interp.c

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    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 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.2/sys/boot/common/interp.c 185132 2008-11-20 14:57:09Z luigi $");
   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     static 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      * Read our default configuration
  107      */
  108     if(include("/boot/loader.rc")!=CMD_OK)
  109         include("/boot/boot.conf");
  110     printf("\n");
  111     /*
  112      * Before interacting, we might want to autoboot.
  113      */
  114     autoboot_maybe();
  115     
  116     /*
  117      * Not autobooting, go manual
  118      */
  119     printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
  120     if (getenv("prompt") == NULL)
  121         setenv("prompt", "${interpret}", 1);
  122     if (getenv("interpret") == NULL)
  123         setenv("interpret", "OK", 1);
  124     
  125 
  126     for (;;) {
  127         input[0] = '\0';
  128         prompt();
  129         ngets(input, sizeof(input));
  130 #ifdef BOOT_FORTH
  131         bf_vm->sourceID.i = 0;
  132         bf_run(input);
  133 #else
  134         if (!parse(&argc, &argv, input)) {
  135             if (perform(argc, argv))
  136                 printf("%s: %s\n", argv[0], command_errmsg);
  137             free(argv);
  138         } else {
  139             printf("parse error\n");
  140         }
  141 #endif
  142     }
  143 }
  144 
  145 /*
  146  * Read commands from a file, then execute them.
  147  *
  148  * We store the commands in memory and close the source file so that the media
  149  * holding it can safely go away while we are executing.
  150  *
  151  * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
  152  * that the script won't stop if they fail).
  153  */
  154 COMMAND_SET(include, "include", "read commands from a file", command_include);
  155 
  156 static int
  157 command_include(int argc, char *argv[])
  158 {
  159     int         i;
  160     int         res;
  161     char        **argvbuf;
  162 
  163     /* 
  164      * Since argv is static, we need to save it here.
  165      */
  166     argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
  167     for (i = 0; i < argc; i++)
  168         argvbuf[i] = strdup(argv[i]);
  169 
  170     res=CMD_OK;
  171     for (i = 1; (i < argc) && (res == CMD_OK); i++)
  172         res = include(argvbuf[i]);
  173 
  174     for (i = 0; i < argc; i++)
  175         free(argvbuf[i]);
  176     free(argvbuf);
  177 
  178     return(res);
  179 }
  180 
  181 /*
  182  * Header prepended to each line. The text immediately follows the header.
  183  * We try to make this short in order to save memory -- the loader has
  184  * limited memory available, and some of the forth files are very long.
  185  */
  186 struct includeline 
  187 {
  188     struct includeline  *next;
  189 #ifndef BOOT_FORTH
  190     int                 flags;
  191     int                 line;
  192 #define SL_QUIET        (1<<0)
  193 #define SL_IGNOREERR    (1<<1)
  194 #endif
  195     char                text[0];
  196 };
  197 
  198 int
  199 include(const char *filename)
  200 {
  201     struct includeline  *script, *se, *sp;
  202     char                input[256];                     /* big enough? */
  203 #ifdef BOOT_FORTH
  204     int                 res;
  205     char                *cp;
  206     int                 prevsrcid, fd, line;
  207 #else
  208     int                 argc,res;
  209     char                **argv, *cp;
  210     int                 fd, flags, line;
  211 #endif
  212 
  213     if (((fd = open(filename, O_RDONLY)) == -1)) {
  214         sprintf(command_errbuf,"can't open '%s': %s\n", filename, strerror(errno));
  215         return(CMD_ERROR);
  216     }
  217 
  218     /*
  219      * Read the script into memory.
  220      */
  221     script = se = NULL;
  222     line = 0;
  223         
  224     while (fgetstr(input, sizeof(input), fd) >= 0) {
  225         line++;
  226 #ifdef BOOT_FORTH
  227         cp = input;
  228 #else
  229         flags = 0;
  230         /* Discard comments */
  231         if (strncmp(input+strspn(input, " "), "\\ ", 2) == 0)
  232             continue;
  233         cp = input;
  234         /* Echo? */
  235         if (input[0] == '@') {
  236             cp++;
  237             flags |= SL_QUIET;
  238         }
  239         /* Error OK? */
  240         if (input[0] == '-') {
  241             cp++;
  242             flags |= SL_IGNOREERR;
  243         }
  244 #endif
  245         /* Allocate script line structure and copy line, flags */
  246         if (*cp == '\0')
  247                 continue;       /* ignore empty line, save memory */
  248         sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
  249         strcpy(sp->text, cp);
  250 #ifndef BOOT_FORTH
  251         sp->flags = flags;
  252         sp->line = line;
  253 #endif
  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 }
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FreeBSD/Linux Kernel Cross Reference sys/boot/common/interp.c

FreeBSD/Linux Kernel Cross Reference
sys/boot/common/interp.c
