1/* $NetBSD: interp.c,v 1.5 2012/12/27 20:21:51 martin Exp $ */ 2 3/*- 4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30/* __FBSDID("$FreeBSD: src/sys/boot/common/interp.c,v 1.29 2003/08/25 23:30:41 obrien Exp $"); */ 31 32/* 33 * Simple commandline interpreter, toplevel and misc. 34 * 35 * XXX may be obsoleted by BootFORTH or some other, better, interpreter. 36 */ 37 38#include <lib/libsa/stand.h> 39#include <lib/libsa/loadfile.h> 40#include <lib/libkern/libkern.h> 41 42#include "bootstrap.h" 43 44#ifdef BOOT_FORTH 45#include "ficl.h" 46#define RETURN(x) stackPushINT(bf_vm->pStack,!x); return(x) 47 48extern FICL_VM *bf_vm; 49#else 50#define RETURN(x) return(x) 51#endif 52 53#define MAXARGS 20 /* maximum number of arguments allowed */ 54 55static void prompt(void); 56 57#ifndef BOOT_FORTH 58static int perform(int argc, char *argv[]); 59 60/* 61 * Perform the command 62 */ 63int 64perform(int argc, char *argv[]) 65{ 66 int result; 67 struct bootblk_command *cmdp; 68 bootblk_cmd_t *cmd; 69 70 int i; 71 72 if (argc < 1) 73 return(CMD_OK); 74 75 /* set return defaults; a successful command will override these */ 76 command_seterr("no error message"); 77 cmd = NULL; 78 result = CMD_ERROR; 79 80 /* search the command set for the command */ 81 for (i = 0, cmdp = commands; (cmdp->c_name != NULL) && (cmdp->c_desc != NULL ); i++, cmdp = commands + i) { 82 if ((cmdp->c_name != NULL) && !strcmp(argv[0], cmdp->c_name)) 83 cmd = cmdp->c_fn; 84 } 85 if (cmd != NULL) { 86 result = (cmd)(argc, argv); 87 } else { 88 command_seterr("unknown command"); 89 } 90 RETURN(result); 91} 92#endif /* ! BOOT_FORTH */ 93 94/* 95 * Interactive mode 96 */ 97void 98interact(void) 99{ 100 char input[256]; /* big enough? */ 101#ifndef BOOT_FORTH 102 int argc; 103 char **argv; 104#endif 105 106#ifdef BOOT_FORTH 107 bf_init(); 108#endif 109 110 /* 111 * Read our default configuration 112 */ 113 if(include("/boot/loader.rc")!=CMD_OK) 114 include("/boot/boot.conf"); 115 printf("\n"); 116 117 /* 118 * XXX: Before interacting, we might want to autoboot. 119 */ 120 121 122 /* 123 * Not autobooting, go manual 124 */ 125 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 126 if (getenv("prompt") == NULL) 127 setenv("prompt", "${interpret}", 1); 128 if (getenv("interpret") == NULL) 129 setenv("interpret", "OK", 1); 130 131 132 for (;;) { 133 input[0] = '\0'; 134 prompt(); 135 ngets(input, sizeof(input)); 136#ifdef BOOT_FORTH 137 bf_vm->sourceID.i = 0; 138 bf_run(input); 139#else 140 if (!parse(&argc, &argv, input)) { 141 if (perform(argc, argv)) 142 printf("%s: %s\n", argv[0], command_geterr()); 143 free(argv); 144 } else { 145 printf("parse error\n"); 146 } 147#endif 148 } 149} 150 151/* 152 * Read commands from a file, then execute them. 153 * 154 * We store the commands in memory and close the source file so that the media 155 * holding it can safely go away while we are executing. 156 * 157 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 158 * that the script won't stop if they fail). 