interp.c revision 50477
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 * $FreeBSD: head/sys/boot/common/interp.c 50477 1999-08-28 01:08:13Z peter $ 27 */ 28/* 29 * Simple commandline interpreter, toplevel and misc. 30 * 31 * XXX may be obsoleted by BootFORTH or some other, better, interpreter. 32 */ 33 34#include <stand.h> 35#include <string.h> 36#include "bootstrap.h" 37 38#ifdef BOOT_FORTH 39#include "ficl.h" 40#define RETURN(x) stackPushINT32(bf_vm->pStack,!x); return(x) 41 42extern FICL_VM *bf_vm; 43#else 44#define RETURN(x) return(x) 45#endif 46 47#define MAXARGS 20 /* maximum number of arguments allowed */ 48 49static void prompt(void); 50 51/* 52 * Perform the command 53 */ 54int 55perform(int argc, char *argv[]) 56{ 57 int result; 58 struct bootblk_command **cmdp; 59 bootblk_cmd_t *cmd; 60 61 if (argc < 1) 62 return(CMD_OK); 63 64 /* set return defaults; a successful command will override these */ 65 command_errmsg = command_errbuf; 66 strcpy(command_errbuf, "no error message"); 67 cmd = NULL; 68 result = CMD_ERROR; 69 70 /* search the command set for the command */ 71 SET_FOREACH(cmdp, Xcommand_set) { 72 if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name)) 73 cmd = (*cmdp)->c_fn; 74 } 75 if (cmd != NULL) { 76 result = (cmd)(argc, argv); 77 } else { 78 command_errmsg = "unknown command"; 79 } 80 RETURN(result); 81} 82 83/* 84 * Interactive mode 85 */ 86void 87interact(void) 88{ 89 char input[256]; /* big enough? */ 90#ifndef BOOT_FORTH 91 int argc; 92 char **argv; 93#endif 94 95#ifdef BOOT_FORTH 96 bf_init(); 97#endif 98 99 /* 100 * Read our default configuration 101 */ 102 if(include("/boot/loader.rc")!=CMD_OK) 103 include("/boot/boot.conf"); 104 printf("\n"); 105 /* 106 * Before interacting, we might want to autoboot. 107 */ 108 autoboot_maybe(); 109 110 /* 111 * Not autobooting, go manual 112 */ 113 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 114 if (getenv("prompt") == NULL) 115 setenv("prompt", "${currdev}>", 1); 116 117 118 for (;;) { 119 input[0] = '\0'; 120 prompt(); 121 ngets(input, sizeof(input)); 122#ifdef BOOT_FORTH 123 bf_run(input); 124#else 125 if (!parse(&argc, &argv, input)) { 126 if (perform(argc, argv)) 127 printf("%s: %s\n", argv[0], command_errmsg); 128 free(argv); 129 } else { 130 printf("parse error\n"); 131 } 132#endif 133 } 134} 135 136/* 137 * Read commands from a file, then execute them. 138 * 139 * We store the commands in memory and close the source file so that the media 140 * holding it can safely go away while we are executing. 141 * 142 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 143 * that the script won't stop if they fail). 144 */ 145COMMAND_SET(include, "include", "read commands from a file", command_include); 146 147static int 148command_include(int argc, char *argv[]) 149{ 150 int i; 151 int res; 152 char **argvbuf; 153 154 /* 155 * Since argv is static, we need to save it here. 156 */ 157 argvbuf = (char**) calloc(argc, sizeof(char*)); 158 for (i = 0; i < argc; i++) 159 argvbuf[i] = strdup(argv[i]); 160 161 res=CMD_OK; 162 for (i = 1; (i < argc) && (res == CMD_OK); i++) 163 res = include(argvbuf[i]); 164 165 for (i = 0; i < argc; i++) 166 free(argvbuf[i]); 167 free(argvbuf); 168 169 return(res); 170} 171 