4.4BSD/usr/src/contrib/jove-4.14.6/io.c
/***************************************************************************
* This program is Copyright (C) 1986, 1987, 1988 by Jonathan Payne. JOVE *
* is provided to you without charge, and with no warranty. You may give *
* away copies of JOVE, including sources, provided that this notice is *
* included in all the files. *
***************************************************************************/
#include "jove.h"
#include "list.h"
#include "fp.h"
#include "termcap.h"
#include "ctype.h"
#include "disp.h"
#include "scandir.h"
#ifdef IPROCS
# include <signal.h>
#endif
#ifdef MAC
# include "mac.h"
#else
# include <sys/stat.h>
#endif
#ifdef UNIX
# include <sys/file.h>
#endif
#ifdef MSDOS
# include <fcntl.h>
# include <io.h>
# include <direct.h>
# include <dos.h>
#endif /* MSDOS */
#include <errno.h>
private struct block
*lookup proto((int /* promoted short */));
private char
#ifdef MSDOS
*fixpath proto((char *)),
#endif
*getblock proto((daddr, bool));
private bool
f_getputl proto((struct line *line,struct FileStruct *fp));
private void
#ifdef MSDOS
abspath proto((char *, char *)),
#endif
file_backup proto((char *fname));
#ifdef MSDOS
private int
Dchdir proto((char *));
#endif
long io_chars; /* number of chars in this open_file */
int io_lines; /* number of lines in this open_file */
#ifdef pdp11
char *iobuff,
*genbuf,
*linebuf;
#else
char iobuff[LBSIZE],
genbuf[LBSIZE],
linebuf[LBSIZE];
#endif
#ifdef BACKUPFILES
bool BkupOnWrite = OFF;
#endif
#ifndef MSDOS
#define Dchdir(to) chdir(to)
#else /* MSDOS */
private int /* chdir + drive */
Dchdir(to)
char *to;
{
unsigned d, dd, n;
if (to[1] == ':') {
d = CharUpcase(to[0]) - 'A';
/* ??? only 16 drives? */
if (d >= 16)
complain("invalid drive");
_dos_getdrive(&dd);
if (dd != d)
_dos_setdrive(d, &n);
if (to[2] == '\0') {
/* ??? Is this correct? DHR
* Current path on this drive might not be the root.
*/
return 0;
}
}
return chdir(to);
}
private char *
fixpath(p)
char *p;
{
char *pp = p;
while (*p) {
if (*p == '\\')
*p = '/';
p++;
}
return strlwr(pp);
}
private void
abspath(so, dest)
char *so, *dest;
{
char cwd[FILESIZE], cwdD[3], cwdDIR[FILESIZE], cwdF[9], cwdEXT[5],
soD[3], soDIR[FILESIZE], soF[9], soEXT[5];
char *drive, *path;
_splitpath(fixpath(so), soD, soDIR, soF, soEXT);
getcwd(cwd, FILESIZE);
if (*soD != '\0') {
Dchdir(soD); /* this is kinda messy */
getcwd(cwdDIR, FILESIZE); /* should probably just */
Dchdir(cwd); /* call DOS to do it */
strcpy(cwd, cwdDIR);
}
(void) fixpath(cwd);
if (cwd[strlen(cwd)-1] != '/')
strcat(cwd, "/x.x"); /* need dummy filename */
_splitpath(fixpath(cwd), cwdD, cwdDIR, cwdF, cwdEXT);
drive = (*soD == '\0') ? cwdD : soD;
if (*soDIR != '/')
path = strcat(cwdDIR, soDIR);
else
path = soDIR;
_makepath(dest, drive, path, soF, soEXT);
fixpath(dest); /* can't do it often enough */
}
#endif /* MSDOS */
void
close_file(fp)
File *fp;
{
if (fp) {
if (fp->f_flags & F_TELLALL)
add_mess(" %d lines, %D characters.",
io_lines,
io_chars);
f_close(fp);
}
}
/* Write the region from line1/char1 to line2/char2 to FP. This
never CLOSES the file since we don't know if we want to. */
bool EndWNewline = 1;
void
putreg(fp, line1, char1, line2, char2, makesure)
register File *fp;
Line *line1,
*line2;
int char1,
char2;
bool makesure;
{
register int c;
register char *lp;
if (makesure)
