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mlisp.c
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mlisp.c
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/* Unix Emacs MLisp (Mock/Minimal Lisp).
This atrocity is used for writing extensions to Emacs.
MLisp is Lisp without the CONS function, and all that that implies.
(including the fact that MLisp programs are not MLisp data structures) */
/* Copyright (c) 1981,1980 James Gosling */
/* Modified 8-Sept-81 Jeffrey Mogul (JCM) at Stanford
* - if we can't load "filename", try loading "filename.ml"
*/
/* Modified SWT Mon Jul 12 1982 Add variable-apropos */
/* $Header: /local/src/gosling-emacs/RCS/mlisp.c,v 1.3 1993/01/11 13:25:08 mogul Exp $ */
/* $Log: mlisp.c,v $
* Revision 1.3 1993/01/11 13:25:08 mogul
* Bug fixes for MIPS, Alpha
*
* Revision 1.2 1986/05/06 14:45:40 mcdaniel
* Merge Titan and Vax versions of emacs. GMcD.
*
* Revision 1.1 86/04/16 13:53:23 mcdaniel
* Initial revision
*
*/
#include "keyboard.h"
#include "macros.h"
#include "buffer.h"
#include "window.h"
#include "mlisp.h"
#include "config.h"
#include "search.h"
#include <ctype.h>
#include <sys/param.h>
char *malloc(),*realloc(), *getenv();
static int peekc, /* one character push-back */
temp;
static ForcedInteractive, /* true iff next ExecProg is interactive */
SingleStepExecute; /* if set, single step ExecProg */
struct ProgNode *StringNode(),*NumberNode(),*ParenNode(),*NameNode();
#define next (peekc?(temp=peekc,peekc=0,temp):(*ReadCharacter)())
/* ParseNode parses an MLisp program node and returns a pointer to it.
0 is returned if the parse was unsuccessful. Getc is a function to be
called to fetch the next character -- it should return -1 on errors. */
static struct ProgNode *
ParseNode(ReadCharacter)
int (*ReadCharacter)();
{
register int c;
while (isspace (c = next) && c >= 0);
return
c == '(' ? ParenNode (ReadCharacter) :
c == ';' ? (LispComment(ReadCharacter),
ParseNode(ReadCharacter)) :
c<0 ? ((peekc=c),
(struct ProgNode *) 0) :
c == ')' ? (peekc=c, (struct ProgNode *) 0) :
c == '"' ? StringNode (ReadCharacter) :
c == '\'' ||
c == '-' ||
isdigit (c) ? (peekc=c, NumberNode (ReadCharacter)) :
(peekc=c, NameNode (ReadCharacter));
}
/* LispComment handles lisp style comments */
LispComment(ReadCharacter)
int (*ReadCharacter)();
{
register int c;
while ((c = next) > 0 && c != '\n');
}
/* ParseName parses a name from the MLisp input stream */
static char *
ParseName(ReadCharacter)
int (*ReadCharacter)();
{
static char buf[200];
register char *p;
int c;
while (isspace (c = next));
p = buf;
while (c > 0 && !isspace (c) && c != '(' && c != ')' && c != ';') {
*p++ = c;
c = next;
}
peekc = c;
*p++ = 0;
return buf[0] ? buf : 0;
}
/* release the tree 'p' */
LispFree(p)
register struct ProgNode *p;
{
register int n;
if (p == 0 || p->p_active) /* Punt freeing actively executing
functions */
return;
for (n = 0; n < p -> p_nargs; n++)
LispFree (p -> p_args[n]);
free (p);
}
