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 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 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 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 205 gfx_interp_ref(void) 206 { 207 } 208