Annotation of src/usr.bin/mg/fileio.c, Revision 1.49
1.49 ! db 1: /* $OpenBSD: fileio.c,v 1.48 2005/03/10 16:58:57 deraadt Exp $ */
1.10 niklas 2:
1.1 deraadt 3: /*
1.7 millert 4: * POSIX fileio.c
1.1 deraadt 5: */
1.49 ! db 6: #include "def.h"
1.1 deraadt 7:
8: #include <sys/types.h>
1.33 vincent 9: #include <limits.h>
1.1 deraadt 10: #include <sys/stat.h>
11: #include <sys/dir.h>
1.21 vincent 12: #include <string.h>
1.9 millert 13: #include <fcntl.h>
14: #include <unistd.h>
1.37 vincent 15: #include <ctype.h>
1.1 deraadt 16:
1.49 ! db 17: static FILE *ffp;
! 18:
1.1 deraadt 19: /*
20: * Open a file for reading.
21: */
1.7 millert 22: int
1.25 vincent 23: ffropen(const char *fn, BUFFER *bp)
1.7 millert 24: {
1.16 mickey 25: struct stat statbuf;
1.7 millert 26:
1.46 jfb 27: if ((ffp = fopen(fn, "r")) == NULL) {
28: if (errno == ENOENT)
29: return (FIOFNF);
30: return (FIOERR);
31: }
1.1 deraadt 32: if (bp && fstat(fileno(ffp), &statbuf) == 0) {
1.7 millert 33: /* set highorder bit to make sure this isn't all zero */
1.1 deraadt 34: bp->b_fi.fi_mode = statbuf.st_mode | 0x8000;
35: bp->b_fi.fi_uid = statbuf.st_uid;
36: bp->b_fi.fi_gid = statbuf.st_gid;
37: }
38: return (FIOSUC);
39: }
40:
41: /*
42: * Open a file for writing.
43: */
1.7 millert 44: int
1.25 vincent 45: ffwopen(const char *fn, BUFFER *bp)
1.7 millert 46: {
1.49 ! db 47: int fd;
! 48: mode_t mode = DEFFILEMODE;
1.7 millert 49:
1.24 deraadt 50: if (bp && bp->b_fi.fi_mode)
51: mode = bp->b_fi.fi_mode & 07777;
52:
53: fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, mode);
54: if (fd == -1) {
55: ffp = NULL;
1.21 vincent 56: ewprintf("Cannot open file for writing : %s", strerror(errno));
1.1 deraadt 57: return (FIOERR);
1.34 deraadt 58: }
1.24 deraadt 59:
60: if ((ffp = fdopen(fd, "w")) == NULL) {
61: ewprintf("Cannot open file for writing : %s", strerror(errno));
62: close(fd);
1.34 deraadt 63: return (FIOERR);
1.1 deraadt 64: }
1.7 millert 65:
66: /*
67: * If we have file information, use it. We don't bother to check for
68: * errors, because there's no a lot we can do about it. Certainly
1.24 deraadt 69: * trying to change ownership will fail if we aren't root. That's
1.7 millert 70: * probably OK. If we don't have info, no need to get it, since any
71: * future writes will do the same thing.
1.1 deraadt 72: */
73: if (bp && bp->b_fi.fi_mode) {
1.28 deraadt 74: fchmod(fd, bp->b_fi.fi_mode & 07777);
75: fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
1.1 deraadt 76: }
77: return (FIOSUC);
78: }
79:
80: /*
81: * Close a file.
1.7 millert 82: * XXX - Should look at the status.
1.1 deraadt 83: */
1.7 millert 84: /* ARGSUSED */
85: int
1.25 vincent 86: ffclose(BUFFER *bp)
1.7 millert 87: {
1.13 art 88: (void) fclose(ffp);
1.1 deraadt 89: return (FIOSUC);
90: }
91:
92: /*
1.41 vincent 93: * Write a buffer to the already opened file. bp points to the
1.1 deraadt 94: * buffer. Return the status.
