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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <error.h>
include <ctype.h>
include <pkg/rg.h>
define NRGS 10 # Allocation size
# RG_XRANGES -- Parse a range string corrsponding to a real set of values.
# Return a pointer to the ranges.
pointer procedure rg_xranges$t (rstr, rvals, npts)
char rstr[ARB] # Range string
PIXEL rvals[npts] # Range values (sorted)
int npts # Number of range values
pointer rg # Range pointer
int i, fd, strlen(), open(), getline()
pointer sp, str, ptr
errchk open, rg_xadd$t
begin
# Check for valid arguments
if (npts < 1)
call error (0, "No data points for range determination")
call smark (sp)
call salloc (str, max (strlen (rstr), SZ_LINE), TY_CHAR)
call calloc (rg, LEN_RG, TY_STRUCT)
i = 1
while (rstr[i] != EOS) {
# Find beginning and end of a range and copy it to the work string
while (IS_WHITE(rstr[i]) || rstr[i]==',' || rstr[i]=='\n')
i = i + 1
if (rstr[i] == EOS)
break
ptr = str
while (!(IS_WHITE(rstr[i]) || rstr[i]==',' || rstr[i]=='\n' ||
rstr[i]==EOS)) {
Memc[ptr] = rstr[i]
i = i + 1
ptr = ptr + 1
}
Memc[ptr] = EOS
# Add range(s)
iferr {
if (Memc[str] == '@') {
fd = open (Memc[str+1], READ_ONLY, TEXT_FILE)
while (getline (fd, Memc[str]) != EOF) {
iferr (call rg_xadd$t (rg, Memc[str], rvals, npts))
call erract (EA_WARN)
}
call close (fd)
} else
call rg_xadd$t (rg, Memc[str], rvals, npts)
} then
call erract (EA_WARN)
}
call sfree (sp)
return (rg)
end
# RG_XADD -- Add a range
procedure rg_xadd$t (rg, rstr, rvals, npts)
pointer rg # Range descriptor
char rstr[ARB] # Range string
PIXEL rvals[npts] # Range values (sorted)
int npts # Number of range values
int i, j, k, nrgs, strlen(), cto$t()
PIXEL rval1, rval2, a1, b1, a2, b2
pointer sp, str, ptr
begin
call smark (sp)
call salloc (str, strlen (rstr), TY_CHAR)
i = 1
while (rstr[i] != EOS) {
# Find beginning and end of a range and copy it to the work string
while (IS_WHITE(rstr[i]) || rstr[i]==',' || rstr[i]=='\n')
i = i + 1
if (rstr[i] == EOS)
break
ptr = str
while (!(IS_WHITE(rstr[i]) || rstr[i]==',' || rstr[i]=='\n' ||
rstr[i]==EOS)) {
if (rstr[i] == ':')
Memc[ptr] = ' '
else
Memc[ptr] = rstr[i]
i = i + 1
ptr = ptr + 1
}
Memc[ptr] = EOS
# Parse range
if (Memc[str] == '@')
call error (1, "Cannot nest @files")
else if (Memc[str] == '*') {
rval1 = rvals[1]
rval2 = rvals[npts]
} else {
# Get range
j = 1
if (cto$t (Memc[str], j, rval1) == 0)
call error (1, "Range syntax error")
rval2 = rval1
if (cto$t (Memc[str], j, rval2) == 0)
;
}
# Check limits and find indices into rval array
a1 = min (rval1, rval2)
b1 = max (rval1, rval2)
a2 = min (rvals[1], rvals[npts])
b2 = max (rvals[1], rvals[npts])
if ((b1 >= a2) && (a1 <= b2)) {
a1 = max (a2, min (b2, a1))
b1 = max (a2, min (b2, b1))
if (rvals[1] <= rvals[npts]) {
for (k = 1; (k <= npts) && (rvals[k] < a1); k = k + 1)
;
for (j = k; (j <= npts) && (rvals[j] <= b1); j = j + 1)
;
j = j - 1
} else {
for (k = 1; (k <= npts) && (rvals[k] > b1); k = k + 1)
;
for (j = k; (j <= npts) && (rvals[j] >= a1); j = j + 1)
;
j = j - 1
}
# Add range
if (k <= j) {
nrgs = RG_NRGS(rg)
if (mod (nrgs, NRGS) == 0)
call realloc (rg, LEN_RG+2*(nrgs+NRGS), TY_STRUCT)
nrgs = nrgs + 1
RG_NRGS(rg) = nrgs
RG_X1(rg, nrgs) = k
RG_X2(rg, nrgs) = j
RG_NPTS(rg) = RG_NPTS(rg) +
RG_X1(rg, nrgs) - RG_X2(rg, nrgs) + 1
}
}
}
call sfree (sp)
end
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