1 /* $NetBSD: ed.c,v 1.1.1.1 2016/01/13 03:15:30 christos Exp $ */
2
3 /* Output routines for ed-script format.
4
5 Copyright (C) 1988, 1989, 1991, 1992, 1993, 1995, 1998, 2001 Free
6 Software Foundation, Inc.
7
8 This file is part of GNU DIFF.
9
10 GNU DIFF is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
13 any later version.
14
15 GNU DIFF is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; see the file COPYING.
22 If not, write to the Free Software Foundation,
23 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24
25 #include "diff.h"
26
27 static void print_ed_hunk (struct change *);
28 static void print_rcs_hunk (struct change *);
29 static void pr_forward_ed_hunk (struct change *);
30
31 /* Print our script as ed commands. */
32
33 void
print_ed_script(struct change * script)34 print_ed_script (struct change *script)
35 {
36 print_script (script, find_reverse_change, print_ed_hunk);
37 }
38
39 /* Print a hunk of an ed diff */
40
41 static void
print_ed_hunk(struct change * hunk)42 print_ed_hunk (struct change *hunk)
43 {
44 lin f0, l0, f1, l1;
45 enum changes changes;
46
47 #ifdef DEBUG
48 debug_script (hunk);
49 #endif
50
51 /* Determine range of line numbers involved in each file. */
52 changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1);
53 if (!changes)
54 return;
55
56 begin_output ();
57
58 /* Print out the line number header for this hunk */
59 print_number_range (',', &files[0], f0, l0);
60 fprintf (outfile, "%c\n", change_letter[changes]);
61
62 /* Print new/changed lines from second file, if needed */
63 if (changes != OLD)
64 {
65 lin i;
66 for (i = f1; i <= l1; i++)
67 {
68 if (files[1].linbuf[i][0] == '.' && files[1].linbuf[i][1] == '\n')
69 {
70 /* The file's line is just a dot, and it would exit
71 insert mode. Precede the dot with another dot, exit
72 insert mode, remove the extra dot, and then resume
73 insert mode. */
74 fprintf (outfile, "..\n.\ns/.//\na\n");
75 }
76 else
77 print_1_line ("", &files[1].linbuf[i]);
78 }
79
80 fprintf (outfile, ".\n");
81 }
82 }
83
84 /* Print change script in the style of ed commands,
85 but print the changes in the order they appear in the input files,
86 which means that the commands are not truly useful with ed. */
87
88 void
pr_forward_ed_script(struct change * script)89 pr_forward_ed_script (struct change *script)
90 {
91 print_script (script, find_change, pr_forward_ed_hunk);
92 }
93
94 static void
pr_forward_ed_hunk(struct change * hunk)95 pr_forward_ed_hunk (struct change *hunk)
96 {
97 lin i, f0, l0, f1, l1;
98
99 /* Determine range of line numbers involved in each file. */
100 enum changes changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1);
101 if (!changes)
102 return;
103
104 begin_output ();
105
106 fprintf (outfile, "%c", change_letter[changes]);
107 print_number_range (' ', files, f0, l0);
108 fprintf (outfile, "\n");
109
110 /* If deletion only, print just the number range. */
111
112 if (changes == OLD)
113 return;
114
115 /* For insertion (with or without deletion), print the number range
116 and the lines from file 2. */
117
118 for (i = f1; i <= l1; i++)
119 print_1_line ("", &files[1].linbuf[i]);
120
121 fprintf (outfile, ".\n");
122 }
123
124 /* Print in a format somewhat like ed commands
125 except that each insert command states the number of lines it inserts.
126 This format is used for RCS. */
127
128 void
print_rcs_script(struct change * script)129 print_rcs_script (struct change *script)
130 {
131 print_script (script, find_change, print_rcs_hunk);
132 }
133
134 /* Print a hunk of an RCS diff */
135
136 static void
print_rcs_hunk(struct change * hunk)137 print_rcs_hunk (struct change *hunk)
138 {
139 lin i, f0, l0, f1, l1;
140 long tf0, tl0, tf1, tl1;
141
142 /* Determine range of line numbers involved in each file. */
143 enum changes changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1);
144 if (!changes)
145 return;
146
147 begin_output ();
148
149 translate_range (&files[0], f0, l0, &tf0, &tl0);
150
151 if (changes & OLD)
152 {
153 fprintf (outfile, "d");
154 /* For deletion, print just the starting line number from file 0
155 and the number of lines deleted. */
156 fprintf (outfile, "%ld %ld\n", tf0, tf0 <= tl0 ? tl0 - tf0 + 1 : 1);
157 }
158
159 if (changes & NEW)
160 {
161 fprintf (outfile, "a");
162
163 /* Take last-line-number from file 0 and # lines from file 1. */
164 translate_range (&files[1], f1, l1, &tf1, &tl1);
165 fprintf (outfile, "%ld %ld\n", tl0, tf1 <= tl1 ? tl1 - tf1 + 1 : 1);
166
167 /* Print the inserted lines. */
168 for (i = f1; i <= l1; i++)
169 print_1_line ("", &files[1].linbuf[i]);
170 }
171 }
172