File: [local] / src / usr.bin / mg / fileio.c (download)
Revision 1.34, Thu Aug 22 23:28:19 2002 UTC (21 years, 9 months ago) by deraadt
Branch: MAIN
CVS Tags: OPENBSD_3_3_BASE, OPENBSD_3_3, OPENBSD_3_2_BASE, OPENBSD_3_2 Changes since 1.33: +3 -3 lines
knf
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/* $OpenBSD: fileio.c,v 1.34 2002/08/22 23:28:19 deraadt Exp $ */
/*
* POSIX fileio.c
*/
#include "def.h"
static FILE *ffp;
#include <sys/types.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/dir.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
/*
* Open a file for reading.
*/
int
ffropen(const char *fn, BUFFER *bp)
{
struct stat statbuf;
if ((ffp = fopen(fn, "r")) == NULL)
return (FIOFNF);
if (bp && fstat(fileno(ffp), &statbuf) == 0) {
/* set highorder bit to make sure this isn't all zero */
bp->b_fi.fi_mode = statbuf.st_mode | 0x8000;
bp->b_fi.fi_uid = statbuf.st_uid;
bp->b_fi.fi_gid = statbuf.st_gid;
}
return (FIOSUC);
}
/*
* Open a file for writing.
* Return TRUE if all is well, and
* FALSE on error (cannot create).
*/
int
ffwopen(const char *fn, BUFFER *bp)
{
int fd;
mode_t mode = DEFFILEMODE;
if (bp && bp->b_fi.fi_mode)
mode = bp->b_fi.fi_mode & 07777;
fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, mode);
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.
* XXX - Should look at the status.
*/
/* ARGSUSED */
int
ffclose(BUFFER *bp)
{
(void) fclose(ffp);
return (FIOSUC);
}
/*
* Write a buffer to the already
* opened file. bp points to the
* buffer. Return the status.
* Check only at the newline and
* end of buffer.
*/
int
ffputbuf(BUFFER *bp)
{
char *cp;
char *cpend;
LINE *lp;
LINE *lpend;
lpend = bp->b_linep;
lp = lforw(lpend);
do {
cp = <ext(lp)[0]; /* begining of line */
cpend = &cp[llength(lp)]; /* end of line */
while (cp != cpend) {
putc(*cp, ffp);
cp++; /* putc may evaluate arguments
more than once */
}
lp = lforw(lp);
if (lp == lpend)
break; /* no implied \n on last line */
putc('\n', ffp);
} while (!ferror(ffp));
if (ferror(ffp)) {
ewprintf("Write I/O error");
return FIOERR;
}
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.
*/
int
ffgetline(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;
}
#ifndef NO_BACKUP
/*
* 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;
size_t nread;
char buf[BUFSIZ];
char *nname;
if (asprintf(&nname, "%s~", fn) == -1) {
ewprintf("Can't allocate temp file name : %s",
strerror(errno));
return (ABORT);
}
if (stat(fn, &sb) == -1) {
ewprintf("Can't stat %s : %s", fn, strerror(errno));
return (FALSE);
}
if ((from = open(fn, O_RDONLY)) == -1) {
free(nname);
return (FALSE);
}
to = open(nname, O_WRONLY|O_CREAT|O_TRUNC, (sb.st_mode & 0777));
if (to == -1) {
serrno = errno;
close(from);
free(nname);
errno = serrno;
return (FALSE);
}
while ((nread = read(from, buf, sizeof(buf))) > 0) {
if (write(to, buf, nread) != nread) {
nread = -1;
break;
}
}
serrno = errno;
close(from);
close(to);
if (nread == -1) {
if (unlink(nname) == -1)
ewprintf("Can't unlink temp : %s", strerror(errno));
}
free(nname);
errno = serrno;
return (nread == -1 ? FALSE : TRUE);
}
#endif
/*
* The string "fn" is a file name.
* Perform any required appending of directory name or case adjustments.
* If NO_DIR is not defined, the same file should be refered to even if the
* working directory changes.
