--- /dev/null
+/* $OpenBSD: fileio.c,v 1.94 2012/07/10 06:28:12 lum Exp $ */
+
+/* This file is in the public domain. */
+
+/*
+ * POSIX fileio.c
+ */
+#include "def.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+
+#include <fcntl.h>
+#include <limits.h>
+#include <dirent.h>
+#include <pwd.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "kbd.h"
+#include "pathnames.h"
+
+static char *bkuplocation(const char *);
+static int bkupleavetmp(const char *);
+char *expandtilde(const char *);
+
+static char *bkupdir;
+static int leavetmp = 0; /* 1 = leave any '~' files in tmp dir */
+
+/*
+ * Open a file for reading.
+ */
+int
+ffropen(FILE ** ffp, const char *fn, struct buffer *bp)
+{
+ if ((*ffp = fopen(fn, "r")) == NULL) {
+ if (errno == ENOENT)
+ return (FIOFNF);
+ return (FIOERR);
+ }
+
+ /* If 'fn' is a directory open it with dired. */
+ if (fisdir(fn) == TRUE)
+ return (FIODIR);
+
+ ffstat(*ffp, bp);
+
+ return (FIOSUC);
+}
+
+/*
+ * Update stat/dirty info
+ */
+void
+ffstat(FILE *ffp, struct buffer *bp)
+{
+ struct stat sb;
+
+ if (bp && fstat(fileno(ffp), &sb) == 0) {
+ /* set highorder bit to make sure this isn't all zero */
+ bp->b_fi.fi_mode = sb.st_mode | 0x8000;
+ bp->b_fi.fi_uid = sb.st_uid;
+ bp->b_fi.fi_gid = sb.st_gid;
+ bp->b_fi.fi_mtime = sb.st_mtimespec;
+ /* Clear the ignore flag */
+ bp->b_flag &= ~(BFIGNDIRTY | BFDIRTY);
+ }
+}
+
+/*
+ * Update the status/dirty info. If there is an error,
+ * there's not a lot we can do.
+ */
+int
+fupdstat(struct buffer *bp)
+{
+ FILE *ffp;
+
+ if ((ffp = fopen(bp->b_fname, "r")) == NULL) {
+ if (errno == ENOENT)
+ return (FIOFNF);
+ return (FIOERR);
+ }
+ ffstat(ffp, bp);
+ (void)ffclose(ffp, bp);
+ return (FIOSUC);
+}
+
+/*
+ * Open a file for writing.
+ */
+int
+ffwopen(FILE ** ffp, const char *fn, struct buffer *bp)
+{
+ int fd;
+ mode_t fmode = DEFFILEMODE;
+
+ if (bp && bp->b_fi.fi_mode)
+ fmode = bp->b_fi.fi_mode & 07777;
+
+ fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, fmode);
+ if (fd == -1) {
+ ffp = NULL;
+ ewprintf("Cannot open file for writing : %s", strerror(errno));
+ return (FIOERR);
+ }
+
+ if ((*ffp = fdopen(fd, "w")) == NULL) {
+ ewprintf("Cannot open file for writing : %s", strerror(errno));
+ close(fd);
+ return (FIOERR);
+ }
+
+ /*
+ * If we have file information, use it. We don't bother to check for
+ * errors, because there's no a lot we can do about it. Certainly
+ * trying to change ownership will fail if we aren't root. That's
+ * probably OK. If we don't have info, no need to get it, since any
+ * future writes will do the same thing.
+ */
+ if (bp && bp->b_fi.fi_mode) {
+ fchmod(fd, bp->b_fi.fi_mode & 07777);
+ fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
+ }
+ return (FIOSUC);
+}
+
+/*
+ * Close a file.
+ */
+/* ARGSUSED */
+int
+ffclose(FILE *ffp, struct buffer *bp)
+{
+ if (fclose(ffp) == 0)
+ return (FIOSUC);
+ return (FIOERR);
+}
+
+/*
+ * Write a buffer to the already opened file. bp points to the
+ * buffer. Return the status.
