 1;
507: } else if (dent->d_type == DT_LNK ||
508: dent->d_type == DT_UNKNOWN) {
509: struct stat statbuf;
510: char statname[NFILEN + 2];
511:
512: statbuf.st_mode = 0;
1.61 kjell 513: ret = snprintf(statname, sizeof(statname), "%s/%s",
514: dir, dent->d_name);
515: if (ret < 0 || ret > sizeof(statname) - 1)
1.18 art 516: continue;
517: if (stat(statname, &statbuf) < 0)
518: continue;
1.78 otto 519: if (S_ISDIR(statbuf.st_mode))
1.18 art 520: isdir = 1;
521: }
522:
1.68 kjell 523: if ((current = malloc(sizeof(struct list))) == NULL) {
524: free_file_list(last);
1.86 lum 525: closedir(dirp);
1.68 kjell 526: return (NULL);
527: }
528: ret = snprintf(fl_name, sizeof(fl_name),
1.61 kjell 529: "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
1.68 kjell 530: if (ret < 0 || ret >= sizeof(fl_name)) {
1.11 art 531: free(current);
1.7 millert 532: continue;
533: }
1.68 kjell 534: current->l_next = last;
535: current->l_name = strdup(fl_name);
536: last = current;
1.1 deraadt 537: }
1.11 art 538: closedir(dirp);
1.1 deraadt 539:
1.7 millert 540: return (last);
1.54 kjell 541: }
542:
543: /*
544: * Test if a supplied filename refers to a directory
545: * Returns ABORT on error, TRUE if directory. FALSE otherwise
546: */
547: int
548: fisdir(const char *fname)
549: {
550: struct stat statbuf;
551:
552: if (stat(fname, &statbuf) != 0)
553: return (ABORT);
554:
555: if (S_ISDIR(statbuf.st_mode))
556: return (TRUE);
557:
558: return (FALSE);
1.82 kjell 559: }
560:
561: /*
562: * Check the mtime of the supplied filename.
563: * Return TRUE if last mtime matches, FALSE if not,
564: * If the stat fails, return TRUE and try the save anyway
565: */
566: int
567: fchecktime(struct buffer *bp)
568: {
569: struct stat sb;
570:
571: if (stat(bp->b_fname, &sb) == -1)
572: return (TRUE);
573:
574: if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtimespec.tv_sec ||
575: bp->b_fi.fi_mtime.tv_nsec != sb.st_mtimespec.tv_nsec)
576: return (FALSE);
577:
578: return (TRUE);
1.93 jasper 579:
1.91 lum 580: }
581:
582: /*
583: * Location of backup file. This function creates the correct path.
584: */
585: static char *
586: bkuplocation(const char *fn)
587: {
588: struct stat sb;
589: char *ret;
590:
591: if (bkupdir != NULL && (stat(bkupdir, &sb) == 0) &&
592: S_ISDIR(sb.st_mode) && !bkupleavetmp(fn)) {
593: char fname[NFILEN];
594: const char *c;
595: int i = 0, len;
596:
597: c = fn;
598: len = strlen(bkupdir);
599:
600: while (*c != '\0') {
601: /* Make sure we don't go over combined:
602: * strlen(bkupdir + '/' + fname + '\0')
603: */
604: if (i >= NFILEN - len - 1)
605: return (NULL);
606: if (*c == '/') {
607: fname[i] = '!';
608: } else if (*c == '!') {
609: if (i >= NFILEN - len - 2)
610: return (NULL);
611: fname[i++] = '!';
612: fname[i] = '!';
613: } else
614: fname[i] = *c;
615: i++;
616: c++;
617: }
618: fname[i] = '\0';
619: if (asprintf(&ret, "%s/%s", bkupdir, fname) == -1)
620: return (NULL);
621:
622: } else if ((ret = strndup(fn, NFILEN)) == NULL)
623: return (NULL);
624:
625: return (ret);
626: }
627:
628: int
629: backuptohomedir(int f, int n)
630: {
1.93 jasper 631: const char *c = _PATH_MG_DIR;
1.91 lum 632: char *p;
633:
634: if (bkupdir == NULL) {
635: p = adjustname(c, TRUE);
636: bkupdir = strndup(p, NFILEN);
637: if (bkupdir == NULL)
638: return(FALSE);
639:
640: if (mkdir(bkupdir, 0700) == -1 && errno != EEXIST) {
641: free(bkupdir);
642: bkupdir = NULL;
643: }
644: } else {
645: free(bkupdir);
646: bkupdir = NULL;
647: }
648:
649: return (TRUE);
650: }
651:
652: /*
653: * For applications that use mg as the editor and have a desire to keep
654: * '~' files in the TMPDIR, toggle the location: /tmp | ~/.mg.d
655: */
656: int
657: toggleleavetmp(int f, int n)
658: {
659: leavetmp = !leavetmp;
660:
661: return (TRUE);
662: }
663:
664: /*
665: * Returns TRUE if fn is located in the temp directory and we want to save
666: * those backups there.
