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 34 #include <stand.h> 35 #include <string.h> 36 #include "bootstrap.h" 37 38 void 39 interp_init(void) 40 { 41 42 setenv("script.lang", "simple", 1); 43 /* Read our default configuration. */ 44 interp_include("/boot/loader.rc"); 45 } 46 47 int 48 interp_run(const char *input) 49 { 50 int argc; 51 char **argv; 52 53 if (parse(&argc, &argv, input)) { 54 printf("parse error\n"); 55 return CMD_ERROR; 56 } 57 58 if (interp_builtin_cmd(argc, argv)) { 59 printf("%s: %s\n", argv[0], command_errmsg); 60 free(argv); 61 return CMD_ERROR; 62 } 63 free(argv); 64 return CMD_OK; 65 } 66 67 /* 68 * Header prepended to each line. The text immediately follows the header. 69 * We try to make this short in order to save memory -- the loader has 70 * limited memory available, and some of the forth files are very long. 71 */ 72 struct includeline 73 { 74 struct includeline *next; 75 int flags; 76 int line; 77 #define SL_QUIET (1<<0) 78 #define SL_IGNOREERR (1<<1) 79 char text[0]; 80 }; 81 82 int 83 interp_include(const char *filename) 84 { 85 struct includeline *script, *se, *sp; 86 char input[256]; /* big enough? */ 87 int argc,res; 88 char **argv, *cp; 89 int fd, flags, line; 90 91 if (((fd = open(filename, O_RDONLY)) == -1)) { 92 snprintf(command_errbuf, sizeof(command_errbuf), 93 "can't open '%s': %s", filename, strerror(errno)); 94 return(CMD_ERROR); 95 } 96 97 /* 98 * Read the script into memory. 99 */ 100 script = se = NULL; 101 line = 0; 102 103 while (fgetstr(input, sizeof(input), fd) >= 0) { 104 line++; 105 flags = 0; 106 /* Discard comments */ 107 if (strncmp(input+strspn(input, " "), "\\ ", 2) == 0) 108 continue; 109 cp = input; 110 /* Echo? */ 111 if (input[0] == '@') { 112 cp++; 113 flags |= SL_QUIET; 114 } 115 /* Error OK? */ 116 if (input[0] == '-') { 117 cp++; 118 flags |= SL_IGNOREERR; 119 } 120 121 /* Allocate script line structure and copy line, flags */ 122 if (*cp == '\0') 123 continue; /* ignore empty line, save memory */ 124 sp = malloc(sizeof(struct includeline) + strlen(cp) + 1); 125 /* On malloc failure (it happens!), free as much as possible and exit */ 126 if (sp == NULL) { 127 while (script != NULL) { 128 se = script; 129 script = script->next; 130 free(se); 131 } 132 snprintf(command_errbuf, sizeof(command_errbuf), 133 "file '%s' line %d: memory allocation failure - aborting", 134 filename, line); 135 close(fd); 136 return (CMD_ERROR); 137 } 138 strcpy(sp->text, cp); 139 sp->flags = flags; 140 sp->line = line; 141 sp->next = NULL; 142 143 if (script == NULL) { 144 script = sp; 145 } else { 146 se->next = sp; 147 } 148 se = sp; 149 } 150 close(fd); 151 152 /* 153 * Execute the script 154 */ 155 argv = NULL; 156 res = CMD_OK; 157 for (sp = script; sp != NULL; sp = sp->next) { 158 159 /* print if not being quiet */ 160 if (!(sp->flags & SL_QUIET)) { 161 interp_emit_prompt(); 162 printf("%s\n", sp->text); 163 } 164 165 /* Parse the command */ 166 if (!parse(&argc, &argv, sp->text)) { 167 if ((argc > 0) && (interp_builtin_cmd(argc, argv) != 0)) { 168 /* normal command */ 169 printf("%s: %s\n", argv[0], command_errmsg); 170 if (!(sp->flags & SL_IGNOREERR)) { 171 res=CMD_ERROR; 172 break; 173 } 174 } 175 free(argv); 176 argv = NULL; 177 } else { 178 printf("%s line %d: parse error\n", filename, sp->line); 179 res=CMD_ERROR; 180 break; 181 } 182 } 183 if (argv != NULL) 184 free(argv); 185 186 while (script != NULL) { 187 se = script; 188 script = script->next; 189 free(se); 190 } 191 return(res); 192 } 193