static void displayTag2(int string, Context_Tag tag)
{ ctxt_info_t *info;
info = &CTXT_INFO_STRUCT(tag);
displayString(string, info->c_sizecur);
}
static void displayTag1(int string, Context_Tag tag)
{ ctxt_info_t *info;
info = &CTXT_INFO_STRUCT(tag);
displayString(string, info->c_sizecur
, info->c_nummin < info->c_nummax
? info->c_nummax - info->c_nummin : 0);
}
int ctxtClear(const Context_Tag tag)
{ ctxt_info_t *info;
ctxtCheckInfoTag(tag);
assert(ctxtFromTag(tag) != CTXT_INVALID);
/* Clear the useage information */
info = &CTXT_INFO_STRUCT(tag);
info->c_sizecur = 0;
info->c_nummax = info->c_nummin= 0;
/* Clear the items within the context */
return env_forAll(ctxtFromTag(tag), clear, (void*)tag);
}
static int scan (void * arg, word segm, word ofs) {
Context_Tag tag;
ctxt_info_t *info;
(void)arg;
assert(segm);
assert(ofs != (word)-1);
redo:
if((tag = peekb(segm, ofs), ctxtIsInfoTag(tag))) {
info = &CTXT_INFO_STRUCT(tag);
if(peekb(segm, ofs + 1) == '=' && peekb(segm, ofs + 4) == 0) {
/* status entry */
info->c_sizemax = peekw(segm, ofs + 2) & ~0x8001;
} else { /* normal entry */
char far *p = MK_FP(segm, ofs + 1);
unsigned num;
for(num = 0; isxdigit(*p); ++p) {
num <<= 8;
if(isdigit(*p))
num |= *p & 0xf;
else {
assert(islower(*p));
num |= *p - 'a' + 10;
}
}
if(*p == '=') {
info->c_sizecur += env_varlen(segm, ofs);
if(num < info->c_nummin)
info->c_nummin = num;
if(num > info->c_nummax)
info->c_nummax = num;
} else {
/* Invalid entry -> remove to make room for useful stuff */
env_subVarOffset(segm, ofs);
goto redo;
}
}
} else if(tag > ' ') { /* Alias */
CTXT_INFO(CTXT_TAG_ALIAS, sizecur) += env_varlen(segm ,ofs);
}
return 0; /* proceed */
}
int ctxtPush(const Context_Tag tag, const char * const buf)
{ ctxt_info_t *info;
ctxtCheckInfoTag(tag);
assert(buf);
info = &CTXT_INFO_STRUCT(tag);
if(info->c_nummax == (unsigned)-1) {
/* numbers will wrap -> recalculate them */
ctxtRenumberItems(tag);
if(info->c_nummax == (unsigned)-1)
return E_NoItems;
}
if(ctxtSet(tag, info->c_nummax + 1, buf) == E_None)
return E_None;
return E_NoMem;
}
int ctxtPop(const Context_Tag tag, char ** const Xbuf)
{ ctxt_info_t *info;
char *buf;
ctxtCheckInfoTag(tag);
assert(Xbuf);
info = &CTXT_INFO_STRUCT(tag);
while(info->c_nummax > info->c_nummin)
switch(ctxtGet(1, tag, info->c_nummax--, &buf)) {
case 0: /* OK */
*Xbuf = buf;
return 1;
case 1: /* no such entry */
break; /* --> ifgnore silently */
case 2: /* out of memory */
error_out_of_memory();
return 0; /* will case "context empty" message */
}
/* Nothing in the stack ==> make sure it's consistent */
ctxtClear(tag);
return 0;
}
void displayPrompt(const char *pr)
{
#ifdef FEATURE_ENVVARS_IN_PROMPT
char *buf = strdup(pr);
char *expanded = malloc(MAX_INTERNAL_COMMAND_SIZE + sizeof(errorlevel) * 8);
if(buf && expanded) {
if(!expandEnvVars(buf, expanded))
error_line_too_long();
else
pr = expanded;
}
free(buf);
#endif
while (*pr)
{
if(*pr != '$') {
outc(*pr);
} else {
switch (toupper(*++pr)) {
case 'A': outc('&'); break;
case 'B': outc('|'); break;
case 'C': outc('('); break;
/* case 'D': see below */
case 'E': outc(27); break; /* Decimal 27 */
case 'F': outc(')'); break;
case 'G': outc('>'); break;
case 'H': outc(8); break; /* Decimal 8 */
case 'L': outc('<'); break;
/* case 'M': outc('<'); break; remote name of current drive */
/* case 'N': see below */
/* case 'P': see below */
