sys/boot/common/interp.c

   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: src/sys/boot/common/interp.c,v 1.29 2003/08/25 23:30:41 obrien Exp $
  27  * $DragonFly: src/sys/boot/common/interp.c,v 1.4 2008/09/02 17:21:12 dillon Exp $
  28  */
  29
  30 /*
  31  * Simple commandline interpreter, toplevel and misc.
  32  *
  33  * XXX may be obsoleted by BootFORTH or some other, better, interpreter.
  34  */
  35
  36 #include <stand.h>
  37 #include <string.h>
  38 #include "bootstrap.h"
  39
  40 #ifdef BOOT_FORTH
  41 #include "ficl.h"
  42 #define RETURN(x)       stackPushINT(bf_vm->pStack,!x); return(x)
  43
  44 extern FICL_VM *bf_vm;
  45 #else
  46 #define RETURN(x)       return(x)
  47 #endif
  48
  49 #define MAXARGS 20                      /* maximum number of arguments allowed */
  50
  51 static void     prompt(void);
  52
  53 #ifndef BOOT_FORTH
  54 static int      perform(int argc, char *argv[]);
  55
  56 /*
  57  * Perform the command
  58  */
  59 int
  60 perform(int argc, char *argv[])
  61 {
  62     int                         result;
  63     struct bootblk_command      **cmdp;
  64     bootblk_cmd_t               *cmd;
  65
  66     if (argc < 1)
  67         return(CMD_OK);
  68
  69     /* set return defaults; a successful command will override these */
  70     command_errmsg = command_errbuf;
  71     strcpy(command_errbuf, "no error message");
  72     cmd = NULL;
  73     result = CMD_ERROR;
  74
  75     /* search the command set for the command */
  76     SET_FOREACH(cmdp, Xcommand_set) {
  77         if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name))
  78             cmd = (*cmdp)->c_fn;
  79     }
  80     if (cmd != NULL) {
  81         result = (cmd)(argc, argv);
  82     } else {
  83         command_errmsg = "unknown command";
  84     }
  85     RETURN(result);
  86 }
  87 #endif  /* ! BOOT_FORTH */
  88
  89 /*
  90  * Interactive mode
  91  */
  92 void
  93 interact(void)
  94 {
  95     char        input[256];                     /* big enough? */
  96 #ifndef BOOT_FORTH
  97     int         argc;
  98     char        **argv;
  99 #endif
 100
 101 #ifdef BOOT_FORTH
 102     bf_init();
 103 #endif
 104
 105     /*
 106      * We may be booting from the boot partition, or we may be booting
 107      * from the root partition with a /boot sub-directory.  If the latter
 108      * chdir into /boot.  Ignore any error.  Only rel_open() uses the chdir
 109      * info.
 110      */
 111     chdir("/boot");
 112
 113     /*
 114      * Read our default configuration
 115      */
 116     if(include("loader.rc")!=CMD_OK)
 117         include("boot.conf");
 118     printf("\n");
 119     /*
 120      * Before interacting, we might want to autoboot.
 121      */
 122     autoboot_maybe();
 123
 124     /*
 125      * Not autobooting, go manual
 126      */
 127     printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
 128     if (getenv("prompt") == NULL)
 129         setenv("prompt", "${interpret}", 1);
 130     if (getenv("interpret") == NULL)
 131         setenv("interpret", "OK", 1);
 132
 133
 134     for (;;) {
 135         input[0] = '\0';
 136         prompt();
 137         ngets(input, sizeof(input));
 138 #ifdef BOOT_FORTH
 139         bf_vm->sourceID.i = 0;
 140         bf_run(input);
 141 #else
 142         if (!parse(&argc, &argv, input)) {
 143             if (perform(argc, argv))
 144                 printf("%s: %s\n", argv[0], command_errmsg);
 145             free(argv);
 146         } else {
 147             printf("parse error\n");
 148         }
 149 #endif
 150     }
 151 }
 152
 153 /*
 154  * Read commands from a file, then execute them.
 155  *
 156  * We store the commands in memory and close the source file so that the media
 157  * holding it can safely go away while we are executing.
 158  *
 159  * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
 160  * that the script won't stop if they fail).
 161  */
 162 COMMAND_SET(include, "include", "read commands from a file", command_include);
 163
 164 static int
 165 command_include(int argc, char *argv[])
 166 {
 167     int         i;
 168     int         res;
 169     char        **argvbuf;
 170
 171     /*
 172      * Since argv is static, we need to save it here.
