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 /* 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 #define MAXARGS 20 /* maximum number of arguments allowed */ 39 40 const char * volatile interp_identifier; 41 42 /* 43 * Interactive mode 44 */ 45 void 46 interact(void) 47 { 48 static char input[256]; /* big enough? */ 49 50 TSENTER(); 51 52 /* 53 * Because interp_identifier is volatile, it cannot be optimized out by 54 * the compiler as it's considered an externally observable event. This 55 * prevents the compiler from optimizing out our carefully placed 56 * $Interpreter:4th string that userboot may use to determine that 57 * we need to switch interpreters. 58 */ 59 interp_identifier = bootprog_interp; 60 interp_init(); 61 62 printf("\n"); 63 64 /* 65 * Before interacting, we might want to autoboot. 66 */ 67 autoboot_maybe(); 68 69 /* 70 * Not autobooting, go manual 71 */ 72 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 73 if (getenv("prompt") == NULL) 74 setenv("prompt", "${interpret}", 1); 75 if (getenv("interpret") == NULL) 76 setenv("interpret", "OK", 1); 77 78 for (;;) { 79 input[0] = '\0'; 80 interp_emit_prompt(); 81 ngets(input, sizeof(input)); 82 interp_run(input); 83 } 84 } 85 86 /* 87 * Read commands from a file, then execute them. 88 * 89 * We store the commands in memory and close the source file so that the media 90 * holding it can safely go away while we are executing. 91 * 92 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 93 * that the script won't stop if they fail). 94 */ 95 COMMAND_SET(include, "include", "read commands from a file", command_include); 96 97 static int 98 command_include(int argc, char *argv[]) 99 { 100 int i; 101 int res; 102 char **argvbuf; 103 104 /* 105 * Since argv is static, we need to save it here. 106 */ 107 argvbuf = (char**) calloc((u_int)argc, sizeof(char*)); 108 for (i = 0; i < argc; i++) 109 argvbuf[i] = strdup(argv[i]); 110 111 res=CMD_OK; 112 for (i = 1; (i < argc) && (res == CMD_OK); i++) 113 res = interp_include(argvbuf[i]); 114 115 for (i = 0; i < argc; i++) 116 free(argvbuf[i]); 117 free(argvbuf); 118 119 return(res); 120 } 121 122 /* 123 * Emit the current prompt; use the same syntax as the parser 124 * for embedding environment variables. Does not accept input. 125 */ 126 void 127 interp_emit_prompt(void) 128 { 129 char *pr, *p, *cp, *ev; 130 131 if ((cp = getenv("prompt")) == NULL) 132 cp = ">"; 133 pr = p = strdup(cp); 134 135 while (*p != 0) { 136 if ((*p == '$') && (*(p+1) == '{')) { 137 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 138 ; 139 *cp = 0; 140 ev = getenv(p + 2); 141 142 if (ev != NULL) 143 printf("%s", ev); 144 p = cp + 1; 145 continue; 146 } 147 putchar(*p++); 148 } 149 putchar(' '); 150 free(pr); 151 } 152 153 static struct bootblk_command * 154 interp_lookup_cmd(const char *cmd) 155 { 156 struct bootblk_command **cmdp; 157 158 /* search the command set for the command */ 159 SET_FOREACH(cmdp, Xcommand_set) { 160 if (((*cmdp)->c_name != NULL) && !strcmp(cmd, (*cmdp)->c_name)) 161 return (*cmdp); 162 } 163 return (NULL); 164 } 165 166 /* 167 * Perform a builtin command 168 */ 169 int 170 interp_builtin_cmd(int argc, char *argv[]) 171 { 172 int result; 173 struct bootblk_command *cmd; 174 175 if (argc < 1) 176 return (CMD_OK); 177 178 /* set return defaults; a successful command will override these */ 179 command_errmsg = command_errbuf; 180 strcpy(command_errbuf, "no error message"); 181 result = CMD_ERROR; 182 183 cmd = interp_lookup_cmd(argv[0]); 184 if (cmd != NULL && cmd->c_fn) { 185 result = cmd->c_fn(argc, argv); 186 } else { 187 command_errmsg = "unknown command"; 188 } 189 return (result); 190 } 191 192 /* 193 * Return true if the builtin command exists 194 */ 195 bool 196 interp_has_builtin_cmd(const char *cmd) 197 { 198 return (interp_lookup_cmd(cmd) != NULL); 199 } 200