Commit | Line | Data |
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299f2784 MH |
1 | /* Copyright (c) 1981 Regents of the University of California */ |
2 | static char *sccsid = "@(#)ex_addr.c 7.1 %G%"; | |
f4d38626 MH |
3 | #include "ex.h" |
4 | #include "ex_re.h" | |
5 | ||
6 | /* | |
7 | * Routines for address parsing and assignment and checking of address bounds | |
8 | * in command mode. The routine address is called from ex_cmds.c | |
9 | * to parse each component of a command (terminated by , ; or the beginning | |
10 | * of the command itself. It is also called by the scanning routine | |
11 | * in ex_voperate.c from within open/visual. | |
12 | * | |
13 | * Other routines here manipulate the externals addr1 and addr2. | |
14 | * These are the first and last lines for the current command. | |
15 | * | |
16 | * The variable bigmove remembers whether a non-local glitch of . was | |
17 | * involved in an address expression, so we can set the previous context | |
18 | * mark '' when such a motion occurs. | |
19 | */ | |
20 | ||
21 | static bool bigmove; | |
22 | ||
23 | /* | |
24 | * Set up addr1 and addr2 for commands whose default address is dot. | |
25 | */ | |
26 | setdot() | |
27 | { | |
28 | ||
29 | setdot1(); | |
30 | if (bigmove) | |
31 | markDOT(); | |
32 | } | |
33 | ||
34 | /* | |
35 | * Call setdot1 to set up default addresses without ever | |
36 | * setting the previous context mark. | |
37 | */ | |
38 | setdot1() | |
39 | { | |
40 | ||
41 | if (addr2 == 0) | |
42 | addr1 = addr2 = dot; | |
43 | if (addr1 > addr2) { | |
44 | notempty(); | |
45 | error("Addr1 > addr2|First address exceeds second"); | |
46 | } | |
47 | } | |
48 | ||
49 | /* | |
50 | * Ex allows you to say | |
51 | * delete 5 | |
52 | * to delete 5 lines, etc. | |
53 | * Such nonsense is implemented by setcount. | |
54 | */ | |
55 | setcount() | |
56 | { | |
57 | register int cnt; | |
58 | ||
59 | pastwh(); | |
60 | if (!isdigit(peekchar())) { | |
61 | setdot(); | |
62 | return; | |
63 | } | |
64 | addr1 = addr2; | |
65 | setdot(); | |
66 | cnt = getnum(); | |
67 | if (cnt <= 0) | |
68 | error("Bad count|Nonzero count required"); | |
69 | addr2 += cnt - 1; | |
70 | if (addr2 > dol) | |
71 | addr2 = dol; | |
72 | nonzero(); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Parse a number out of the command input stream. | |
77 | */ | |
78 | getnum() | |
79 | { | |
80 | register int cnt; | |
81 | ||
82 | for (cnt = 0; isdigit(peekcd());) | |
83 | cnt = cnt * 10 + getchar() - '0'; | |
84 | return (cnt); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Set the default addresses for commands which use the whole | |
89 | * buffer as default, notably write. | |
90 | */ | |
91 | setall() | |
92 | { | |
93 | ||
94 | if (addr2 == 0) { | |
95 | addr1 = one; | |
96 | addr2 = dol; | |
97 | if (dol == zero) { | |
98 | dot = zero; | |
99 | return; | |
100 | } | |
101 | } | |
102 | /* | |
103 | * Don't want to set previous context mark so use setdot1(). | |
104 | */ | |
105 | setdot1(); | |
106 | } | |
107 | ||
108 | /* | |
109 | * No address allowed on, e.g. the file command. | |
110 | */ | |
111 | setnoaddr() | |
112 | { | |
113 | ||
114 | if (addr2 != 0) | |
115 | error("No address allowed@on this command"); | |
116 | } | |
117 | ||
118 | /* | |
119 | * Parse an address. | |
120 | * Just about any sequence of address characters is legal. | |
121 | * | |
122 | * If you are tricky you can use this routine and the = command | |
123 | * to do simple addition and subtraction of cardinals less | |
124 | * than the number of lines in the file. | |
125 | */ | |
126 | line * | |
127 | address(inline) | |
128 | char *inline; | |
129 | { | |
130 | register line *addr; | |
131 | register int offset, c; | |
132 | short lastsign; | |
133 | ||
134 | bigmove = 0; | |
135 | lastsign = 0; | |
136 | offset = 0; | |
137 | addr = 0; | |
138 | for (;;) { | |