/* parse a parenthesised node */
struct ProgNode *
ParenNode(ReadCharacter)
int (*ReadCharacter)();
{
register int c;
register nargs = 0;
struct ProgNode *args[200]; /* alas, yet another hard-wired
limitation! */
char *name = ParseName (ReadCharacter);
register struct ProgNode *p;
register struct BoundName *who;
int ind;
if (name == (char *)0)
return 0;
ind = FindMac (name);
if (ind < 0) {
DefMac (name, 0, 1);
ind = FindMac (name);
if (ind < 0){
error ("Definition bogosity, defining %s", name);
return 0;
}
}
who = MacBodies[ind];
while (!err && (args[nargs] = ParseNode (ReadCharacter)))
nargs++;
if(peekc==')') peekc = 0;
if (peekc < 0)
error ("Unexpected EOF (parens mismatched?)");
p = (struct ProgNode *) malloc (sizeof *p + (nargs - 1) * sizeof p);
p -> p_proc = who;
p -> p_nargs = nargs;
while (--nargs >= 0)
p -> p_args[nargs] = args[nargs];
return p;
}
/* execute a number node */
ExecNumber () {
MLvalue -> exp_type = IsInteger;
MLvalue -> exp_int = (int) (CurExec -> p_args[0]);
return 0;
}
static struct BoundName BoundNumberNode;
static struct ProgNode *
NumberNode (ReadCharacter)
int (*ReadCharacter)();
{
register struct ProgNode *p = (struct ProgNode *) malloc (sizeof *p);
register int n = 0;
register int c = next;
if (c == '\'') {
char buf[30];
n = 0;
buf[0] = next;
while (n < 29 && ((buf[++n] = c = next) != '\''
|| n==1 && buf[0]=='\\'));
buf[n] = 0;
if (n>10) goto BadChar;
if (n == 1)
n = buf[0];
else
if (n == 2 && buf[0] == '^')
n = buf[1] & 037;
else
if (n == 2 && buf[0] == '\\' && !isdigit (buf[1]))
switch (buf[1]) {
default:
n = buf[1];
break;
case 'n':
n = '\n';
break;
case 'b':
n = '\b';
break;
case 't':
n = '\t';
break;
case 'r':
n = '\r';
break;
}
else
if (n > 1 && buf[0] == '\\') {
register char *p = buf + 1;
register char *lim = buf + n;
n = 0;
while (isdigit (c = *p++))
n = n * 8 + c - '0';
if (p <= lim)
goto BadChar;
}
else
BadChar:
error ("'%s' is an improper character constant.", buf);
}
else {
register neg = 0;
register base = 10;
if (c == '-')
neg++, c = next;
if (c == '0')
base = 8;
while (isdigit (c)) {
n = n * base + c - '0';
c = next;
}
if (neg)
n = -n;
peekc = c;
}
p -> p_proc = &BoundNumberNode;
p -> p_nargs = 0;
p -> p_args[0] = (struct ProgNode *) n;
return p;
}
static
ExecString () {
MLvalue -> exp_type = IsString;
MLvalue -> exp_int = (int) CurExec -> p_args[0];
MLvalue -> exp_v.v_string = (char *) & CurExec -> p_args[1];
return 0;
}
static struct BoundName BoundStringNode;
struct ProgNode *
StringNode (ReadCharacter)
int (*ReadCharacter)();
{
register char *p;
int c;
char buf[300];
register struct ProgNode *r;
p = buf;
while ((c = next) > 0) {
if (c == '\\')
switch (c = next) {
case 'n':
c = '\n';
break;
case 'b':
c = '\b';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'e':
c = '\033';
break;
case '^':
c = next & 037;
break;
default:
if ('0'<=c && c<='7') {
register nc = 0;
register cnt = 3;
do nc = nc*8 + c-'0';
while (--cnt>0 && '0'<=(c=next) && c<='7');
if (cnt>0) peekc = c;
