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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_xrangesr (rstr, rvals, npts)
char rstr[ARB] # Range string
real 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_xaddr
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_xaddr (rg, Memc[str], rvals, npts))
call erract (EA_WARN)
}
call close (fd)
} else
call rg_xaddr (rg, Memc[str], rvals, npts)
} then
call erract (EA_WARN)
}
call sfree (sp)
return (rg)
end
# RG_XADD -- Add a range
procedure rg_xaddr (rg, rstr, rvals, npts)
pointer rg # Range descriptor
char rstr[ARB] # Range string
real rvals[npts] # Range values (sorted)
int npts # Number of range values
int i, j, k, nrgs, strlen(), ctor()
real 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 (ctor (Memc[str], j, rval1) == 0)
call error (1, "Range syntax error")
rval2 = rval1
if (ctor (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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