+ */
+int
+ffputbuf(FILE *ffp, struct buffer *bp)
+{
+ struct line *lp, *lpend;
+
+ lpend = bp->b_headp;
+ for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
+ if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
+ ewprintf("Write I/O error");
+ return (FIOERR);
+ }
+ if (lforw(lp) != lpend) /* no implied \n on last line */
+ putc('\n', ffp);
+ }
+ /*
+ * XXX should be variable controlled (once we have variables)
+ */
+ if (llength(lback(lpend)) != 0) {
+ if (eyorn("No newline at end of file, add one") == TRUE) {
+ lnewline_at(lback(lpend), llength(lback(lpend)));
+ putc('\n', ffp);
+ }
+ }
+ return (FIOSUC);
+}
+
+/*
+ * Read a line from a file, and store the bytes
+ * in the supplied buffer. Stop on end of file or end of
+ * line. When FIOEOF is returned, there is a valid line
+ * of data without the normally implied \n.
+ * If the line length exceeds nbuf, FIOLONG is returned.
+ */
+int
+ffgetline(FILE *ffp, char *buf, int nbuf, int *nbytes)
+{
+ int c, i;
+
+ i = 0;
+ while ((c = getc(ffp)) != EOF && c != '\n') {
+ buf[i++] = c;
+ if (i >= nbuf)
+ return (FIOLONG);
+ }
+ if (c == EOF && ferror(ffp) != FALSE) {
+ ewprintf("File read error");
+ return (FIOERR);
+ }
+ *nbytes = i;
+ return (c == EOF ? FIOEOF : FIOSUC);
+}
+
+/*
+ * Make a backup copy of "fname". On Unix the backup has the same
+ * name as the original file, with a "~" on the end; this seems to
+ * be newest of the new-speak. The error handling is all in "file.c".
+ * We do a copy instead of a rename since otherwise another process
+ * with an open fd will get the backup, not the new file. This is
+ * a problem when using mg with things like crontab and vipw.
+ */
+int
+fbackupfile(const char *fn)
+{
+ struct stat sb;
+ int from, to, serrno;
+ ssize_t nread;
+ char buf[BUFSIZ];
+ char *nname, *tname, *bkpth;
+
+ if (stat(fn, &sb) == -1) {
+ ewprintf("Can't stat %s : %s", fn, strerror(errno));
+ return (FALSE);
+ }
+
+ if ((bkpth = bkuplocation(fn)) == NULL)
+ return (FALSE);
+
+ if (asprintf(&nname, "%s~", bkpth) == -1) {
+ ewprintf("Can't allocate backup file name : %s", strerror(errno));
+ free(bkpth);
+ return (ABORT);
+ }
+ if (asprintf(&tname, "%s.XXXXXXXXXX", bkpth) == -1) {
+ ewprintf("Can't allocate temp file name : %s", strerror(errno));
+ free(bkpth);
+ free(nname);
+ return (ABORT);
+ }
+ free(bkpth);
+
+ if ((from = open(fn, O_RDONLY)) == -1) {
+ free(nname);
+ free(tname);
+ return (FALSE);
+ }
+ to = mkstemp(tname);
+ if (to == -1) {
+ serrno = errno;
+ close(from);
+ free(nname);
+ free(tname);
+ errno = serrno;
+ return (FALSE);
+ }
+ while ((nread = read(from, buf, sizeof(buf))) > 0) {
+ if (write(to, buf, (size_t)nread) != nread) {
+ nread = -1;
+ break;
+ }
+ }
+ serrno = errno;
+ (void) fchmod(to, (sb.st_mode & 0777));
+ close(from);
+ close(to);
+ if (nread == -1) {
+ if (unlink(tname) == -1)
+ ewprintf("Can't unlink temp : %s", strerror(errno));
+ } else {
+ if (rename(tname, nname) == -1) {
+ ewprintf("Can't rename temp : %s", strerror(errno));
+ (void) unlink(tname);
+ nread = -1;
+ }
+ }
+ free(nname);
+ free(tname);
+ errno = serrno;
+
+ return (nread == -1 ? FALSE : TRUE);
+}
+
+/*
+ * Convert "fn" to a canonicalized absolute filename, replacing
+ * a leading ~/ with the user's home dir, following symlinks, and
+ * and remove all occurrences of /./ and /../
+ */
+char *
+adjustname(const char *fn, int slashslash)
+{
+ static char fnb[MAXPATHLEN];
+ const char *cp, *ep = NULL;
+ char *path;
+
+ if (slashslash == TRUE) {
+ cp = fn + strlen(fn) - 1;
+ for (; cp >= fn; cp--) {
+ if (ep && (*cp == '/')) {
+ fn = ep;
+ break;
+ }
+ if (*cp == '/' || *cp == '~')
+ ep = cp;
+ else
+ ep = NULL;
+ }
+ }
+ if ((path = expandtilde(fn)) == NULL)
+ return (NULL);
+
+ if (realpath(path, fnb) == NULL)
+ (void)strlcpy(fnb, path, sizeof(fnb));
+
+ free(path);
+ return (fnb);
+}
+
+/*
+ * Find a startup file for the user and return its name. As a service
+ * to other pieces of code that may want to find a startup file (like
+ * the terminal driver in particular), accepts a suffix to be appended
+ * to the startup file name.
