Annotation of src/usr.bin/mg/fileio.c, Revision 1.55
1.55 ! kjell 1: /* $OpenBSD: fileio.c,v 1.54 2005/10/13 20:23:01 kjell 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"
1.1 deraadt 9:
1.53 kjell 10: #ifndef NO_DIRED
11: #include <sys/wait.h>
12: #include "kbd.h"
13: #endif /* !NO_DIRED */
14:
1.1 deraadt 15: #include <sys/types.h>
1.33 vincent 16: #include <limits.h>
1.1 deraadt 17: #include <sys/stat.h>
18: #include <sys/dir.h>
1.21 vincent 19: #include <string.h>
1.9 millert 20: #include <fcntl.h>
21: #include <unistd.h>
1.1 deraadt 22:
1.49 db 23: static FILE *ffp;
24:
1.1 deraadt 25: /*
26: * Open a file for reading.
27: */
1.7 millert 28: int
1.25 vincent 29: ffropen(const char *fn, BUFFER *bp)
1.7 millert 30: {
1.16 mickey 31: struct stat statbuf;
1.7 millert 32:
1.46 jfb 33: if ((ffp = fopen(fn, "r")) == NULL) {
34: if (errno == ENOENT)
35: return (FIOFNF);
36: return (FIOERR);
37: }
1.53 kjell 38:
39: /* If 'fn' is a directory open it with dired. */
1.54 kjell 40: if (fisdir(fn) == TRUE)
1.53 kjell 41: #ifdef NO_DIRED
42: return (FIOERR);
43: #else
44: return (FIODIR);
45: #endif /* NO_DIRED */
46:
1.1 deraadt 47: if (bp && fstat(fileno(ffp), &statbuf) == 0) {
1.7 millert 48: /* set highorder bit to make sure this isn't all zero */
1.1 deraadt 49: bp->b_fi.fi_mode = statbuf.st_mode | 0x8000;
50: bp->b_fi.fi_uid = statbuf.st_uid;
51: bp->b_fi.fi_gid = statbuf.st_gid;
52: }
1.53 kjell 53:
1.1 deraadt 54: return (FIOSUC);
55: }
56:
57: /*
58: * Open a file for writing.
59: */
1.7 millert 60: int
1.25 vincent 61: ffwopen(const char *fn, BUFFER *bp)
1.7 millert 62: {
1.49 db 63: int fd;
64: mode_t mode = DEFFILEMODE;
1.7 millert 65:
1.24 deraadt 66: if (bp && bp->b_fi.fi_mode)
67: mode = bp->b_fi.fi_mode & 07777;
68:
69: fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, mode);
70: if (fd == -1) {
71: ffp = NULL;
1.21 vincent 72: ewprintf("Cannot open file for writing : %s", strerror(errno));
1.1 deraadt 73: return (FIOERR);
1.34 deraadt 74: }
1.24 deraadt 75:
76: if ((ffp = fdopen(fd, "w")) == NULL) {
77: ewprintf("Cannot open file for writing : %s", strerror(errno));
78: close(fd);
1.34 deraadt 79: return (FIOERR);
1.1 deraadt 80: }
1.7 millert 81:
82: /*
83: * If we have file information, use it. We don't bother to check for
84: * errors, because there's no a lot we can do about it. Certainly
1.24 deraadt 85: * trying to change ownership will fail if we aren't root. That's
1.7 millert 86: * probably OK. If we don't have info, no need to get it, since any
87: * future writes will do the same thing.
1.1 deraadt 88: */
89: if (bp && bp->b_fi.fi_mode) {
1.28 deraadt 90: fchmod(fd, bp->b_fi.fi_mode & 07777);
91: fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
1.1 deraadt 92: }
93: return (FIOSUC);
94: }
95:
96: /*
97: * Close a file.
1.7 millert 98: * XXX - Should look at the status.
1.1 deraadt 99: */
1.7 millert 100: /* ARGSUSED */
101: int
1.25 vincent 102: ffclose(BUFFER *bp)
1.7 millert 103: {
1.13 art 104: (void) fclose(ffp);
1.1 deraadt 105: return (FIOSUC);
106: }
107:
108: /*
1.41 vincent 109: * Write a buffer to the already opened file. bp points to the
1.1 deraadt 110: * buffer. Return the status.
