1408 lines
30 KiB
C
1408 lines
30 KiB
C
/* $OpenBSD: history.c,v 1.36 2008/05/20 00:30:30 fgsch Exp $ */
|
||
/* $OpenBSD: trap.c,v 1.22 2005/03/30 17:16:37 deraadt Exp $ */
|
||
|
||
#include "sh.h"
|
||
|
||
__RCSID("$MirOS: src/bin/mksh/histrap.c,v 1.67 2008/07/12 17:16:03 tg Exp $");
|
||
|
||
/*-
|
||
* MirOS: This is the default mapping type, and need not be specified.
|
||
* IRIX doesn’t have this constant.
|
||
*/
|
||
#ifndef MAP_FILE
|
||
#define MAP_FILE 0
|
||
#endif
|
||
|
||
Trap sigtraps[NSIG + 1];
|
||
static struct sigaction Sigact_ign;
|
||
|
||
#if HAVE_PERSISTENT_HISTORY
|
||
static int hist_count_lines(unsigned char *, int);
|
||
static int hist_shrink(unsigned char *, int);
|
||
static unsigned char *hist_skip_back(unsigned char *,int *,int);
|
||
static void histload(Source *, unsigned char *, int);
|
||
static void histinsert(Source *, int, const char *);
|
||
static void writehistfile(int, char *);
|
||
static int sprinkle(int);
|
||
#endif
|
||
|
||
static int hist_execute(char *);
|
||
static int hist_replace(char **, const char *, const char *, int);
|
||
static char **hist_get(const char *, int, int);
|
||
static char **hist_get_oldest(void);
|
||
static void histbackup(void);
|
||
|
||
static char **current; /* current position in history[] */
|
||
static int hstarted; /* set after hist_init() called */
|
||
static Source *hist_source;
|
||
|
||
#if HAVE_PERSISTENT_HISTORY
|
||
static char *hname; /* current name of history file */
|
||
static int histfd;
|
||
static int hsize;
|
||
#endif
|
||
|
||
int
|
||
c_fc(const char **wp)
|
||
{
|
||
struct shf *shf;
|
||
struct temp *tf;
|
||
const char *p;
|
||
char *editor = NULL;
|
||
int gflag = 0, lflag = 0, nflag = 0, sflag = 0, rflag = 0;
|
||
int optc;
|
||
const char *first = NULL, *last = NULL;
|
||
char **hfirst, **hlast, **hp;
|
||
|
||
if (!Flag(FTALKING_I)) {
|
||
bi_errorf("history functions not available");
|
||
return 1;
|
||
}
|
||
|
||
while ((optc = ksh_getopt(wp, &builtin_opt,
|
||
"e:glnrs0,1,2,3,4,5,6,7,8,9,")) != -1)
|
||
switch (optc) {
|
||
case 'e':
|
||
p = builtin_opt.optarg;
|
||
if (ksh_isdash(p))
|
||
sflag++;
|
||
else {
|
||
size_t len = strlen(p);
|
||
editor = alloc(len + 4, ATEMP);
|
||
memcpy(editor, p, len);
|
||
memcpy(editor + len, " $_", 4);
|
||
}
|
||
break;
|
||
case 'g': /* non-at&t ksh */
|
||
gflag++;
|
||
break;
|
||
case 'l':
|
||
lflag++;
|
||
break;
|
||
case 'n':
|
||
nflag++;
|
||
break;
|
||
case 'r':
|
||
rflag++;
|
||
break;
|
||
case 's': /* posix version of -e - */
|
||
sflag++;
|
||
break;
|
||
/* kludge city - accept -num as -- -num (kind of) */
|
||
case '0': case '1': case '2': case '3': case '4':
|
||
case '5': case '6': case '7': case '8': case '9':
|
||
p = shf_smprintf("-%c%s",
|
||
optc, builtin_opt.optarg);
|
||
if (!first)
|
||
first = p;
|
||
else if (!last)
|
||
last = p;
|
||
else {
|
||
bi_errorf("too many arguments");
|
||
return 1;
|
||
}
|
||
break;
|
||
case '?':
|
||
return 1;
|
||
}
|
||
wp += builtin_opt.optind;
|
||
|
||
/* Substitute and execute command */
|
||
if (sflag) {
|
||
char *pat = NULL, *rep = NULL;
|
||
|
||
if (editor || lflag || nflag || rflag) {
|
||
bi_errorf("can't use -e, -l, -n, -r with -s (-e -)");
|
||
return 1;
|
||
}
|
||
|
||
/* Check for pattern replacement argument */
|
||
if (*wp && **wp && (p = cstrchr(*wp + 1, '='))) {
|
||
pat = str_save(*wp, ATEMP);
|
||
rep = pat + (p - *wp);
|
||
*rep++ = '\0';
|
||
wp++;
|
||
}
|
||
/* Check for search prefix */
|
||
if (!first && (first = *wp))
|
||
wp++;
|
||
if (last || *wp) {
|
||
bi_errorf("too many arguments");
|
||
return 1;
|
||
}
|
||
|
||
hp = first ? hist_get(first, false, false) :
|
||
hist_get_newest(false);
|
||
if (!hp)
|
||
return 1;
|
||
return hist_replace(hp, pat, rep, gflag);
|
||
}
|
||
|
||
if (editor && (lflag || nflag)) {
|
||
bi_errorf("can't use -l, -n with -e");
|
||
return 1;
|
||
}
|
||
|
||
if (!first && (first = *wp))
|
||
wp++;
|
||
if (!last && (last = *wp))
|
||
wp++;
|
||
if (*wp) {
|
||
bi_errorf("too many arguments");
|
||
return 1;
|
||
}
|
||
if (!first) {
|
||
hfirst = lflag ? hist_get("-16", true, true) :
|
||
hist_get_newest(false);
|
||
if (!hfirst)
|
||
return 1;
|
||
/* can't fail if hfirst didn't fail */
|
||
hlast = hist_get_newest(false);
|
||
} else {
|
||
/* POSIX says not an error if first/last out of bounds
|
||
* when range is specified; at&t ksh and pdksh allow out of
|
||
* bounds for -l as well.