172struct includeline 173{ 174 char *text; 175 int flags; 176 int line; 177#define SL_QUIET (1<<0) 178#define SL_IGNOREERR (1<<1) 179 struct includeline *next; 180}; 181 182int 183include(char *filename) 184{ 185 struct includeline *script, *se, *sp; 186 char input[256]; /* big enough? */ 187#ifdef BOOT_FORTH 188 int res; 189 char *cp; 190 int fd, line; 191#else 192 int argc,res; 193 char **argv, *cp; 194 int fd, flags, line; 195#endif 196 197 if (((fd = open(filename, O_RDONLY)) == -1)) { 198 sprintf(command_errbuf,"can't open '%s': %s\n", filename, strerror(errno)); 199 return(CMD_ERROR); 200 } 201 202 /* 203 * Read the script into memory. 204 */ 205 script = se = NULL; 206 line = 0; 207 208 while (fgetstr(input, sizeof(input), fd) >= 0) { 209 line++; 210#ifdef BOOT_FORTH 211 cp = input; 212#else 213 flags = 0; 214 /* Discard comments */ 215 if (input[0] == '#') 216 continue; 217 cp = input; 218 /* Echo? */ 219 if (input[0] == '@') { 220 cp++; 221 flags |= SL_QUIET; 222 } 223 /* Error OK? */ 224 if (input[0] == '-') { 225 cp++; 226 flags |= SL_IGNOREERR; 227 } 228#endif 229 /* Allocate script line structure and copy line, flags */ 230 sp = malloc(sizeof(struct includeline) + strlen(cp) + 1); 231 sp->text = (char *)sp + sizeof(struct includeline); 232 strcpy(sp->text, cp); 233#ifndef BOOT_FORTH 234 sp->flags = flags; 235#endif 236 sp->line = line; 237 sp->next = NULL; 238 239 if (script == NULL) { 240 script = sp; 241 } else { 242 se->next = sp; 243 } 244 se = sp; 245 } 246 close(fd); 247 248 /* 249 * Execute the script 250 */ 251#ifndef BOOT_FORTH 252 argv = NULL; 253#endif 254 res = CMD_OK; 255 for (sp = script; sp != NULL; sp = sp->next) { 256 257#ifdef BOOT_FORTH 258 res = bf_run(sp->text); 259 if (res != VM_OUTOFTEXT) { 260 sprintf(command_errbuf, "Error while including %s, in the line:\n%s", filename, sp->text); 261 res = CMD_ERROR; 262 break; 263 } else 264 res = CMD_OK; 265#else 266 /* print if not being quiet */ 267 if (!(sp->flags & SL_QUIET)) { 268 prompt(); 269 printf("%s\n", sp->text); 270 } 271 272 /* Parse the command */ 273 if (!parse(&argc, &argv, sp->text)) { 274 if ((argc > 0) && (perform(argc, argv) != 0)) { 275 /* normal command */ 276 printf("%s: %s\n", argv[0], command_errmsg); 277 if (!(sp->flags & SL_IGNOREERR)) { 278 res=CMD_ERROR; 279 break; 280 } 281 } 282 free(argv); 283 argv = NULL; 284 } else { 285 printf("%s line %d: parse error\n", filename, sp->line); 286 res=CMD_ERROR; 287 break; 288 } 289#endif 290 } 291#ifndef BOOT_FORTH 292 if (argv != NULL) 293 free(argv); 294#endif 295 while(script != NULL) { 296 se = script; 297 script = script->next; 298 free(se); 299 } 300 return(res); 301} 302 303/* 304 * Emit the current prompt; use the same syntax as the parser 305 * for embedding environment variables. 306 */ 307static void 308prompt(void) 309{ 310 char *pr, *p, *cp, *ev; 311 312 if ((cp = getenv("prompt")) == NULL) 313 cp = ">"; 314 pr = p = strdup(cp); 315 316 while (*p != 0) { 317 if ((*p == '$') && (*(p+1) == '{')) { 318 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 319 ; 320 *cp = 0; 321 ev = getenv(p + 2); 322 323 if (ev != NULL) 324 printf(ev); 325 p = cp + 1; 326 continue; 327 } 328 putchar(*p++); 329 } 330 putchar(' '); 331 free(pr); 332} 333