c = nc;
}
}
else if (c == '"' && (c = next) != '"') {
peekc = c;
break;
}
if (p >= &buf[sizeof buf / sizeof buf[0]]) {
error ("Unterminated string constant");
return 0;
}
*p++ = c;
}
*p++ = '\0';
r = (struct ProgNode *) malloc (sizeof *r + p - buf);
r -> p_proc = &BoundStringNode;
r -> p_nargs = 0;
r -> p_args[0] = (struct ProgNode *) (p - buf - 1);
strcpyn ((char *)(r -> p_args + 1), buf, p - buf);
return r;
}
/* ACT 17-Oct-1982 upgraded for single-step */
ExecProg (p)
register struct ProgNode *p;
{
struct ProgNode *old = CurExec;
int OldLastArg = LastArgUsed;
int OldSingleStep = SingleStepExecute;
register rv = 0;
register int WasActive;
if (err)
return 0;
ReleaseExpr (MLvalue);
MLvalue = &GlobalValue;
GlobalValue.exp_type = IsVoid;
if (p == 0) {
if (old)
error ("\"%s\" has not been defined yet.",
old -> p_proc -> b_name);
else
error ("Attempt to execute an undefined MLisp function.");
return 0;
}
if (SingleStepExecute & 2) {
register struct buffer *b = bf_cur;
SetBfn ("Trace Buffer");
InsCStr ("About to execute \"", 18);
InsStr (p -> p_proc -> b_name);
InsCStr ("\"", 1);
SetBfp (b);
}
if (SingleStepExecute & 1) {
retell:
CurExec = 0;
message ("Single Step Mode: about to execute \"%s\"",
p -> p_proc -> b_name);
again:
switch (GetChar ()) {
case ' ':
break;
case '!':
OldSingleStep = 0;
case 's':
SingleStepExecute = 0;
break;
case 'r':
CurExec = old;
SingleStepExecute = 0;
RecursiveEdit ();
SingleStepExecute = 1;
goto retell;
case 'x':
SingleStepExecute = 0;
ExecuteExtendedCommand ();
SingleStepExecute = 1;
goto again;
case (Ctl ('G')):
if (SingleStepExecute & 2) {
register struct buffer *b = bf_cur;
SetBfn ("Trace Buffer");
InsCStr (" Aborted\n", 9);
SetBfp (b);
}
goto out;
case '=':
goto retell;
default:
message ("Options: ' '=>step; 's'=>superstep; 'r'=>recursive edit; '!'=>go; '^G'=>skip");
goto again;
}
/* This message only comes out if no one overwrites it */
message ("Single Step Done");
}
if (SingleStepExecute & 2) {
register struct buffer *b = bf_cur;
SetBfn ("Trace Buffer");
InsCStr ("\n", 1);
SetBfp (b);
}
WasActive = p->p_active;
p->p_active = 1;
CurExec = ForcedInteractive ? 0 : p;
ForcedInteractive = 0;
LastArgUsed = -1;
rv = ExecuteBound (p -> p_proc);
p->p_active = WasActive;
LastArgUsed = OldLastArg;
out:
CurExec = old;
ForcedInteractive = 0; /* yes, you need this one too */
SingleStepExecute = OldSingleStep;
return rv;
}
static bufpos;
static char getbufc () {
register char c;
if (bufpos > NumCharacters)
return - 1;
c = CharAt (bufpos);
bufpos++;
return c;
}
ExecuteMLispBuffer () {
int rv;
bufpos = 1;
rv = ExecuteMLispSomething (getbufc);
if(err) SetDot (bufpos-1);
return rv;
}
static char MLline[200];
static char
GetLineChar () {
return MLline[bufpos] ? MLline[bufpos++] : -1;
}
ExecuteMLispLine () {
register char *s = getstr (": execute-mlisp-line ");
int rv = 0;
if (s) {
bufpos = 0;
strcpyn (MLline, s, sizeof MLline / sizeof MLline[0]);
rv = ExecuteMLispSomething (GetLineChar);