|
||
*/
|
||
hfirst = hist_get(first, (lflag || last) ? true : false,
|
||
lflag ? true : false);
|
||
if (!hfirst)
|
||
return 1;
|
||
hlast = last ? hist_get(last, true, lflag ? true : false) :
|
||
(lflag ? hist_get_newest(false) : hfirst);
|
||
if (!hlast)
|
||
return 1;
|
||
}
|
||
if (hfirst > hlast) {
|
||
char **temp;
|
||
|
||
temp = hfirst; hfirst = hlast; hlast = temp;
|
||
rflag = !rflag; /* POSIX */
|
||
}
|
||
|
||
/* List history */
|
||
if (lflag) {
|
||
char *s, *t;
|
||
|
||
for (hp = rflag ? hlast : hfirst;
|
||
hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1) {
|
||
if (!nflag)
|
||
shf_fprintf(shl_stdout, "%d",
|
||
hist_source->line - (int)(histptr - hp));
|
||
shf_putc('\t', shl_stdout);
|
||
/* print multi-line commands correctly */
|
||
s = *hp;
|
||
while ((t = strchr(s, '\n'))) {
|
||
*t = '\0';
|
||
shf_fprintf(shl_stdout, "%s\n\t", s);
|
||
*t++ = '\n';
|
||
s = t;
|
||
}
|
||
shf_fprintf(shl_stdout, "%s\n", s);
|
||
}
|
||
shf_flush(shl_stdout);
|
||
return 0;
|
||
}
|
||
|
||
/* Run editor on selected lines, then run resulting commands */
|
||
|
||
tf = maketemp(ATEMP, TT_HIST_EDIT, &e->temps);
|
||
if (!(shf = tf->shf)) {
|
||
bi_errorf("cannot create temp file %s - %s",
|
||
tf->name, strerror(errno));
|
||
return 1;
|
||
}
|
||
for (hp = rflag ? hlast : hfirst;
|
||
hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1)
|
||
shf_fprintf(shf, "%s\n", *hp);
|
||
if (shf_close(shf) == EOF) {
|
||
bi_errorf("error writing temporary file - %s", strerror(errno));
|
||
return 1;
|
||
}
|
||
|
||
/* Ignore setstr errors here (arbitrary) */
|
||
setstr(local("_", false), tf->name, KSH_RETURN_ERROR);
|
||
|
||
/* XXX: source should not get trashed by this.. */
|
||
{
|
||
Source *sold = source;
|
||
int ret;
|
||
|
||
ret = command(editor ? editor : "${FCEDIT:-/bin/ed} $_");
|
||
source = sold;
|
||
if (ret)
|
||
return ret;
|
||
}
|
||
|
||
{
|
||
struct stat statb;
|
||
XString xs;
|
||
char *xp;
|
||
int n;
|
||
|
||
if (!(shf = shf_open(tf->name, O_RDONLY, 0, 0))) {
|
||
bi_errorf("cannot open temp file %s", tf->name);
|
||
return 1;
|
||
}
|
||
|
||
n = stat(tf->name, &statb) < 0 ? 128 : statb.st_size + 1;
|
||
Xinit(xs, xp, n, hist_source->areap);
|
||
while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) {
|
||
xp += n;
|
||
if (Xnleft(xs, xp) <= 0)
|
||
XcheckN(xs, xp, Xlength(xs, xp));
|
||
}
|
||
if (n < 0) {
|
||
bi_errorf("error reading temp file %s - %s",
|
||
tf->name, strerror(shf_errno(shf)));
|
||
shf_close(shf);
|
||
return 1;
|
||
}
|
||
shf_close(shf);
|
||
*xp = '\0';
|
||
strip_nuls(Xstring(xs, xp), Xlength(xs, xp));
|
||
return hist_execute(Xstring(xs, xp));
|
||
}
|
||
}
|
||
|
||
/* Save cmd in history, execute cmd (cmd gets trashed) */
|
||
static int
|
||
hist_execute(char *cmd)
|
||
{
|
||
Source *sold;
|
||
int ret;
|
||
char *p, *q;
|
||
|
||
histbackup();
|
||
|
||
for (p = cmd; p; p = q) {
|
||
if ((q = strchr(p, '\n'))) {
|
||
*q++ = '\0'; /* kill the newline */
|
||
if (!*q) /* ignore trailing newline */
|
||
q = NULL;
|
||
}
|
||
histsave(++(hist_source->line), p, 1);
|
||
|
||
shellf("%s\n", p); /* POSIX doesn't say this is done... */
|
||
if ((p = q)) /* restore \n (trailing \n not restored) */
|
||
q[-1] = '\n';
|
||
}
|
||
|
||
/* Commands are executed here instead of pushing them onto the
|
||
* input 'cause posix says the redirection and variable assignments
|
||
* in
|
||
* X=y fc -e - 42 2> /dev/null
|
||
* are to effect the repeated commands environment.
