1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 2011 Wojciech A. Koszek <wkoszek@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 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 #include "interp.h" 40 41 42 #define MAXARGS 20 /* maximum number of arguments allowed */ 43 44 struct interp *interp = 45 #if defined(BOOT_FORTH) 46 &boot_interp_forth; 47 #else 48 &boot_interp_simple; 49 #endif 50 51 int 52 default_load_config(void *ctx) 53 { 54 return INTERP_INCL(interp, "/boot/loader.rc"); 55 } 56 57 /* 58 * Interactive mode 59 */ 60 void 61 interact(const char * rc) 62 { 63 static char input[256]; /* big enough? */ 64 65 INTERP_INIT(interp); 66 67 /* 68 * Read our default configuration 69 */ 70 INTERP_LOAD_DEF_CONFIG(interp); 71 printf("\n"); 72 /* 73 * Before interacting, we might want to autoboot. 74 */ 75 autoboot_maybe(); 76 77 /* 78 * Not autobooting, go manual 79 */ 80 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 81 if (getenv("prompt") == NULL) 82 setenv("prompt", "${interpret}", 1); 83 if (getenv("interpret") == NULL) 84 setenv("interpret", "OK", 1); 85 86 87 for (;;) { 88 input[0] = '\0'; 89 prompt(); 90 ngets(input, sizeof(input)); 91 INTERP_RUN(interp, input); 92 } 93 } 94 95 /* 96 * Read commands from a file, then execute them. 97 * 98 * We store the commands in memory and close the source file so that the media 99 * holding it can safely go away while we are executing. 100 * 101 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 102 * that the script won't stop if they fail). 103 */ 104 COMMAND_SET(include, "include", "read commands from a file", command_include); 105 106 static int 107 command_include(int argc, char *argv[]) 108 { 109 int i; 110 int res; 111 char **argvbuf; 112 113 /* 114 * Since argv is static, we need to save it here. 115 */ 116 argvbuf = (char**) calloc((u_int)argc, sizeof(char*)); 117 for (i = 0; i < argc; i++) 118 argvbuf[i] = strdup(argv[i]); 119 120 res=CMD_OK; 121 for (i = 1; (i < argc) && (res == CMD_OK); i++) 122 res = INTERP_INCL(interp, argvbuf[i]); 123 124 for (i = 0; i < argc; i++) 125 free(argvbuf[i]); 126 free(argvbuf); 127 128 return(res); 129 } 130 131 /* 132 * Perform the command 133 */ 134 int 135 perform(int argc, char *argv[]) 136 { 137 int result; 138 struct bootblk_command **cmdp; 139 bootblk_cmd_t *cmd; 140 141 if (argc < 1) 142 return(CMD_OK); 143 144 /* set return defaults; a successful command will override these */ 145 command_errmsg = command_errbuf; 146 strcpy(command_errbuf, "no error message"); 147 cmd = NULL; 148 result = CMD_ERROR; 149 150 /* search the command set for the command */ 151 SET_FOREACH(cmdp, Xcommand_set) { 152 if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name)) 153 cmd = (*cmdp)->c_fn; 154 } 155 if (cmd != NULL) { 156 result = (cmd)(argc, argv); 157 } else { 158 command_errmsg = "unknown command"; 159 } 160 return result; 161 } 162 163 /* 164 * Emit the current prompt; use the same syntax as the parser 165 * for embedding environment variables. 166 */ 167 void 168 prompt(void) 169 { 170 char *pr, *p, *cp, *ev; 171 172 if ((cp = getenv("prompt")) == NULL) 173 cp = ">"; 174 pr = p = strdup(cp); 175 176 while (*p != 0) { 177 if ((*p == '$') && (*(p+1) == '{')) { 178 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 179 ; 180 *cp = 0; 181 ev = getenv(p + 2); 182 183 if (ev != NULL) 184 printf("%s", ev); 185 p = cp + 1; 186 continue; 187 } 188 putchar(*p++); 189 } 190 putchar(' '); 191 free(pr); 192 } 193