1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/* xlsubr - xlisp builtin function support routines */
/* Copyright (c) 1985, by David Michael Betz
All Rights Reserved
Permission is granted for unrestricted non-commercial use */
/* CHANGE LOG
* --------------------------------------------------------------------
* 28Apr03 dm eliminate some compiler warnings
*/
#include "string.h"
#include "xlisp.h"
/* external variables */
extern LVAL k_test,k_tnot,s_eql;
/* xlsubr - define a builtin function */
LVAL xlsubr(const char *sname, int type, LVAL (*fcn)(void), int offset)
{
LVAL sym;
sym = xlenter(sname);
setfunction(sym,cvsubr(fcn,type,offset));
return (sym);
}
/* xlgetkeyarg - get a keyword argument */
int xlgetkeyarg(LVAL key, LVAL *pval)
{
LVAL *argv=xlargv;
int argc=xlargc;
for (argv = xlargv, argc = xlargc; (argc -= 2) >= 0; argv += 2) {
if (*argv == key) {
*pval = *++argv;
return (TRUE);
}
}
return (FALSE);
}
/* xlgkfixnum - get a fixnum keyword argument */
int xlgkfixnum(LVAL key, LVAL *pval)
{
if (xlgetkeyarg(key,pval)) {
if (!fixp(*pval))
xlbadtype(*pval);
return (TRUE);
}
return (FALSE);
}
/* xltest - get the :test or :test-not keyword argument */
void xltest(LVAL *pfcn, int *ptresult)
{
if (xlgetkeyarg(k_test,pfcn)) /* :test */
*ptresult = TRUE;
else if (xlgetkeyarg(k_tnot,pfcn)) /* :test-not */
*ptresult = FALSE;
else {
*pfcn = getfunction(s_eql);
*ptresult = TRUE;
}
}
/* xlgetfile - get a file or stream */
LVAL xlgetfile(void)
{
LVAL arg;
/* get a file or stream (cons) or nil */
if ((arg = xlgetarg())) {
if (streamp(arg)) {
if (getfile(arg) == NULL)
xlfail("file not open");
}
else if (!ustreamp(arg))
xlerror("bad argument type",arg);
}
return (arg);
}
/* xlgetfname - get a filename */
LVAL xlgetfname(void)
{
LVAL name;
/* get the next argument */
name = xlgetarg();
/* get the filename string */
if (symbolp(name))
name = getpname(name);
else if (!stringp(name))
xlerror("bad argument type",name);
/* return the name */
return (name);
}
/* needsextension - check if a filename needs an extension */
int needsextension(const char *name)
{
const char *p;
/* check for an extension */
for (p = &name[strlen(name)]; --p >= &name[0]; )
if (*p == '.')
return (FALSE);
else if (!islower(*p) && !isupper(*p) && !isdigit(*p))
return (TRUE);
/* no extension found */
return (TRUE);
}
/* the next three functions must be declared as LVAL because they
* are used in LVAL expressions, but they do not return anything
* warning 4035 is "no return value"
*/
/* #pragma warning(disable: 4035) */
/* xlbadtype - report a "bad argument type" error */
LVAL xlbadtype(LVAL arg)
{
xlerror("bad argument type",arg);
return NIL; /* never happens */
}
/* xltoofew - report a "too few arguments" error */
LVAL xltoofew(void)
{
xlfail("too few arguments");
return NIL; /* never happens */
}
/* xltoomany - report a "too many arguments" error */
LVAL xltoomany(void)
{
xlfail("too many arguments");
return NIL; /* never happens */
}
/* eq - internal eq function */
int eq(LVAL arg1, LVAL arg2)
{
return (arg1 == arg2);
}
/* eql - internal eql function */
int eql(LVAL arg1, LVAL arg2)
{
/* compare the arguments */
if (arg1 == arg2)
return (TRUE);
else if (arg1) {
switch (ntype(arg1)) {
case FIXNUM:
return (fixp(arg2) ? getfixnum(arg1)==getfixnum(arg2) : FALSE);
case FLONUM:
return (floatp(arg2) ? getflonum(arg1)==getflonum(arg2) : FALSE);
default:
return (FALSE);
}
}
else
return (FALSE);
}
/* lval_equal - internal equal function */
int lval_equal(LVAL arg1, LVAL arg2)
{
/* compare the arguments */
if (arg1 == arg2)
return (TRUE);
else if (arg1) {
switch (ntype(arg1)) {
case FIXNUM:
return (fixp(arg2) ? getfixnum(arg1)==getfixnum(arg2) : FALSE);
case FLONUM:
return (floatp(arg2) ? getflonum(arg1)==getflonum(arg2) : FALSE);
case STRING:
return (stringp(arg2) ? strcmp((char *) getstring(arg1),
(char *) getstring(arg2)) == 0 : FALSE);
case CONS:
return (consp(arg2) ? lval_equal(car(arg1),car(arg2))
&& lval_equal(cdr(arg1),cdr(arg2)) : FALSE);
default:
return (FALSE);
}
}
else
return (FALSE);
}
|