|
||
*/
|
||
/* XXX: source should not get trashed by this.. */
|
||
sold = source;
|
||
ret = command(cmd);
|
||
source = sold;
|
||
return ret;
|
||
}
|
||
|
||
static int
|
||
hist_replace(char **hp, const char *pat, const char *rep, int globr)
|
||
{
|
||
char *line;
|
||
|
||
if (!pat)
|
||
line = str_save(*hp, ATEMP);
|
||
else {
|
||
char *s, *s1;
|
||
int pat_len = strlen(pat);
|
||
int rep_len = strlen(rep);
|
||
int len;
|
||
XString xs;
|
||
char *xp;
|
||
int any_subst = 0;
|
||
|
||
Xinit(xs, xp, 128, ATEMP);
|
||
for (s = *hp; (s1 = strstr(s, pat)) && (!any_subst || globr);
|
||
s = s1 + pat_len) {
|
||
any_subst = 1;
|
||
len = s1 - s;
|
||
XcheckN(xs, xp, len + rep_len);
|
||
memcpy(xp, s, len); /* first part */
|
||
xp += len;
|
||
memcpy(xp, rep, rep_len); /* replacement */
|
||
xp += rep_len;
|
||
}
|
||
if (!any_subst) {
|
||
bi_errorf("substitution failed");
|
||
return 1;
|
||
}
|
||
len = strlen(s) + 1;
|
||
XcheckN(xs, xp, len);
|
||
memcpy(xp, s, len);
|
||
xp += len;
|
||
line = Xclose(xs, xp);
|
||
}
|
||
return hist_execute(line);
|
||
}
|
||
|
||
/*
|
||
* get pointer to history given pattern
|
||
* pattern is a number or string
|
||
*/
|
||
static char **
|
||
hist_get(const char *str, int approx, int allow_cur)
|
||
{
|
||
char **hp = NULL;
|
||
int n;
|
||
|
||
if (getn(str, &n)) {
|
||
hp = histptr + (n < 0 ? n : (n - hist_source->line));
|
||
if ((ptrdiff_t)hp < (ptrdiff_t)history) {
|
||
if (approx)
|
||
hp = hist_get_oldest();
|
||
else {
|
||
bi_errorf("%s: not in history", str);
|
||
hp = NULL;
|
||
}
|
||
} else if ((ptrdiff_t)hp > (ptrdiff_t)histptr) {
|
||
if (approx)
|
||
hp = hist_get_newest(allow_cur);
|
||
else {
|
||
bi_errorf("%s: not in history", str);
|
||
hp = NULL;
|
||
}
|
||
} else if (!allow_cur && hp == histptr) {
|
||
bi_errorf("%s: invalid range", str);
|
||
hp = NULL;
|
||
}
|
||
} else {
|
||
int anchored = *str == '?' ? (++str, 0) : 1;
|
||
|
||
/* the -1 is to avoid the current fc command */
|
||
if ((n = findhist(histptr - history - 1, 0, str, anchored)) < 0)
|
||
bi_errorf("%s: not in history", str);
|
||
else
|
||
hp = &history[n];
|
||
}
|
||
return hp;
|
||
}
|
||
|
||
/* Return a pointer to the newest command in the history */
|
||
char **
|
||
hist_get_newest(int allow_cur)
|
||
{
|
||
if (histptr < history || (!allow_cur && histptr == history)) {
|
||
bi_errorf("no history (yet)");
|
||
return NULL;
|
||
}
|
||
return (allow_cur ? histptr : histptr - 1);
|
||
}
|
||
|
||
/* Return a pointer to the newest command in the history */
|
||
static char **
|
||
hist_get_oldest(void)
|
||
{
|
||
if (histptr <= history) {
|
||
bi_errorf("no history (yet)");
|
||
return NULL;
|
||
}
|
||
return history;
|
||
}
|
||
|
||
/******************************/
|
||
/* Back up over last histsave */
|
||
/******************************/
|
||
static void
|
||
histbackup(void)
|
||
{
|
||
static int last_line = -1;
|
||
|
||
if (histptr >= history && last_line != hist_source->line) {
|
||
hist_source->line--;
|
||
afree((void*)*histptr, APERM);
|
||
histptr--;
|
||
last_line = hist_source->line;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Return the current position.
|
||
*/
|
||
char **
|
||
histpos(void)
|
||
{
|
||
return current;
|
||
}
|
||
|
||
int
|
||
histnum(int n)
|
||
{
|
||
int last = histptr - history;
|
||
|
||
if (n < 0 || n >= last) {
|
||
current = histptr;
|
||
return last;
|
||
} else {
|
||
current = &history[n];
|
||
return n;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* This will become unnecessary if hist_get is modified to allow
|
||
* searching from positions other than the end, and in either
|
||
* direction.
|
||
*/
|
||
int
|
||
findhist(int start, int fwd, const char *str, int anchored)
|
||
{
|
||
char **hp;
|
||
int maxhist = histptr - history;
|
||
int incr = fwd ? 1 : -1;
|
||
int len = strlen(str);
|
||
|
||
if (start < 0 || start >= maxhist)
|
||
start = maxhist;
|
||
|
||
hp = &history[start];
|
||
for (; hp >= history && hp <= histptr; hp += incr)
|
||
if ((anchored && strncmp(*hp, str, len) == 0) ||
|
||
(!anchored && strstr(*hp, str)))
|
||
return hp - history;
|
||
|
||
return -1;
|
||
}
|
||
|
||
int
|
||
findhistrel(const char *str)
|
||
{
|
||
int maxhist = histptr - history;
|
||
int start = maxhist - 1;
|
||
int rec;
|
||
|
||
getn(str, &rec);
|
||
if (rec == 0)
|
||
return -1;
|
||
if (rec > 0) {
|
||
if (rec > maxhist)
|
||
return -1;
|
||
return rec - 1;
|
||
}
|
||
if (rec > maxhist)
|
||
return -1;
|
||
return start + rec + 1;
|
||
}
|
||
|
||
/*
|
||
* set history
|
||
* this means reallocating the dataspace