case 'Q': outc('='); break;
case 'S': outc(' '); break;
/* case 'T': see below */
/* case 'V': see below */
case '$': outc('$'); break;
case '_': outc('\n'); break;
/* case '+': see below */
case 'D':
{ char *p;
if((p = curDateLong()) != 0) {
outs(p);
free(p);
}
break;
}
case 'N':
{
outc( ( getdisk() + 'A' ) );
break;
}
case 'P':
{
#ifdef FEATURE_LONG_FILENAMES
char pathname[MAXDIR];
IREGS r;
printf("%c:\\", getdisk() + 'A');
r.r_ax = 0x7147;
r.r_dx = 0;
r.r_si = FP_OFF(pathname);
r.r_ds = FP_SEG(pathname);
intrpt(0x21, &r);
if(r.r_flags & 1 || r.r_ax == 0x7100) {
r.r_ax = 0x4700;
intrpt(0x21, &r);
}
if(r.r_flags & 1) break;
outs(pathname);
#else
char *p;
if((p = cwd(0)) != 0) {
outs(p);
free(p);
}
#endif
break;
}
case 'T':
{
char *p;
if((p = curTime()) != 0) {
outs(p);
free(p);
}
break;
}
case 'V':
{
/* #1776 fputs(shellname, stdout); */
printf("%s v%s", shellname, shellver);
break;
}
case '+': /* Levels of PUSHD */
{
#ifdef INCLUDE_CMD_PUSHD
ctxt_info_t *info;
int i;
info = &CTXT_INFO_STRUCT(CTXT_TAG_DIRSTACK);
assert(info);
if((i = info->c_nummax) > 0) do {
outc('+');
} while(--i);
#endif
}
}
}
pr++;
}
#ifdef FEATURE_ENVVARS_IN_PROMPT
free(expanded);
#endif
}
int chgCtxt(const Context_Tag tag, const char * const name, const char * const value)
{ word segm, ofs;
int newlen;
assert(name);
ctxtCheckInfoTag(tag);
segm = ctxtFromTag(tag);
assert(segm);
newlen = value? strlen(name) + strlen(value) + 2: 0;
if((ofs = env_findVar(segm, name)) != (word)-1)
newlen -= env_varlen(segm, ofs);
/* Make sure the context has enough room to add the value to */
if(newlen > 0) { /* contents size will grow */
ctxt_info_t *hinfo, *dinfo;
/* aliases may not exceed sizemax */
if(tag == CTXT_TAG_ALIAS) {
if(CTXT_INFO(CTXT_TAG_ALIAS, sizemax)
- CTXT_INFO(CTXT_TAG_ALIAS, sizecur) < newlen) {
error_alias_out_of_memory();
return E_NoMem;
}
}
/* Otherwise a removeable entry is removed;
those are:
oldest item of history
oldest item of dirstack */
hinfo = segm == ctxtFromTag(CTXT_TAG_HISTORY)
? &CTXT_INFO_STRUCT(CTXT_TAG_HISTORY): 0;
dinfo = segm == ctxtFromTag(CTXT_TAG_DIRSTACK)
? &CTXT_INFO_STRUCT(CTXT_TAG_DIRSTACK): 0;
while(env_freeCount(segm) < newlen) {
/* There are two structures that can shrink:
history & dirstack */
if(hinfo && (hinfo->c_sizecur <= hinfo->c_sizemax
/* inconsitency of redundant info */
|| hinfo->c_nummin >= hinfo->c_nummax))
/* in range -> ignore */
hinfo = 0;
if(dinfo && (dinfo->c_sizecur <= dinfo->c_sizemax
/* inconsitency of redundant info */
|| dinfo->c_nummin >= dinfo->c_nummax))
/* in range -> ignore */
dinfo = 0;
if(hinfo && dinfo) { /* Choose one */
if(weight(hinfo) < weight(dinfo))
ctxtGet(1, CTXT_TAG_DIRSTACK, ++dinfo->c_nummin, 0);
else
ctxtGet(1, CTXT_TAG_HISTORY, ++hinfo->c_nummin, 0);
} else if(dinfo)
ctxtGet(1, CTXT_TAG_DIRSTACK, ++dinfo->c_nummin, 0);
else if(hinfo)
ctxtGet(1, CTXT_TAG_HISTORY, ++hinfo->c_nummin, 0);
else { /* no space left */
error_context_out_of_memory();
return E_NoMem;
}
}
}
/* return values 1 and 3 are OK */
switch(env_change(segm, name, value)) {
case 2: /* variable to delete not found <-> no problem */
case 1: case 3: /* var replaced | deleted | inserted ==> OK */
CTXT_INFO(tag, sizecur) += newlen;
return 0;
case 0: /* Cannot insert */
dprintf(("chgCtxt(): out-of-mem shouldn't occure here!\n"));
error_context_out_of_memory();
return E_NoMem;
default:
return E_Syntax;
}
}