(void) fixorder(&line1, &char1, &line2, &char2);
while (line1 != line2->l_next) {
lp = lcontents(line1) + char1;
if (line1 == line2) {
fputnchar(lp, (char2 - char1), fp);
io_chars += (char2 - char1);
} else {
while ((c = *lp++) != '\0') {
jputc(c, fp);
io_chars += 1;
}
}
if (line1 != line2) {
io_lines += 1;
io_chars += 1;
#ifdef MSDOS
jputc('\r', fp);
#endif /* MSDOS */
jputc('\n', fp);
}
line1 = line1->l_next;
char1 = 0;
}
flushout(fp);
}
private void
dofread(fp)
register File *fp;
{
char end[LBSIZE];
bool xeof;
Line *savel = curline;
int savec = curchar;
strcpy(end, linebuf + curchar);
xeof = f_gets(fp, linebuf + curchar, (size_t) (LBSIZE - curchar));
SavLine(curline, linebuf);
while(!xeof) {
curline = listput(curbuf, curline);
xeof = f_getputl(curline, fp);
}
getDOT();
linecopy(linebuf, (curchar = strlen(linebuf)), end);
SavLine(curline, linebuf);
IFixMarks(savel, savec, curline, curchar);
}
void
read_file(file, is_insert)
char *file;
bool is_insert;
{
Bufpos save;
File *fp;
int rdonly;
if (!is_insert)
curbuf->b_ntbf = NO;
fp = open_file(file, iobuff, F_READ, NO, NO);
if (fp == NULL) {
if (!is_insert && errno == ENOENT)
s_mess("(new file)");
else
s_mess(IOerr("open", file));
return;
}
rdonly = (fp->f_flags & F_READONLY)? 1 : 0;
DOTsave(&save);
dofread(fp);
if (is_insert && io_chars > 0) {
modify();
set_mark();
}
SetDot(&save);
getDOT();
close_file(fp);
/* just guessing that if this is moved here */
/* then the bug on SunOS that seems to alter */
/* mtime under our feet will disappear */
if (!is_insert) {
set_ino(curbuf);
set_arg_value(rdonly);
TogMinor(ReadOnly);
}
}
void
SaveFile()
{
if (IsModified(curbuf)) {
if (curbuf->b_fname == NULL)
WriteFile();
else {
filemunge(curbuf->b_fname);
chk_mtime(curbuf, curbuf->b_fname, "save");
file_write(curbuf->b_fname, NO);
}
} else
message("No changes need to be written.");
}
char *HomeDir; /* home directory */
size_t HomeLen; /* length of home directory string */
private List *DirStack = NULL;
#define dir_name(dp) ((char *) list_data((dp)))
#define PWD_PTR (list_data(DirStack))
#define PWD ((char *) PWD_PTR)
char *
pwd()
{
return (char *) PWD_PTR;
}
char *
pr_name(fname, okay_home)
char *fname;
int okay_home;
{
int n;
if (fname != NULL) {
n = numcomp(fname, PWD);
if ((PWD[n] == '\0') && /* Matched to end of PWD */
(fname[n] == '/'))
return fname + n + 1;
if (okay_home && strcmp(HomeDir, "/") != 0
&& strncmp(fname, HomeDir, HomeLen) == 0
&& fname[HomeLen] == '/')
{
static char name_buf[100];
swritef(name_buf, sizeof(name_buf),
"~%s", fname + HomeLen);
return name_buf;
}
}
return fname;
}
void
Chdir()
{
char dirbuf[FILESIZE];
#ifdef MSDOS
fmask = 0x10;
#endif
(void) ask_file((char *)NULL, PWD, dirbuf);
#ifdef MSDOS
fmask = 0x13;
#endif
if (Dchdir(dirbuf) == -1)
{
s_mess("cd: cannot change into %s.", dirbuf);
return;
}
UpdModLine = YES;
setCWD(dirbuf);
prCWD();
#ifdef MAC
Bufchange = YES;
#endif
}
#ifdef UNIX
# ifndef BSD4_2
char *
getwd(buffer)
char *buffer;
{
Buffer *old = curbuf;
char *ret_val;
SetBuf(do_select((Window *)NULL, "pwd-output"));
curbuf->b_type = B_PROCESS;
(void) UnixToBuf("pwd-output", (char *)NULL, NO, 0, YES,
"/bin/pwd", (char *) NULL);
ToFirst();
strcpy(buffer, linebuf);
SetBuf(old);
return buffer;
}
# endif /* not BSD4_2 */
/* Check if dn is the name of the current working directory
and that it is in cannonical form */
bool
