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