111: */
1.7 millert 112: int
1.25 vincent 113: ffputbuf(BUFFER *bp)
1.1 deraadt 114: {
1.41 vincent 115: LINE *lp, *lpend;
1.7 millert 116:
117: lpend = bp->b_linep;
1.41 vincent 118: for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
119: if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
120: ewprintf("Write I/O error");
1.49 db 121: return (FIOERR);
1.7 millert 122: }
1.41 vincent 123: if (lforw(lp) != lpend) /* no implied \n on last line */
124: putc('\n', ffp);
1.48 deraadt 125: }
1.42 vincent 126: /*
127: * XXX should be variable controlled (once we have variables)
128: */
129: if (llength(lback(lpend)) != 0) {
130: if (eyorn("No newline at end of file, add one") == TRUE) {
131: lnewline_at(lback(lpend), llength(lback(lpend)));
132: putc('\n', ffp);
133: }
134: }
1.7 millert 135: return (FIOSUC);
1.1 deraadt 136: }
137:
138: /*
139: * Read a line from a file, and store the bytes
140: * in the supplied buffer. Stop on end of file or end of
141: * line. When FIOEOF is returned, there is a valid line
142: * of data without the normally implied \n.
143: */
1.7 millert 144: int
1.25 vincent 145: ffgetline(char *buf, int nbuf, int *nbytes)
1.1 deraadt 146: {
1.16 mickey 147: int c, i;
1.1 deraadt 148:
149: i = 0;
1.7 millert 150: while ((c = getc(ffp)) != EOF && c != '\n') {
1.1 deraadt 151: buf[i++] = c;
1.7 millert 152: if (i >= nbuf)
1.49 db 153: return (FIOLONG);
1.1 deraadt 154: }
1.7 millert 155: if (c == EOF && ferror(ffp) != FALSE) {
1.1 deraadt 156: ewprintf("File read error");
1.49 db 157: return (FIOERR);
1.1 deraadt 158: }
159: *nbytes = i;
1.49 db 160: return (c == EOF ? FIOEOF : FIOSUC);
1.1 deraadt 161: }
162:
163: #ifndef NO_BACKUP
164: /*
1.9 millert 165: * Make a backup copy of "fname". On Unix the backup has the same
166: * name as the original file, with a "~" on the end; this seems to
167: * be newest of the new-speak. The error handling is all in "file.c".
168: * We do a copy instead of a rename since otherwise another process
169: * with an open fd will get the backup, not the new file. This is
170: * a problem when using mg with things like crontab and vipw.
1.1 deraadt 171: */
1.7 millert 172: int
1.25 vincent 173: fbackupfile(const char *fn)
1.7 millert 174: {
1.49 db 175: struct stat sb;
176: int from, to, serrno;
177: ssize_t nread;
178: char buf[BUFSIZ];
1.44 millert 179: char *nname, *tname;
1.1 deraadt 180:
1.35 vincent 181: if (stat(fn, &sb) == -1) {
182: ewprintf("Can't stat %s : %s", fn, strerror(errno));
183: return (FALSE);
184: }
185:
1.21 vincent 186: if (asprintf(&nname, "%s~", fn) == -1) {
1.44 millert 187: ewprintf("Can't allocate temp file name : %s", strerror(errno));
188: return (ABORT);
189: }
190:
191: if (asprintf(&tname, "%s.XXXXXXXXXX", fn) == -1) {
192: ewprintf("Can't allocate temp file name : %s", strerror(errno));
193: free(nname);
1.1 deraadt 194: return (ABORT);
1.9 millert 195: }
196:
1.21 vincent 197: if ((from = open(fn, O_RDONLY)) == -1) {
198: free(nname);
1.44 millert 199: free(tname);
1.1 deraadt 200: return (FALSE);
1.21 vincent 201: }
1.44 millert 202: to = mkstemp(tname);
1.9 millert 203: if (to == -1) {
204: serrno = errno;
205: close(from);
1.21 vincent 206: free(nname);
1.44 millert 207: free(tname);
1.9 millert 208: errno = serrno;
209: return (FALSE);
210: }
211: while ((nread = read(from, buf, sizeof(buf))) > 0) {
212: if (write(to, buf, nread) != nread) {
1.40 vincent 213: nread = -1;
214: break;
1.9 millert 215: }
1.1 deraadt 216: }
1.9 millert 217: serrno = errno;
1.44 millert 218: (void) fchmod(to, (sb.st_mode & 0777));
1.9 millert 219: close(from);
220: close(to);
1.21 vincent 221: if (nread == -1) {
1.44 millert 222: if (unlink(tname) == -1)
1.21 vincent 223: ewprintf("Can't unlink temp : %s", strerror(errno));
1.44 millert 224: } else {
225: if (rename(tname, nname) == -1) {
226: ewprintf("Can't rename temp : %s", strerror(errno));
227: (void) unlink(tname);
1.45 henning 228: nread = -1;
1.44 millert 229: }
1.21 vincent 230: }
1.1 deraadt 231: free(nname);
1.44 millert 232: free(tname);
1.9 millert 233: errno = serrno;
1.22 deraadt 234:
1.9 millert 235: return (nread == -1 ? FALSE : TRUE);
1.1 deraadt 236: }
237: #endif
238:
239: /*
240: * The string "fn" is a file name.
