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
|
#include <stdlib.h>
#define import_spp
#define import_knames
#include <iraf.h>
#ifdef INT32_SUM
/**
* STRSUM -- Compute the 32-bit checksum of an SPP string.
*/
int
STRSUM (XCHAR *array, XINT *length, XINT *maxch)
{
int i, len, carry=0, newcarry=0;
unsigned int *iarray, sum = 0;
char pkstr[*maxch];
register int n = *maxch;
register XCHAR *ip = array;
register char *op = (char *) pkstr;
/* Convert the input string to a packed char array.
*/
while ((*op++ = *ip++) != XEOS && --n >= 0)
;
*--op = EOS;
/* Compute the checksum.
*/
iarray = (unsigned int *) pkstr;
len = *length / 4;
for (i=0; i<len; i++) {
if (iarray[i] > ~ sum)
carry++;
sum += iarray[i];
}
while (carry) {
if (carry > ~ sum)
newcarry++;
sum += carry;
carry = newcarry;
newcarry = 0;
}
return (sum);
}
#else
/**
* STRSUM -- Compute the 32-bit checksum of an SPP string.
*/
int
STRSUM (XCHAR *array, XINT *length, XINT *maxch)
{
int i, len, carry=0, newcarry=0;
unsigned int *iarray, sum = 0;
unsigned long lsum = 0;
char pkstr[*maxch];
register int n = *maxch;
register XCHAR *ip = array;
register char *op = (char *) pkstr;
/* Convert the input string to a packed char array.
*/
while ((*op++ = *ip++) != XEOS && --n >= 0)
;
*--op = EOS;
/* Compute the checksum.
*/
iarray = (unsigned int *) pkstr;
len = *length / 4;
for (i=0; i<len; i++) {
if (iarray[i] > ~ lsum)
carry++;
lsum += iarray[i];
}
while (carry) {
if (carry > ~ lsum)
newcarry++;
lsum += carry;
carry = newcarry;
newcarry = 0;
}
return (abs(sum = lsum));
}
#endif
|
