//
// Copy the last <n> commands to a new file and make this the history file.
//
static History_t *hist_trim(History_t *hp, int n) {
char *cp;
int incmd = 1, c = 0;
History_t *hist_new, *hist_old = hp;
char *buff, *endbuff, *tmpname = NULL;
off_t oldp, newp;
struct stat statb;
unlink(hist_old->histname);
if (access(hist_old->histname, F_OK) >= 0) {
// The unlink can fail on windows 95.
int fd;
char *last, *name = hist_old->histname;
sh_close(sffileno(hist_old->histfp));
last = strrchr(name, '/');
if (last) {
*last = 0;
tmpname = ast_temp_file(name, "hist", &fd, 0);
*last = '/';
} else {
tmpname = ast_temp_file(".", "hist", &fd, 0);
}
if (!tmpname) {
errormsg(SH_DICT, ERROR_exit(1), e_create, "hist");
__builtin_unreachable();
}
close(fd);
if (rename(name, tmpname) < 0) {
free(tmpname);
tmpname = name;
}
fd = open(tmpname, O_RDONLY | O_CLOEXEC);
// What happens if this fails and returns -1? Coverity Scan #310940.
(void)sfsetfd(hist_old->histfp, fd);
if (tmpname == name) {
free(tmpname);
tmpname = NULL;
}
}
hist_ptr = NULL;
if (fstat(sffileno(hist_old->histfp), &statb) >= 0) {
histinit = 1;
histmode = statb.st_mode;
}
if (!sh_histinit(hp->histshell)) {
// Use the old history file.
hist_ptr = hist_old;
return hist_ptr;
}
hist_new = hist_ptr;
hist_ptr = hist_old;
if (--n < 0) n = 0;
newp = hist_seek(hist_old, ++n);
while (1) {
if (!incmd) {
c = hist_ind(hist_new, ++hist_new->histind);
hist_new->histcmds[c] = hist_new->histcnt;
if (hist_new->histcnt > hist_new->histmarker + HIST_BSIZE / 2) {
char locbuff[HIST_MARKSZ];
hist_marker(locbuff, hist_new->histind);
sfwrite(hist_new->histfp, locbuff, HIST_MARKSZ);
hist_new->histcnt += HIST_MARKSZ;
hist_new->histmarker = hist_new->histcmds[hist_ind(hist_new, c)] =
hist_new->histcnt;
}
oldp = newp;
newp = hist_seek(hist_old, ++n);
if (newp <= oldp) break;
}
if (!(buff = (char *)sfreserve(hist_old->histfp, SF_UNBOUND, 0))) break;
*(endbuff = (cp = buff) + sfvalue(hist_old->histfp)) = 0;
// Copy to null byte.
incmd = 0;
cp += strlen(cp) + 1; // point past the terminating null
if (cp > endbuff) {
incmd = 1;
} else if (*cp == 0) {
cp++;
}
if (cp > endbuff) cp = endbuff;
c = cp - buff;
hist_new->histcnt += c;
sfwrite(hist_new->histfp, buff, c);
}
hist_cancel(hist_new);
sfclose(hist_old->histfp);
if (tmpname) {
unlink(tmpname);
free(tmpname);
}
free(hist_old);
hist_ptr = hist_new;
return hist_ptr;
}
//
// This routine reads the history file from the present position to the end-of-file and puts the
// information in the in-core history table. Note that HIST_CMDNO is only recognized at the
// beginning of a command and that HIST_UNDO as the first character of a command is skipped unless
// it is followed by 0. If followed by 0 then it cancels the previous command.
//
void hist_eof(History_t *hp) {
char *cp, *first, *endbuff;
int n;
int incmd = 0;
int skip = 0;
int oldind = hp->histind;
off_t count = hp->histcnt;
off_t last = sfseek(hp->histfp, 0, SEEK_END);
if (last < count) {
last = -1;
count = 2 + HIST_MARKSZ;
if ((hp->histind -= hp->histsize) < 0) hp->histind = 1;
}
again:
sfseek(hp->histfp, count, SEEK_SET);
while ((cp = (char *)sfreserve(hp->histfp, SF_UNBOUND, 0))) {
n = sfvalue(hp->histfp);
endbuff = cp + n;
first = cp += skip;
while (1) {
while (!incmd) {
if (cp > first) {
count += (cp - first);
n = hist_ind(hp, ++hp->histind);
#if 0
// TODO: Figure out if this should be enabled. Originally excluded via `#ifdef future`.