chkCWD(dn)
char *dn;
{
char filebuf[FILESIZE];
struct stat dnstat,
dotstat;
if (dn[0] != '/')
return FALSE; /* need absolute pathname */
PathParse(dn, filebuf);
return stat(filebuf, &dnstat) == 0 &&
stat(".", &dotstat) == 0 &&
dnstat.st_dev == dotstat.st_dev &&
dnstat.st_ino == dotstat.st_ino;
}
#endif /* UNIX */
void
setCWD(d)
char *d;
{
if (DirStack == NULL)
list_push(&DirStack, (UnivPtr)NULL);
PWD_PTR = (PWD == NULL)
? (UnivPtr) emalloc((size_t) (strlen(d) + 1))
: (UnivPtr) freealloc((UnivPtr) PWD, strlen(d) + 1);
strcpy(PWD, d);
}
void
getCWD()
{
char *cwd;
char pathname[FILESIZE];
#ifndef MSDOS
cwd = getenv("CWD");
if (cwd == NULL || !chkCWD(cwd)) {
cwd = getenv("PWD");
if (cwd == NULL || !chkCWD(cwd)) {
#ifdef HAVE_GETWD
cwd = getwd(pathname);
#else
/* System Vr4, and who else? */
extern char *getcwd proto((char *, int/*!!!*/));
cwd = getcwd(pathname, (int) sizeof(pathname));
#endif /* HAVE_GETWD */
}
}
#else /* MSDOS */
{
extern char *getcwd();
cwd = fixpath(getcwd(pathname, FILESIZE));
}
#endif /* MSDOS */
setCWD(cwd);
}
void
prDIRS()
{
register List *lp;
s_mess(": %f ");
for (lp = DirStack; lp != NULL; lp = list_next(lp))
add_mess("%s ", pr_name(dir_name(lp), YES));
}
void
prCWD()
{
s_mess(": %f => \"%s\"", PWD);
}
void
Pushd()
{
char *newdir,
dirbuf[FILESIZE];
#ifdef MSDOS
fmask = 0x10;
#endif
newdir = ask_file((char *)NULL, NullStr, dirbuf);
#ifdef MSDOS
fmask = 0x13;
#endif
UpdModLine = YES;
if (*newdir == '\0') { /* Wants to swap top two entries */
char *old_top;
if (list_next(DirStack) == NULL)
complain("pushd: no other directory.");
old_top = PWD;
list_data(DirStack) = (UnivPtr) dir_name(list_next(DirStack));
list_data(list_next(DirStack)) = (UnivPtr) old_top;
(void) Dchdir(PWD);
} else {
if (Dchdir(dirbuf) == -1)
{
s_mess("pushd: cannot change into %s.", dirbuf);
return;
}
(void) list_push(&DirStack, (UnivPtr)NULL);
setCWD(dirbuf);
}
prDIRS();
}
void
Popd()
{
if (list_next(DirStack) == NULL)
complain("popd: directory stack is empty.");
UpdModLine = YES;
free((UnivPtr) list_pop(&DirStack));
(void) Dchdir(PWD); /* If this doesn't work, we's in deep shit. */
prDIRS();
}
private void
dfollow(file, into)
char *file,
*into;
{
char *dp,
*sp;
#ifndef MSDOS
if (*file == '/') { /* Absolute pathname */
strcpy(into, "/");
file += 1;
} else {
strcpy(into, PWD);
}
#else /* MSDOS */
char filefix[FILESIZE];
abspath(file, filefix); /* convert to absolute pathname */
strcpy(into, filefix); /* and forget about drives */
into[3] = '\0';
into = &(into[2]);
file = &(filefix[3]);
#endif /* MSDOS */
dp = into + strlen(into);
for (;;) {
if (*file == '\0')
break;
if ((sp = strchr(file, '/')) != NULL)
*sp = '\0';
if (*file == '\0' || strcmp(file, ".") == 0) {
/* So it will get to the end of the loop */
} else if (strcmp(file, "..") == 0) {
for (;;) {
if (dp == into) {
*dp++ = '/';
break;
}
if (*--dp == '/')
break;
}
*dp = '\0';
} else {
if (dp!=into && dp[-1]!='/')
*dp++ = '/';
strcpy(dp, file);
dp += strlen(dp); /* stay at the end */
}
if (sp == NULL)
break;
file = sp + 1;
}
}
#ifdef UNIX
# ifdef YP_PASSWD
#include <pwd.h>
private void
get_hdir(user, buf)
register char *user,
*buf;
{
struct passwd *p;
p = getpwnam(user);
endpwent();
if (p == NULL) {
add_mess(" [unknown user: %s]", user);
SitFor(7);
complain((char *)NULL);
/* NOTREACHED */
}
strcpy(buf, p->pw_dir);
}
#else
#include "re.h"
