1 /*-
2 * Copyright (c) 1998 Michael Smith <[email protected]>
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_init(void)38 interp_init(void)
39 {
40
41 setenv("script.lang", "simple", 1);
42 /* Read our default configuration. */
43 interp_include("/boot/loader.rc");
44 }
45
46 int
interp_run(const char * input)47 interp_run(const char *input)
48 {
49 int argc;
50 char **argv;
51
52 if (parse(&argc, &argv, input)) {
53 printf("parse error\n");
54 return CMD_ERROR;
55 }
56
57 if (interp_builtin_cmd(argc, argv)) {
58 printf("%s: %s\n", argv[0], command_errmsg);
59 free(argv);
60 return CMD_ERROR;
61 }
62 free(argv);
63 return CMD_OK;
64 }
65
66 /*
67 * Header prepended to each line. The text immediately follows the header.
68 * We try to make this short in order to save memory -- the loader has
69 * limited memory available, and some of the forth files are very long.
70 */
71 struct includeline
72 {
73 struct includeline *next;
74 int flags;
75 int line;
76 #define SL_QUIET (1<<0)
77 #define SL_IGNOREERR (1<<1)
78 char text[0];
79 };
80
81 int
interp_include(const char * filename)82 interp_include(const char *filename)
83 {
84 struct includeline *script, *se, *sp;
85 char input[256]; /* big enough? */
86 int argc,res;
87 char **argv, *cp;
88 int fd, flags, line;
89
90 if (((fd = open(filename, O_RDONLY)) == -1)) {
91 snprintf(command_errbuf, sizeof(command_errbuf),
92 "can't open '%s': %s", filename, strerror(errno));
93 return(CMD_ERROR);
94 }
95
96 #ifdef LOADER_VERIEXEC
97 if (verify_file(fd, filename, 0, VE_GUESS, __func__) < 0) {
98 close(fd);
99 sprintf(command_errbuf,"can't verify '%s'", filename);
100 return(CMD_ERROR);
101 }
102 #endif
103
104 /*
105 * Read the script into memory.
106 */
107 script = se = NULL;
108 line = 0;
109
110 while (fgetstr(input, sizeof(input), fd) >= 0) {
111 line++;
112 flags = 0;
113 /* Discard comments */
114 if (strncmp(input+strspn(input, " "), "\\", 1) == 0)
115 continue;
116 cp = input;
117 /* Echo? */
118 if (input[0] == '@') {
119 cp++;
120 flags |= SL_QUIET;
121 }
122 /* Error OK? */
123 if (input[0] == '-') {
124 cp++;
125 flags |= SL_IGNOREERR;
126 }
127
128 /* Allocate script line structure and copy line, flags */
129 if (*cp == '\0')
130 continue; /* ignore empty line, save memory */
131 sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
132 /* On malloc failure (it happens!), free as much as possible and exit */
133 if (sp == NULL) {
134 while (script != NULL) {
135 se = script;
136 script = script->next;
137 free(se);
138 }
139 snprintf(command_errbuf, sizeof(command_errbuf),
140 "file '%s' line %d: memory allocation failure - aborting",
141 filename, line);
142 close(fd);
143 return (CMD_ERROR);
144 }
145 strcpy(sp->text, cp);
146 sp->flags = flags;
147 sp->line = line;
148 sp->next = NULL;
149
150 if (script == NULL) {
151 script = sp;
152 } else {
153 se->next = sp;
154 }
155 se = sp;
156 }
157 close(fd);
158
159 /*
160 * Execute the script
161 */
162 argv = NULL;
163 res = CMD_OK;
164 for (sp = script; sp != NULL; sp = sp->next) {
165
166 /* print if not being quiet */
167 if (!(sp->flags & SL_QUIET)) {
168 interp_emit_prompt();
169 printf("%s\n", sp->text);
170 }
171
172 /* Parse the command */
173 if (!parse(&argc, &argv, sp->text)) {
174 if ((argc > 0) && (interp_builtin_cmd(argc, argv) != 0)) {
175 /* normal command */
176 printf("%s: %s\n", argv[0], command_errmsg);
177 if (!(sp->flags & SL_IGNOREERR)) {
178 res=CMD_ERROR;
179 break;
180 }
181 }
182 free(argv);
183 argv = NULL;
184 } else {
185 printf("%s line %d: parse error\n", filename, sp->line);
186 res=CMD_ERROR;
187 break;
188 }
189 }
190 if (argv != NULL)
191 free(argv);
192
193 while (script != NULL) {
194 se = script;
195 script = script->next;
196 free(se);
197 }
198 return(res);
199 }
200
201 /*
202 * There's no graphics commands for the simple interpreter.
203 */
204 void
gfx_interp_ref(void)205 gfx_interp_ref(void)
206 {
207 }
208