Mercurial > ~dholland > hg > ag > index.cgi

annotate examples/dsl/edit.h @ 7:57b2cc9b87f7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use memcpy instead of strncpy when we know the length anyway. Modern gcc seems to think it knows how to detect misuse of strncpy, but it's wrong (in fact: very, very wrong) and the path of least resistance is to not try to fight with it.
author David A. Holland
date Mon, 30 May 2022 23:47:52 -0400
parents 13d2b8934445
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
1 /*****
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
2
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
3 AnaGram Programming Examples
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
4
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
5 A Dos Script Language
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
6 Line Edit Class
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
7 The Edit Class is completely defined in this file.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
8 There is no supporting CPP file.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
9
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
10 Copyright 1993 Parsifal Software. All Rights Reserved.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
11
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
12 This software is provided 'as-is', without any express or implied
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
13 warranty. In no event will the authors be held liable for any damages
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
14 arising from the use of this software.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
15
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
16 Permission is granted to anyone to use this software for any purpose,
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
17 including commercial applications, and to alter it and redistribute it
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
18 freely, subject to the following restrictions:
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
19
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
20 1. The origin of this software must not be misrepresented; you must not
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
21 claim that you wrote the original software. If you use this software
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
22 in a product, an acknowledgment in the product documentation would be
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
23 appreciated but is not required.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
24 2. Altered source versions must be plainly marked as such, and must not be
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
25 misrepresented as being the original software.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
26 3. This notice may not be removed or altered from any source distribution.
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
27
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
28 *****/
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
29
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
30
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
31 #ifndef EDIT_H
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
32 #define EDIT_H
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
33
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
34 #include <string.h>
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
35 #include "charsink.h"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
36 #include "util.h"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
37 #include "screen.h"
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
38
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
39 class line_edit_buffer {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
40 char *text; // text of line being edited
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
41 int x; // position of cursor in line
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
42 int length; // length of line
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
43 int buf_size; // does not include final zero
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
44 public:
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
45 int changes; // if non-zero, line changed
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
46
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
47
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
48 // Constructors
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
49
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
50 line_edit_buffer(int n) { // Init with no initial string
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
51 buf_size = n;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
52 text = new char[buf_size + 1];
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
53 memset(text,0, buf_size + 1);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
54 x = length = changes = 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
55 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
56
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
57 line_edit_buffer(char *s, int n) { // Init with initial string
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
58 if (s != NULL) {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
59 length = strlen(s);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
60 if (length > n) n = length; // Make buf at least as long
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
61 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
62 else length = 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
63 buf_size = n;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
64 text = new char[buf_size + 1];
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
65 memset(text,0, buf_size + 1);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
66 if (s != NULL) strcpy(text, s);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
67 x = changes = 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
68 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
69
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
70
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
71 // Destructor
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
72
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
73 ~line_edit_buffer() {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
74 delete [] text;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
75 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
76
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
77
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
78 // Insert char in buffer
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
79
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
80 line_edit_buffer &operator << (const int c) {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
81 if (length >= buf_size) return *this;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
82 if (length < x) {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
83 memset(&text[length], ' ', x - length);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
84 length = x;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
85 text[length] = 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
86 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
87 memmove(&text[x+1], &text[x], length++ - x);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
88 text[x++] = (char )c;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
89 changes++;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
90 return *this;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
91 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
92
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
93
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
94 // Increment cursor position
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
95
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
96 line_edit_buffer &operator ++() {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
97 if (x < buf_size) x++;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
98 return *this;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
99 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
100
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
101
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
102 // Move to end of line
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
103
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
104 friend line_edit_buffer &end(line_edit_buffer &b) {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
105 b.x = b.length;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
106 return b;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
107 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
108 line_edit_buffer &operator --() {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
109 if (x) x--;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
110 return *this;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
111 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
112
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
113 // Move to beginning of line
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
114
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
115 friend line_edit_buffer &home(line_edit_buffer &b) {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
116 b.x = 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
117 return b;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
118 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
119
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
120 // Delete a character
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
121
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
122 line_edit_buffer &operator ~() {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
123 if (x >= length) return *this;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
124 memmove(&text[x], &text[x+1], --length - x);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
125 text[length] = 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
126 changes++;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
127 return *this;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
128 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
129
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
130 operator char *() {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
131 return text;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
132 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
133
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
134 int index() { // return index in line
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
135 return x;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
136 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
137
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
138
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
139 // Display edit buffer in a a screen rectangle
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
140
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
141 friend screen_rect &operator << ( screen_rect &r
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
142 , const line_edit_buffer &b
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
143 ) {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
144 int offset = b.x - r.size.x + 1;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
145 if (offset < 0) offset = 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
146
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
147 r.set_cursor(b.x - offset) << (b.text + offset);
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
148 return r;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
149 }
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
150 };
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
151
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff changeset
152 #endif