private void
get_hdir(user, buf)
register char *user,
*buf;
{
char fbuf[LBSIZE],
pattern[100];
register int u_len;
File *fp;
u_len = strlen(user);
fp = open_file("/etc/passwd", fbuf, F_READ, YES, YES);
swritef(pattern, sizeof(pattern),
"%s:[^:]*:[^:]*:[^:]*:[^:]*:\\([^:]*\\):", user);
while (!f_gets(fp, genbuf, LBSIZE))
if ((strncmp(genbuf, user, u_len) == 0)
&& LookingAt(pattern, genbuf, 0)) {
putmatch(1, buf, FILESIZE);
close_file(fp);
return;
}
close_file(fp);
add_mess(" [unknown user: %s]", user);
SitFor(7);
complain((char *)NULL);
}
#endif /* YP_PASSWD */
#endif /* UNIX */
void
PathParse(name, intobuf)
char *name,
*intobuf;
{
char localbuf[FILESIZE];
intobuf[0] = localbuf[0] = '\0';
if (*name == '\0')
return;
if (*name == '~') {
if (name[1] == '/' || name[1] == '\0') {
strcpy(localbuf, HomeDir);
name += 1;
}
#ifdef UNIX /* may add for mac in future */
else {
char *uendp = strchr(name, '/'),
unamebuf[30];
if (uendp == NULL)
uendp = name + strlen(name);
name += 1;
null_ncpy(unamebuf, name, (size_t) (uendp - name));
get_hdir(unamebuf, localbuf);
name = uendp;
}
#endif
#ifndef MSDOS
} else if (*name == '\\') {
/* allow quoting of ~ (but \ is a path separator in MSDOS) */
name += 1;
#endif /* MSDOS */
}
(void) strcat(localbuf, name);
dfollow(localbuf, intobuf);
}
void
filemunge(newname)
char *newname;
{
struct stat stbuf;
if (newname == NULL)
return;
if (stat(newname, &stbuf))
return;
if (
#ifndef MSDOS
((stbuf.st_dev != curbuf->b_dev) ||
(stbuf.st_ino != curbuf->b_ino)) &&
#endif /* !MSDOS */
#ifndef MAC
((stbuf.st_mode & S_IFMT) != S_IFCHR) &&
#endif /* !MAC */
(curbuf->b_fname==NULL || strcmp(newname, curbuf->b_fname) != 0)) {
rbell();
confirm("\"%s\" already exists; overwrite it? ", newname);
}
}
int CreatMode = DFLT_MODE;
private void
DoWriteReg(app)
bool app;
{
char fnamebuf[FILESIZE],
*fname;
Mark *mp = CurMark();
File *fp;
/* Won't get here if there isn't a Mark */
fname = ask_file((char *)NULL, (char *)NULL, fnamebuf);
#ifdef BACKUPFILES
if (app == NO) {
filemunge(fname);
if (BkupOnWrite)
file_backup(fname);
}
#else
if (!app)
filemunge(fname);
#endif
fp = open_file(fname, iobuff, app ? F_APPEND : F_WRITE, YES, NO);
putreg(fp, mp->m_line, mp->m_char, curline, curchar, YES);
close_file(fp);
}
void
WrtReg()
{
DoWriteReg(NO);
}
void
AppReg()
{
DoWriteReg(YES);
}
bool OkayBadChars = NO;
void
WriteFile()
{
char *fname,
fnamebuf[FILESIZE];
#ifdef MAC
if (Macmode) {
if (!(fname = pfile(fnamebuf)))
return;
} else
#endif /* MAC */
fname = ask_file((char *)NULL, curbuf->b_fname, fnamebuf);
/* Don't allow bad characters when creating new files. */
if (!OkayBadChars
&& (curbuf->b_fname==NULL || strcmp(curbuf->b_fname, fnamebuf) != 0))
{
#ifdef UNIX
static const char badchars[] = "!$^&*()~`{}\"'\\|<>? ";
#endif /* UNIX */
#ifdef MSDOS
static const char badchars[] = "*|<>? ";
#endif /* MSDOS */
#ifdef MAC
static const char badchars[] = ":";
#endif /* MAC */
register char *cp = fnamebuf;
register int c;
while ((c = *cp++ & CHARMASK) != '\0') /* avoid sign extension... */
if (c < ' ' || c == '\177' || strchr(badchars, c))
complain("'%p': bad character in filename.", c);
}
chk_mtime(curbuf, fname, "write");
filemunge(fname);
curbuf->b_type = B_FILE; /* in case it wasn't before */
setfname(curbuf, fname);
file_write(fname, NO);
}
/* Open file FNAME supplying the buffer IO routine with buffer BUF.