95: */
1.7 millert 96: int
1.25 vincent 97: ffputbuf(BUFFER *bp)
1.1 deraadt 98: {
1.41 vincent 99: LINE *lp, *lpend;
1.7 millert 100:
101: lpend = bp->b_linep;
1.41 vincent 102: for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
103: if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
104: ewprintf("Write I/O error");
1.49 ! db 105: return (FIOERR);
1.7 millert 106: }
1.41 vincent 107: if (lforw(lp) != lpend) /* no implied \n on last line */
108: putc('\n', ffp);
1.48 deraadt 109: }
1.42 vincent 110: /*
111: * XXX should be variable controlled (once we have variables)
112: */
113: if (llength(lback(lpend)) != 0) {
114: if (eyorn("No newline at end of file, add one") == TRUE) {
115: lnewline_at(lback(lpend), llength(lback(lpend)));
116: putc('\n', ffp);
117: }
118: }
1.7 millert 119: return (FIOSUC);
1.1 deraadt 120: }
121:
122: /*
123: * Read a line from a file, and store the bytes
124: * in the supplied buffer. Stop on end of file or end of
125: * line. When FIOEOF is returned, there is a valid line
126: * of data without the normally implied \n.
127: */
1.7 millert 128: int
1.25 vincent 129: ffgetline(char *buf, int nbuf, int *nbytes)
1.1 deraadt 130: {
1.16 mickey 131: int c, i;
1.1 deraadt 132:
133: i = 0;
1.7 millert 134: while ((c = getc(ffp)) != EOF && c != '\n') {
1.1 deraadt 135: buf[i++] = c;
1.7 millert 136: if (i >= nbuf)
1.49 ! db 137: return (FIOLONG);
1.1 deraadt 138: }
1.7 millert 139: if (c == EOF && ferror(ffp) != FALSE) {
1.1 deraadt 140: ewprintf("File read error");
1.49 ! db 141: return (FIOERR);
1.1 deraadt 142: }
143: *nbytes = i;
1.49 ! db 144: return (c == EOF ? FIOEOF : FIOSUC);
1.1 deraadt 145: }
146:
147: #ifndef NO_BACKUP
148: /*
1.9 millert 149: * Make a backup copy of "fname". On Unix the backup has the same
150: * name as the original file, with a "~" on the end; this seems to
151: * be newest of the new-speak. The error handling is all in "file.c".
152: * We do a copy instead of a rename since otherwise another process
153: * with an open fd will get the backup, not the new file. This is
154: * a problem when using mg with things like crontab and vipw.
1.1 deraadt 155: */
1.7 millert 156: int
1.25 vincent 157: fbackupfile(const char *fn)
1.7 millert 158: {
1.49 ! db 159: struct stat sb;
! 160: int from, to, serrno;
! 161: ssize_t nread;
! 162: char buf[BUFSIZ];
1.44 millert 163: char *nname, *tname;
1.1 deraadt 164:
1.35 vincent 165: if (stat(fn, &sb) == -1) {
166: ewprintf("Can't stat %s : %s", fn, strerror(errno));
167: return (FALSE);
168: }
169:
1.21 vincent 170: if (asprintf(&nname, "%s~", fn) == -1) {
1.44 millert 171: ewprintf("Can't allocate temp file name : %s", strerror(errno));
172: return (ABORT);
173: }
174:
175: if (asprintf(&tname, "%s.XXXXXXXXXX", fn) == -1) {
176: ewprintf("Can't allocate temp file name : %s", strerror(errno));
177: free(nname);
1.1 deraadt 178: return (ABORT);
1.9 millert 179: }
180:
1.21 vincent 181: if ((from = open(fn, O_RDONLY)) == -1) {
182: free(nname);
1.44 millert 183: free(tname);
1.1 deraadt 184: return (FALSE);
1.21 vincent 185: }
1.44 millert 186: to = mkstemp(tname);
1.9 millert 187: if (to == -1) {
188: serrno = errno;
189: close(from);
1.21 vincent 190: free(nname);
1.44 millert 191: free(tname);
1.9 millert 192: errno = serrno;
193: return (FALSE);
194: }
195: while ((nread = read(from, buf, sizeof(buf))) > 0) {
196: if (write(to, buf, nread) != nread) {
1.40 vincent 197: nread = -1;
198: break;
1.9 millert 199: }
1.1 deraadt 200: }
1.9 millert 201: serrno = errno;
1.44 millert 202: (void) fchmod(to, (sb.st_mode & 0777));
1.9 millert 203: close(from);
204: close(to);
1.21 vincent 205: if (nread == -1) {
1.44 millert 206: if (unlink(tname) == -1)
1.21 vincent 207: ewprintf("Can't unlink temp : %s", strerror(errno));
1.44 millert 208: } else {
209: if (rename(tname, nname) == -1) {
210: ewprintf("Can't rename temp : %s", strerror(errno));
211: (void) unlink(tname);
1.45 henning 212: nread = -1;
1.44 millert 213: }
1.21 vincent 214: }
1.1 deraadt 215: free(nname);
1.44 millert 216: free(tname);
1.9 millert 217: errno = serrno;
1.22 deraadt 218:
1.9 millert 219: return (nread == -1 ? FALSE : TRUE);
1.1 deraadt 220: }
221: #endif
222:
223: /*
224: * The string "fn" is a file name.