if (interactive) {
if (MLvalue -> exp_type == IsInteger)
message ("%s => %d", MLline, MLvalue -> exp_int);
else
if (MLvalue -> exp_type == IsString)
message ("%s => \"%s\"", MLline, MLvalue -> exp_v.v_string);
ReleaseExpr (MLvalue);
MLvalue -> exp_type = IsVoid;
}
}
return rv;
}
static struct BoundName *ProgNblock;
static struct BoundName BoundVariableNode;
ProgN () {
register struct ProgNode *p = CurExec;
int i,
rv = 0;
if (p == 0)
error ("progn can only appear in mlisp statements");
else {
register struct VariableName *v;
register struct Binding *b;
for (i = 0; i < p -> p_nargs && p -> p_args[i] -> p_proc == &BoundVariableNode; i++)
Declare (p -> p_args[i] -> p_args[0], 0);
while (!err && rv == 0 && i < p -> p_nargs)
rv = ExecProg (p -> p_args[i++]);
for (i = 0; i < p -> p_nargs && p -> p_args[i] -> p_proc == &BoundVariableNode; i++) {
v = (struct VariableName *) (p -> p_args[i] -> p_args[0]);
b = v -> v_binding;
ReleaseExpr (b->b_exp);
free (b->b_exp);
b = b -> b_inner;
free (v -> v_binding);
v -> v_binding = b;
}
}
return rv;
}
static
DeclareGlobal () {
if (CurExec == 0)
error ("declare-global can only appear in mlisp statements");
else
PerformDeclare (0);
return 0;
}
static
DeclareBufferSpecific () {
if (CurExec == 0)
error ("declare-buffer-specific can only appear in mlisp statements");
else
PerformDeclare (1);
return 0;
}
static
PerformDeclare (BufferSpecific) {
register struct ProgNode *p = CurExec;
register i;
register struct VariableName *v;
register struct Binding *b;
for (i = 0; i < p -> p_nargs
&& p -> p_args[i] -> p_proc == &BoundVariableNode; i++) {
v = (struct VariableName *) (p -> p_args[i] -> p_args[0]);
if (v -> v_binding == 0 || BufferSpecific)
Declare (v, BufferSpecific);
}
}
Declare (v, BufferSpecific)
register struct VariableName *v; {
register struct Binding *b;
if (v -> v_binding == 0 || !BufferSpecific) {
b = (struct Binding *) malloc (sizeof *b);
b -> b_exp = (Expression *) malloc (sizeof (Expression));
b -> b_exp -> exp_type = IsInteger;
b -> b_exp -> exp_refcnt = 1;
b -> b_exp -> exp_int = 0;
b -> b_exp -> exp_v.v_string = (char *) - 1;
b -> b_inner = v -> v_binding;
v -> v_binding = b;
b -> IsSystem = 0;
}
else {
b = v -> v_binding;
while (b -> b_inner)
b = b -> b_inner;
if (b -> IsSystem)
return;
}
b -> BufferSpecific = BufferSpecific;
b -> IsDefault = BufferSpecific;
}
static
IsBound () {
register struct ProgNode *p = CurExec;
int i;
if (p == 0)
error ("is-bound can only appear in mlisp statements");
else {
register struct VariableName *v;
register struct Binding *b;
MLvalue -> exp_type = IsInteger;
MLvalue -> exp_int = 1;
for (i = 0; i < p -> p_nargs && p -> p_args[i] -> p_proc == &BoundVariableNode; i++) {
v = (struct VariableName *) (p -> p_args[i] -> p_args[0]);
if (!v -> v_binding) {
MLvalue -> exp_int = 0;
break;
}
}
}
return 0;
}
static
ErrorOccured () {
register rv = ProgN ();
ReleaseExpr (MLvalue);
MLvalue -> exp_type = IsInteger;
MLvalue -> exp_int = err!=0;
err = 0;