*/
#ifdef SYMBLINK
#include <sys/types.h>
#include <sys/stat.h>
#ifndef MAXLINK
#define MAXLINK 8 /* maximum symbolic links to follow */
#endif
#endif
#include <pwd.h>
#ifndef NO_DIR
extern char *wdir;
#endif
char *
adjustname(const char *fn)
{
static char fnb[MAXPATHLEN];
const char *cp;
char user[LOGIN_NAME_MAX + 1], path[MAXPATHLEN];
int len;
path[0] = '\0';
/* first handle tilde expansion */
if (fn[0] == '~') {
struct passwd *pw;
cp = strchr(fn, '/');
if (cp == NULL)
cp = fn + strlen(fn); /* point to the NUL byte */
if ((cp - &fn[1]) > LOGIN_NAME_MAX) {
ewprintf("login name too long");
return (NULL);
}
if (cp == &fn[1]) /* ~/ */
strlcpy(user, getlogin(), sizeof user);
else
strlcpy(user, &fn[1], cp - &fn[1] + 1);
pw = getpwnam(user);
if (pw == NULL) {
ewprintf("unknown user %s", user);
return (NULL);
}
strlcpy(path, pw->pw_dir, sizeof path - 1);
len = strlen(path);
if (path[len] != '/') {
path[len] = '/';
path[len + 1] = '\0';
}
fn = cp;
if (*fn == '/')
fn++;
}
strlcat(path, fn, sizeof path);
return (realpath(path, fnb));
}
#ifndef NO_STARTUP
/*
* 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;
if ((home = getenv("HOME")) == NULL || *home == '\0')
goto nohome;
if (suffix == NULL) {
if (snprintf(file, sizeof(file), "%s/.mg", home)
>= sizeof(file))
return (NULL);
} else {
if (snprintf(file, sizeof(file), "%s/.mg-%s", home, suffix)
>= sizeof(file))
return (NULL);
}
if (access(file, R_OK) == 0)
return (file);
nohome:
#ifdef STARTUPFILE
if (suffix == NULL) {
if (snprintf(file, sizeof(file), "%s", STARTUPFILE)
>= sizeof(file))
return (NULL);
} else {
if (snprintf(file, sizeof(file), "%s%s", STARTUPFILE, suffix)
>= sizeof(file))
return (NULL);
}
if (access(file, R_OK) == 0)
return (file);
#endif
return (NULL);
}
#endif
#ifndef NO_DIRED
#include <sys/wait.h>
#include "kbd.h"
int
copy(char *frname, char *toname)
{
int ifd, ofd, n;
char buf[BUFSIZ];
mode_t mode = DEFFILEMODE; /* XXX?? */
struct stat orig;
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, mode)) == -1) {
close(ifd);
return (FALSE);
}
while ((n = read(ifd, buf, sizeof buf)) > 0) {
if (write(ofd, buf, n) != n) {
ewprintf("write error : %s", strerror(errno));
break;
}
}
if (fchmod(ofd, orig.st_mode) == -1)
ewprintf("Cannot set original mode : %s", strerror(errno));
if (n == -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);
}
/*
* dirname needs to have enough place to store an additional '/'.
*/
BUFFER *
dired_(char *dirname)
{
BUFFER *bp;
FILE *dirpipe;
char line[256];
int len;
if ((dirname = adjustname(dirname)) == NULL) {
ewprintf("Bad directory name");
return NULL;
}
/* this should not be done, instead adjustname() should get a flag */
len = strlen(dirname);
if (dirname[len - 1] != '/') {
dirname[len++] = '/';
dirname[len] = '\0';
}
if ((bp = findbuffer(dirname)) == NULL) {
ewprintf("Could not create buffer");
return NULL;
}
if (bclear(bp) != TRUE)
return FALSE;
bp->b_flag |= BFREADONLY;
if (snprintf(line, sizeof(line), "ls -al %s", dirname) >= sizeof(line)){
ewprintf("Path too long");
return NULL;
}
if ((dirpipe = popen(line, "r")) == NULL) {
ewprintf("Problem opening pipe to ls");
return NULL;
}
line[0] = line[1] = ' ';
while (fgets(&line[2], sizeof(line) - 2, dirpipe) != NULL) {
line[strlen(line) - 1] = '\0'; /* remove ^J */
(void) addline(bp, line);
}
if (pclose(dirpipe) == -1) {
ewprintf("Problem closing pipe to ls");
return NULL;
}
bp->b_dotp = lforw(bp->b_linep); /* go to first line */
(void) strlcpy(bp->b_fname, dirname, sizeof bp->b_fname);
if ((bp->b_modes[0] = name_mode("dired")) == NULL) {
bp->b_modes[0] = name_mode("fundamental");
ewprintf("Could not find mode dired");
return NULL;
}
bp->b_nmodes = 0;
return bp;
}
#define NAME_FIELD 8
int
d_makename(LINE *lp, char *fn, int len)
{
int i;
char *p, *np;
strlcpy(fn, curbp->b_fname, len);
p = lp->l_text;
for (i = 0; i < NAME_FIELD; i++) {
np = strpbrk(p, "\t ");
if (np == NULL)
return ABORT;
p = np + 1;
while (*p != '\0' && strchr("\t ", *p))
p++;
}
strlcat(fn, p, len);
return lgetc(lp, 2) == 'd';
}
#endif /* NO_DIRED */
struct filelist {
LIST fl_l;
char fl_name[NFILEN + 2];
};
/*
* return list of file names that match the name in buf.
*/
LIST *
make_file_list(char *buf)
{
char *dir, *file, *cp;
int len, preflen;
DIR *dirp;
struct dirent *dent;
LIST *last;
struct filelist *current;
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/.. as a reference to another directory, whereas we are
* interested in names starting with ..
*/
len = strlen(buf);
if (buf[len - 1] == '.') {
buf[len - 1] = 'x';
dir = adjustname(buf);
buf[len - 1] = '.';
} else
dir = adjustname(buf);
if (dir == NULL)
return (FALSE);
/*
* If the user typed a trailing / or the empty string
* he wants us to use his file spec as a directory name.
*/
if (buf[0] && buf[strlen(buf) - 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. */
strlcpy(prefixx, buf, sizeof prefixx);
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 + MAXNAMLEN) > NFILEN)
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 (dent->d_namlen < len || memcmp(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;
if (snprintf(statname, sizeof(statname), "%s/%s",
dir, dent->d_name) > sizeof(statname) - 1) {
continue;
}
if (stat(statname, &statbuf) < 0)
continue;
if (statbuf.st_mode & S_IFDIR)
isdir = 1;
}
current = malloc(sizeof(struct filelist));
if (current == NULL)
break;
if (snprintf(current->fl_name, sizeof(current->fl_name),
"%s%s%s", prefixx, dent->d_name, isdir ? "/" : "")
>= sizeof(current->fl_name)) {
free(current);
continue;
}
current->fl_l.l_next = last;
current->fl_l.l_name = current->fl_name;
last = (LIST *) current;
}
closedir(dirp);
return (last);
}