+ */
+char *
+startupfile(char *suffix)
+{
+ static char file[NFILEN];
+ char *home;
+ int ret;
+
+ if ((home = getenv("HOME")) == NULL || *home == '\0')
+ goto nohome;
+
+ if (suffix == NULL) {
+ ret = snprintf(file, sizeof(file), _PATH_MG_STARTUP, home);
+ if (ret < 0 || ret >= sizeof(file))
+ return (NULL);
+ } else {
+ ret = snprintf(file, sizeof(file), _PATH_MG_TERM, home, suffix);
+ if (ret < 0 || ret >= sizeof(file))
+ return (NULL);
+ }
+
+ if (access(file, R_OK) == 0)
+ return (file);
+nohome:
+#ifdef STARTUPFILE
+ if (suffix == NULL) {
+ ret = snprintf(file, sizeof(file), "%s", STARTUPFILE);
+ if (ret < 0 || ret >= sizeof(file))
+ return (NULL);
+ } else {
+ ret = snprintf(file, sizeof(file), "%s%s", STARTUPFILE,
+ suffix);
+ if (ret < 0 || ret >= sizeof(file))
+ return (NULL);
+ }
+
+ if (access(file, R_OK) == 0)
+ return (file);
+#endif /* STARTUPFILE */
+ return (NULL);
+}
+
+int
+copy(char *frname, char *toname)
+{
+ int ifd, ofd;
+ char buf[BUFSIZ];
+ mode_t fmode = DEFFILEMODE; /* XXX?? */
+ struct stat orig;
+ ssize_t sr;
+
+ if ((ifd = open(frname, O_RDONLY)) == -1)
+ return (FALSE);
+ if (fstat(ifd, &orig) == -1) {
+ ewprintf("fstat: %s", strerror(errno));
+ close(ifd);
+ return (FALSE);
+ }
+
+ if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, fmode)) == -1) {
+ close(ifd);
+ return (FALSE);
+ }
+ while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
+ if (write(ofd, buf, (size_t)sr) != sr) {
+ ewprintf("write error : %s", strerror(errno));
+ break;
+ }
+ }
+ if (fchmod(ofd, orig.st_mode) == -1)
+ ewprintf("Cannot set original mode : %s", strerror(errno));
+
+ if (sr == -1) {
+ ewprintf("Read error : %s", strerror(errno));
+ close(ifd);
+ close(ofd);
+ return (FALSE);
+ }
+ /*
+ * It is "normal" for this to fail since we can't guarantee that
+ * we will be running as root.
+ */
+ if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
+ ewprintf("Cannot set owner : %s", strerror(errno));
+
+ (void) close(ifd);
+ (void) close(ofd);
+
+ return (TRUE);
+}
+
+/*
+ * return list of file names that match the name in buf.
+ */
+struct list *
+make_file_list(char *buf)
+{
+ char *dir, *file, *cp;
+ size_t len, preflen;
+ int ret;
+ DIR *dirp;
+ struct dirent *dent;
+ struct list *last, *current;
+ char fl_name[NFILEN + 2];
+ char prefixx[NFILEN + 1];
+
+ /*
+ * We need three different strings:
+
+ * dir - the name of the directory containing what the user typed.
+ * Must be a real unix file name, e.g. no ~user, etc..
+ * Must not end in /.
+ * prefix - the portion of what the user typed that is before the
+ * names we are going to find in the directory. Must have a
+ * trailing / if the user typed it.
+ * names from the directory - We open dir, and return prefix
+ * concatenated with names.
+ */
+
+ /* first we get a directory name we can look up */
+ /*
+ * Names ending in . are potentially odd, because adjustname will
+ * treat foo/bar/.. as a foo/, whereas we are
+ * interested in names starting with ..
+ */
+ len = strlen(buf);
+ if (len && buf[len - 1] == '.') {
+ buf[len - 1] = 'x';
+ dir = adjustname(buf, TRUE);
+ buf[len - 1] = '.';
+ } else
+ dir = adjustname(buf, TRUE);
+ if (dir == NULL)
+ return (NULL);
+ /*
+ * If the user typed a trailing / or the empty string
+ * he wants us to use his file spec as a directory name.