159 */ 160 161int 162command_include(int argc, char *argv[]) 163{ 164 int i; 165 int res; 166 char **argvbuf; 167 168 /* 169 * Since argv is static, we need to save it here. 170 */ 171 argvbuf = (char**) calloc((u_int)argc, sizeof(char*)); 172 for (i = 0; i < argc; i++) 173 argvbuf[i] = strdup(argv[i]); 174 175 res=CMD_OK; 176 for (i = 1; (i < argc) && (res == CMD_OK); i++) 177 res = include(argvbuf[i]); 178 179 for (i = 0; i < argc; i++) 180 free(argvbuf[i]); 181 free(argvbuf); 182 183 return(res); 184} 185 186struct includeline 187{ 188 char *text; 189 int flags; 190 int line; 191#define SL_QUIET (1<<0) 192#define SL_IGNOREERR (1<<1) 193 struct includeline *next; 194}; 195 196int 197include(const char *filename) 198{ 199 struct includeline *script, *se, *sp; 200 char input[256]; /* big enough? */ 201#ifdef BOOT_FORTH 202 int res; 203 char *cp; 204 int prevsrcid, fd, line; 205#else 206 int argc,res; 207 char **argv, *cp; 208 int fd, flags, line; 209#endif 210 211 if (((fd = open(filename, O_RDONLY)) == -1)) { 212 command_seterr("can't open '%s': %s\n", filename, strerror(errno)); 213 return(CMD_ERROR); 214 } 215 216 /* 217 * Read the script into memory. 218 */ 219 script = se = NULL; 220 line = 0; 221 222 while (fgetstr(input, sizeof(input), fd) >= 0) { 223 line++; 224#ifdef BOOT_FORTH 225 cp = input; 226#else 227 flags = 0; 228 /* Discard comments */ 229 if (strncmp(input+strspn(input, " "), "\\ ", 2) == 0) 230 continue; 231 cp = input; 232 /* Echo? */ 233 if (input[0] == '@') { 234 cp++; 235 flags |= SL_QUIET; 236 } 237 /* Error OK? */ 238 if (input[0] == '-') { 239 cp++; 240 flags |= SL_IGNOREERR; 241 } 242#endif 243 /* Allocate script line structure and copy line, flags */ 244 sp = alloc(sizeof(struct includeline) + strlen(cp) + 1); 245 sp->text = (char *)sp + sizeof(struct includeline); 246 strcpy(sp->text, cp); 247#ifndef BOOT_FORTH 248 sp->flags = flags; 249#endif 250 sp->line = line; 251 sp->next = NULL; 252 253 if (script == NULL) { 254 script = sp; 255 } else { 256 se->next = sp; 257 } 258 se = sp; 259 } 260 close(fd); 261 262 /* 263 * Execute the script 264 */ 265#ifndef BOOT_FORTH 266 argv = NULL; 267#else 268 prevsrcid = bf_vm->sourceID.i; 269 bf_vm->sourceID.i = fd; 270#endif 271 res = CMD_OK; 272 for (sp = script; sp != NULL; sp = sp->next) { 273 274#ifdef BOOT_FORTH 275 res = bf_run(sp->text); 276 if (res != VM_OUTOFTEXT) { 277 command_seterr("Error while including %s, in the line:\n%s", 278 filename, sp->text); 279 res = CMD_ERROR; 280 break; 281 } else 282 res = CMD_OK; 283#else 284 /* print if not being quiet */ 285 if (!(sp->flags & SL_QUIET)) { 286 prompt(); 287 printf("%s\n", sp->text); 288 } 289 290 /* Parse the command */ 291 if (!parse(&argc, &argv, sp->text)) { 292 if ((argc > 0) && (perform(argc, argv) != 0)) { 293 /* normal command */ 294 printf("%s: %s\n", argv[0], command_geterr()); 295 if (!(sp->flags & SL_IGNOREERR)) { 296 res=CMD_ERROR; 297 break; 298 } 299 } 300 free(argv); 301 argv = NULL; 302 } else { 303 printf("%s line %d: parse error\n", filename, sp->line); 304 res=CMD_ERROR; 305 break; 306 } 307#endif 308 } 309#ifndef BOOT_FORTH 310 if (argv != NULL) 311 free(argv); 312#else 313 bf_vm->sourceID.i = prevsrcid; 314#endif 315 while(script != NULL) { 316 se = script; 317 script = script->next; 318 free(se); 319 } 320 return(res); 321} 322 323/* 324 * Emit the current prompt; use the same syntax as the parser 325 * for embedding environment variables. 326 */ 327static void 328prompt(void) 329{ 330 char *pr, *p, *cp, *ev; 331 332 if ((cp = getenv("prompt")) == NULL) 333 cp = ">"; 334 pr = p = strdup(cp); 335 336 while (*p != 0) { 337 if ((*p == '$') && (*(p+1) == '{')) { 338 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 339 ; 340 *cp = 0; 341 ev = getenv(p + 2); 342 343 if (ev != NULL) 344 printf("%s", ev); 345 p = cp + 1; 346 continue; 347 } 348 putchar(*p++); 349 } 350 putchar(' '); 351 free(pr); 352} 353