HOW is F_READ, F_WRITE or F_APPEND. IFBAD == COMPLAIN means that
if we fail at opening the file, call complain. LOUDNESS says
whether or not to print the "reading ..." message on the message
line.
NOTE: This opens the pr_name(fname, NO) of fname. That is, FNAME
is usually an entire pathname, which can be slow when the
pathname is long and there are lots of symbolic links along
the way (which has become very common in my experience). So,
this speeds up opens file names in the local directory. It
will not speed up things like "../scm/foo.scm" simple because
by the time we get here that's already been expanded to an
absolute pathname. But this is a start.
*/
File *
open_file(fname, buf, how, complainifbad, quiet)
register char *fname;
char *buf;
register int how;
int complainifbad,
quiet;
{
register File *fp;
io_chars = 0;
io_lines = 0;
fp = f_open(pr_name(fname, NO), how, buf, LBSIZE);
if (fp == NULL) {
message(IOerr((how == F_READ) ? "open" : "create", fname));
if (complainifbad)
complain((char *)NULL);
} else {
int rd_only = FALSE;
#ifndef MAC
if (access(pr_name(fname, NO), W_OK) == -1 && errno != ENOENT) {
rd_only = TRUE;
fp->f_flags |= F_READONLY;
}
#endif
if (!quiet) {
fp->f_flags |= F_TELLALL;
f_mess("\"%s\"%s", pr_name(fname, YES),
rd_only ? " [Read only]" : NullStr);
}
}
return fp;
}
#ifndef MSDOS
/* Check to see if the file has been modified since it was
last written. If so, make sure they know what they're
doing.
I hate to use another stat(), but to use confirm we gotta
do this before we open the file.
NOTE: This stats FNAME after converting it to a path-relative
name. I can't see why this would cause a problem ...
*/
void
chk_mtime(thisbuf, fname, how)
Buffer *thisbuf;
char *fname,
*how;
{
struct stat stbuf;
Buffer *b;
static const char mesg[] = "Shall I go ahead and %s anyway? ";
if ((thisbuf->b_mtime != 0) && /* if we care ... */
((b = file_exists(fname)) != NULL) && /* we already have this file */
(b == thisbuf) && /* and it's the current buffer */
(stat(pr_name(fname, NO), &stbuf) != -1) && /* and we can stat it */
(stbuf.st_mtime != b->b_mtime)) { /* and there's trouble. */
rbell();
redisplay(); /* Ring that bell! */
TOstart("Warning", TRUE);
Typeout("\"%s\" now saved on disk is not what you last", pr_name(fname, YES));
Typeout("visited or saved. Probably someone else is editing");
Typeout("your file at the same time.");
if (how) {
Typeout("");
Typeout("Type \"y\" if I should %s, anyway.", how);
f_mess(mesg, how);
}
TOstop();
if (how)
confirm(mesg, how);
}
}
#endif /* !MSDOS */
void
file_write(fname, app)
char *fname;
bool app;
{
File *fp;
#ifdef BACKUPFILES
if (!app && BkupOnWrite)
file_backup(fname);
#endif
fp = open_file(fname, iobuff, app ? F_APPEND : F_WRITE, YES, NO);
if (EndWNewline) { /* Make sure file ends with a newLine */
Bufpos save;
DOTsave(&save);
ToLast();
if (length(curline)) /* Not a blank Line */
LineInsert(1);
SetDot(&save);
}
putreg(fp, curbuf->b_first, 0, curbuf->b_last, length(curbuf->b_last), NO);
close_file(fp);
set_ino(curbuf);
unmodify();
}
void
ReadFile()
{
Buffer *bp;
char *fname,
fnamebuf[FILESIZE];
int lineno;
#ifdef MAC
if (Macmode) {
if (!(fname = gfile(fnamebuf)))
return;
} else
#endif /* MAC */
fname = ask_file((char *)NULL, curbuf->b_fname, fnamebuf);
chk_mtime(curbuf, fname, "read");
if (IsModified(curbuf)) {
char *y_or_n;
int c;
for (;;) {
rbell();