225: * Perform any required appending of directory name or case adjustments.
1.39 jmc 226: * If NO_DIR is not defined, the same file should be referred to even if the
1.1 deraadt 227: * working directory changes.
228: */
229: #ifdef SYMBLINK
230: #include <sys/types.h>
231: #include <sys/stat.h>
232: #ifndef MAXLINK
233: #define MAXLINK 8 /* maximum symbolic links to follow */
234: #endif
235: #endif
236: #include <pwd.h>
237: #ifndef NO_DIR
1.16 mickey 238: extern char *wdir;
1.1 deraadt 239: #endif
240:
1.7 millert 241: char *
1.25 vincent 242: adjustname(const char *fn)
1.1 deraadt 243: {
1.49 ! db 244: static char fnb[MAXPATHLEN];
! 245: const char *cp;
! 246: char user[LOGIN_NAME_MAX + 1], path[MAXPATHLEN];
! 247: int len;
1.33 vincent 248:
249: path[0] = '\0';
250: /* first handle tilde expansion */
251: if (fn[0] == '~') {
252: struct passwd *pw;
253:
254: cp = strchr(fn, '/');
255: if (cp == NULL)
256: cp = fn + strlen(fn); /* point to the NUL byte */
1.1 deraadt 257:
1.33 vincent 258: if ((cp - &fn[1]) > LOGIN_NAME_MAX) {
259: ewprintf("login name too long");
260: return (NULL);
261: }
262: if (cp == &fn[1]) /* ~/ */
1.49 ! db 263: strlcpy(user, getlogin(), sizeof(user));
1.33 vincent 264: else
265: strlcpy(user, &fn[1], cp - &fn[1] + 1);
266: pw = getpwnam(user);
267: if (pw == NULL) {
268: ewprintf("unknown user %s", user);
269: return (NULL);
270: }
1.49 ! db 271: strlcpy(path, pw->pw_dir, sizeof(path) - 1);
1.33 vincent 272: len = strlen(path);
273: if (path[len] != '/') {
274: path[len] = '/';
275: path[len + 1] = '\0';
1.1 deraadt 276: }
1.33 vincent 277: fn = cp;
278: if (*fn == '/')
1.7 millert 279: fn++;
280: }
1.49 ! db 281: strlcat(path, fn, sizeof(path));
1.33 vincent 282:
1.47 henning 283: if (realpath(path, fnb) == NULL)
284: strlcpy(fnb, path, sizeof(fnb));
285:
286: return (fnb);
1.1 deraadt 287: }
288:
289: #ifndef NO_STARTUP
290: /*
291: * Find a startup file for the user and return its name. As a service
292: * to other pieces of code that may want to find a startup file (like
293: * the terminal driver in particular), accepts a suffix to be appended
294: * to the startup file name.