+ */
+ if (len && buf[len - 1] != '/') {
+ file = strrchr(dir, '/');
+ if (file) {
+ *file = '\0';
+ if (*dir == '\0')
+ dir = "/";
+ } else
+ return (NULL);
+ }
+ /* Now we get the prefix of the name the user typed. */
+ if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
+ return (NULL);
+ cp = strrchr(prefixx, '/');
+ if (cp == NULL)
+ prefixx[0] = '\0';
+ else
+ cp[1] = '\0';
+
+ preflen = strlen(prefixx);
+ /* cp is the tail of buf that really needs to be compared. */
+ cp = buf + preflen;
+ len = strlen(cp);
+
+ /*
+ * Now make sure that file names will fit in the buffers allocated.
+ * SV files are fairly short. For BSD, something more general would
+ * be required.
+ */
+ if (preflen > NFILEN - MAXNAMLEN)
+ return (NULL);
+
+ /* loop over the specified directory, making up the list of files */
+
+ /*
+ * Note that it is worth our time to filter out names that don't
+ * match, even though our caller is going to do so again, and to
+ * avoid doing the stat if completion is being done, because stat'ing
+ * every file in the directory is relatively expensive.
+ */
+
+ dirp = opendir(dir);
+ if (dirp == NULL)
+ return (NULL);
+ last = NULL;
+
+ while ((dent = readdir(dirp)) != NULL) {
+ int isdir;
+ if (strncmp(cp, dent->d_name, len) != 0)
+ continue;
+ isdir = 0;
+ if (dent->d_type == DT_DIR) {
+ isdir = 1;
+ } else if (dent->d_type == DT_LNK ||
+ dent->d_type == DT_UNKNOWN) {
+ struct stat statbuf;
+ char statname[NFILEN + 2];
+
+ statbuf.st_mode = 0;
+ ret = snprintf(statname, sizeof(statname), "%s/%s",
+ dir, dent->d_name);
+ if (ret < 0 || ret > sizeof(statname) - 1)
+ continue;
+ if (stat(statname, &statbuf) < 0)
+ continue;
+ if (S_ISDIR(statbuf.st_mode))
+ isdir = 1;
+ }
+
+ if ((current = malloc(sizeof(struct list))) == NULL) {
+ free_file_list(last);
+ closedir(dirp);
+ return (NULL);
+ }
+ ret = snprintf(fl_name, sizeof(fl_name),
+ "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
+ if (ret < 0 || ret >= sizeof(fl_name)) {
+ free(current);
+ continue;
+ }
+ current->l_next = last;
+ current->l_name = strdup(fl_name);
+ last = current;
+ }
+ closedir(dirp);
+
+ return (last);
+}
+
+/*
+ * Test if a supplied filename refers to a directory
+ * Returns ABORT on error, TRUE if directory. FALSE otherwise
+ */
+int
+fisdir(const char *fname)
+{
+ struct stat statbuf;
+
+ if (stat(fname, &statbuf) != 0)
+ return (ABORT);
+
+ if (S_ISDIR(statbuf.st_mode))
+ return (TRUE);
+
+ return (FALSE);
+}
+
+/*
+ * Check the mtime of the supplied filename.
+ * Return TRUE if last mtime matches, FALSE if not,
+ * If the stat fails, return TRUE and try the save anyway
+ */
+int
+fchecktime(struct buffer *bp)
+{
+ struct stat sb;
+
+ if (stat(bp->b_fname, &sb) == -1)
+ return (TRUE);
+
+ if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtimespec.tv_sec ||
+ bp->b_fi.fi_mtime.tv_nsec != sb.st_mtimespec.tv_nsec)
+ return (FALSE);
+
+ return (TRUE);
+
+}
+
+/*
+ * Location of backup file. This function creates the correct path.