y_or_n = ask(NullStr, "Shall I make your changes to \"%s\" permanent? ", curbuf->b_name);
c = CharUpcase(*y_or_n);
if (c == 'Y' || c == 'N')
break;
}
if (c == 'Y')
SaveFile();
}
if ((bp = file_exists(fnamebuf)) != NULL &&
(bp == curbuf))
lineno = pnt_line() - 1;
else
lineno = 0;
unmodify();
initlist(curbuf);
setfname(curbuf, fname);
read_file(fname, NO);
SetLine(next_line(curbuf->b_first, lineno));
}
void
InsFile()
{
char *fname,
fnamebuf[FILESIZE];
#ifdef MAC
if (Macmode) {
if (!(fname = gfile(fnamebuf)))
return;
} else
#endif /* MAC */
fname = ask_file((char *)NULL, curbuf->b_fname, fnamebuf);
read_file(fname, YES);
}
#include "temp.h"
bool DOLsave = NO; /* Do Lsave flag. If lines aren't being saved
when you think they should have been, this
flag is probably not being set, or is being
cleared before lsave() was called. */
private int nleft, /* number of good characters left in current block */
tmpfd = -1;
daddr DFree = 1; /* pointer to end of tmp file */
private char *tfname;
private void
tmpinit()
{
char buf[FILESIZE];
#ifdef MAC
swritef(buf, sizeof(buf), "%s/%s", HomeDir, d_tempfile);
#else
swritef(buf, sizeof(buf), "%s/%s", TmpFilePath, d_tempfile);
#endif
tfname = copystr(buf);
tfname = mktemp(tfname);
(void) close(creat(tfname, 0600));
#ifndef MSDOS
tmpfd = open(tfname, 2);
#else /* MSDOS */
tmpfd = open(tfname, 0x8002); /* MSDOS fix */
#endif /* MSDOS */
if (tmpfd == -1)
complain("Warning: cannot create tmp file! %s", strerror(errno));
}
/* Close tempfile before execing a child process.
* Since we might be vforking, we must not change any variables
* (in particular tmpfd).
*/
void
tmpclose()
{
if (tmpfd != -1)
(void) close(tmpfd);
}
/* Close and remove tempfile before exiting. */
void
tmpremove()
{
if (tmpfd != -1) {
tmpclose();
(void) unlink(tfname);
}
}
/* get a line at `tl' in the tmp file into `buf' which should be LBSIZE
long */
int Jr_Len; /* length of Just Read Line */
void
getline(addr, buf)
daddr addr;
register char *buf;
{
register char *bp,
*lp;
lp = buf;
bp = getblock(addr >> 1, FALSE);
do ; while ((*lp++ = *bp++) != '\0');
Jr_Len = (lp - buf) - 1;
}
/* Put `buf' and return the disk address */
daddr
putline(buf)
char *buf;
{
register char *bp,
*lp;
register int nl;
daddr free_ptr;
lp = buf;
free_ptr = DFree;
bp = getblock(free_ptr, TRUE);
nl = nleft;
free_ptr = blk_round(free_ptr);
while ((*bp = *lp++) != '\0') {
if (*bp++ == '\n') {
*--bp = '\0';
break;
}
if (--nl == 0) {
free_ptr = forward_block(free_ptr);
DFree = free_ptr;
bp = getblock(free_ptr, TRUE);
lp = buf; /* start over ... */
nl = nleft;
}
}
free_ptr = DFree;
DFree += (((lp - buf) + CH_SIZE - 1) / CH_SIZE);
/* (lp - buf) includes the null */
return (free_ptr << 1);
}
/* The theory is that critical section of code inside this procedure
will never cause a problem to occur. Basically, we need to ensure
that two blocks are in memory at the same time, but I think that
this can never screw up. */
#define lockblock(addr)
#define unlockblock(addr)
private bool
f_getputl(line, fp)
Line *line;
register File *fp;
{
register char *bp;
register int c,
nl,
room = LBSIZE-1;
daddr free_ptr;
char *base;
free_ptr = DFree;
base = bp = getblock(free_ptr, TRUE);
nl = nleft;
free_ptr = blk_round(free_ptr);
do {
/* We can't store NUL in our buffer, so ignore it.
* Of course, with a little ingenuity we could:
* NUL could be represented by \n!