|
||
*/
|
||
void
|
||
sethistsize(int n)
|
||
{
|
||
if (n > 0 && n != histsize) {
|
||
int cursize = histptr - history;
|
||
|
||
/* save most recent history */
|
||
if (n < cursize) {
|
||
memmove(history, histptr - n, n * sizeof(char *));
|
||
cursize = n;
|
||
}
|
||
|
||
history = (char **)aresize(history, n*sizeof(char *), APERM);
|
||
|
||
histsize = n;
|
||
histptr = history + cursize;
|
||
}
|
||
}
|
||
|
||
#if HAVE_PERSISTENT_HISTORY
|
||
/*
|
||
* set history file
|
||
* This can mean reloading/resetting/starting history file
|
||
* maintenance
|
||
*/
|
||
void
|
||
sethistfile(const char *name)
|
||
{
|
||
/* if not started then nothing to do */
|
||
if (hstarted == 0)
|
||
return;
|
||
|
||
/* if the name is the same as the name we have */
|
||
if (hname && strcmp(hname, name) == 0)
|
||
return;
|
||
|
||
/*
|
||
* its a new name - possibly
|
||
*/
|
||
if (histfd) {
|
||
/* yes the file is open */
|
||
(void) close(histfd);
|
||
histfd = 0;
|
||
hsize = 0;
|
||
afree(hname, APERM);
|
||
hname = NULL;
|
||
/* let's reset the history */
|
||
histptr = history - 1;
|
||
hist_source->line = 0;
|
||
}
|
||
|
||
hist_init(hist_source);
|
||
}
|
||
#endif
|
||
|
||
/*
|
||
* initialise the history vector
|
||
*/
|
||
void
|
||
init_histvec(void)
|
||
{
|
||
if (history == (char **)NULL) {
|
||
histsize = HISTORYSIZE;
|
||
history = (char **)alloc(histsize * sizeof (char *), APERM);
|
||
histptr = history - 1;
|
||
}
|
||
}
|
||
|
||
|
||
/*
|
||
* Routines added by Peter Collinson BSDI(Europe)/Hillside Systems to
|
||
* a) permit HISTSIZE to control number of lines of history stored
|
||
* b) maintain a physical history file
|
||
*
|
||
* It turns out that there is a lot of ghastly hackery here
|
||
*/
|
||
|
||
|
||
/*
|
||
* save command in history
|
||
*/
|
||
void
|
||
histsave(int lno __unused, const char *cmd, int dowrite __unused)
|
||
{
|
||
char **hp;
|
||
char *c, *cp;
|
||
|
||
c = str_save(cmd, APERM);
|
||
if ((cp = strchr(c, '\n')) != NULL)
|
||
*cp = '\0';
|
||
|
||
#if HAVE_PERSISTENT_HISTORY
|
||
if (histfd && dowrite)
|
||
writehistfile(lno, c);
|
||
#endif
|
||
|
||
hp = histptr;
|
||
|
||
if (++hp >= history + histsize) { /* remove oldest command */
|
||
afree((void*)*history, APERM);
|
||
for (hp = history; hp < history + histsize - 1; hp++)
|
||
hp[0] = hp[1];
|
||
}
|
||
*hp = c;
|
||
histptr = hp;
|
||
}
|
||
|
||
/*
|
||
* Write history data to a file nominated by HISTFILE
|
||
* if HISTFILE is unset then history still happens, but
|
||
* the data is not written to a file
|
||
* All copies of ksh looking at the file will maintain the
|
||
* same history. This is ksh behaviour.
|
||
*
|
||
* This stuff uses mmap()
|
||
* if your system ain't got it - then you'll have to undef HISTORYFILE
|
||
*/
|
||
|
||
/*
|
||
* Open a history file
|
||
* Format is:
|
||
* Bytes 1, 2: HMAGIC - just to check that we are dealing with
|
||
* the correct object
|
||
* Then follows a number of stored commands
|
||
* Each command is
|
||
* <command byte><command number(4 bytes)><bytes><null>
|
||
*/
|
||
#define HMAGIC1 0xab
|
||
#define HMAGIC2 0xcd
|
||
#define COMMAND 0xff
|
||
|
||
void
|
||
hist_init(Source *s)
|
||
{
|
||
#if HAVE_PERSISTENT_HISTORY
|
||
unsigned char *base;
|
||
int lines;
|
||
int fd;
|
||
#endif
|
||
|
||
if (Flag(FTALKING) == 0)
|
||
return;
|
||
|
||
hstarted = 1;
|
||
|
||
hist_source = s;
|
||
|
||
#if HAVE_PERSISTENT_HISTORY
|
||
if ((hname = str_val(global("HISTFILE"))) == NULL)
|
||
return;
|
||
hname = str_save(hname, APERM);
|
||
|
||
retry:
|
||
/* we have a file and are interactive */
|
||
if ((fd = open(hname, O_RDWR|O_CREAT|O_APPEND, 0600)) < 0)
|
||
return;
|
||
|
||
histfd = savefd(fd);
|
||
if (histfd != fd)
|
||
close(fd);
|
||
|
||
(void) flock(histfd, LOCK_EX);
|
||
|
||
hsize = lseek(histfd, 0L, SEEK_END);
|
||
|
||
if (hsize == 0) {
|
||
/* add magic */
|
||
if (sprinkle(histfd)) {
|
||
hist_finish();
|
||
return;
|
||
}
|
||
} else if (hsize > 0) {
|
||
/*
|
||
* we have some data
|
||
*/
|
||
base = (void *)mmap(NULL, hsize, PROT_READ,
|
||
MAP_FILE | MAP_PRIVATE, histfd, 0);
|
||
/*
|
||
* check on its validity
|
||
*/
|
||
if (base == (unsigned char *)MAP_FAILED ||
|
||
*base != HMAGIC1 || base[1] != HMAGIC2) {
|
||
if (base != (unsigned char *)MAP_FAILED)
|
||
munmap((caddr_t)base, hsize);
|
||
hist_finish();
|
||
if (unlink(hname) /* fails */)
|
||
goto hiniterr;
|
||
goto retry;
|
||
}
|
||
if (hsize > 2) {
|
||
int rv = 0;
|
||
|
||
lines = hist_count_lines(base+2, hsize-2);
|
||
if (lines > histsize) {
|
||