139 | if (isdigit(peekcd())) { | |
140 | if (addr == 0) { | |
141 | addr = zero; | |
142 | bigmove = 1; | |
143 | } | |
144 | loc1 = 0; | |
145 | addr += offset; | |
146 | offset = getnum(); | |
147 | if (lastsign >= 0) | |
148 | addr += offset; | |
149 | else | |
150 | addr -= offset; | |
151 | lastsign = 0; | |
152 | offset = 0; | |
153 | } | |
154 | switch (c = getcd()) { | |
155 | ||
156 | case '?': | |
157 | case '/': | |
158 | case '$': | |
159 | case '\'': | |
160 | case '\\': | |
161 | bigmove++; | |
162 | case '.': | |
163 | if (addr || offset) | |
164 | error("Badly formed address"); | |
165 | } | |
166 | offset += lastsign; | |
167 | lastsign = 0; | |
168 | switch (c) { | |
169 | ||
170 | case ' ': | |
171 | case '\t': | |
172 | continue; | |
173 | ||
174 | case '+': | |
175 | lastsign = 1; | |
176 | if (addr == 0) | |
177 | addr = dot; | |
178 | continue; | |
179 | ||
180 | case '^': | |
181 | case '-': | |
182 | lastsign = -1; | |
183 | if (addr == 0) | |
184 | addr = dot; | |
185 | continue; | |
186 | ||
187 | case '\\': | |
188 | case '?': | |
189 | case '/': | |
190 | c = compile(c, 1); | |
191 | notempty(); | |
192 | savere(scanre); | |
193 | addr = dot; | |
194 | if (inline && execute(0, dot)) { | |
195 | if (c == '/') { | |
d266c416 MH |
196 | while (loc1 <= inline) { |
197 | if (loc1 == loc2) | |
198 | loc2++; | |
f4d38626 MH |
199 | if (!execute(1)) |
200 | goto nope; | |
ea87719e MH |
201 | } |
202 | break; | |
203 | } else if (loc1 < inline) { | |
204 | char *last; | |
205 | doques: | |
206 | ||
207 | do { | |
208 | last = loc1; | |
209 | if (loc1 == loc2) | |
210 | loc2++; | |
211 | if (!execute(1)) | |
212 | break; | |
213 | } while (loc1 < inline); | |
214 | loc1 = last; | |
215 | break; | |
216 | } | |
217 | } | |
218 | nope: | |
219 | for (;;) { | |
220 | if (c == '/') { | |
221 | addr++; | |
222 | if (addr > dol) { | |
223 | if (value(WRAPSCAN) == 0) | |
224 | error("No match to BOTTOM|Address search hit BOTTOM without matching pattern"); | |
225 | addr = zero; | |
226 | } | |
227 | } else { | |
228 | addr--; | |
229 | if (addr < zero) { | |
230 | if (value(WRAPSCAN) == 0) | |
231 | error("No match to TOP|Address search hit TOP without matching pattern"); | |
232 | addr = dol; | |
233 | } | |
234 | } | |
235 | if (execute(0, addr)) { | |
236 | if (inline && c == '?') { | |
237 | inline = &linebuf[LBSIZE]; | |
238 | goto doques; | |
239 | } | |
240 | break; | |
241 | } | |
242 | if (addr == dot) | |
243 | error("Fail|Pattern not found"); | |
244 | } | |
245 | continue; | |
246 | ||
247 | case '$': | |
248 | addr = dol; | |
249 | continue; | |
250 | ||
251 | case '.': | |
252 | addr = dot; | |
253 | continue; | |
254 | ||
255 | case '\'': | |
256 | c = markreg(getchar()); | |
257 | if (c == 0) | |
258 | error("Marks are ' and a-z"); | |
259 | addr = getmark(c); | |
260 | if (addr == 0) | |
261 | error("Undefined mark@referenced"); | |
262 | break; | |
263 | ||
264 | default: | |
265 | ungetchar(c); | |
266 | if (offset) { | |
267 | if (addr == 0) | |
268 | addr = dot; | |
269 | addr += offset; | |
270 | loc1 = 0; | |
271 | } | |
272 | if (addr == 0) { | |
273 | bigmove = 0; | |
274 | return (0); | |
275 | } | |
276 | if (addr != zero) | |
277 | notempty(); | |
278 | addr += lastsign; | |
279 | if (addr < zero) | |
280 | error("Negative address@- first buffer line is 1"); | |
281 | if (addr > dol) | |
282 | error("Not that many lines@in buffer"); | |
283 | return (addr); | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
288 | /* | |
289 | * Abbreviations to make code smaller | |
290 | * Left over from squashing ex version 1.1 into | |
291 | * 11/34's and 11/40's. | |
292 | */ | |
293 | setCNL() | |
294 | { | |
295 | ||
296 | setcount(); | |
297 | newline(); | |
298 | } | |
299 | ||
300 | setNAEOL() | |
301 | { | |
302 | ||
303 | setnoaddr(); | |
304 | eol(); | |
305 | } |