MiniBuf = "";
return rv;
}
static
PrefixArgumentLoop () {
register int rv = 0;
register int ctr = ExecutionRoot.PrefixArgument;
while (--ctr>=0 && !err && rv==0)
rv = ProgN ();
return rv;
}
int dbg_layout; /* for a while, anyway */
static
SaveWindowExcursion ()
{
#define SaveSize 30
int WinSize[SaveSize], rv, current = -1;
register k,
nsaved;
struct marker * WinMark[SaveSize],
* WinTop[SaveSize];
register struct window *w, *nextw;
register struct buffer *old = bf_cur;
for (nsaved = 0, w = windows; w->w_next && nsaved < SaveSize;
w = w->w_next, nsaved++)
{
WinSize[nsaved] = w->w_height;
if (w == wn_cur)
current = nsaved;
WinMark[nsaved] = NewMark();
SetMark(WinMark[nsaved], w->w_buf, ToMark(w->w_dot));
WinTop[nsaved] = NewMark();
SetMark(WinTop[nsaved], w->w_buf, ToMark(w->w_start));
if (dbg_layout)
fprintf (stderr, "window %d, height %d, dot %d, st %d\n\r",
nsaved,w->w_height, ToMark(w->w_dot), ToMark(w->w_start));
}
rv = SaveExcursion ();
k = 0;
for (w = windows; nextw = w->w_next; w = nextw)
{
if (k >= nsaved)
DelWin (w);
k++;
}
while (k < nsaved)
{
SplitLargestWindow ();
k++;
}
for (k = 0, w = windows; k < nsaved; k++, w = w->w_next)
{
ChgWHeight (w, WinSize[k] - w->w_height, 0);
TieWin (w, WinTop[k] -> m_buf);
/* Position first line in window */
SetMark (w->w_start, w->w_buf, ToMark(WinTop[k]));
DestMark( WinTop[k] );
dot = ToMark(WinMark[k]);
SetMark(w->w_dot, w->w_buf, dot);
DestMark(WinMark[k]);
if (dbg_layout)
fprintf (stderr, "Set size for window %d (buf %s) to %d, dot %d\n\r",
k, w->w_buf->b_name, w->w_height, dot);
}
if (current == -1)
{
for ( w = windows; w->w_next; w = w->w_next )
;
SetWin(w); /* in minibuffer */
}
else
for (k=0, w=windows; k < nsaved; k++, w = w->w_next)
if (k == current)
SetWin (w);
return rv;
}
static
OldSaveWindowExcursion () {
/*#define SaveSize 20*/
struct buffer *SavedBuffers[SaveSize];
char StillVisible[SaveSize];
char HasGood[SaveSize];
register i,
nsaved = 0;
register struct window *w;
register struct buffer *old = bf_cur;
int rv,
k;
int BufferVisible = wn_cur -> w_buf == bf_cur;
for (w = windows; w -> w_next; w = w -> w_next) {
for (i = 0; i < nsaved && SavedBuffers[i] != w -> w_buf; i++);
if (i >= nsaved)
SavedBuffers[nsaved++] = w -> w_buf;
}
for (i = 0; i < nsaved; i++)
StillVisible[i] = 0;
rv = SaveExcursion ();
k = 0;
for (w = windows; w -> w_next; w = w -> w_next) {
HasGood[k] = 0;
for (i = 0; i < nsaved; i++)
if (SavedBuffers[i] == w -> w_buf)
StillVisible[i]++, HasGood[k]++;
k++;
}
k = 0;
for (w = windows; w -> w_next;) {
register struct window *nextw = w -> w_next;
if (!HasGood[k]) {
for (i = 0; i < nsaved; i++)
if (!StillVisible[i]) {
StillVisible[i]++;
TieWin (w, SavedBuffers[i]);
break;
}
if (i >= nsaved)
DelWin (w);
}
k++;
w = nextw;
}
for (i = 0; i < nsaved; i++)
if (!StillVisible[i]) {
SplitLargestWindow ();
WindowOn (SavedBuffers[i]);
}
SetBfp (old);
if (BufferVisible)
WindowOn (bf_cur);
return rv;
}
static
SaveExcursion () {
register struct marker *olddot = NewMark ();
