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# CCDSUBSET -- Return the CCD subset identifier.
#
# 1. Get the subset string and search the subset record file for the ID string.
# 2. If the subset string is not in the record file define a default ID string
# based on the first word of the subset string. If the first word is not
# unique append a integer to the first word until it is unique.
# 3. Add the new subset string and identifier to the record file.
# 4. Since the ID string is used to generate image names replace all
# nonimage name characters with '_'.
#
# It is an error if the record file cannot be created or written when needed.
procedure ccdsubset (im, subset, sz_name)
pointer im # Image
char subset[sz_name] # CCD subset identifier
int sz_name # Size of subset string
bool streq()
int i, fd, ctowrd(), open(), fscan()
pointer sp, fname, str1, str2, subset1, subset2, subset3
errchk open
begin
call smark (sp)
call salloc (fname, SZ_FNAME, TY_CHAR)
call salloc (str1, SZ_LINE, TY_CHAR)
call salloc (str2, SZ_LINE, TY_CHAR)
call salloc (subset1, SZ_LINE, TY_CHAR)
call salloc (subset2, SZ_LINE, TY_CHAR)
call salloc (subset3, SZ_LINE, TY_CHAR)
# Get the subset record file and the subset string.
call clgstr ("ssfile", Memc[fname], SZ_LINE)
call hdmgstr (im, "subset", Memc[str1], SZ_LINE)
# The default subset identifier is the first word of the subset string.
i = 1
i = ctowrd (Memc[str1], i, Memc[subset1], SZ_LINE)
# A null subset string is ok. If not null check for conflict
# with previous subset IDs.
if (Memc[str1] != EOS) {
call strcpy (Memc[subset1], Memc[subset3], SZ_LINE)
# Search the subset record file for the same subset string.
# If found use the ID string. If the subset ID has been
# used for another subset string then increment an integer
# suffix to the default ID and check the list again.
i = 1
ifnoerr (fd = open (Memc[fname], READ_ONLY, TEXT_FILE)) {
while (fscan (fd) != EOF) {
call gargwrd (Memc[str2], SZ_LINE)
call gargwrd (Memc[subset2], SZ_LINE)
if (streq (Memc[str1], Memc[str2])) {
i = 0
call strcpy (Memc[subset2], Memc[subset1], SZ_LINE)
break
} if (streq (Memc[subset1], Memc[subset2])) {
call sprintf (Memc[subset1], SZ_LINE, "%s%d")
call pargstr (Memc[subset3])
call pargi (i)
i = i + 1
call seek (fd, BOF)
}
}
call close (fd)
}
# If the subset is not in the record file add it.
if (i > 0) {
fd = open (Memc[fname], APPEND, TEXT_FILE)
call fprintf (fd, "'%s'\t%s\n")
call pargstr (Memc[str1])
call pargstr (Memc[subset1])
call close (fd)
}
}
# Set the subset ID string and replace magic characters by '_'
# since the subset ID is used in forming image names.
call strcpy (Memc[subset1], subset, sz_name)
for (i=1; subset[i]!=EOS; i=i+1)
switch (subset[i]) {
case '-','+','?','*','[',']',' ','\t':
subset[i] = '_'
}
call sfree (sp)
end
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