 173      */
 174     argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
 175     for (i = 0; i < argc; i++)
 176         argvbuf[i] = strdup(argv[i]);
 177
 178     res=CMD_OK;
 179     for (i = 1; (i < argc) && (res == CMD_OK); i++)
 180         res = include(argvbuf[i]);
 181
 182     for (i = 0; i < argc; i++)
 183         free(argvbuf[i]);
 184     free(argvbuf);
 185
 186     return(res);
 187 }
 188
 189 struct includeline
 190 {
 191     char                *text;
 192     int                 flags;
 193     int                 line;
 194 #define SL_QUIET        (1<<0)
 195 #define SL_IGNOREERR    (1<<1)
 196     struct includeline  *next;
 197 };
 198
 199 int
 200 include(const char *filename)
 201 {
 202     struct includeline  *script, *se, *sp;
 203     char                input[256];                     /* big enough? */
 204 #ifdef BOOT_FORTH
 205     int                 res;
 206     char                *cp;
 207     int                 prevsrcid, fd, line;
 208 #else
 209     int                 argc,res;
 210     char                **argv, *cp;
 211     int                 fd, flags, line;
 212 #endif
 213
 214     if (((fd = rel_open(filename, O_RDONLY)) == -1)) {
 215         sprintf(command_errbuf,"can't open '%s': %s\n", filename, strerror(errno));
 216         return(CMD_ERROR);
 217     }
 218
 219     /*
 220      * Read the script into memory.
 221      */
 222     script = se = NULL;
 223     line = 0;
 224
 225     while (fgetstr(input, sizeof(input), fd) >= 0) {
 226         line++;
 227 #ifdef BOOT_FORTH
 228         cp = input;
 229 #else
 230         flags = 0;
 231         /* Discard comments */
 232         if (strncmp(input+strspn(input, " "), "\\ ", 2) == 0)
 233             continue;
 234         cp = input;
 235         /* Echo? */
 236         if (input[0] == '@') {
 237             cp++;
 238             flags |= SL_QUIET;
 239         }
 240         /* Error OK? */
 241         if (input[0] == '-') {
 242             cp++;
 243             flags |= SL_IGNOREERR;
 244         }
 245 #endif
 246         /* Allocate script line structure and copy line, flags */
 247         sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
 248         sp->text = (char *)sp + sizeof(struct includeline);
 249         strcpy(sp->text, cp);
 250 #ifndef BOOT_FORTH
 251         sp->flags = flags;
 252 #endif
 253         sp->line = line;
 254         sp->next = NULL;
 255
 256         if (script == NULL) {
 257             script = sp;
 258         } else {
 259             se->next = sp;
 260         }
 261         se = sp;
 262     }
 263     close(fd);
 264
 265     /*
 266      * Execute the script
 267      */
 268 #ifndef BOOT_FORTH
 269     argv = NULL;
 270 #else
 271     prevsrcid = bf_vm->sourceID.i;
 272     bf_vm->sourceID.i = fd;
 273 #endif
 274     res = CMD_OK;
 275     for (sp = script; sp != NULL; sp = sp->next) {
 276
 277 #ifdef BOOT_FORTH
 278         res = bf_run(sp->text);
 279         if (res != VM_OUTOFTEXT) {
 280                 sprintf(command_errbuf, "Error while including %s, in the line:\n%s", filename, sp->text);
 281                 res = CMD_ERROR;
 282                 break;
 283         } else
 284                 res = CMD_OK;
 285 #else
 286         /* print if not being quiet */
 287         if (!(sp->flags & SL_QUIET)) {
 288             prompt();
 289             printf("%s\n", sp->text);
 290         }
 291
 292         /* Parse the command */
 293         if (!parse(&argc, &argv, sp->text)) {
 294             if ((argc > 0) && (perform(argc, argv) != 0)) {
 295                 /* normal command */
 296                 printf("%s: %s\n", argv[0], command_errmsg);
 297                 if (!(sp->flags & SL_IGNOREERR)) {
 298                     res=CMD_ERROR;
 299                     break;
 300                 }
 301             }
 302             free(argv);
 303             argv = NULL;
 304         } else {
 305             printf("%s line %d: parse error\n", filename, sp->line);
 306             res=CMD_ERROR;
 307             break;
 308         }
 309 #endif
 310     }
 311 #ifndef BOOT_FORTH
 312     if (argv != NULL)
 313         free(argv);
 314 #else
 315     bf_vm->sourceID.i = prevsrcid;
 316 #endif
 317     while(script != NULL) {
 318         se = script;
 319         script = script->next;
 320         free(se);
 321     }
 322     return(res);
 323 }
 324
 325 /*
 326  * Emit the current prompt; use the same syntax as the parser
 327  * for embedding environment variables.
 328  */
 329 static void
 330 prompt(void)
 331 {
 332     char        *pr, *p, *cp, *ev;
 333
 334     if ((cp = getenv("prompt")) == NULL)
 335         cp = ">";
 336     pr = p = strdup(cp);
 337
 338     while (*p != 0) {
 339         if ((*p == '$') && (*(p+1) == '{')) {
 340             for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
 341                 ;
 342             *cp = 0;
 343             ev = getenv(p + 2);
 344
 345             if (ev != NULL)
 346                 printf("%s", ev);
 347             p = cp + 1;
 348             continue;
 349         }
 350         putchar(*p++);
 351     }
 352     putchar(' ');
 353     free(pr);
 354 }