295: */
296: char *
1.27 millert 297: startupfile(char *suffix)
1.1 deraadt 298: {
1.49 ! db 299: static char file[NFILEN];
1.16 mickey 300: char *home;
1.12 art 301:
302: if ((home = getenv("HOME")) == NULL || *home == '\0')
303: goto nohome;
1.1 deraadt 304:
1.12 art 305: if (suffix == NULL) {
306: if (snprintf(file, sizeof(file), "%s/.mg", home)
1.32 vincent 307: >= sizeof(file))
308: return (NULL);
1.12 art 309: } else {
310: if (snprintf(file, sizeof(file), "%s/.mg-%s", home, suffix)
1.32 vincent 311: >= sizeof(file))
312: return (NULL);
1.1 deraadt 313: }
1.12 art 314:
315: if (access(file, R_OK) == 0)
1.32 vincent 316: return (file);
1.12 art 317: nohome:
318: #ifdef STARTUPFILE
1.27 millert 319: if (suffix == NULL) {
1.12 art 320: if (snprintf(file, sizeof(file), "%s", STARTUPFILE)
1.32 vincent 321: >= sizeof(file))
322: return (NULL);
1.12 art 323: } else {
324: if (snprintf(file, sizeof(file), "%s%s", STARTUPFILE, suffix)
1.32 vincent 325: >= sizeof(file))
326: return (NULL);
1.12 art 327: }
328:
329: if (access(file, R_OK) == 0)
1.32 vincent 330: return (file);
1.1 deraadt 331: #endif
1.32 vincent 332: return (NULL);
1.1 deraadt 333: }
334: #endif
335:
336: #ifndef NO_DIRED
1.4 millert 337: #include <sys/wait.h>
1.1 deraadt 338: #include "kbd.h"
339:
1.7 millert 340: int
1.27 millert 341: copy(char *frname, char *toname)
1.1 deraadt 342: {
1.49 ! db 343: int ifd, ofd, n;
! 344: char buf[BUFSIZ];
! 345: mode_t mode = DEFFILEMODE; /* XXX?? */
! 346: struct stat orig;
1.30 vincent 347:
348: if ((ifd = open(frname, O_RDONLY)) == -1)
349: return (FALSE);
350: if (fstat(ifd, &orig) == -1) {
351: ewprintf("fstat: %s", strerror(errno));
352: close(ifd);
353: return (FALSE);
354: }
355:
356: if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1) {
357: close(ifd);
358: return (FALSE);
359: }
1.49 ! db 360: while ((n = read(ifd, buf, sizeof(buf))) > 0) {
1.30 vincent 361: if (write(ofd, buf, n) != n) {
362: ewprintf("write error : %s", strerror(errno));
363: break;
364: }
365: }
366: if (fchmod(ofd, orig.st_mode) == -1)
367: ewprintf("Cannot set original mode : %s", strerror(errno));
1.1 deraadt 368:
1.30 vincent 369: if (n == -1) {
370: ewprintf("Read error : %s", strerror(errno));
371: close(ifd);
372: close(ofd);
373: return (FALSE);
1.7 millert 374: }
1.30 vincent 375: /*
1.32 vincent 376: * It is "normal" for this to fail since we can't guarantee that
1.49 ! db 377: * we will be running as root.
1.30 vincent 378: */
379: if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
380: ewprintf("Cannot set owner : %s", strerror(errno));
381:
382: (void) close(ifd);
383: (void) close(ofd);
384:
385: return (TRUE);
1.7 millert 386: }
387:
1.26 vincent 388: /*
389: * dirname needs to have enough place to store an additional '/'.