+ */
+static char *
+bkuplocation(const char *fn)
+{
+ struct stat sb;
+ char *ret;
+
+ if (bkupdir != NULL && (stat(bkupdir, &sb) == 0) &&
+ S_ISDIR(sb.st_mode) && !bkupleavetmp(fn)) {
+ char fname[NFILEN];
+ const char *c;
+ int i = 0, len;
+
+ c = fn;
+ len = strlen(bkupdir);
+
+ while (*c != '\0') {
+ /* Make sure we don't go over combined:
+ * strlen(bkupdir + '/' + fname + '\0')
+ */
+ if (i >= NFILEN - len - 1)
+ return (NULL);
+ if (*c == '/') {
+ fname[i] = '!';
+ } else if (*c == '!') {
+ if (i >= NFILEN - len - 2)
+ return (NULL);
+ fname[i++] = '!';
+ fname[i] = '!';
+ } else
+ fname[i] = *c;
+ i++;
+ c++;
+ }
+ fname[i] = '\0';
+ if (asprintf(&ret, "%s/%s", bkupdir, fname) == -1)
+ return (NULL);
+
+ } else if ((ret = strndup(fn, NFILEN)) == NULL)
+ return (NULL);
+
+ return (ret);
+}
+
+int
+backuptohomedir(int f, int n)
+{
+ const char *c = _PATH_MG_DIR;
+ char *p;
+
+ if (bkupdir == NULL) {
+ p = adjustname(c, TRUE);
+ bkupdir = strndup(p, NFILEN);
+ if (bkupdir == NULL)
+ return(FALSE);
+
+ if (mkdir(bkupdir, 0700) == -1 && errno != EEXIST) {
+ free(bkupdir);
+ bkupdir = NULL;
+ }
+ } else {
+ free(bkupdir);
+ bkupdir = NULL;
+ }
+
+ return (TRUE);
+}
+
+/*
+ * For applications that use mg as the editor and have a desire to keep
+ * '~' files in the TMPDIR, toggle the location: /tmp | ~/.mg.d
+ */
+int
+toggleleavetmp(int f, int n)
+{
+ leavetmp = !leavetmp;
+
+ return (TRUE);
+}
+
+/*
+ * Returns TRUE if fn is located in the temp directory and we want to save
+ * those backups there.
+ */
+int
+bkupleavetmp(const char *fn)
+{
+ char *tmpdir, *tmp = NULL;
+
+ if (!leavetmp)
+ return(FALSE);
+
+ if((tmpdir = getenv("TMPDIR")) != NULL && *tmpdir != '\0') {
+ tmp = strstr(fn, tmpdir);
+ if (tmp == fn)
+ return (TRUE);
+
+ return (FALSE);
+ }
+
+ tmp = strstr(fn, "/tmp");
+ if (tmp == fn)
+ return (TRUE);
+
+ return (FALSE);
+}
+
+/*
+ * Expand file names beginning with '~' if appropriate:
+ * 1, if ./~fn exists, continue without expanding tilde.
+ * 2, else, if username 'fn' exists, expand tilde with home directory path.
+ * 3, otherwise, continue and create new buffer called ~fn.
+ */
+char *
+expandtilde(const char *fn)
+{
+ struct passwd *pw;
+ struct stat statbuf;
+ const char *cp;
+ char user[LOGIN_NAME_MAX], path[NFILEN];
+ char *un, *ret;
+ size_t ulen, plen;
+
+ path[0] = '\0';
+
+ if (fn[0] != '~' || stat(fn, &statbuf) == 0) {
+ if ((ret = strndup(fn, NFILEN)) == NULL)
+ return (NULL);
+ return(ret);
+ }
+ cp = strchr(fn, '/');
+ if (cp == NULL)
+ cp = fn + strlen(fn); /* point to the NUL byte */
+ ulen = cp - &fn[1];
+ if (ulen >= sizeof(user)) {
+ if ((ret = strndup(fn, NFILEN)) == NULL)
+ return (NULL);
+ return(ret);
+ }
+ if (ulen == 0) { /* ~/ or ~ */
+ if ((un = getlogin()) != NULL)
+ (void)strlcpy(user, un, sizeof(user));
+ else
+ user[0] = '\0';
+ } else { /* ~user/ or ~user */
+ memcpy(user, &fn[1], ulen);
+ user[ulen] = '\0';
+ }
+ pw = getpwnam(user);
+ if (pw != NULL) {
+ plen = strlcpy(path, pw->pw_dir, sizeof(path));
+ if (plen == 0 || path[plen - 1] != '/') {
+ if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
+ ewprintf("Path too long");
+ return (NULL);
+ }
+ }
+ fn = cp;
+ if (*fn == '/')
+ fn++;
+ }
+ if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
+ ewprintf("Path too long");
+ return (NULL);
+ }
+ if ((ret = strndup(path, NFILEN)) == NULL)
+ return (NULL);
+
+ return (ret);
+}
projects / pd_readline / blobdiff