1 /* sdiff-format output routines for GNU DIFF.
2 Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GNU DIFF.
6 GNU DIFF is distributed in the hope that it will be useful,
7 but WITHOUT ANY WARRANTY. No author or distributor
8 accepts responsibility to anyone for the consequences of using it
9 or for whether it serves any particular purpose or works at all,
10 unless he says so in writing. Refer to the GNU DIFF General Public
11 License for full details.
13 Everyone is granted permission to copy, modify and redistribute
14 GNU DIFF, but only under the conditions described in the
15 GNU DIFF General Public License. A copy of this license is
16 supposed to have been given to you along with GNU DIFF so you
17 can know your rights and responsibilities. It should be in a
18 file named COPYING. Among other things, the copyright notice
19 and this notice must be preserved on all copies. */
24 static unsigned print_half_line PARAMS((char const * const *, unsigned, unsigned));
25 static unsigned tab_from_to PARAMS((unsigned, unsigned));
26 static void print_1sdiff_line PARAMS((char const * const *, int, char const * const *));
27 static void print_sdiff_common_lines PARAMS((int, int));
28 static void print_sdiff_hunk PARAMS((struct change *));
30 /* Next line number to be printed in the two input files. */
31 static int next0, next1;
33 /* Print the edit-script SCRIPT as a sdiff style output. */
36 print_sdiff_script (script)
37 struct change *script;
41 next0 = next1 = - files[0].prefix_lines;
42 print_script (script, find_change, print_sdiff_hunk);
44 print_sdiff_common_lines (files[0].valid_lines, files[1].valid_lines);
47 /* Tab from column FROM to column TO, where FROM <= TO. Yield TO. */
50 tab_from_to (from, to)
56 if (! tab_expand_flag)
57 for (tab = from + TAB_WIDTH - from % TAB_WIDTH; tab <= to; tab += TAB_WIDTH)
68 * Print the text for half an sdiff line. This means truncate to width
69 * observing tabs, and trim a trailing newline. Returns the last column
70 * written (not the number of chars).
73 print_half_line (line, indent, out_bound)
74 char const * const *line;
75 unsigned indent, out_bound;
78 register unsigned in_position = 0, out_position = 0;
80 *text_pointer = line[0],
81 *text_limit = line[1];
83 while (text_pointer < text_limit)
85 register unsigned char c = *text_pointer++;
91 unsigned spaces = TAB_WIDTH - in_position % TAB_WIDTH;
92 if (in_position == out_position)
94 unsigned tabstop = out_position + spaces;
97 if (out_bound < tabstop)
99 for (; out_position < tabstop; out_position++)
103 if (tabstop < out_bound)
105 out_position = tabstop;
109 in_position += spaces;
116 tab_from_to (0, indent);
117 in_position = out_position = 0;
122 if (in_position != 0 && --in_position < out_bound)
123 if (out_position <= in_position)
124 /* Add spaces to make up for suppressed tab past out_bound. */
125 for (; out_position < in_position; out_position++)
129 out_position = in_position;
137 if (in_position < out_bound)
146 if (in_position++ < out_bound)
148 out_position = in_position;
162 * Print side by side lines with a separator in the middle.
163 * 0 parameters are taken to indicate white space text.
164 * Blank lines that can easily be caught are reduced to a single newline.
168 print_1sdiff_line (left, sep, right)
169 char const * const *left;
171 char const * const *right;
174 unsigned hw = sdiff_half_width, c2o = sdiff_column2_offset;
180 if (left[1][-1] == '\n')
182 col = print_half_line (left, 0, hw);
187 col = tab_from_to (col, (hw + c2o - 1) / 2) + 1;
188 if (sep == '|' && put_newline != (right[1][-1] == '\n'))
189 sep = put_newline ? '/' : '\\';
195 if (right[1][-1] == '\n')
199 col = tab_from_to (col, c2o);
200 print_half_line (right, col, hw);
208 /* Print lines common to both files in side-by-side format. */
210 print_sdiff_common_lines (limit0, limit1)
213 int i0 = next0, i1 = next1;
215 if (! sdiff_skip_common_lines && (i0 != limit0 || i1 != limit1))
217 if (sdiff_help_sdiff)
218 fprintf (outfile, "i%d,%d\n", limit0 - i0, limit1 - i1);
220 if (! sdiff_left_only)
222 while (i0 != limit0 && i1 != limit1)
223 print_1sdiff_line (&files[0].linbuf[i0++], ' ', &files[1].linbuf[i1++]);
225 print_1sdiff_line (0, ')', &files[1].linbuf[i1++]);
228 print_1sdiff_line (&files[0].linbuf[i0++], '(', 0);
235 /* Print a hunk of an sdiff diff.
236 This is a contiguous portion of a complete edit script,
237 describing changes in consecutive lines. */
240 print_sdiff_hunk (hunk)
243 int first0, last0, first1, last1, deletes, inserts;
246 /* Determine range of line numbers involved in each file. */
247 analyze_hunk (hunk, &first0, &last0, &first1, &last1, &deletes, &inserts);
248 if (!deletes && !inserts)
251 /* Print out lines up to this change. */
252 print_sdiff_common_lines (first0, first1);
254 if (sdiff_help_sdiff)
255 fprintf (outfile, "c%d,%d\n", last0 - first0 + 1, last1 - first1 + 1);
257 /* Print ``xxx | xxx '' lines */
258 if (inserts && deletes)
260 for (i = first0, j = first1; i <= last0 && j <= last1; ++i, ++j)
261 print_1sdiff_line (&files[0].linbuf[i], '|', &files[1].linbuf[j]);
262 deletes = i <= last0;
263 inserts = j <= last1;
269 /* Print `` > xxx '' lines */
272 for (j = first1; j <= last1; ++j)
273 print_1sdiff_line (0, '>', &files[1].linbuf[j]);
277 /* Print ``xxx < '' lines */
280 for (i = first0; i <= last0; ++i)
281 print_1sdiff_line (&files[0].linbuf[i], '<', 0);