*/
c = jgetc(fp);
if (c == '\0')
continue;
#ifdef MSDOS
if (c == '\r')
continue;
#endif /* MSDOS */
if (c == EOF || c == '\n')
break;
if (--nl == 0) {
char *newbp;
size_t nbytes;
lockblock(free_ptr);
DFree = free_ptr = forward_block(free_ptr);
nbytes = bp - base;
newbp = getblock(free_ptr, TRUE);
nl = nleft;
byte_copy(base, newbp, nbytes);
bp = newbp + nbytes;
base = newbp;
unlockblock(free_ptr);
}
*bp++ = c;
} while (--room > 0);
*bp++ = '\0';
free_ptr = DFree;
DFree += (((bp - base) + CH_SIZE - 1) / CH_SIZE);
line->l_dline = (free_ptr << 1);
if (room == 0) {
add_mess(" [Line too long]");
rbell();
return YES;
}
if (c == EOF) {
if (--bp != base)
add_mess(" [Incomplete last line]");
return YES;
}
io_lines += 1;
return NO;
}
typedef struct block {
char b_dirty; /* (bool) */
short b_bno;
char b_buf[JBUFSIZ];
struct block
*b_LRUnext,
*b_LRUprev,
*b_HASHnext;
} Block;
#define HASHSIZE 7 /* Primes work best (so I'm told) */
#define B_HASH(bno) ((bno) % HASHSIZE)
#ifdef MAC
private Block *b_cache,
#else
private Block b_cache[NBUF],
#endif
*bht[HASHSIZE], /* Block hash table. Must be zero initially */
*f_block = NULL,
*l_block = NULL;
private int max_bno = -1,
NBlocks;
private void (*blkio) ptrproto((Block *, int (*) ptrproto((int, UnivPtr, size_t))));
#ifdef MAC
public bool
make_cache() /* Only 32K of static space on Mac, so... */
{
return (b_cache = (Block *) calloc(NBUF,sizeof(Block))) != NULL;
}
#endif /* MAC */
private void
real_blkio(b, iofcn)
register Block *b;
register int (*iofcn) ptrproto((int, UnivPtr, size_t));
{
(void) lseek(tmpfd, (long) ((unsigned) b->b_bno) * JBUFSIZ, 0);
if ((*iofcn)(tmpfd, (UnivPtr) b->b_buf, (size_t)JBUFSIZ) != JBUFSIZ)
error("[Tmp file %s error: to continue editing would be dangerous]",
(iofcn == read) ? "READ" : "WRITE");
}
private void
fake_blkio(b, iofcn)
register Block *b;
register int (*iofcn) ptrproto((int, UnivPtr, size_t));
{
tmpinit();
blkio = real_blkio;
real_blkio(b, iofcn);
}
void
d_cache_init()
{
register Block *bp, /* Block pointer */
**hp; /* Hash pointer */
register short bno;
for (bp = b_cache, bno = NBUF; --bno >= 0; bp++) {
NBlocks += 1;
bp->b_dirty = NO;
bp->b_bno = bno;
if (l_block == NULL)
l_block = bp;
bp->b_LRUprev = NULL;
bp->b_LRUnext = f_block;
if (f_block != NULL)
f_block->b_LRUprev = bp;
f_block = bp;
bp->b_HASHnext = *(hp = &bht[B_HASH(bno)]);
*hp = bp;
}
blkio = fake_blkio;
}
void
SyncTmp()
{
register Block *b;
#ifdef IBMPC
register int bno = 0;
/* sync the blocks in order, for file systems that don't allow
holes (MSDOS). Perhaps this benefits floppy-based file systems. */
for (bno = 0; bno <= max_bno; ) {
if ((b = lookup(bno++)) && b->b_dirty) {
(*blkio)(b, write);
b->b_dirty = NO;
}
}
#else
for (b = f_block; b != NULL; b = b->b_LRUnext)
if (b->b_dirty) {
(*blkio)(b, (int (*) ptrproto((int, UnivPtr, size_t)))write);
b->b_dirty = NO;
}
#endif
}
private Block *
lookup(bno)
register short bno;
{
register Block *bp;
for (bp = bht[B_HASH(bno)]; bp != NULL; bp = bp->b_HASHnext)
if (bp->b_bno == bno)
break;
return bp;
}
private void
LRUunlink(b)
register Block *b;
{
if (b->b_LRUprev == NULL)
f_block = b->b_LRUnext;
else
b->b_LRUprev->b_LRUnext = b->b_LRUnext;
if (b->b_LRUnext == NULL)
l_block = b->b_LRUprev;
else
b->b_LRUnext->b_LRUprev = b->b_LRUprev;
}
private Block *
b_unlink(bp)
register Block *bp;
{
register Block *hp,
*prev = NULL;
LRUunlink(bp);
/* Now that we have the block, we remove it from its position
in the hash table, so we can THEN put it somewhere else with
it's new block assignment. */