241: * Perform any required appending of directory name or case adjustments.
1.39 jmc 242: * If NO_DIR is not defined, the same file should be referred to even if the
1.1 deraadt 243: * working directory changes.
244: */
245: #ifdef SYMBLINK
246: #include <sys/types.h>
247: #include <sys/stat.h>
248: #ifndef MAXLINK
249: #define MAXLINK 8 /* maximum symbolic links to follow */
250: #endif
251: #endif
252: #include <pwd.h>
253: #ifndef NO_DIR
1.16 mickey 254: extern char *wdir;
1.1 deraadt 255: #endif
256:
1.7 millert 257: char *
1.25 vincent 258: adjustname(const char *fn)
1.1 deraadt 259: {
1.49 db 260: static char fnb[MAXPATHLEN];
261: const char *cp;
262: char user[LOGIN_NAME_MAX + 1], path[MAXPATHLEN];
263: int len;
1.33 vincent 264:
265: path[0] = '\0';
266: /* first handle tilde expansion */
267: if (fn[0] == '~') {
268: struct passwd *pw;
269:
270: cp = strchr(fn, '/');
271: if (cp == NULL)
272: cp = fn + strlen(fn); /* point to the NUL byte */
1.1 deraadt 273:
1.33 vincent 274: if ((cp - &fn[1]) > LOGIN_NAME_MAX) {
275: ewprintf("login name too long");
276: return (NULL);
277: }
278: if (cp == &fn[1]) /* ~/ */
1.49 db 279: strlcpy(user, getlogin(), sizeof(user));
1.33 vincent 280: else
281: strlcpy(user, &fn[1], cp - &fn[1] + 1);
282: pw = getpwnam(user);
283: if (pw == NULL) {
284: ewprintf("unknown user %s", user);
285: return (NULL);
286: }
1.49 db 287: strlcpy(path, pw->pw_dir, sizeof(path) - 1);
1.33 vincent 288: len = strlen(path);
289: if (path[len] != '/') {
290: path[len] = '/';
291: path[len + 1] = '\0';
1.1 deraadt 292: }
1.33 vincent 293: fn = cp;
294: if (*fn == '/')
1.7 millert 295: fn++;
296: }
1.49 db 297: strlcat(path, fn, sizeof(path));
1.33 vincent 298:
1.47 henning 299: if (realpath(path, fnb) == NULL)
300: strlcpy(fnb, path, sizeof(fnb));
301:
302: return (fnb);
1.1 deraadt 303: }
304:
305: #ifndef NO_STARTUP
306: /*
307: * Find a startup file for the user and return its name. As a service
308: * to other pieces of code that may want to find a startup file (like
309: * the terminal driver in particular), accepts a suffix to be appended
310: * to the startup file name.