register struct marker *oldmark = 0;
register struct buffer *oldbuf = bf_cur;
int BufferVisible = wn_cur->w_buf == bf_cur;
register rv;
struct search_globals lglobals;
SetMark (olddot, bf_cur, dot);
if (bf_cur -> b_mark) {
oldmark = NewMark ();
SetMark (oldmark, bf_cur, ToMark (bf_cur -> b_mark));
}
lglobals = search_globals;
rv = ProgN ();
search_globals = lglobals;
SetBfp (oldbuf);
if(BufferVisible) WindowOn (bf_cur);
dot = ToMark (olddot);
if (oldmark) {
SetMark (bf_cur -> b_mark, bf_cur, ToMark (oldmark));
DestMark (oldmark);
}
DestMark (olddot);
return rv;
}
static
If () {
register i;
if (CheckArgs (2, 0))
return 0;
for (i = 0; !err && i + 1 < CurExec -> p_nargs; i += 2)
if (NumericArg (i + 1))
return ExecProg (CurExec -> p_args[i + 1]);
return !err && i < CurExec -> p_nargs
? ExecProg (CurExec -> p_args[i]) : 0;
}
static
While () {
register i, rv = 0;
if (CheckArgs (2, 0))
return 0;
while (!err && rv==0
&& (rv=ExecProg (CurExec -> p_args[0]))==0
&& MLvalue -> exp_type == IsInteger
&& MLvalue -> exp_int
&& !err)
for (i = 1; rv==0 && i < CurExec -> p_nargs && !err; i++)
rv = ExecProg (CurExec -> p_args[i]);
return rv;
}
static
InsertString () {
if (CurExec) {
register i = 1;
while (i <= CurExec -> p_nargs && StringArg (i)) {
InsCStr (MLvalue -> exp_v.v_string, MLvalue -> exp_int);
i++;
}
}
else {
register char *s = getstr (": insert-string ");
if (s == 0)
return 0;
InsStr (s);
}
return 0;
}
static
Message () {
Concat ();
if (err)
return 0;
CurExec = 0;
if(!err)
message ("%s", MLvalue -> exp_v.v_string);
VoidResult ();
return 0;
}
static
SendStringToTerminal () {
register char *s = getstr (": send-string-to-terminal ");
if(s) printf ("%s", s);
VoidResult ();
return 0;
}
static
ErrorMessage () {
Concat ();
if (err)
return 0;
error ("%s", MLvalue -> exp_v.v_string);
VoidResult ();
return 0;
}
static
ExecuteMLispSomething (ReadCharacter)
int (*ReadCharacter)();
{
register struct ProgNode *p;
int rv;
peekc = 0;
if ((p = ParseNode (ReadCharacter)) == 0)
return;
rv = ExecProg (p);
LispFree (p);
return rv;
}
static FILE *MLispIn;
static ReadMLispFileCharacter() {
return getc(MLispIn);
}
ExecuteMLispFile (fn, MissingOK)
char *fn;
{
static char *path;
register int c;
char fnb[MAXPATHLEN];
FILE * old = MLispIn;
register rv = 0;
if (path == 0) {
FluidStatic(&path, sizeof(path));
path = (char *) getenv ("EPATH");
if (path == 0)
path = PATH_LOADSEARCH;
}
peekc = 0;
if ((MLispIn = fopenp (path, fn, fnb, "r")) == NULL){
/* couldn't open fn; let's try fn.ml */
char Xfn[MAXPATHLEN];
strcpy(Xfn,fn);
strcat(Xfn,".ml");
MLispIn = fopenp (path, Xfn, fnb, "r");
}
if (MLispIn == NULL) {
/* still null? Guess file isn't there */
if(!MissingOK) error ("Can't read %s", fn);
rv++;
peekc = -1;
}
else
peekc = getc (MLispIn);
if (peekc == '\033')
LoadFile (fn);
else
while (peekc >= 0 && !err) {
register struct ProgNode *p;
p = ParseNode (ReadMLispFileCharacter);
if (p == 0)
break;
ExecProg (p);
LispFree (p);
