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-rw-r--r--contrib/diff/side.c284
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diff --git a/contrib/diff/side.c b/contrib/diff/side.c
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+++ b/contrib/diff/side.c
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+/* sdiff-format output routines for GNU DIFF.
+ Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
+
+This file is part of GNU DIFF.
+
+GNU DIFF is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY. No author or distributor
+accepts responsibility to anyone for the consequences of using it
+or for whether it serves any particular purpose or works at all,
+unless he says so in writing. Refer to the GNU DIFF General Public
+License for full details.
+
+Everyone is granted permission to copy, modify and redistribute
+GNU DIFF, but only under the conditions described in the
+GNU DIFF General Public License. A copy of this license is
+supposed to have been given to you along with GNU DIFF so you
+can know your rights and responsibilities. It should be in a
+file named COPYING. Among other things, the copyright notice
+and this notice must be preserved on all copies. */
+
+
+#include "diff.h"
+
+static unsigned print_half_line PARAMS((char const * const *, unsigned, unsigned));
+static unsigned tab_from_to PARAMS((unsigned, unsigned));
+static void print_1sdiff_line PARAMS((char const * const *, int, char const * const *));
+static void print_sdiff_common_lines PARAMS((int, int));
+static void print_sdiff_hunk PARAMS((struct change *));
+
+/* Next line number to be printed in the two input files. */
+static int next0, next1;
+
+/* Print the edit-script SCRIPT as a sdiff style output. */
+
+void
+print_sdiff_script (script)
+ struct change *script;
+{
+ begin_output ();
+
+ next0 = next1 = - files[0].prefix_lines;
+ print_script (script, find_change, print_sdiff_hunk);
+
+ print_sdiff_common_lines (files[0].valid_lines, files[1].valid_lines);
+}
+
+/* Tab from column FROM to column TO, where FROM <= TO. Yield TO. */
+
+static unsigned
+tab_from_to (from, to)
+ unsigned from, to;
+{
+ FILE *out = outfile;
+ unsigned tab;
+
+ if (! tab_expand_flag)
+ for (tab = from + TAB_WIDTH - from % TAB_WIDTH; tab <= to; tab += TAB_WIDTH)
+ {
+ putc ('\t', out);
+ from = tab;
+ }
+ while (from++ < to)
+ putc (' ', out);
+ return to;
+}
+
+/*
+ * Print the text for half an sdiff line. This means truncate to width
+ * observing tabs, and trim a trailing newline. Returns the last column
+ * written (not the number of chars).
+ */
+static unsigned
+print_half_line (line, indent, out_bound)
+ char const * const *line;
+ unsigned indent, out_bound;
+{
+ FILE *out = outfile;
+ register unsigned in_position = 0, out_position = 0;
+ register char const
+ *text_pointer = line[0],
+ *text_limit = line[1];
+
+ while (text_pointer < text_limit)
+ {
+ register unsigned char c = *text_pointer++;
+
+ switch (c)
+ {
+ case '\t':
+ {
+ unsigned spaces = TAB_WIDTH - in_position % TAB_WIDTH;
+ if (in_position == out_position)
+ {
+ unsigned tabstop = out_position + spaces;
+ if (tab_expand_flag)
+ {
+ if (out_bound < tabstop)
+ tabstop = out_bound;
+ for (; out_position < tabstop; out_position++)
+ putc (' ', out);
+ }
+ else
+ if (tabstop < out_bound)
+ {
+ out_position = tabstop;
+ putc (c, out);
+ }
+ }
+ in_position += spaces;
+ }
+ break;
+
+ case '\r':
+ {
+ putc (c, out);
+ tab_from_to (0, indent);
+ in_position = out_position = 0;
+ }
+ break;
+
+ case '\b':
+ if (in_position != 0 && --in_position < out_bound)
+ if (out_position <= in_position)
+ /* Add spaces to make up for suppressed tab past out_bound. */
+ for (; out_position < in_position; out_position++)
+ putc (' ', out);
+ else
+ {
+ out_position = in_position;
+ putc (c, out);
+ }
+ break;
+
+ case '\f':
+ case '\v':
+ control_char:
+ if (in_position < out_bound)
+ putc (c, out);
+ break;
+
+ default:
+ if (! ISPRINT (c))
+ goto control_char;
+ /* falls through */
+ case ' ':
+ if (in_position++ < out_bound)
+ {
+ out_position = in_position;
+ putc (c, out);
+ }
+ break;
+
+ case '\n':
+ return out_position;
+ }
+ }
+
+ return out_position;
+}
+
+/*
+ * Print side by side lines with a separator in the middle.