/* we need to make the file smaller */
|
||
if (hist_shrink(base, hsize))
|
||
rv = unlink(hname);
|
||
munmap((caddr_t)base, hsize);
|
||
hist_finish();
|
||
if (rv) {
|
||
hiniterr:
|
||
bi_errorf("cannot unlink HISTFILE %s"
|
||
" - %s", hname, strerror(errno));
|
||
hsize = 0;
|
||
return;
|
||
}
|
||
goto retry;
|
||
}
|
||
}
|
||
histload(hist_source, base+2, hsize-2);
|
||
munmap((caddr_t)base, hsize);
|
||
}
|
||
(void) flock(histfd, LOCK_UN);
|
||
hsize = lseek(histfd, 0L, SEEK_END);
|
||
#endif
|
||
}
|
||
|
||
#if HAVE_PERSISTENT_HISTORY
|
||
typedef enum state {
|
||
shdr, /* expecting a header */
|
||
sline, /* looking for a null byte to end the line */
|
||
sn1, /* bytes 1 to 4 of a line no */
|
||
sn2, sn3, sn4
|
||
} State;
|
||
|
||
static int
|
||
hist_count_lines(unsigned char *base, int bytes)
|
||
{
|
||
State state = shdr;
|
||
int lines = 0;
|
||
|
||
while (bytes--) {
|
||
switch (state) {
|
||
case shdr:
|
||
if (*base == COMMAND)
|
||
state = sn1;
|
||
break;
|
||
case sn1:
|
||
state = sn2; break;
|
||
case sn2:
|
||
state = sn3; break;
|
||
case sn3:
|
||
state = sn4; break;
|
||
case sn4:
|
||
state = sline; break;
|
||
case sline:
|
||
if (*base == '\0')
|
||
lines++, state = shdr;
|
||
}
|
||
base++;
|
||
}
|
||
return lines;
|
||
}
|
||
|
||
/*
|
||
* Shrink the history file to histsize lines
|
||
*/
|
||
static int
|
||
hist_shrink(unsigned char *oldbase, int oldbytes)
|
||
{
|
||
int fd;
|
||
char nfile[PATH_MAX];
|
||
struct stat statb;
|
||
unsigned char *nbase = oldbase;
|
||
int nbytes = oldbytes;
|
||
|
||
nbase = hist_skip_back(nbase, &nbytes, histsize);
|
||
if (nbase == NULL)
|
||
return 1;
|
||
if (nbase == oldbase)
|
||
return 0;
|
||
|
||
/*
|
||
* create temp file
|
||
*/
|
||
shf_snprintf(nfile, sizeof(nfile), "%s.%d", hname, (int)procpid);
|
||
if ((fd = open(nfile, O_CREAT | O_TRUNC | O_WRONLY, 0600)) < 0)
|
||
return 1;
|
||
if (fstat(histfd, &statb) >= 0 &&
|
||
chown(nfile, statb.st_uid, statb.st_gid))
|
||
goto errout;
|
||
|
||
if (sprinkle(fd) || write(fd, nbase, nbytes) != nbytes) {
|
||
errout:
|
||
close(fd);
|
||
unlink(nfile);
|
||
return 1;
|
||
}
|
||
close(fd);
|
||
|
||
/*
|
||
* rename
|
||
*/
|
||
if (rename(nfile, hname) < 0)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* find a pointer to the data 'no' back from the end of the file
|
||
* return the pointer and the number of bytes left
|
||
*/
|
||
static unsigned char *
|
||
hist_skip_back(unsigned char *base, int *bytes, int no)
|
||
{
|
||
int lines = 0;
|
||
unsigned char *ep;
|
||
|
||
for (ep = base + *bytes; --ep > base; ) {
|
||
/* this doesn't really work: the 4 byte line number that is
|
||
* encoded after the COMMAND byte can itself contain the
|
||
* COMMAND byte....
|
||
*/
|
||
for (; ep > base && *ep != COMMAND; ep--)
|
||
;
|
||
if (ep == base)
|
||
break;
|
||
if (++lines == no) {
|
||
*bytes = *bytes - ((char *)ep - (char *)base);
|
||
return ep;
|
||
}
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/*
|
||
* load the history structure from the stored data
|
||
*/
|
||
static void
|
||
histload(Source *s, unsigned char *base, int bytes)
|
||
{
|
||
State state;
|
||
int lno = 0;
|
||
unsigned char *line = NULL;
|
||
|
||
for (state = shdr; bytes-- > 0; base++) {
|
||
switch (state) {
|
||
case shdr:
|
||
if (*base == COMMAND)
|
||
state = sn1;
|
||
break;
|
||
case sn1:
|
||
lno = (((*base)&0xff)<<24);
|
||
state = sn2;
|
||
break;
|
||
case sn2:
|
||
lno |= (((*base)&0xff)<<16);
|
||
state = sn3;
|
||
break;
|
||
case sn3:
|
||
lno |= (((*base)&0xff)<<8);
|
||
state = sn4;
|
||
break;
|
||
case sn4:
|
||
lno |= (*base)&0xff;
|
||
line = base+1;
|
||
state = sline;
|
||
break;
|
||
case sline:
|
||
if (*base == '\0') {
|
||
/* worry about line numbers */
|
||
if (histptr >= history && lno-1 != s->line) {
|
||
/* a replacement ? */
|
||
histinsert(s, lno, (char *)line);
|
||
} else {
|
||
s->line = lno;
|
||
histsave(lno, (char *)line, 0);
|
||
}
|
||
state = shdr;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Insert a line into the history at a specified number
|
||
*/
|
||
static void
|
||
histinsert(Source *s, int lno, const char *line)
|
||
{
|
||
char **hp;
|
||
|
||
if (lno >= s->line - (histptr - history) && lno <= s->line) {
|
||
hp = &histptr[lno - s->line];
|
||
if (*hp)
|
||
afree((void*)*hp, APERM);
|
||
*hp = str_save(line, APERM);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* write a command to the end of the history file
|
||
* This *MAY* seem easy but it's also necessary to check
|
||
* that the history file has not changed in size.
