1 /*        $NetBSD: glbl.c,v 1.11 2024/04/10 17:52:41 rillig Exp $     */
2 
3 /* glbl.c: This file contains the global command routines for the ed line
4    editor */
5 /*-
6  * Copyright (c) 1993 Andrew Moore, Talke Studio.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 #include <sys/cdefs.h>
32 #ifndef lint
33 #if 0
34 static char *rcsid = "@(#)glob.c,v 1.1 1994/02/01 00:34:40 alm Exp";
35 #else
36 __RCSID("$NetBSD: glbl.c,v 1.11 2024/04/10 17:52:41 rillig Exp $");
37 #endif
38 #endif /* not lint */
39 
40 #include <sys/ioctl.h>
41 #include <sys/wait.h>
42 
43 #include "ed.h"
44 
45 
46 /* build_active_list:  add line matching a pattern to the global-active list */
47 int
build_active_list(int isgcmd)48 build_active_list(int isgcmd)
49 {
50           pattern_t *pat;
51           line_t *lp;
52           long n;
53           char *s;
54           char delimiter;
55 
56           if ((delimiter = *ibufp) == ' ' || delimiter == '\n') {
57                     seterrmsg("invalid pattern delimiter");
58                     return ERR;
59           } else if ((pat = get_compiled_pattern()) == NULL)
60                     return ERR;
61           else if (*ibufp == delimiter)
62                     ibufp++;
63           clear_active_list();
64           lp = get_addressed_line_node(first_addr);
65           for (n = first_addr; n <= second_addr; n++, lp = lp->q_forw) {
66                     if ((s = get_sbuf_line(lp)) == NULL)
67                               return ERR;
68                     if (isbinary)
69                               NUL_TO_NEWLINE(s, lp->len);
70                     if ((!regexec(pat, s, 0, NULL, 0)) == isgcmd &&
71                         set_active_node(lp) < 0)
72                               return ERR;
73           }
74           return 0;
75 }
76 
77 
78 /* exec_global: apply command list in the command buffer to the active
79    lines in a range; return command status */
80 long
exec_global(int interact,int gflag)81 exec_global(int interact, int gflag)
82 {
83           static char *ocmd = NULL;
84           static int ocmdsz = 0;
85 
86           line_t *lp = NULL;
87           int status;
88           int n;
89           char *cmd = NULL;
90 #ifdef BACKWARDS
91           char cmdp[] = "p\n";
92 
93           if (!interact) {
94                     if (!strcmp(ibufp, "\n"))
95                               cmd = cmdp;                   /* null cmd-list == `p' */
96                     else if ((cmd = get_extended_line(&n, 0)) == NULL)
97                               return ERR;
98           }
99 #else
100           if (!interact && (cmd = get_extended_line(&n, 0)) == NULL)
101                     return ERR;
102 #endif
103           clear_undo_stack();
104           while ((lp = next_active_node()) != NULL) {
105                     if ((current_addr = get_line_node_addr(lp)) < 0)
106                               return ERR;
107                     if (interact) {
108                               /* print current_addr; get a command in global syntax */
109                               if (display_lines(current_addr, current_addr, gflag) < 0)
110                                         return ERR;
111                               while ((n = get_tty_line()) > 0 &&
112                                   ibuf[n - 1] != '\n')
113                                         clearerr(stdin);
114                               if (n < 0)
115                                         return ERR;
116                               else if (n == 0) {
117                                         seterrmsg("unexpected end-of-file");
118                                         return ERR;
119                               } else if (n == 1 && !strcmp(ibuf, "\n"))
120                                         continue;
121                               else if (n == 2 && !strcmp(ibuf, "&\n")) {
122                                         if (cmd == NULL) {
123                                                   seterrmsg("no previous command");
124                                                   return ERR;
125                                         } else cmd = ocmd;
126                               } else if ((cmd = get_extended_line(&n, 0)) == NULL)
127                                         return ERR;
128                               else {
129                                         REALLOC(ocmd, ocmdsz, n + 1, ERR);
130                                         memcpy(ocmd, cmd, n + 1);
131                                         cmd = ocmd;
132                               }
133 
134                     }
135                     ibufp = cmd;
136                     for (; *ibufp;)
137                               if ((status = extract_addr_range()) < 0 ||
138                                   (status = exec_command()) < 0 ||
139                                   (status > 0 && (status = display_lines(
140                                   current_addr, current_addr, status)) < 0))
141                                         return status;
142           }
143           return 0;
144 }
145 
146 
147 line_t **active_list;                   /* list of lines active in a global command */
148 long active_last;             /* index of last active line in active_list */
149 long active_size;             /* size of active_list */
150 long active_ptr;              /* active_list index (non-decreasing) */
151 long active_ndx;              /* active_list index (modulo active_last) */
152 
153 /* set_active_node: add a line node to the global-active list */
154 int
set_active_node(line_t * lp)155 set_active_node(line_t *lp)
156 {
157           if (active_last + 1 > active_size) {
158                     int ti = active_size;
159                     line_t **ts;
160                     SPL1();
161                     if ((ts = (line_t **) realloc(active_list,
162                         (ti += MINBUFSZ) * sizeof(line_t **))) == NULL) {
163                               fprintf(stderr, "%s\n", strerror(errno));
164                               seterrmsg("out of memory");
165                               SPL0();
166                               return ERR;
167                     }
168                     active_size = ti;
169                     active_list = ts;
170                     SPL0();
171           }
172           active_list[active_last++] = lp;
173           return 0;
174 }
175 
176 
177 /* unset_active_nodes: remove a range of lines from the global-active list */
178 void
unset_active_nodes(line_t * np,line_t * mp)179 unset_active_nodes(line_t *np, line_t *mp)
180 {
181           line_t *lp;
182           long i;
183 
184           for (lp = np; lp != mp; lp = lp->q_forw)
185                     for (i = 0; i < active_last; i++)
186                               if (active_list[active_ndx] == lp) {
187                                         active_list[active_ndx] = NULL;
188                                         active_ndx = INC_MOD(active_ndx, active_last - 1);
189                                         break;
190                               } else    active_ndx = INC_MOD(active_ndx, active_last - 1);
191 }
192 
193 
194 /* next_active_node: return the next global-active line node */
195 line_t *
next_active_node(void)196 next_active_node(void)
197 {
198           while (active_ptr < active_last && active_list[active_ptr] == NULL)
199                     active_ptr++;
200           return (active_ptr < active_last) ? active_list[active_ptr++] : NULL;
201 }
202 
203 
204 /* clear_active_list: clear the global-active list */
205 void
clear_active_list(void)206 clear_active_list(void)
207 {
208           SPL1();
209           active_size = active_last = active_ptr = active_ndx = 0;
210           free(active_list);
211           active_list = NULL;
212           SPL0();
213 }
214