1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 /*
28 * Simple commandline interpreter, toplevel and misc.
29 */
30
31 #include <stand.h>
32 #include <string.h>
33 #include "bootstrap.h"
34
35 INTERP_DEFINE("simp");
36
37 void
interp_preinit(void)38 interp_preinit(void)
39 {
40 }
41
42 void
interp_init(void)43 interp_init(void)
44 {
45
46 setenv("script.lang", "simple", 1);
47 /* Read our default configuration. */
48 interp_include("/boot/loader.rc");
49 }
50
51 int
interp_run(const char * input)52 interp_run(const char *input)
53 {
54 int argc;
55 char **argv;
56
57 if (parse(&argc, &argv, input)) {
58 printf("parse error\n");
59 return CMD_ERROR;
60 }
61
62 if (interp_builtin_cmd(argc, argv)) {
63 printf("%s: %s\n", argv[0], command_errmsg);
64 free(argv);
65 return CMD_ERROR;
66 }
67 free(argv);
68 return CMD_OK;
69 }
70
71 /*
72 * Header prepended to each line. The text immediately follows the header.
73 * We try to make this short in order to save memory -- the loader has
74 * limited memory available, and some of the forth files are very long.
75 */
76 struct includeline
77 {
78 struct includeline *next;
79 int flags;
80 int line;
81 #define SL_QUIET (1<<0)
82 #define SL_IGNOREERR (1<<1)
83 char text[0];
84 };
85
86 int
interp_include(const char * filename)87 interp_include(const char *filename)
88 {
89 struct includeline *script, *se, *sp;
90 char input[256]; /* big enough? */
91 int argc,res;
92 char **argv, *cp;
93 int fd, flags, line;
94
95 if (((fd = open(filename, O_RDONLY)) == -1)) {
96 snprintf(command_errbuf, sizeof(command_errbuf),
97 "can't open '%s': %s", filename, strerror(errno));
98 return(CMD_ERROR);
99 }
100
101 #ifdef LOADER_VERIEXEC
102 if (verify_file(fd, filename, 0, VE_GUESS, __func__) < 0) {
103 close(fd);
104 sprintf(command_errbuf,"can't verify '%s'", filename);
105 return(CMD_ERROR);
106 }
107 #endif
108
109 /*
110 * Read the script into memory.
111 */
112 script = se = NULL;
113 line = 0;
114
115 while (fgetstr(input, sizeof(input), fd) >= 0) {
116 line++;
117 flags = 0;
118 /* Discard comments */
119 if (strncmp(input+strspn(input, " "), "\\", 1) == 0)
120 continue;
121 cp = input;
122 /* Echo? */
123 if (input[0] == '@') {
124 cp++;
125 flags |= SL_QUIET;
126 }
127 /* Error OK? */
128 if (input[0] == '-') {
129 cp++;
130 flags |= SL_IGNOREERR;
131 }
132
133 /* Allocate script line structure and copy line, flags */
134 if (*cp == '\0')
135 continue; /* ignore empty line, save memory */
136 sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
137 /* On malloc failure (it happens!), free as much as possible and exit */
138 if (sp == NULL) {
139 while (script != NULL) {
140 se = script;
141 script = script->next;
142 free(se);
143 }
144 snprintf(command_errbuf, sizeof(command_errbuf),
145 "file '%s' line %d: memory allocation failure - aborting",
146 filename, line);
147 close(fd);
148 return (CMD_ERROR);
149 }
150 strcpy(sp->text, cp);
151 sp->flags = flags;
152 sp->line = line;
153 sp->next = NULL;
154
155 if (script == NULL) {
156 script = sp;
157 } else {
158 se->next = sp;
159 }
160 se = sp;
161 }
162 close(fd);
163
164 /*
165 * Execute the script
166 */
167 argv = NULL;
168 res = CMD_OK;
169 for (sp = script; sp != NULL; sp = sp->next) {
170
171 /* print if not being quiet */
172 if (!(sp->flags & SL_QUIET)) {
173 interp_emit_prompt();
174 printf("%s\n", sp->text);
175 }
176
177 /* Parse the command */
178 if (!parse(&argc, &argv, sp->text)) {
179 if ((argc > 0) && (interp_builtin_cmd(argc, argv) != 0)) {
180 /* normal command */
181 printf("%s: %s\n", argv[0], command_errmsg);
182 if (!(sp->flags & SL_IGNOREERR)) {
183 res=CMD_ERROR;
184 break;
185 }
186 }
187 free(argv);
188 argv = NULL;
189 } else {
190 printf("%s line %d: parse error\n", filename, sp->line);
191 res=CMD_ERROR;
192 break;
193 }
194 }
195 if (argv != NULL)
196 free(argv);
197
198 while (script != NULL) {
199 se = script;
200 script = script->next;
201 free(se);
202 }
203 return(res);
204 }
205
206 /*
207 * There's no graphics commands for the simple interpreter.
208 */
209 void
gfx_interp_ref(void)210 gfx_interp_ref(void)
211 {
212 }
213