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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <ctype.h>
define FIRST 1 # Default starting range
define LAST MAX_INT # Default ending range
define STEP 1 # Default step
# DECODE_RANGES -- Parse a string containing a list of integer numbers or
# ranges, delimited by either spaces or commas. Return as output a list
# of ranges defining a list of numbers, and the count of list numbers.
# Range limits must be positive nonnegative integers. ERR is returned as
# the function value if a conversion error occurs. The list of ranges is
# delimited by a single NULL.
int procedure decode_ranges (range_string, ranges, max_ranges, nvalues)
char range_string[ARB] # Range string to be decoded
int ranges[3, max_ranges] # Range array
int max_ranges # Maximum number of ranges
int nvalues # The number of values in the ranges
int ip, nrange, first, last, step, ctoi()
begin
ip = 1
nvalues = 0
do nrange = 1, max_ranges - 1 {
# Defaults to all positive integers
first = FIRST
last = LAST
step = STEP
# Skip delimiters
while (IS_WHITE(range_string[ip]) || range_string[ip] == ',')
ip = ip + 1
# Get first limit.
# Must be a number, '-', 'x', or EOS. If not return ERR.
if (range_string[ip] == EOS) { # end of list
if (nrange == 1) {
# Null string defaults
ranges[1, 1] = first
ranges[2, 1] = last
ranges[3, 1] = step
ranges[1, 2] = NULL
nvalues = nvalues + abs (last-first) / step + 1
return (OK)
} else {
ranges[1, nrange] = NULL
return (OK)
}
} else if (range_string[ip] == '-')
;
else if (range_string[ip] == 'x')
;
else if (IS_DIGIT(range_string[ip])) { # ,n..
if (ctoi (range_string, ip, first) == 0)
return (ERR)
} else
return (ERR)
# Skip delimiters
while (IS_WHITE(range_string[ip]) || range_string[ip] == ',')
ip = ip + 1
# Get last limit
# Must be '-', or 'x' otherwise last = first.
if (range_string[ip] == 'x')
;
else if (range_string[ip] == '-') {
ip = ip + 1
while (IS_WHITE(range_string[ip]) || range_string[ip] == ',')
ip = ip + 1
if (range_string[ip] == EOS)
;
else if (IS_DIGIT(range_string[ip])) {
if (ctoi (range_string, ip, last) == 0)
return (ERR)
} else if (range_string[ip] == 'x')
;
else
return (ERR)
} else
last = first
# Skip delimiters
while (IS_WHITE(range_string[ip]) || range_string[ip] == ',')
ip = ip + 1
# Get step.
# Must be 'x' or assume default step.
if (range_string[ip] == 'x') {
ip = ip + 1
while (IS_WHITE(range_string[ip]) || range_string[ip] == ',')
ip = ip + 1
if (range_string[ip] == EOS)
;
else if (IS_DIGIT(range_string[ip])) {
if (ctoi (range_string, ip, step) == 0)
;
} else if (range_string[ip] == '-')
;
else
return (ERR)
}
# Output the range triple.
ranges[1, nrange] = first
ranges[2, nrange] = last
ranges[3, nrange] = step
nvalues = nvalues + abs (last-first) / step + 1
}
return (ERR) # ran out of space
end
# GET_NEXT_NUMBER -- Given a list of ranges and the current file number,
# find and return the next file number. Selection is done in such a way
# that list numbers are always returned in monotonically increasing order,
# regardless of the order in which the ranges are given. Duplicate entries
# are ignored. EOF is returned at the end of the list.
int procedure get_next_number (ranges, number)
int ranges[ARB] # Range array
int number # Both input and output parameter
int ip, first, last, step, next_number, remainder
begin
# If number+1 is anywhere in the list, that is the next number,
# otherwise the next number is the smallest number in the list which
# is greater than number+1.
number = number + 1
next_number = MAX_INT
for (ip=1; ranges[ip] != NULL; ip=ip+3) {
first = min (ranges[ip], ranges[ip+1])
last = max (ranges[ip], ranges[ip+1])
step = ranges[ip+2]
if (number >= first && number <= last) {
remainder = mod (number - first, step)
if (remainder == 0)
return (number)
if (number - remainder + step <= last)
next_number = number - remainder + step
} else if (first > number)
next_number = min (next_number, first)
}
if (next_number == MAX_INT)
return (EOF)
else {
number = next_number
return (number)
}
end
# GET_PREVIOUS_NUMBER -- Given a list of ranges and the current file number,
# find and return the previous file number. Selection is done in such a way
# that list numbers are always returned in monotonically decreasing order,
# regardless of the order in which the ranges are given. Duplicate entries
# are ignored. EOF is returned at the end of the list.
int procedure get_previous_number (ranges, number)
int ranges[ARB] # Range array
int number # Both input and output parameter
int ip, first, last, step, next_number, remainder
begin
# If number-1 is anywhere in the list, that is the previous number,
# otherwise the previous number is the largest number in the list which
# is less than number-1.
number = number - 1
next_number = 0
for (ip=1; ranges[ip] != NULL; ip=ip+3) {
first = min (ranges[ip], ranges[ip+1])
last = max (ranges[ip], ranges[ip+1])
step = ranges[ip+2]
if (number >= first && number <= last) {
remainder = mod (number - first, step)
if (remainder == 0)
return (number)
if (number - remainder >= first)
next_number = number - remainder
} else if (last < number) {
remainder = mod (last - first, step)
if (remainder == 0)
next_number = max (next_number, last)
else if (last - remainder >= first)
next_number = max (next_number, last - remainder)
}
}
if (next_number == 0)
return (EOF)
else {
number = next_number
return (number)
}
end
# IS_IN_RANGE -- Test number to see if it is in range.
bool procedure is_in_range (ranges, number)
int ranges[ARB] # Range array
int number # Number to be tested against ranges
int ip, first, last, step
begin
for (ip=1; ranges[ip] != NULL; ip=ip+3) {
first = min (ranges[ip], ranges[ip+1])
last = max (ranges[ip], ranges[ip+1])
step = ranges[ip+2]
if (number >= first && number <= last)
if (mod (number - first, step) == 0)
return (true)
}
return (false)
end
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