390: */
1.7 millert 391: BUFFER *
1.27 millert 392: dired_(char *dirname)
1.7 millert 393: {
1.16 mickey 394: BUFFER *bp;
395: FILE *dirpipe;
1.49 ! db 396: char line[256];
! 397: int len;
1.7 millert 398:
399: if ((dirname = adjustname(dirname)) == NULL) {
400: ewprintf("Bad directory name");
1.49 ! db 401: return (NULL);
1.7 millert 402: }
1.15 mickey 403: /* this should not be done, instead adjustname() should get a flag */
404: len = strlen(dirname);
405: if (dirname[len - 1] != '/') {
406: dirname[len++] = '/';
407: dirname[len] = '\0';
408: }
1.7 millert 409: if ((bp = findbuffer(dirname)) == NULL) {
410: ewprintf("Could not create buffer");
1.49 ! db 411: return (NULL);
1.7 millert 412: }
413: if (bclear(bp) != TRUE)
1.49 ! db 414: return (NULL);
1.26 vincent 415: bp->b_flag |= BFREADONLY;
1.38 vincent 416: if (snprintf(line, sizeof(line), "ls -al %s", dirname)
417: >= sizeof(line)) {
1.15 mickey 418: ewprintf("Path too long");
1.49 ! db 419: return (NULL);
1.15 mickey 420: }
1.7 millert 421: if ((dirpipe = popen(line, "r")) == NULL) {
422: ewprintf("Problem opening pipe to ls");
1.49 ! db 423: return (NULL);
1.7 millert 424: }
425: line[0] = line[1] = ' ';
1.15 mickey 426: while (fgets(&line[2], sizeof(line) - 2, dirpipe) != NULL) {
1.7 millert 427: line[strlen(line) - 1] = '\0'; /* remove ^J */
1.13 art 428: (void) addline(bp, line);
1.7 millert 429: }
430: if (pclose(dirpipe) == -1) {
1.38 vincent 431: ewprintf("Problem closing pipe to ls : %s",
432: strerror(errno));
1.49 ! db 433: return (NULL);
1.7 millert 434: }
435: bp->b_dotp = lforw(bp->b_linep); /* go to first line */
1.49 ! db 436: (void) strlcpy(bp->b_fname, dirname, sizeof(bp->b_fname));
1.38 vincent 437: if ((bp->b_modes[1] = name_mode("dired")) == NULL) {
1.17 art 438: bp->b_modes[0] = name_mode("fundamental");
1.7 millert 439: ewprintf("Could not find mode dired");
1.49 ! db 440: return (NULL);
1.7 millert 441: }
1.38 vincent 442: bp->b_nmodes = 1;
1.49 ! db 443: return (bp);
1.1 deraadt 444: }
445:
1.23 vincent 446: #define NAME_FIELD 8
447:
1.7 millert 448: int
1.23 vincent 449: d_makename(LINE *lp, char *fn, int len)
1.1 deraadt 450: {
1.49 ! db 451: int i;
! 452: char *p, *ep;
1.31 vincent 453:
1.23 vincent 454: strlcpy(fn, curbp->b_fname, len);
455: p = lp->l_text;
1.37 vincent 456: ep = lp->l_text + llength(lp);
1.23 vincent 457: for (i = 0; i < NAME_FIELD; i++) {
1.37 vincent 458: while (p < ep && isspace(*p))
1.23 vincent 459: p++;
1.37 vincent 460: while (p < ep && !isspace(*p))
461: p++;
462: while (p < ep && isspace(*p))
463: p++;
464: if (p == ep)
465: return (ABORT);
1.23 vincent 466: }
467: strlcat(fn, p, len);
1.49 ! db 468: return ((lgetc(lp, 2) == 'd') ? TRUE : FALSE);
1.1 deraadt 469: }
1.7 millert 470: #endif /* NO_DIRED */
1.1 deraadt 471:
472: struct filelist {
1.16 mickey 473: LIST fl_l;
474: char fl_name[NFILEN + 2];
1.1 deraadt 475: };
476:
1.7 millert 477: /*
1.1 deraadt 478: * return list of file names that match the name in buf.
479: */
1.7 millert 480: LIST *
1.25 vincent 481: make_file_list(char *buf)
1.7 millert 482: {
1.16 mickey 483: char *dir, *file, *cp;
1.49 ! db 484: int len, preflen;
1.16 mickey 485: DIR *dirp;
486: struct dirent *dent;
487: LIST *last;
1.7 millert 488: struct filelist *current;
1.49 ! db 489: char prefixx[NFILEN + 1];
1.7 millert 490:
491: /*
492: * We need three different strings: dir - the name of the directory
493: * containing what the user typed. Must be a real unix file name,
494: * e.g. no ~user, etc.. Must not end in /. prefix - the portion of
495: * what the user typed that is before the names we are going to find
496: * in the directory. Must have a trailing / if the user typed it.
