interp.c revision 42289
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 1.9 1998/12/22 11:41:51 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 source("/boot/boot.conf"); 103 printf("\n"); 104 /* 105 * Before interacting, we might want to autoboot. 106 */ 107 autoboot_maybe(); 108 109 /* 110 * Not autobooting, go manual 111 */ 112 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 113 setenv("prompt", "${currdev}>", 1); 114 115 116 for (;;) { 117 input[0] = '\0'; 118 prompt(); 119 ngets(input, sizeof(input)); 120#ifdef BOOT_FORTH 121 bf_run(input); 122#else 123 if (!parse(&argc, &argv, input)) { 124 if (perform(argc, argv)) 125 printf("%s: %s\n", argv[0], command_errmsg); 126 free(argv); 127 } else { 128 printf("parse error\n"); 129 } 130#endif 131 } 132} 133 134/* 135 * Read commands from a file, then execute them. 136 * 137 * We store the commands in memory and close the source file so that the media 138 * holding it can safely go away while we are executing. 139 * 140 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 141 * that the script won't stop if they fail). 142 */ 143COMMAND_SET(source, "source", "read commands from a file", command_source); 144 145static int 146command_source(int argc, char *argv[]) 147{ 148 int i; 149 150 for (i = 1; i < argc; i++) 151 source(argv[i]); 152 RETURN(CMD_OK); 153} 154 155struct sourceline 156{ 157 char *text; 158 int flags; 159 int line; 160#define SL_QUIET (1<<0) 161#define SL_IGNOREERR (1<<1) 162 struct sourceline *next; 163}; 164 165void 166source(char *filename) 167{ 168 struct sourceline *script, *se, *sp; 169 char input[256]; /* big enough? */ 170 int argc; 171 char **argv, *cp; 172 int fd, flags, line; 173 174 if (((fd = open(filename, O_RDONLY)) == -1)) { 175 printf("can't open '%s': %s\n", filename, strerror(errno)); 176 return; 177 } 178 179 /* 180 * Read the script into memory. 181 */ 182 script = se = NULL; 183 line = 0; 184 185 while (fgetstr(input, sizeof(input), fd) > 0) { 186 line++; 187 flags = 0; 188 /* Discard comments */ 189 if (input[0] == '#') 190 continue; 191 cp = input; 192 /* Echo? */ 193 if (input[0] == '@') { 194 cp++; 195 flags |= SL_QUIET; 196 } 197 /* Error OK? */ 198 if (input[0] == '-') { 199 cp++; 200 flags |= SL_IGNOREERR; 201 } 202 /* Allocate script line structure and copy line, flags */ 203 sp = malloc(sizeof(struct sourceline) + strlen(cp) + 1); 204 sp->text = (char *)sp + sizeof(struct sourceline); 205 strcpy(sp->text, cp); 206 sp->flags = flags; 207 sp->line = line; 208 sp->next = NULL; 209 210 if (script == NULL) { 211 script = sp; 212 } else { 213 se->next = sp; 214 } 215 se = sp; 216 } 217 close(fd); 218 219 /* 220 * Execute the script 221 */ 222 argv = NULL; 223 for (sp = script; sp != NULL; sp = sp->next) { 224 225 /* print if not being quiet */ 226 if (!(sp->flags & SL_QUIET)) { 227 prompt(); 228 printf("%s\n", sp->text); 229 } 230 231 /* Parse the command */ 232 if (!parse(&argc, &argv, sp->text)) { 233 if ((argc > 0) && (perform(argc, argv) != 0)) { 234 /* normal command */ 235 printf("%s: %s\n", argv[0], command_errmsg); 236 if (!(sp->flags & SL_IGNOREERR)) 237 break; 238 } 239 free(argv); 240 argv = NULL; 241 } else { 242 printf("%s line %d: parse error\n", filename, sp->line); 243 break; 244 } 245 } 246 if (argv != NULL) 247 free(argv); 248 while(script != NULL) { 249 se = script; 250 script = script->next; 251 free(se); 252 } 253} 254 255/* 256 * Emit the current prompt; use the same syntax as the parser 257 * for embedding environment variables. 258 */ 259static void 260prompt(void) 261{ 262 char *p, *cp, *ev; 263 264 if ((cp = getenv("prompt")) == NULL) 265 cp = ">"; 266 p = strdup(cp); 267 268 while (*p != 0) { 269 if ((*p == '$') && (*(p+1) == '{')) { 270 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 271 ; 272 *cp = 0; 273 ev = getenv(p + 2); 274 275 if (ev != NULL) 276 printf(ev); 277 p = cp + 1; 278 continue; 279 } 280 putchar(*p++); 281 } 282 putchar(' '); 283} 284