311: */
312: char *
1.27 millert 313: startupfile(char *suffix)
1.1 deraadt 314: {
1.49 db 315: static char file[NFILEN];
1.16 mickey 316: char *home;
1.12 art 317:
318: if ((home = getenv("HOME")) == NULL || *home == '\0')
319: goto nohome;
1.1 deraadt 320:
1.12 art 321: if (suffix == NULL) {
322: if (snprintf(file, sizeof(file), "%s/.mg", home)
1.32 vincent 323: >= sizeof(file))
324: return (NULL);
1.12 art 325: } else {
326: if (snprintf(file, sizeof(file), "%s/.mg-%s", home, suffix)
1.32 vincent 327: >= sizeof(file))
328: return (NULL);
1.1 deraadt 329: }
1.12 art 330:
331: if (access(file, R_OK) == 0)
1.32 vincent 332: return (file);
1.12 art 333: nohome:
334: #ifdef STARTUPFILE
1.27 millert 335: if (suffix == NULL) {
1.12 art 336: if (snprintf(file, sizeof(file), "%s", STARTUPFILE)
1.32 vincent 337: >= sizeof(file))
338: return (NULL);
1.12 art 339: } else {
340: if (snprintf(file, sizeof(file), "%s%s", STARTUPFILE, suffix)
1.32 vincent 341: >= sizeof(file))
342: return (NULL);
1.12 art 343: }
344:
345: if (access(file, R_OK) == 0)
1.32 vincent 346: return (file);
1.1 deraadt 347: #endif
1.32 vincent 348: return (NULL);
1.1 deraadt 349: }
350: #endif
351:
352: #ifndef NO_DIRED
353:
1.7 millert 354: int
1.27 millert 355: copy(char *frname, char *toname)
1.1 deraadt 356: {
1.49 db 357: int ifd, ofd, n;
358: char buf[BUFSIZ];
359: mode_t mode = DEFFILEMODE; /* XXX?? */
360: struct stat orig;
1.30 vincent 361:
362: if ((ifd = open(frname, O_RDONLY)) == -1)
363: return (FALSE);
364: if (fstat(ifd, &orig) == -1) {
365: ewprintf("fstat: %s", strerror(errno));
366: close(ifd);
367: return (FALSE);
368: }
369:
370: if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1) {
371: close(ifd);
372: return (FALSE);
373: }
1.49 db 374: while ((n = read(ifd, buf, sizeof(buf))) > 0) {
1.30 vincent 375: if (write(ofd, buf, n) != n) {
376: ewprintf("write error : %s", strerror(errno));
377: break;
378: }
379: }
380: if (fchmod(ofd, orig.st_mode) == -1)
381: ewprintf("Cannot set original mode : %s", strerror(errno));
1.1 deraadt 382:
1.30 vincent 383: if (n == -1) {
384: ewprintf("Read error : %s", strerror(errno));
385: close(ifd);
386: close(ofd);
387: return (FALSE);
1.7 millert 388: }
1.30 vincent 389: /*
1.32 vincent 390: * It is "normal" for this to fail since we can't guarantee that
1.49 db 391: * we will be running as root.
1.30 vincent 392: */
393: if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
394: ewprintf("Cannot set owner : %s", strerror(errno));
395:
396: (void) close(ifd);
397: (void) close(ofd);
398:
399: return (TRUE);
1.7 millert 400: }
401:
402: #endif /* NO_DIRED */
1.1 deraadt 403:
404: struct filelist {
1.16 mickey 405: LIST fl_l;
406: char fl_name[NFILEN + 2];
1.1 deraadt 407: };
408:
1.7 millert 409: /*
1.1 deraadt 410: * return list of file names that match the name in buf.
411: */
1.7 millert 412: LIST *
1.25 vincent 413: make_file_list(char *buf)
1.7 millert 414: {
1.16 mickey 415: char *dir, *file, *cp;
1.49 db 416: int len, preflen;
1.16 mickey 417: DIR *dirp;
418: struct dirent *dent;
419: LIST *last;
1.7 millert 420: struct filelist *current;
1.49 db 421: char prefixx[NFILEN + 1];
1.7 millert 422:
423: /*
424: * We need three different strings: dir - the name of the directory
425: * containing what the user typed. Must be a real unix file name,
426: * e.g. no ~user, etc.. Must not end in /. prefix - the portion of
427: * what the user typed that is before the names we are going to find
428: * in the directory. Must have a trailing / if the user typed it.
1.49 db 429: * names from the directory. We open dir, and return prefix
1.7 millert 430: * concatenated with names.