|
||
* If it has - then some other shell has written to it
|
||
* and we should read those commands to update our history
|
||
*/
|
||
static void
|
||
writehistfile(int lno, char *cmd)
|
||
{
|
||
int sizenow;
|
||
unsigned char *base;
|
||
unsigned char *new;
|
||
int bytes;
|
||
unsigned char hdr[5];
|
||
|
||
(void) flock(histfd, LOCK_EX);
|
||
sizenow = lseek(histfd, 0L, SEEK_END);
|
||
if (sizenow != hsize) {
|
||
/*
|
||
* Things have changed
|
||
*/
|
||
if (sizenow > hsize) {
|
||
/* someone has added some lines */
|
||
bytes = sizenow - hsize;
|
||
base = (void *)mmap(NULL, sizenow, PROT_READ,
|
||
MAP_FILE | MAP_PRIVATE, histfd, 0);
|
||
if (base == (unsigned char *)MAP_FAILED)
|
||
goto bad;
|
||
new = base + hsize;
|
||
if (*new != COMMAND) {
|
||
munmap((caddr_t)base, sizenow);
|
||
goto bad;
|
||
}
|
||
hist_source->line--;
|
||
histload(hist_source, new, bytes);
|
||
hist_source->line++;
|
||
lno = hist_source->line;
|
||
munmap((caddr_t)base, sizenow);
|
||
hsize = sizenow;
|
||
} else {
|
||
/* it has shrunk */
|
||
/* but to what? */
|
||
/* we'll give up for now */
|
||
goto bad;
|
||
}
|
||
}
|
||
/*
|
||
* we can write our bit now
|
||
*/
|
||
hdr[0] = COMMAND;
|
||
hdr[1] = (lno>>24)&0xff;
|
||
hdr[2] = (lno>>16)&0xff;
|
||
hdr[3] = (lno>>8)&0xff;
|
||
hdr[4] = lno&0xff;
|
||
bytes = strlen(cmd) + 1;
|
||
if ((write(histfd, hdr, 5) != 5) ||
|
||
(write(histfd, cmd, bytes) != bytes))
|
||
goto bad;
|
||
hsize = lseek(histfd, 0L, SEEK_END);
|
||
(void) flock(histfd, LOCK_UN);
|
||
return;
|
||
bad:
|
||
hist_finish();
|
||
}
|
||
|
||
void
|
||
hist_finish(void)
|
||
{
|
||
(void) flock(histfd, LOCK_UN);
|
||
(void) close(histfd);
|
||
histfd = 0;
|
||
}
|
||
|
||
/*
|
||
* add magic to the history file
|
||
*/
|
||
static int
|
||
sprinkle(int fd)
|
||
{
|
||
static const unsigned char mag[] = { HMAGIC1, HMAGIC2 };
|
||
|
||
return(write(fd, mag, 2) != 2);
|
||
}
|
||
#endif
|
||
|
||
#if !HAVE_SYS_SIGNAME
|
||
static const struct mksh_sigpair {
|
||
int nr;
|
||
const char *const name;
|
||
} mksh_sigpairs[] = {
|
||
#include "signames.inc"
|
||
{ 0, NULL }
|
||
};
|
||
#endif
|
||
|
||
void
|
||
inittraps(void)
|
||
{
|
||
int i;
|
||
const char *cs;
|
||
|
||
/* Populate sigtraps based on sys_signame and sys_siglist. */
|
||
for (i = 0; i <= NSIG; i++) {
|
||
sigtraps[i].signal = i;
|
||
if (i == SIGERR_) {
|
||
sigtraps[i].name = "ERR";
|
||
sigtraps[i].mess = "Error handler";
|
||
} else {
|
||
#if HAVE_SYS_SIGNAME
|
||
cs = sys_signame[i];
|
||
#else
|
||
const struct mksh_sigpair *pair = mksh_sigpairs;
|
||
while ((pair->nr != i) && (pair->name != NULL))
|
||
++pair;
|
||
cs = pair->name;
|
||
#endif
|
||
if ((cs == NULL) ||
|
||
(cs[0] == '\0'))
|
||
sigtraps[i].name = shf_smprintf("%d", i);
|
||
else {
|
||
char *s;
|
||
|
||
if (!strncasecmp(cs, "SIG", 3))
|
||
cs += 3;
|
||
sigtraps[i].name = s = str_save(cs, APERM);
|
||
while ((*s = ksh_toupper(*s)))
|
||
++s;
|
||
}
|
||
#if HAVE_SYS_SIGLIST
|
||
sigtraps[i].mess = sys_siglist[i];
|
||
#elif HAVE_STRSIGNAL
|
||
sigtraps[i].mess = strsignal(i);
|
||
#else
|
||
sigtraps[i].mess = NULL;
|
||
#endif
|
||
if ((sigtraps[i].mess == NULL) ||
|
||
(sigtraps[i].mess[0] == '\0'))
|
||
sigtraps[i].mess = shf_smprintf("Signal %d", i);
|
||
}
|
||
}
|
||
sigtraps[SIGEXIT_].name = "EXIT"; /* our name for signal 0 */
|
||
|
||
sigemptyset(&Sigact_ign.sa_mask);
|
||
Sigact_ign.sa_flags = 0; /* interruptible */
|
||
Sigact_ign.sa_handler = SIG_IGN;
|
||
|
||
sigtraps[SIGINT].flags |= TF_DFL_INTR | TF_TTY_INTR;
|
||
sigtraps[SIGQUIT].flags |= TF_DFL_INTR | TF_TTY_INTR;
|
||
sigtraps[SIGTERM].flags |= TF_DFL_INTR;/* not fatal for interactive */
|
||
sigtraps[SIGHUP].flags |= TF_FATAL;
|
||
sigtraps[SIGCHLD].flags |= TF_SHELL_USES;
|
||
|
||
/* these are always caught so we can clean up any temporary files. */
|
||
setsig(&sigtraps[SIGINT], trapsig, SS_RESTORE_ORIG);
|
||
setsig(&sigtraps[SIGQUIT], trapsig, SS_RESTORE_ORIG);
|
||
setsig(&sigtraps[SIGTERM], trapsig, SS_RESTORE_ORIG);
|
||
setsig(&sigtraps[SIGHUP], trapsig, SS_RESTORE_ORIG);
|
||
}
|
||
|
||
static void alarm_catcher(int sig);
|
||
|
||
void
|
||
alarm_init(void)
|
||
{
|
||
sigtraps[SIGALRM].flags |= TF_SHELL_USES;
|
||
setsig(&sigtraps[SIGALRM], alarm_catcher,
|
||
SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
alarm_catcher(int sig __unused)
|
||
{
|
||
int errno_ = errno;
|
||
|
||
if (ksh_tmout_state == TMOUT_READING) {
|
||
int left = alarm(0);
|
||
|
||
if (left == 0) {
|
||
ksh_tmout_state = TMOUT_LEAVING;
|
||
intrsig = 1;
|
||
} else
|
||
alarm(left);
|
||
}
|
||
errno = errno_;
|
||
}
|
||
|
||
Trap *
|
||
gettrap(const char *name, int igncase)
|
||
{
|
||
int n = NSIG + 1;
|
||
Trap *p;
|
||
const char *n2;
|
||
int (*cmpfunc)(const char *, const char *) = strcmp;
|
||
|
||
if (ksh_isdigit(*name)) {
|
||
if (getn(name, &n) && 0 <= n && n < NSIG)
|
||
return (&sigtraps[n]);
|
||
else
|
||
return (NULL);
|
||
}
|
||
|
||
n2 = strncasecmp(name, "SIG", 3) ? NULL : name + 3;
|
||
if (igncase)
|
||
cmpfunc = strcasecmp;
|
||
for (p = sigtraps; --n >= 0; p++)
|
||
if (!cmpfunc(p->name, name) || (n2 && !cmpfunc(p->name, n2)))
|
||
return (p);
|
||
return (NULL);
|
||
}
|
||
|
||
/*
|
||
* trap signal handler
|
||
*/
|
||
void
|
||
trapsig(int i)
|
||
{
|
||
Trap *p = &sigtraps[i];
|
||
int errno_ = errno;
|
||
|
||
trap = p->set = 1;
|
||
if (p->flags & TF_DFL_INTR)
|
||
intrsig = 1;
|
||
if ((p->flags & TF_FATAL) && !p->trap) {
|
||
fatal_trap = 1;
|
||
intrsig = 1;
|
||
}
|
||
if (p->shtrap)
|
||
(*p->shtrap)(i);
|
||
errno = errno_;
|
||
}
|
||
|
||
/* called when we want to allow the user to ^C out of something - won't
|
||
* work if user has trapped SIGINT.