+ * 0 parameters are taken to indicate white space text.
+ * Blank lines that can easily be caught are reduced to a single newline.
+ */
+
+static void
+print_1sdiff_line (left, sep, right)
+ char const * const *left;
+ int sep;
+ char const * const *right;
+{
+ FILE *out = outfile;
+ unsigned hw = sdiff_half_width, c2o = sdiff_column2_offset;
+ unsigned col = 0;
+ int put_newline = 0;
+
+ if (left)
+ {
+ if (left[1][-1] == '\n')
+ put_newline = 1;
+ col = print_half_line (left, 0, hw);
+ }
+
+ if (sep != ' ')
+ {
+ col = tab_from_to (col, (hw + c2o - 1) / 2) + 1;
+ if (sep == '|' && put_newline != (right[1][-1] == '\n'))
+ sep = put_newline ? '/' : '\\';
+ putc (sep, out);
+ }
+
+ if (right)
+ {
+ if (right[1][-1] == '\n')
+ put_newline = 1;
+ if (**right != '\n')
+ {
+ col = tab_from_to (col, c2o);
+ print_half_line (right, col, hw);
+ }
+ }
+
+ if (put_newline)
+ putc ('\n', out);
+}
+
+/* Print lines common to both files in side-by-side format. */
+static void
+print_sdiff_common_lines (limit0, limit1)
+ int limit0, limit1;
+{
+ int i0 = next0, i1 = next1;
+
+ if (! sdiff_skip_common_lines && (i0 != limit0 || i1 != limit1))
+ {
+ if (sdiff_help_sdiff)
+ fprintf (outfile, "i%d,%d\n", limit0 - i0, limit1 - i1);
+
+ if (! sdiff_left_only)
+ {
+ while (i0 != limit0 && i1 != limit1)
+ print_1sdiff_line (&files[0].linbuf[i0++], ' ', &files[1].linbuf[i1++]);
+ while (i1 != limit1)
+ print_1sdiff_line (0, ')', &files[1].linbuf[i1++]);
+ }
+ while (i0 != limit0)
+ print_1sdiff_line (&files[0].linbuf[i0++], '(', 0);
+ }
+
+ next0 = limit0;
+ next1 = limit1;
+}
+
+/* Print a hunk of an sdiff diff.
+ This is a contiguous portion of a complete edit script,
+ describing changes in consecutive lines. */
+
+static void
+print_sdiff_hunk (hunk)
+ struct change *hunk;
+{
+ int first0, last0, first1, last1, deletes, inserts;
+ register int i, j;
+
+ /* Determine range of line numbers involved in each file. */
+ analyze_hunk (hunk, &first0, &last0, &first1, &last1, &deletes, &inserts);
+ if (!deletes && !inserts)
+ return;
+
+ /* Print out lines up to this change. */
+ print_sdiff_common_lines (first0, first1);
+
+ if (sdiff_help_sdiff)
+ fprintf (outfile, "c%d,%d\n", last0 - first0 + 1, last1 - first1 + 1);
+
+ /* Print ``xxx | xxx '' lines */
+ if (inserts && deletes)
+ {
+ for (i = first0, j = first1; i <= last0 && j <= last1; ++i, ++j)
+ print_1sdiff_line (&files[0].linbuf[i], '|', &files[1].linbuf[j]);
+ deletes = i <= last0;
+ inserts = j <= last1;
+ next0 = first0 = i;
+ next1 = first1 = j;
+ }
+
+
+ /* Print `` > xxx '' lines */
+ if (inserts)
+ {
+ for (j = first1; j <= last1; ++j)
+ print_1sdiff_line (0, '>', &files[1].linbuf[j]);
+ next1 = j;
+ }
+
+ /* Print ``xxx < '' lines */
+ if (deletes)
+ {
+ for (i = first0; i <= last0; ++i)
+ print_1sdiff_line (&files[0].linbuf[i], '<', 0);
+ next0 = i;
+ }
+}
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