while (isspace (c = getc (MLispIn)) && c > 0);
peekc = c;
};
if (MLispIn)
fclose (MLispIn);
MLispIn = old;
return rv | err;
}
static
ExecuteMLispFileTOP () {
register char *s = getstr(": execute-mlisp-file ");
if(s) ExecuteMLispFile (s, 0);
}
/* release the storage associated with an expression */
DoRelease (e)
register Expression *e; {
if (e -> exp_release) {
switch (e -> exp_type) {
case IsString:
free (e -> exp_v.v_string);
e -> exp_v.v_string = 0;
default:
break;
case IsMarker:
DestMark (e -> exp_v.v_marker);
e -> exp_v.v_marker = 0;
break;
}
e -> exp_release = 0;
}
}
static
DefineFunction () {
register struct ProgNode *p;
register struct BoundName *b;
register int i;
if (CheckArgs (1, 0))
return 0;
for (i = 0; i < CurExec -> p_nargs; i++)
if (p = CurExec -> p_args[i]) {
CurExec -> p_args[i] = 0;
b = p -> p_proc;
if (b -> b_binding == MLispBound)
LispFree (b -> b_bound.b_prog);
else
if (b -> b_binding == MacroBound
|| b -> b_binding == AutoLoadBound) {
free (b -> b_bound.b_body);
b -> b_binding = MLispBound;
}
else {
error ("\"%s\" is bound to a wired procedure and cannot be rebound!", b -> b_name);
continue;
}
b -> b_bound.b_prog = p;
p -> p_proc = ProgNblock;
}
return 0;
}
struct VariableName *Lookup (name)
char *name;
{
register i;
char *p1,
*p2;
for (i = 0; i < NVars; i++) {
p1 = VarNames[i];
p2 = name;
while (*p2 && *p1 == *p2)
p1++, p2++;
if ((*p1 | *p2) == 0) /* *p1==0 && *p2==0 */
return VarDesc[i];
}
return 0;
}
static /* define a varible name given the string
name and a pointer to the descriptor
record */
Define(name,desc)
char *name;
struct VariableName *desc;
{
if (NVars >= VarTSize-1) /* enlarge the string table */
if (VarTSize==0) {
VarNames = (char **) malloc ((VarTSize = 50) * sizeof *VarNames);
VarDesc = (struct VariableName **)
malloc (VarTSize * sizeof *VarDesc);
}
else {
VarNames = (char **)
realloc((char *)VarNames,(VarTSize += 50)*sizeof *VarNames);
VarDesc = (struct VariableName **)
realloc ((char *)VarDesc, VarTSize * sizeof *VarDesc);
}
VarNames[NVars] = name;
VarDesc[NVars] = desc;
NVars++;
VarDesc[NVars] = 0;
VarNames[NVars] = 0;
}
static struct ProgNode * /* parse a name token in an MLisp program */
NameNode (ReadCharacter)
int (*ReadCharacter)(); {
register struct ProgNode *p = (struct ProgNode *) malloc (sizeof *p);
register char *name = ParseName (ReadCharacter);
register struct VariableName *v;
if ((v = Lookup (name)) == 0) {
v = (struct VariableName *) malloc (sizeof *v);
Define (v -> v_name = savestr (name), v);
v -> v_binding = 0;
}
p -> p_nargs = 0;
p -> p_args[0] = (struct ProgNode *) v;
p -> p_proc = &BoundVariableNode;
return p;
}
struct Binding *ResolveBufferSpecific (b)
register struct Binding *b; {
if (b -> BufferSpecific) {
while (b && !b -> IsDefault && b -> BufferSpecific
&& b -> b.b_LocalTo != bf_cur)
b = b -> b_inner;
if (!b || !b -> BufferSpecific) {
error ("Error resolving buffer-specific variable (internal error)");
return 0; /* This should never happen! */
}