|
||
*/
|
||
void
|
||
intrcheck(void)
|
||
{
|
||
if (intrsig)
|
||
runtraps(TF_DFL_INTR|TF_FATAL);
|
||
}
|
||
|
||
/* called after EINTR to check if a signal with normally causes process
|
||
* termination has been received.
|
||
*/
|
||
int
|
||
fatal_trap_check(void)
|
||
{
|
||
int i;
|
||
Trap *p;
|
||
|
||
/* todo: should check if signal is fatal, not the TF_DFL_INTR flag */
|
||
for (p = sigtraps, i = NSIG+1; --i >= 0; p++)
|
||
if (p->set && (p->flags & (TF_DFL_INTR|TF_FATAL)))
|
||
/* return value is used as an exit code */
|
||
return 128 + p->signal;
|
||
return 0;
|
||
}
|
||
|
||
/* Returns the signal number of any pending traps: ie, a signal which has
|
||
* occurred for which a trap has been set or for which the TF_DFL_INTR flag
|
||
* is set.
|
||
*/
|
||
int
|
||
trap_pending(void)
|
||
{
|
||
int i;
|
||
Trap *p;
|
||
|
||
for (p = sigtraps, i = NSIG+1; --i >= 0; p++)
|
||
if (p->set && ((p->trap && p->trap[0]) ||
|
||
((p->flags & (TF_DFL_INTR|TF_FATAL)) && !p->trap)))
|
||
return p->signal;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* run any pending traps. If intr is set, only run traps that
|
||
* can interrupt commands.
|
||
*/
|
||
void
|
||
runtraps(int flag)
|
||
{
|
||
int i;
|
||
Trap *p;
|
||
|
||
if (ksh_tmout_state == TMOUT_LEAVING) {
|
||
ksh_tmout_state = TMOUT_EXECUTING;
|
||
warningf(false, "timed out waiting for input");
|
||
unwind(LEXIT);
|
||
} else
|
||
/* XXX: this means the alarm will have no effect if a trap
|
||
* is caught after the alarm() was started...not good.
|
||
*/
|
||
ksh_tmout_state = TMOUT_EXECUTING;
|
||
if (!flag)
|
||
trap = 0;
|
||
if (flag & TF_DFL_INTR)
|
||
intrsig = 0;
|
||
if (flag & TF_FATAL)
|
||
fatal_trap = 0;
|
||
for (p = sigtraps, i = NSIG+1; --i >= 0; p++)
|
||
if (p->set && (!flag ||
|
||
((p->flags & flag) && p->trap == NULL)))
|
||
runtrap(p);
|
||
}
|
||
|
||
void
|
||
runtrap(Trap *p)
|
||
{
|
||
int i = p->signal;
|
||
char *trapstr = p->trap;
|
||
int oexstat;
|
||
int old_changed = 0;
|
||
|
||
p->set = 0;
|
||
if (trapstr == NULL) { /* SIG_DFL */
|
||
if (p->flags & TF_FATAL) {
|
||
/* eg, SIGHUP */
|
||
exstat = 128 + i;
|
||
unwind(LLEAVE);
|
||
}
|
||
if (p->flags & TF_DFL_INTR) {
|
||
/* eg, SIGINT, SIGQUIT, SIGTERM, etc. */
|
||
exstat = 128 + i;
|
||
unwind(LINTR);
|
||
}
|
||
return;
|
||
}
|
||
if (trapstr[0] == '\0') /* SIG_IGN */
|
||
return;
|
||
if (i == SIGEXIT_ || i == SIGERR_) { /* avoid recursion on these */
|
||
old_changed = p->flags & TF_CHANGED;
|
||
p->flags &= ~TF_CHANGED;
|
||
p->trap = NULL;
|
||
}
|
||
oexstat = exstat;
|
||
/* Note: trapstr is fully parsed before anything is executed, thus
|
||
* no problem with afree(p->trap) in settrap() while still in use.