1.49 ! db 497: * names from the directory. We open dir, and return prefix
1.7 millert 498: * concatenated with names.
499: */
500:
501: /* first we get a directory name we can look up */
502: /*
503: * Names ending in . are potentially odd, because adjustname will
504: * treat foo/.. as a reference to another directory, whereas we are
505: * interested in names starting with ..
506: */
507: len = strlen(buf);
508: if (buf[len - 1] == '.') {
509: buf[len - 1] = 'x';
510: dir = adjustname(buf);
511: buf[len - 1] = '.';
512: } else
513: dir = adjustname(buf);
1.33 vincent 514: if (dir == NULL)
1.36 vincent 515: return (NULL);
1.7 millert 516: /*
517: * If the user typed a trailing / or the empty string
518: * he wants us to use his file spec as a directory name.
519: */
520: if (buf[0] && buf[strlen(buf) - 1] != '/') {
521: file = strrchr(dir, '/');
522: if (file) {
523: *file = 0;
524: if (*dir == 0)
525: dir = "/";
1.49 ! db 526: } else
1.7 millert 527: return (NULL);
1.1 deraadt 528: }
1.7 millert 529: /* Now we get the prefix of the name the user typed. */
1.49 ! db 530: strlcpy(prefixx, buf, sizeof(prefixx));
1.7 millert 531: cp = strrchr(prefixx, '/');
532: if (cp == NULL)
533: prefixx[0] = 0;
534: else
535: cp[1] = 0;
536:
537: preflen = strlen(prefixx);
1.49 ! db 538: /* cp is the tail of buf that really needs to be compared. */
1.7 millert 539: cp = buf + preflen;
540: len = strlen(cp);
541:
542: /*
543: * Now make sure that file names will fit in the buffers allocated.
544: * SV files are fairly short. For BSD, something more general would
545: * be required.
546: */
547: if ((preflen + MAXNAMLEN) > NFILEN)
548: return (NULL);
549:
550: /* loop over the specified directory, making up the list of files */
551:
552: /*
553: * Note that it is worth our time to filter out names that don't
554: * match, even though our caller is going to do so again, and to
555: * avoid doing the stat if completion is being done, because stat'ing
556: * every file in the directory is relatively expensive.
557: */
1.1 deraadt 558:
1.11 art 559: dirp = opendir(dir);
560: if (dirp == NULL)
1.7 millert 561: return (NULL);
562: last = NULL;
1.11 art 563:
564: while ((dent = readdir(dirp)) != NULL) {
1.18 art 565: int isdir;
566:
1.11 art 567: if (dent->d_namlen < len || memcmp(cp, dent->d_name, len) != 0)
568: continue;
569:
1.18 art 570: isdir = 0;
571: if (dent->d_type == DT_DIR) {
572: isdir = 1;
573: } else if (dent->d_type == DT_LNK ||
574: dent->d_type == DT_UNKNOWN) {
575: struct stat statbuf;
576: char statname[NFILEN + 2];
577:
578: statbuf.st_mode = 0;
579: if (snprintf(statname, sizeof(statname), "%s/%s",
580: dir, dent->d_name) > sizeof(statname) - 1) {
581: continue;
582: }
583: if (stat(statname, &statbuf) < 0)
584: continue;
585: if (statbuf.st_mode & S_IFDIR)
586: isdir = 1;
587: }
588:
589: current = malloc(sizeof(struct filelist));
1.12 art 590: if (current == NULL)
591: break;
1.18 art 592:
1.11 art 593: if (snprintf(current->fl_name, sizeof(current->fl_name),
1.18 art 594: "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "")
595: >= sizeof(current->fl_name)) {
1.11 art 596: free(current);
1.7 millert 597: continue;
598: }
599: current->fl_l.l_next = last;
600: current->fl_l.l_name = current->fl_name;
601: last = (LIST *) current;
1.1 deraadt 602: }
1.11 art 603: closedir(dirp);
1.1 deraadt 604:
1.7 millert 605: return (last);
1.1 deraadt 606: }
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