if (count == hp->histcmds[n]) {
sfprintf(sfstderr, "count match n=%d\n", n);
if (histinit) {
histinit = 0;
return;
}
} else if (n >= histinit)
#endif
hp->histcmds[n] = count;
first = cp;
}
switch (*((unsigned char *)(cp++))) {
case HIST_CMDNO: {
if (*cp == 0) {
hp->histmarker = count + 2;
cp += (HIST_MARKSZ - 1);
hp->histind--;
if (!histinit && (cp <= endbuff)) {
unsigned char *marker = (unsigned char *)(cp - 4);
hp->histind =
((marker[0] << 16) | (marker[1] << 8) | (marker[2] - 1));
}
}
break;
}
case HIST_UNDO: {
if (*cp == 0) {
cp += 1;
hp->histind -= 2;
}
break;
}
default: {
cp--;
incmd = 1;
}
}
if (cp >= endbuff) {
goto refill;
}
}
first = cp;
while (*cp) {
if (++cp >= endbuff) goto refill;
}
incmd = 0;
while (*cp == 0) {
if (++cp >= endbuff) goto refill;
}
}
refill:
count += (cp - first);
skip = (cp - endbuff);
if (!incmd && !skip) hp->histcmds[hist_ind(hp, ++hp->histind)] = count;
}
hp->histcnt = count;
if (incmd && last) {
sfputc(hp->histfp, 0);
hist_cancel(hp);
count = 2;
skip = 0;
oldind -= hp->histind;
hp->histind = hp->histind - hp->histsize + oldind + 2;
if (hp->histind < 0) hp->histind = 1;
if (last < 0) {
char buff[HIST_MARKSZ];
int fd = open(hp->histname, O_RDWR | O_CLOEXEC);
if (fd >= 0) {
hist_marker(buff, hp->histind);
write(fd, (char *)hist_stamp, 2);
write(fd, buff, HIST_MARKSZ);
sh_close(fd);
}
}
last = 0;
goto again;
}
}
int b_hist(int argc,char *argv[], void *extra)
{
register History_t *hp;
register char *arg;
register int flag,fdo;
register Shell_t *shp = ((Shbltin_t*)extra)->shp;
Sfio_t *outfile;
char *fname;
int range[2], incr, index2, indx= -1;
char *edit = 0; /* name of editor */
char *replace = 0; /* replace old=new */
int lflag = 0, nflag = 0, rflag = 0;
#if SHOPT_HISTEXPAND
int pflag = 0;
#endif
Histloc_t location;
NOT_USED(argc);
if(!sh_histinit((void*)shp))
errormsg(SH_DICT,ERROR_system(1),e_histopen);
hp = shp->gd->hist_ptr;
while((flag = optget(argv,sh_opthist))) switch(flag)
{
case 'e':
edit = opt_info.arg;
break;
case 'n':
nflag++;
break;
case 'l':
lflag++;
break;
case 'r':
rflag++;
break;
case 's':
edit = "-";
break;
#if SHOPT_HISTEXPAND
case 'p':
pflag++;
break;
#endif
case 'N':
if(indx<=0)
{
if((flag = hist_max(hp) - opt_info.num-1) < 0)
flag = 1;
range[++indx] = flag;
break;
}
case ':':
errormsg(SH_DICT,2, "%s", opt_info.arg);
break;
case '?':
errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
break;
}
if(error_info.errors)
errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
argv += (opt_info.index-1);
#if SHOPT_HISTEXPAND
if(pflag)
{
hist_cancel(hp);
pflag = 0;
while(arg=argv[1])
{
flag = hist_expand(arg,&replace);
if(!(flag & HIST_ERROR))
sfputr(sfstdout, replace, '\n');
else
pflag = 1;
if(replace)
free(replace);
argv++;
}
return pflag;
}
#endif
flag = indx;
while(flag<1 && (arg=argv[1]))
{
/* look for old=new argument */
if(!replace && strchr(arg+1,'='))
{
replace = arg;
argv++;
continue;
}
else if(isdigit(*arg) || *arg == '-')
{
/* see if completely numeric */
do arg++;