for (hp = bht[B_HASH(bp->b_bno)]; hp != NULL; prev = hp, hp = hp->b_HASHnext)
if (hp == bp)
break;
if (hp == NULL) {
writef("\rBlock %d missing!", bp->b_bno);
finish(0);
}
if (prev)
prev->b_HASHnext = hp->b_HASHnext;
else
bht[B_HASH(bp->b_bno)] = hp->b_HASHnext;
if (bp->b_dirty) { /* do, now, the delayed write */
(*blkio)(bp, (int (*) ptrproto((int, UnivPtr, size_t)))write);
bp->b_dirty = NO;
}
return bp;
}
/* Get a block which contains at least part of the line with the address
atl. Returns a pointer to the block and sets the global variable
nleft (number of good characters left in the buffer). */
private char *
getblock(atl, IsWrite)
daddr atl;
bool IsWrite;
{
register int bno,
off;
register Block *bp;
static Block *lastb = NULL;
bno = da_to_bno(atl);
off = da_to_off(atl);
if (da_too_huge(atl))
error("Tmp file too large. Get help!");
nleft = JBUFSIZ - off;
if (lastb != NULL && lastb->b_bno == bno) {
lastb->b_dirty |= IsWrite;
return lastb->b_buf + off;
}
/* The requested block already lives in memory, so we move
it to the end of the LRU list (making it Most Recently Used)
and then return a pointer to it. */
if ((bp = lookup(bno)) != NULL) {
if (bp != l_block) {
LRUunlink(bp);
if (l_block == NULL)
f_block = l_block = bp;
else
l_block->b_LRUnext = bp;
bp->b_LRUprev = l_block;
l_block = bp;
bp->b_LRUnext = NULL;
}
if (bp->b_bno > max_bno)
max_bno = bp->b_bno;
bp->b_dirty |= IsWrite;
lastb = bp;
return bp->b_buf + off;
}
/* The block we want doesn't reside in memory so we take the
least recently used clean block (if there is one) and use
it. */
bp = f_block;
if (bp->b_dirty) /* The best block is dirty ... */
SyncTmp();
bp = b_unlink(bp);
if (l_block == NULL)
l_block = f_block = bp;
else
l_block->b_LRUnext = bp; /* Place it at the end ... */
bp->b_LRUprev = l_block;
l_block = bp;
bp->b_LRUnext = NULL; /* so it's Most Recently Used */
bp->b_dirty = IsWrite;
bp->b_bno = bno;
bp->b_HASHnext = bht[B_HASH(bno)];
bht[B_HASH(bno)] = bp;
/* Get the current contents of the block UNLESS this is a new
block that's never been looked at before, i.e., it's past
the end of the tmp file. */
if (bp->b_bno <= max_bno)
(*blkio)(bp, read);
else
max_bno = bno;
lastb = bp;
return bp->b_buf + off;
}
char *
lbptr(line)
Line *line;
{
return getblock(line->l_dline >> 1, FALSE);
}
/* save the current contents of linebuf, if it has changed */
void
lsave()
{
if (curbuf == NULL || !DOLsave) /* Nothing modified recently */
return;
if (strcmp(lbptr(curline), linebuf) != 0)
SavLine(curline, linebuf); /* Put linebuf on the disk. */
DOLsave = NO;
}
#ifdef BACKUPFILES
private void
file_backup(fname)
char *fname;
{
#ifndef MSDOS
char *s;
register int i;
int fd1,
fd2;
char tmp1[JBUFSIZ],
tmp2[JBUFSIZ];
struct stat buf;
int mode;
strcpy(tmp1, fname);
if ((s = strrchr(tmp1, '/')) == NULL)
swritef(tmp2, sizeof(tmp2), "#%s~", fname);
else {
*s++ = '\0';
swritef(tmp2, sizeof(tmp2), "%s/#%s~", tmp1, s);
}
if ((fd1 = open(fname, 0)) < 0)
return;
/* create backup file with same mode as input file */
#ifndef MAC
if (fstat(fd1, &buf) != 0)
mode = CreatMode;
else
#endif
mode = buf.st_mode;
if ((fd2 = creat(tmp2, mode)) < 0) {
(void) close(fd1);
return;
}
while ((i = read(fd1, (UnivPtr) tmp1, sizeof(tmp1))) > 0)
write(fd2, (UnivPtr) tmp1, (size_t) i);
#ifdef BSD4_2
(void) fsync(fd2);
#endif
(void) close(fd2);
(void) close(fd1);
#else /* MSDOS */
char *dot,
*slash,
tmp[FILESIZE];
strcpy(tmp, fname);
slash = basename(tmp);
if (dot = strrchr(slash, '.')) {
if (!stricmp(dot,".bak"))
return;
*dot = '\0';
}
strcat(tmp, ".bak");
unlink(tmp);
rename(fname, tmp);
#endif /* MSDOS */
}
#endif