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include <imio.h>
include "hdiff.h"
# PR_HDIFF -- Print differences between two header files
#
# This procedure compares two sorted lists of header keywords. A line is
# printed if a keyword is found in one list and not in the other, or the
# value of the two keywords differs. Since the two lists are sorted, a
# standard merge algorithm can be used to find the differences.
#
# B.Simon 25-Apr-90 Original
procedure pr_hdiff (im1, im2, buffer1, index1, ndx1, buffer2, index2, ndx2)
pointer im1 # i: First image descriptor
pointer im2 # i: Second image descriptor
char buffer1[ARB] # i: First buffer of keyword records
int index1[ARB] # i: First array of keyword record indices
int ndx1 # i: Number of records in first buffer
char buffer2[ARB] # i: Second buffer of keyword records
int index2[ARB] # i: Second array of keyword record indices
int ndx2 # i: Number of records in second buffer
#--
bool title
int idx1, idx2, jdx1, jdx2, order
string nullstring ""
int strncmp(), cmp_record()
begin
title = true
# Since it is the index array that is sorted, and not the string
# buffer, two indices are needed to access the next record
idx1 = 1
idx2 = 1
jdx1 = index1[idx1]
jdx2 = index2[idx2]
# Main phase of merge, when neither list of records is empty
while (idx1 <= ndx1 && idx2 <= ndx2) {
order = strncmp (buffer1[jdx1], buffer2[jdx2], SZ_KEYWORD)
if (order < 0) {
if (title) {
title = false
call pr_title (im1, im2)
}
call pr_record (buffer1[jdx1], nullstring)
idx1 = idx1 + 1
jdx1 = index1[idx1]
} else if (order > 0) {
if (title) {
title = false
call pr_title (im1, im2)
}
call pr_record (nullstring, buffer2[jdx2])
idx2 = idx2 + 1
jdx2 = index2[idx2]
} else {
if (cmp_record (buffer1[jdx1], buffer2[jdx2]) != 0) {
if (title) {
title = false
call pr_title (im1, im2)
}
call pr_record (buffer1[jdx1], buffer2[jdx2])
}
idx1 = idx1 + 1
jdx1 = index1[idx1]
idx2 = idx2 + 1
jdx2 = index2[idx2]
}
}
# Print the tail of the longer list. At most, only one of
# these while loops will be called
while (idx1 <= ndx1) {
if (title) {
title = false
call pr_title (im1, im2)
}
call pr_record (buffer1[jdx1], nullstring)
idx1 = idx1 + 1
jdx1 = index1[idx1]
}
while (idx2 <= ndx2) {
if (title) {
title = false
call pr_title (im1, im2)
}
call pr_record (buffer2[jdx2], nullstring)
idx2 = idx2 + 1
jdx2 = index2[idx1]
}
end
# PR_TITLE -- Print title containing image names
procedure pr_title (im1, im2)
pointer im1 # i: First image descriptor
pointer im2 # i: Second image descriptor
#--
int offset1, offset2
pointer sp, file1, file2, temp, root1, root2
int fnldir()
begin
call smark (sp)
call salloc (file1, SZ_FNAME, TY_CHAR)
call salloc (file2, SZ_FNAME, TY_CHAR)
call salloc (temp, SZ_FNAME, TY_CHAR)
# Remove the directory name from the root, if present
call imgcluster (IM_NAME(im1), Memc[file1], SZ_FNAME)
offset1 = fnldir (Memc[file1], Memc[temp], SZ_FNAME)
call strcpy (IM_NAME(im1), Memc[file1], SZ_FNAME)
root1 = file1 + offset1
call imgcluster (IM_NAME(im2), Memc[file2], SZ_FNAME)
offset2 = fnldir (Memc[file2], Memc[temp], SZ_FNAME)
call strcpy (IM_NAME(im2), Memc[file2], SZ_FNAME)
root2 = file2 + offset2
call printf ("#\n#%11t%-30s%-30s\n#\n")
call pargstr (Memc[root1])
call pargstr (Memc[root2])
call sfree (sp)
end
# PR_RECORD -- Print the two records that differ
procedure pr_record (record1, record2)
char record1[ARB] # i: Keyword record from first image
char record2[ARB] # i: Keyword record from second image
#--
int ic, nc
pointer sp, keyword, value1, value2
int ctowrd()
begin
call smark (sp)
call salloc (keyword, SZ_KEYWORD, TY_CHAR)
call salloc (value1, SZ_VALUE, TY_CHAR)
call salloc (value2, SZ_VALUE, TY_CHAR)
# One or the other of the records may be a null string,
# indicating that this record was not present in the image.
if (record1[1] != EOS) {
call strcpy (record1, Memc[keyword], SZ_KEYWORD)
} else if (record2[1] != EOS) {
call strcpy (record2, Memc[keyword], SZ_KEYWORD)
} else {
call error (1, "pr_record: keyword not found")
}
# Get the value field from the record and trim trailing blanks
if (record1[1] == EOS) {
Memc[value1] = EOS
} else {
ic = START_VALUE
nc = ctowrd (record1, ic, Memc[value1], SZ_VALUE)
for (ic = nc - 1; nc >= 0; ic = ic - 1) {
if (Memc[value1+ic] != ' ')
break
}
Memc[value1+ic+1] = EOS
}
if (record2[1] == EOS) {
Memc[value2] = EOS
} else {
ic = START_VALUE
nc = ctowrd (record2, ic, Memc[value2], SZ_VALUE)
for (ic = nc - 1; nc >= 0; ic = ic - 1) {
if (Memc[value2+ic] != ' ')
break
}
Memc[value2+ic+1] = EOS
}
# Write a line containing the keyword names and the two values,
# either of which may be a null string
call printf ("%-10s%-30s%-30s\n")
call pargstr (Memc[keyword])
call pargstr (Memc[value1])
call pargstr (Memc[value2])
call sfree (sp)
end
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