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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <error.h>
include <evexpr.h>
include <imset.h>
include <imhdr.h>
include <ctype.h>
include <lexnum.h>
define LEN_USERAREA 28800 # allow for the largest possible header
define SZ_IMAGENAME 63 # max size of an image name
define SZ_FIELDNAME 31 # max size of a field name
define DEBUG FALSE
# IMX_MATCHEXPR -- Match the open image descriptor against the expression.
bool procedure imx_matchexpr (im, expr)
pointer im #I image descriptor
char expr[ARB] #I expression string
bool stat
char val[SZ_LINE]
pointer o
pointer imt_im # getop common
char imt_image[SZ_IMAGENAME]
char imt_field[SZ_FIELDNAME]
common /imtgop/ imt_im, imt_image, imt_field
pointer evexpr()
extern imx_getop()
int locpr()
errchk locpr, evexpr
begin
call aclrc (val, SZ_LINE)
call aclrc (imt_image, SZ_IMAGENAME)
call aclrc (imt_field, SZ_FIELDNAME)
imt_im = im
if (expr[1] != EOS) {
iferr {
o = evexpr (expr, locpr (imx_getop), 0)
call imx_encodeop (o, val, SZ_LINE)
stat = O_VALB(o)
call xev_freeop (o)
call mfree (o, TY_STRUCT)
} then
stat = FALSE
if (DEBUG) {
call eprintf ("expr = '%s' %b\n")
call pargstr (expr) ; call pargb (stat)
}
return (stat)
}
return (FALSE)
end
# IMX_SIFMATCH -- Check whether the file is a simple image matching the
# expression.
bool procedure imx_sifmatch (fname, expr)
char fname[ARB] #I image name
char expr[ARB] #I expression string
pointer im
bool stat
pointer immap()
bool imx_matchexpr (), streq()
errchk immap
begin
if (expr[1] == EOS)
return (TRUE)
iferr (im = immap (fname, READ_ONLY, 0)) {
return (FALSE)
}
if (streq (expr, "yes"))
stat = TRUE
else
stat = imx_matchexpr (im, expr)
call imunmap (im)
return (stat)
end
# IMX_GETOP -- Satisfy an operand request from EVEXPR. In this context,
# operand names refer to the fields of the image header. The following
# special operand names are recognized:
#
# . a string literal, returned as the string "."
# $ the value of the current field
# $F the name of the current field
# $I the name of the current image
# $T the current time, expressed as an integer
#
# The companion procedure HE_GETOPSETIMAGE is used to pass the image pointer
# and image and field names.
procedure imx_getop (operand, o)
char operand[ARB] # operand name
pointer o # operand (output)
pointer imt_im # getop common
char imt_image[SZ_IMAGENAME]
char imt_field[SZ_FIELDNAME]
common /imtgop/ imt_im, imt_image, imt_field
bool streq()
long clktime()
errchk imx_getfield
begin
if (streq (operand, ".")) {
call xev_initop (o, 1, TY_CHAR)
call strcpy (".", O_VALC(o), 1)
} else if (streq (operand, "$")) {
call imx_getfield (imt_im, imt_field, o)
} else if (streq (operand, "$F")) {
call xev_initop (o, SZ_FIELDNAME, TY_CHAR)
call strcpy (imt_field, O_VALC(o), SZ_FIELDNAME)
} else if (streq (operand, "$I")) {
call xev_initop (o, SZ_IMAGENAME, TY_CHAR)
call strcpy (imt_image, O_VALC(o), SZ_IMAGENAME)
} else if (streq (operand, "$T")) {
# Assignment of long into int may fail on some systems. Maybe
# should use type string and let database convert to long...
call xev_initop (o, 0, TY_INT)
O_VALI(o) = clktime (long(0))
} else
call imx_getfield (imt_im, operand, o)
end
# IMX_GETFIELD -- Return the value of the named field of the image header as
# an EVEXPR type operand structure.
procedure imx_getfield (im, field, o)
pointer im # image descriptor
char field[ARB] # name of field to be returned
pointer o # pointer to output operand
bool imgetb()
int ftype, imgeti(), imgftype()
real imgetr()
begin
iferr {
ftype = imgftype (im, field)
} then {
call xev_initop (o, SZ_LINE, TY_CHAR) # keyword not found
call aclrc (O_VALC(o), SZ_LINE)
return
}
switch (ftype) {
case TY_BOOL:
call xev_initop (o, 0, TY_BOOL)
O_VALB(o) = imgetb (im, field)
case TY_SHORT, TY_INT, TY_LONG:
call xev_initop (o, 0, TY_INT)
O_VALI(o) = imgeti (im, field)
case TY_REAL, TY_DOUBLE, TY_COMPLEX:
call xev_initop (o, 0, TY_REAL)
O_VALR(o) = imgetr (im, field)
default:
call xev_initop (o, SZ_LINE, TY_CHAR)
call imgstr (im, field, O_VALC(o), SZ_LINE)
}
end
# IMX_ENCODEOP -- Encode an operand as returned by EVEXPR as a string. EVEXPR
# operands are restricted to the datatypes bool, int, real, and string.
procedure imx_encodeop (o, outstr, maxch)
pointer o # operand to be encoded
char outstr[ARB] # output string
int maxch # max chars in outstr
begin
switch (O_TYPE(o)) {
case TY_BOOL:
call sprintf (outstr, maxch, "%b")
call pargb (O_VALB(o))
case TY_CHAR:
call sprintf (outstr, maxch, "%s")
call pargstr (O_VALC(o))
case TY_INT:
call sprintf (outstr, maxch, "%d")
call pargi (O_VALI(o))
case TY_REAL:
call sprintf (outstr, maxch, "%g")
call pargr (O_VALR(o))
default:
call error (1, "unknown expression datatype")
}
end
|