|
||
*/
|
||
command(trapstr);
|
||
exstat = oexstat;
|
||
if (i == SIGEXIT_ || i == SIGERR_) {
|
||
if (p->flags & TF_CHANGED)
|
||
/* don't clear TF_CHANGED */
|
||
afree(trapstr, APERM);
|
||
else
|
||
p->trap = trapstr;
|
||
p->flags |= old_changed;
|
||
}
|
||
}
|
||
|
||
/* clear pending traps and reset user's trap handlers; used after fork(2) */
|
||
void
|
||
cleartraps(void)
|
||
{
|
||
int i;
|
||
Trap *p;
|
||
|
||
trap = 0;
|
||
intrsig = 0;
|
||
fatal_trap = 0;
|
||
for (i = NSIG+1, p = sigtraps; --i >= 0; p++) {
|
||
p->set = 0;
|
||
if ((p->flags & TF_USER_SET) && (p->trap && p->trap[0]))
|
||
settrap(p, NULL);
|
||
}
|
||
}
|
||
|
||
/* restore signals just before an exec(2) */
|
||
void
|
||
restoresigs(void)
|
||
{
|
||
int i;
|
||
Trap *p;
|
||
|
||
for (i = NSIG+1, p = sigtraps; --i >= 0; p++)
|
||
if (p->flags & (TF_EXEC_IGN|TF_EXEC_DFL))
|
||
setsig(p, (p->flags & TF_EXEC_IGN) ? SIG_IGN : SIG_DFL,
|
||
SS_RESTORE_CURR|SS_FORCE);
|
||
}
|
||
|
||
void
|
||
settrap(Trap *p, const char *s)
|
||
{
|
||
sig_t f;
|
||
|
||
if (p->trap)
|
||
afree(p->trap, APERM);
|
||
p->trap = str_save(s, APERM); /* handles s == 0 */
|
||
p->flags |= TF_CHANGED;
|
||
f = !s ? SIG_DFL : s[0] ? trapsig : SIG_IGN;
|
||
|
||
p->flags |= TF_USER_SET;
|
||
if ((p->flags & (TF_DFL_INTR|TF_FATAL)) && f == SIG_DFL)
|
||
f = trapsig;
|
||
else if (p->flags & TF_SHELL_USES) {
|
||
if (!(p->flags & TF_ORIG_IGN) || Flag(FTALKING)) {
|
||
/* do what user wants at exec time */
|
||
p->flags &= ~(TF_EXEC_IGN|TF_EXEC_DFL);
|
||
if (f == SIG_IGN)
|
||
p->flags |= TF_EXEC_IGN;
|
||
else
|
||
p->flags |= TF_EXEC_DFL;
|
||
}
|
||
|
||
/* assumes handler already set to what shell wants it
|
||
* (normally trapsig, but could be j_sigchld() or SIG_IGN)
|
||
*/
|
||
return;
|
||
}
|
||
|
||
/* todo: should we let user know signal is ignored? how? */
|
||
setsig(p, f, SS_RESTORE_CURR|SS_USER);
|
||
}
|
||
|
||
/* Called by c_print() when writing to a co-process to ensure SIGPIPE won't
|
||
* kill shell (unless user catches it and exits)
|
||
*/
|
||
int
|
||
block_pipe(void)
|
||
{
|
||
int restore_dfl = 0;
|
||
Trap *p = &sigtraps[SIGPIPE];
|
||
|
||
if (!(p->flags & (TF_ORIG_IGN|TF_ORIG_DFL))) {
|
||
setsig(p, SIG_IGN, SS_RESTORE_CURR);
|
||
if (p->flags & TF_ORIG_DFL)
|
||
restore_dfl = 1;
|
||
} else if (p->cursig == SIG_DFL) {
|
||
setsig(p, SIG_IGN, SS_RESTORE_CURR);
|
||
restore_dfl = 1; /* restore to SIG_DFL */
|
||
}
|
||
return restore_dfl;
|
||
}
|
||
|
||
/* Called by c_print() to undo whatever block_pipe() did */
|
||
void
|
||
restore_pipe(int restore_dfl)
|
||
{
|
||
if (restore_dfl)
|
||
setsig(&sigtraps[SIGPIPE], SIG_DFL, SS_RESTORE_CURR);
|
||
}
|
||
|
||
/* Set action for a signal. Action may not be set if original
|
||
* action was SIG_IGN, depending on the value of flags and FTALKING.
|
||
*/
|
||
int
|
||
setsig(Trap *p, sig_t f, int flags)
|
||
{
|
||
struct sigaction sigact;
|
||
|
||
if (p->signal == SIGEXIT_ || p->signal == SIGERR_)
|
||
return 1;
|
||
|
||
/* First time setting this signal? If so, get and note the current
|
||
* setting.
|
||
*/
|
||
if (!(p->flags & (TF_ORIG_IGN|TF_ORIG_DFL))) {
|
||
sigaction(p->signal, &Sigact_ign, &sigact);
|
||
p->flags |= sigact.sa_handler == SIG_IGN ?
|
||
TF_ORIG_IGN : TF_ORIG_DFL;
|
||
p->cursig = SIG_IGN;
|
||
}
|
||
|
||
/* Generally, an ignored signal stays ignored, except if
|
||
* - the user of an interactive shell wants to change it
|
||
* - the shell wants for force a change
|
||
*/
|
||
if ((p->flags & TF_ORIG_IGN) && !(flags & SS_FORCE) &&
|
||
(!(flags & SS_USER) || !Flag(FTALKING)))
|
||
return 0;
|
||
|
||
setexecsig(p, flags & SS_RESTORE_MASK);
|
||
|
||
/* This is here 'cause there should be a way of clearing shtraps, but
|
||
* don't know if this is a sane way of doing it. At the moment,
|
||
* all users of shtrap are lifetime users (SIGCHLD, SIGALRM, SIGWINCH).
|
||
*/
|
||
if (!(flags & SS_USER))
|
||
p->shtrap = (sig_t)NULL;
|
||
if (flags & SS_SHTRAP) {
|
||
p->shtrap = f;
|
||
f = trapsig;
|
||
}
|
||
|
||
if (p->cursig != f) {
|
||
p->cursig = f;
|
||
sigemptyset(&sigact.sa_mask);
|
||
sigact.sa_flags = 0 /* interruptible */;
|
||
sigact.sa_handler = f;
|
||
sigaction(p->signal, &sigact, NULL);
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* control what signal is set to before an exec() */
|
||
void
|
||
setexecsig(Trap *p, int restore)
|
||
{
|
||
/* XXX debugging */
|
||
if (!(p->flags & (TF_ORIG_IGN|TF_ORIG_DFL)))
|
||
internal_errorf("setexecsig: unset signal %d(%s)",
|
||
p->signal, p->name);
|
||
|
||
/* restore original value for exec'd kids */
|
||
p->flags &= ~(TF_EXEC_IGN|TF_EXEC_DFL);
|
||
switch (restore & SS_RESTORE_MASK) {
|
||
case SS_RESTORE_CURR: /* leave things as they currently are */
|
||
break;
|
||
case SS_RESTORE_ORIG:
|
||
p->flags |= p->flags & TF_ORIG_IGN ? TF_EXEC_IGN : TF_EXEC_DFL;
|
||
break;
|
||
case SS_RESTORE_DFL:
|
||
p->flags |= TF_EXEC_DFL;
|
||
break;
|
||
case SS_RESTORE_IGN:
|
||
p->flags |= TF_EXEC_IGN;
|
||
break;
|
||
}
|
||
}
|