667: */
668: int
669: bkupleavetmp(const char *fn)
670: {
671: char *tmpdir, *tmp = NULL;
672:
673: if (!leavetmp)
674: return(FALSE);
675:
676: if((tmpdir = getenv("TMPDIR")) != NULL && *tmpdir != '\0') {
677: tmp = strstr(fn, tmpdir);
678: if (tmp == fn)
679: return (TRUE);
680:
681: return (FALSE);
682: }
683:
684: tmp = strstr(fn, "/tmp");
685: if (tmp == fn)
686: return (TRUE);
687:
688: return (FALSE);
1.92 lum 689: }
690:
1.93 jasper 691: /*
1.92 lum 692: * Expand file names beginning with '~' if appropriate:
693: * 1, if ./~fn exists, continue without expanding tilde.
694: * 2, else, if username 'fn' exists, expand tilde with home directory path.
695: * 3, otherwise, continue and create new buffer called ~fn.
696: */
697: char *
698: expandtilde(const char *fn)
699: {
700: struct passwd *pw;
701: struct stat statbuf;
702: const char *cp;
1.94 lum 703: char user[LOGIN_NAME_MAX], path[NFILEN];
704: char *un, *ret;
1.92 lum 705: size_t ulen, plen;
706:
707: path[0] = '\0';
708:
709: if (fn[0] != '~' || stat(fn, &statbuf) == 0) {
710: if ((ret = strndup(fn, NFILEN)) == NULL)
711: return (NULL);
712: return(ret);
713: }
714: cp = strchr(fn, '/');
715: if (cp == NULL)
716: cp = fn + strlen(fn); /* point to the NUL byte */
717: ulen = cp - &fn[1];
718: if (ulen >= sizeof(user)) {
719: if ((ret = strndup(fn, NFILEN)) == NULL)
720: return (NULL);
721: return(ret);
722: }
1.94 lum 723: if (ulen == 0) { /* ~/ or ~ */
724: if ((un = getlogin()) != NULL)
725: (void)strlcpy(user, un, sizeof(user));
726: else
727: user[0] = '\0';
728: } else { /* ~user/ or ~user */
1.92 lum 729: memcpy(user, &fn[1], ulen);
730: user[ulen] = '\0';
731: }
732: pw = getpwnam(user);
733: if (pw != NULL) {
734: plen = strlcpy(path, pw->pw_dir, sizeof(path));
735: if (plen == 0 || path[plen - 1] != '/') {
736: if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
737: ewprintf("Path too long");
738: return (NULL);
739: }
740: }
741: fn = cp;
742: if (*fn == '/')
743: fn++;
744: }
745: if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
746: ewprintf("Path too long");
747: return (NULL);
748: }
749: if ((ret = strndup(path, NFILEN)) == NULL)
750: return (NULL);
751:
752: return (ret);
1.1 deraadt 753: }
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