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("$FreeBSD$"); 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 #define MAXARGS 20 /* maximum number of arguments allowed */ 41 42 /* 43 * Interactive mode 44 */ 45 void 46 interact(void) 47 { 48 static char input[256]; /* big enough? */ 49 const char * volatile interp_identifier; 50 51 /* 52 * Because interp_identifier is volatile, it cannot be optimized out by 53 * the compiler as it's considered an externally observable event. This 54 * prevents the compiler from optimizing out our carefully placed 55 * $Interpreter:4th string that userboot may use to determine that 56 * we need to switch interpreters. 57 */ 58 interp_identifier = bootprog_interp; 59 interp_init(); 60 61 printf("\n"); 62 63 /* 64 * Before interacting, we might want to autoboot. 65 */ 66 autoboot_maybe(); 67 68 /* 69 * Not autobooting, go manual 70 */ 71 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 72 if (getenv("prompt") == NULL) 73 setenv("prompt", "${interpret}", 1); 74 if (getenv("interpret") == NULL) 75 setenv("interpret", "OK", 1); 76 77 for (;;) { 78 input[0] = '\0'; 79 interp_emit_prompt(); 80 ngets(input, sizeof(input)); 81 interp_run(input); 82 } 83 } 84 85 /* 86 * Read commands from a file, then execute them. 87 * 88 * We store the commands in memory and close the source file so that the media 89 * holding it can safely go away while we are executing. 90 * 91 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 92 * that the script won't stop if they fail). 93 */ 94 COMMAND_SET(include, "include", "read commands from a file", command_include); 95 96 static int 97 command_include(int argc, char *argv[]) 98 { 99 int i; 100 int res; 101 char **argvbuf; 102 103 /* 104 * Since argv is static, we need to save it here. 105 */ 106 argvbuf = (char**) calloc((u_int)argc, sizeof(char*)); 107 for (i = 0; i < argc; i++) 108 argvbuf[i] = strdup(argv[i]); 109 110 res=CMD_OK; 111 for (i = 1; (i < argc) && (res == CMD_OK); i++) 112 res = interp_include(argvbuf[i]); 113 114 for (i = 0; i < argc; i++) 115 free(argvbuf[i]); 116 free(argvbuf); 117 118 return(res); 119 } 120 121 /* 122 * Emit the current prompt; use the same syntax as the parser 123 * for embedding environment variables. Does not accept input. 124 */ 125 void 126 interp_emit_prompt(void) 127 { 128 char *pr, *p, *cp, *ev; 129 130 if ((cp = getenv("prompt")) == NULL) 131 cp = ">"; 132 pr = p = strdup(cp); 133 134 while (*p != 0) { 135 if ((*p == '$') && (*(p+1) == '{')) { 136 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 137 ; 138 *cp = 0; 139 ev = getenv(p + 2); 140 141 if (ev != NULL) 142 printf("%s", ev); 143 p = cp + 1; 144 continue; 145 } 146 putchar(*p++); 147 } 148 putchar(' '); 149 free(pr); 150 } 151 152 /* 153 * Perform a builtin command 154 */ 155 int 156 interp_builtin_cmd(int argc, char *argv[]) 157 { 158 int result; 159 struct bootblk_command **cmdp; 160 bootblk_cmd_t *cmd; 161 162 if (argc < 1) 163 return(CMD_OK); 164 165 /* set return defaults; a successful command will override these */ 166 command_errmsg = command_errbuf; 167 strcpy(command_errbuf, "no error message"); 168 cmd = NULL; 169 result = CMD_ERROR; 170 171 /* search the command set for the command */ 172 SET_FOREACH(cmdp, Xcommand_set) { 173 if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name)) 174 cmd = (*cmdp)->c_fn; 175 } 176 if (cmd != NULL) { 177 result = (cmd)(argc, argv); 178 } else { 179 command_errmsg = "unknown command"; 180 } 181 return(result); 182 } 183