interp.c revision 42682
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 * $Id: interp.c,v 1.11 1999/01/13 21:59:58 abial Exp $ 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(source("/boot/loader.rc")!=CMD_OK) 103 source("/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 setenv("prompt", "${currdev}>", 1); 115 116 117 for (;;) { 118 input[0] = '\0'; 119 prompt(); 120 ngets(input, sizeof(input)); 121#ifdef BOOT_FORTH 122 bf_run(input); 123#else 124 if (!parse(&argc, &argv, input)) { 125 if (perform(argc, argv)) 126 printf("%s: %s\n", argv[0], command_errmsg); 127 free(argv); 128 } else { 129 printf("parse error\n"); 130 } 131#endif 132 } 133} 134 135/* 136 * Read commands from a file, then execute them. 137 * 138 * We store the commands in memory and close the source file so that the media 139 * holding it can safely go away while we are executing. 140 * 141 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 142 * that the script won't stop if they fail). 143 */ 144COMMAND_SET(source, "source", "read commands from a file", command_source); 145 146static int 147command_source(int argc, char *argv[]) 148{ 149 int i; 150 int res; 151 152 res=CMD_OK; 153 for (i = 1; (i < argc) && (res == CMD_OK); i++) 154 res=source(argv[i]); 155 return(res); 156} 157 158struct sourceline 159{ 160 char *text; 161 int flags; 162 int line; 163#define SL_QUIET (1<<0) 164#define SL_IGNOREERR (1<<1) 165 struct sourceline *next; 166}; 167 168int 169source(char *filename) 170{ 171 struct sourceline *script, *se, *sp; 172 char input[256]; /* big enough? */ 173 int argc,res; 174 char **argv, *cp; 175 int fd, flags, line; 176 177 if (((fd = open(filename, O_RDONLY)) == -1)) { 178 sprintf(command_errbuf,"can't open '%s': %s\n", filename, strerror(errno)); 179 return(CMD_ERROR); 180 } 181 182 /* 183 * Read the script into memory. 184 */ 185 script = se = NULL; 186 line = 0; 187 188 while (fgetstr(input, sizeof(input), fd) > 0) { 189 line++; 190 flags = 0; 191 /* Discard comments */ 192 if (input[0] == '#') 193 continue; 194 cp = input; 195 /* Echo? */ 196 if (input[0] == '@') { 197 cp++; 198 flags |= SL_QUIET; 199 } 200 /* Error OK? */ 201 if (input[0] == '-') { 202 cp++; 203 flags |= SL_IGNOREERR; 204 } 205 /* Allocate script line structure and copy line, flags */ 206 sp = malloc(sizeof(struct sourceline) + strlen(cp) + 1); 207 sp->text = (char *)sp + sizeof(struct sourceline); 208 strcpy(sp->text, cp); 209 sp->flags = flags; 210 sp->line = line; 211 sp->next = NULL; 212 213 if (script == NULL) { 214 script = sp; 215 } else { 216 se->next = sp; 217 } 218 se = sp; 219 } 220 close(fd); 221 222 /* 223 * Execute the script 224 */ 225 argv = NULL; 226 res = CMD_OK; 227 for (sp = script; sp != NULL; sp = sp->next) { 228 229 /* print if not being quiet */ 230 if (!(sp->flags & SL_QUIET)) { 231 prompt(); 232 printf("%s\n", sp->text); 233 } 234 235 /* Parse the command */ 236 if (!parse(&argc, &argv, sp->text)) { 237 if ((argc > 0) && (perform(argc, argv) != 0)) { 238 /* normal command */ 239 printf("%s: %s\n", argv[0], command_errmsg); 240 if (!(sp->flags & SL_IGNOREERR)) { 241 res=CMD_ERROR; 242 break; 243 } 244 } 245 free(argv); 246 argv = NULL; 247 } else { 248 printf("%s line %d: parse error\n", filename, sp->line); 249 res=CMD_ERROR; 250 break; 251 } 252 } 253 if (argv != NULL) 254 free(argv); 255 while(script != NULL) { 256 se = script; 257 script = script->next; 258 free(se); 259 } 260 return(res); 261} 262 263/* 264 * Emit the current prompt; use the same syntax as the parser 265 * for embedding environment variables. 266 */ 267static void 268prompt(void) 269{ 270 char *p, *cp, *ev; 271 272 if ((cp = getenv("prompt")) == NULL) 273 cp = ">"; 274 p = strdup(cp); 275 276 while (*p != 0) { 277 if ((*p == '$') && (*(p+1) == '{')) { 278 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 279 ; 280 *cp = 0; 281 ev = getenv(p + 2); 282 283 if (ev != NULL) 284 printf(ev); 285 p = cp + 1; 286 continue; 287 } 288 putchar(*p++); 289 } 290 putchar(' '); 291} 292