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 TSENTER(); 52 53 /* 54 * Because interp_identifier is volatile, it cannot be optimized out by 55 * the compiler as it's considered an externally observable event. This 56 * prevents the compiler from optimizing out our carefully placed 57 * $Interpreter:4th string that userboot may use to determine that 58 * we need to switch interpreters. 59 */ 60 interp_identifier = bootprog_interp; 61 interp_init(); 62 63 printf("\n"); 64 65 /* 66 * Before interacting, we might want to autoboot. 67 */ 68 autoboot_maybe(); 69 70 /* 71 * Not autobooting, go manual 72 */ 73 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 74 if (getenv("prompt") == NULL) 75 setenv("prompt", "${interpret}", 1); 76 if (getenv("interpret") == NULL) 77 setenv("interpret", "OK", 1); 78 79 for (;;) { 80 input[0] = '\0'; 81 interp_emit_prompt(); 82 ngets(input, sizeof(input)); 83 interp_run(input); 84 } 85 } 86 87 /* 88 * Read commands from a file, then execute them. 89 * 90 * We store the commands in memory and close the source file so that the media 91 * holding it can safely go away while we are executing. 92 * 93 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 94 * that the script won't stop if they fail). 95 */ 96 COMMAND_SET(include, "include", "read commands from a file", command_include); 97 98 static int 99 command_include(int argc, char *argv[]) 100 { 101 int i; 102 int res; 103 char **argvbuf; 104 105 /* 106 * Since argv is static, we need to save it here. 107 */ 108 argvbuf = (char**) calloc((u_int)argc, sizeof(char*)); 109 for (i = 0; i < argc; i++) 110 argvbuf[i] = strdup(argv[i]); 111 112 res=CMD_OK; 113 for (i = 1; (i < argc) && (res == CMD_OK); i++) 114 res = interp_include(argvbuf[i]); 115 116 for (i = 0; i < argc; i++) 117 free(argvbuf[i]); 118 free(argvbuf); 119 120 return(res); 121 } 122 123 /* 124 * Emit the current prompt; use the same syntax as the parser 125 * for embedding environment variables. Does not accept input. 126 */ 127 void 128 interp_emit_prompt(void) 129 { 130 char *pr, *p, *cp, *ev; 131 132 if ((cp = getenv("prompt")) == NULL) 133 cp = ">"; 134 pr = p = strdup(cp); 135 136 while (*p != 0) { 137 if ((*p == '$') && (*(p+1) == '{')) { 138 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 139 ; 140 *cp = 0; 141 ev = getenv(p + 2); 142 143 if (ev != NULL) 144 printf("%s", ev); 145 p = cp + 1; 146 continue; 147 } 148 putchar(*p++); 149 } 150 putchar(' '); 151 free(pr); 152 } 153 154 /* 155 * Perform a builtin command 156 */ 157 int 158 interp_builtin_cmd(int argc, char *argv[]) 159 { 160 int result; 161 struct bootblk_command **cmdp; 162 bootblk_cmd_t *cmd; 163 164 if (argc < 1) 165 return(CMD_OK); 166 167 /* set return defaults; a successful command will override these */ 168 command_errmsg = command_errbuf; 169 strcpy(command_errbuf, "no error message"); 170 cmd = NULL; 171 result = CMD_ERROR; 172 173 /* search the command set for the command */ 174 SET_FOREACH(cmdp, Xcommand_set) { 175 if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name)) 176 cmd = (*cmdp)->c_fn; 177 } 178 if (cmd != NULL) { 179 result = (cmd)(argc, argv); 180 } else { 181 command_errmsg = "unknown command"; 182 } 183 return(result); 184 } 185