431: */
432:
433: /* first we get a directory name we can look up */
434: /*
435: * Names ending in . are potentially odd, because adjustname will
436: * treat foo/.. as a reference to another directory, whereas we are
437: * interested in names starting with ..
438: */
439: len = strlen(buf);
440: if (buf[len - 1] == '.') {
441: buf[len - 1] = 'x';
442: dir = adjustname(buf);
443: buf[len - 1] = '.';
444: } else
445: dir = adjustname(buf);
1.33 vincent 446: if (dir == NULL)
1.36 vincent 447: return (NULL);
1.7 millert 448: /*
449: * If the user typed a trailing / or the empty string
450: * he wants us to use his file spec as a directory name.
451: */
452: if (buf[0] && buf[strlen(buf) - 1] != '/') {
453: file = strrchr(dir, '/');
454: if (file) {
455: *file = 0;
456: if (*dir == 0)
457: dir = "/";
1.49 db 458: } else
1.7 millert 459: return (NULL);
1.1 deraadt 460: }
1.7 millert 461: /* Now we get the prefix of the name the user typed. */
1.49 db 462: strlcpy(prefixx, buf, sizeof(prefixx));
1.7 millert 463: cp = strrchr(prefixx, '/');
464: if (cp == NULL)
465: prefixx[0] = 0;
466: else
467: cp[1] = 0;
468:
469: preflen = strlen(prefixx);
1.49 db 470: /* cp is the tail of buf that really needs to be compared. */
1.7 millert 471: cp = buf + preflen;
472: len = strlen(cp);
473:
474: /*
475: * Now make sure that file names will fit in the buffers allocated.
476: * SV files are fairly short. For BSD, something more general would
477: * be required.
478: */
479: if ((preflen + MAXNAMLEN) > NFILEN)
480: return (NULL);
481:
482: /* loop over the specified directory, making up the list of files */
483:
484: /*
485: * Note that it is worth our time to filter out names that don't
486: * match, even though our caller is going to do so again, and to
487: * avoid doing the stat if completion is being done, because stat'ing
488: * every file in the directory is relatively expensive.
489: */
1.1 deraadt 490:
1.11 art 491: dirp = opendir(dir);
492: if (dirp == NULL)
1.7 millert 493: return (NULL);
494: last = NULL;
1.11 art 495:
496: while ((dent = readdir(dirp)) != NULL) {
1.18 art 497: int isdir;
498:
1.11 art 499: if (dent->d_namlen < len || memcmp(cp, dent->d_name, len) != 0)
500: continue;
501:
1.18 art 502: isdir = 0;
503: if (dent->d_type == DT_DIR) {
504: isdir = 1;
505: } else if (dent->d_type == DT_LNK ||
506: dent->d_type == DT_UNKNOWN) {
507: struct stat statbuf;
508: char statname[NFILEN + 2];
509:
510: statbuf.st_mode = 0;
511: if (snprintf(statname, sizeof(statname), "%s/%s",
512: dir, dent->d_name) > sizeof(statname) - 1) {
513: continue;
514: }
515: if (stat(statname, &statbuf) < 0)
516: continue;
517: if (statbuf.st_mode & S_IFDIR)
518: isdir = 1;
519: }
520:
521: current = malloc(sizeof(struct filelist));
1.12 art 522: if (current == NULL)
523: break;
1.18 art 524:
1.11 art 525: if (snprintf(current->fl_name, sizeof(current->fl_name),
1.18 art 526: "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "")
527: >= sizeof(current->fl_name)) {
1.11 art 528: free(current);
1.7 millert 529: continue;
530: }
531: current->fl_l.l_next = last;
532: current->fl_l.l_name = current->fl_name;
533: last = (LIST *) current;
1.1 deraadt 534: }
1.11 art 535: closedir(dirp);
1.1 deraadt 536:
1.7 millert 537: return (last);
1.54 kjell 538: }
539:
540: /*
541: * Test if a supplied filename refers to a directory
542: * Returns ABORT on error, TRUE if directory. FALSE otherwise
543: */
544: int
545: fisdir(const char *fname)
546: {
547: struct stat statbuf;
548:
549: if (stat(fname, &statbuf) != 0)
550: return (ABORT);
551:
552: if (S_ISDIR(statbuf.st_mode))
553: return (TRUE);
554:
555: return (FALSE);
1.1 deraadt 556: }
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