while(isdigit(*arg));
if(*arg==0)
{
arg = argv[1];
range[++flag] = (int)strtol(arg, (char**)0, 10);
if(*arg == '-')
range[flag] += (hist_max(hp)-1);
argv++;
continue;
}
}
/* search for last line starting with string */
location = hist_find(hp,argv[1],hist_max(hp)-1,0,-1);
if((range[++flag] = location.hist_command) < 0)
errormsg(SH_DICT,ERROR_exit(1),e_found,argv[1]);
argv++;
}
if(flag <0)
{
/* set default starting range */
if(lflag)
{
flag = hist_max(hp)-16;
if(flag<1)
flag = 1;
}
else
flag = hist_max(hp)-2;
range[0] = flag;
flag = 0;
}
index2 = hist_min(hp);
if(range[0]<index2)
range[0] = index2;
if(flag==0)
/* set default termination range */
range[1] = ((lflag && !edit)?hist_max(hp)-1:range[0]);
if(range[1]>=(flag=(hist_max(hp) - !lflag)))
range[1] = flag;
/* check for valid ranges */
if(range[1]<index2 || range[0]>=flag)
errormsg(SH_DICT,ERROR_exit(1),e_badrange,range[0],range[1]);
if(edit && *edit=='-' && range[0]!=range[1])
errormsg(SH_DICT,ERROR_exit(1),e_eneedsarg);
/* now list commands from range[rflag] to range[1-rflag] */
incr = 1;
flag = rflag>0;
if(range[1-flag] < range[flag])
incr = -1;
if(lflag)
{
outfile = sfstdout;
arg = "\n\t";
}
else
{
if(!(fname=pathtmp(NIL(char*),0,0,NIL(int*))))
errormsg(SH_DICT,ERROR_exit(1),e_create,"");
if((fdo=open(fname,O_CREAT|O_RDWR,S_IRUSR|S_IWUSR)) < 0)
errormsg(SH_DICT,ERROR_system(1),e_create,fname);
outfile= sfnew(NIL(Sfio_t*),shp->outbuff,IOBSIZE,fdo,SF_WRITE);
arg = "\n";
nflag++;
}
while(1)
{
if(nflag==0)
sfprintf(outfile,"%d\t",range[flag]);
else if(lflag)
sfputc(outfile,'\t');
hist_list(shp->gd->hist_ptr,outfile,hist_tell(shp->gd->hist_ptr,range[flag]),0,arg);
if(lflag)
sh_sigcheck(shp);
if(range[flag] == range[1-flag])
break;
range[flag] += incr;
}
if(lflag)
return(0);
sfclose(outfile);
hist_eof(hp);
arg = edit;
if(!arg && !(arg=nv_getval(sh_scoped(shp,HISTEDIT))) && !(arg=nv_getval(sh_scoped(shp,FCEDNOD))))
arg = (char*)e_defedit;
#ifdef apollo
/*
* Code to support the FC using the pad editor.
* Exampled of how to use: HISTEDIT=pad
*/
if (strcmp (arg, "pad") == 0)
{
extern int pad_create(char*);
sh_close(fdo);
fdo = pad_create(fname);
pad_wait(fdo);
unlink(fname);
strcat(fname, ".bak");
unlink(fname);
lseek(fdo,(off_t)0,SEEK_SET);
}
else
{
#endif /* apollo */
if(*arg != '-')
{
char *com[3];
com[0] = arg;
com[1] = fname;
com[2] = 0;
error_info.errors = sh_eval(sh_sfeval(com),0);
}
fdo = sh_chkopen(fname);
unlink(fname);
free((void*)fname);
#ifdef apollo
}
#endif /* apollo */
/* don't history fc itself unless forked */
error_info.flags |= ERROR_SILENT;
if(!sh_isstate(SH_FORKED))
hist_cancel(hp);
sh_onstate(SH_HISTORY);
sh_onstate(SH_VERBOSE); /* echo lines as read */
if(replace)
hist_subst(error_info.id,fdo,replace);
else if(error_info.errors == 0)
{
char buff[IOBSIZE+1];
Sfio_t *iop = sfnew(NIL(Sfio_t*),buff,IOBSIZE,fdo,SF_READ);
/* read in and run the command */
if(shp->hist_depth++ > HIST_RECURSE)
errormsg(SH_DICT,ERROR_exit(1),e_toodeep,"history");
sh_eval(iop,1);
shp->hist_depth--;
}
