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-rw-r--r--stand/common/interp.c371
1 files changed, 371 insertions, 0 deletions
diff --git a/stand/common/interp.c b/stand/common/interp.c
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+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Simple commandline interpreter, toplevel and misc.
+ *
+ * XXX may be obsoleted by BootFORTH or some other, better, interpreter.
+ */
+
+#include <stand.h>
+#include <string.h>
+#include "bootstrap.h"
+
+#ifdef BOOT_FORTH
+#include "ficl.h"
+#define RETURN(x) stackPushINT(bf_vm->pStack,!x); return(x)
+
+extern FICL_VM *bf_vm;
+#else
+#define RETURN(x) return(x)
+#endif
+
+#define MAXARGS 20 /* maximum number of arguments allowed */
+
+static void prompt(void);
+
+#ifndef BOOT_FORTH
+static int perform(int argc, char *argv[]);
+
+/*
+ * Perform the command
+ */
+int
+perform(int argc, char *argv[])
+{
+ int result;
+ struct bootblk_command **cmdp;
+ bootblk_cmd_t *cmd;
+
+ if (argc < 1)
+ return(CMD_OK);
+
+ /* set return defaults; a successful command will override these */
+ command_errmsg = command_errbuf;
+ strcpy(command_errbuf, "no error message");
+ cmd = NULL;
+ result = CMD_ERROR;
+
+ /* search the command set for the command */
+ SET_FOREACH(cmdp, Xcommand_set) {
+ if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name))
+ cmd = (*cmdp)->c_fn;
+ }
+ if (cmd != NULL) {
+ result = (cmd)(argc, argv);
+ } else {
+ command_errmsg = "unknown command";
+ }
+ RETURN(result);
+}
+#endif /* ! BOOT_FORTH */
+
+/*
+ * Interactive mode
+ */
+void
+interact(const char *rc)
+{
+ static char input[256]; /* big enough? */
+#ifndef BOOT_FORTH
+ int argc;
+ char **argv;
+#endif
+
+#ifdef BOOT_FORTH
+ bf_init((rc) ? "" : NULL);
+#endif
+
+ if (rc == NULL) {
+ /* Read our default configuration. */
+ include("/boot/loader.rc");
+ } else if (*rc != '\0')
+ include(rc);
+
+ printf("\n");
+
+ /*
+ * Before interacting, we might want to autoboot.
+ */
+ autoboot_maybe();
+
+ /*
+ * Not autobooting, go manual
+ */
+ printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
+ if (getenv("prompt") == NULL)
+ setenv("prompt", "${interpret}", 1);
+ if (getenv("interpret") == NULL)
+ setenv("interpret", "OK", 1);
+
+
+ for (;;) {
+ input[0] = '\0';
+ prompt();
+ ngets(input, sizeof(input));
+#ifdef BOOT_FORTH
+ bf_vm->sourceID.i = 0;
+ bf_run(input);
+#else
+ if (!parse(&argc, &argv, input)) {
+ if (perform(argc, argv))
+ printf("%s: %s\n", argv[0], command_errmsg);
+ free(argv);
+ } else {
+ printf("parse error\n");
+ }
+#endif
+ }
+}
+
+/*
+ * Read commands from a file, then execute them.
+ *
+ * We store the commands in memory and close the source file so that the media
+ * holding it can safely go away while we are executing.
+ *
+ * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
+ * that the script won't stop if they fail).
+ */
+COMMAND_SET(include, "include", "read commands from a file", command_include);
+
+static int
+command_include(int argc, char *argv[])
+{
+ int i;
+ int res;
+ char **argvbuf;
+
+ /*
+ * Since argv is static, we need to save it here.
+ */
+ argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
+ for (i = 0; i < argc; i++)
+ argvbuf[i] = strdup(argv[i]);
+
+ res=CMD_OK;
+ for (i = 1; (i < argc) && (res == CMD_OK); i++)
+ res = include(argvbuf[i]);
+
+ for (i = 0; i < argc; i++)
+ free(argvbuf[i]);
+ free(argvbuf);
+
+ return(res);
+}
+
+/*
+ * Header prepended to each line. The text immediately follows the header.
+ * We try to make this short in order to save memory -- the loader has
+ * limited memory available, and some of the forth files are very long.
+ */
+struct includeline
+{
+ struct includeline *next;
+#ifndef BOOT_FORTH
+ int flags;
+ int line;
+#define SL_QUIET (1<<0)
+#define SL_IGNOREERR (1<<1)
+#endif
+ char text[0];
+};
+
+int
+include(const char *filename)
+{
+ struct includeline *script, *se, *sp;
+ char input[256]; /* big enough? */
+#ifdef BOOT_FORTH
+ int res;
+ char *cp;
+ int prevsrcid, fd, line;
+#else
+ int argc,res;
+ char **argv, *cp;
+ int fd, flags, line;
+#endif
+
+ if (((fd = open(filename, O_RDONLY)) == -1)) {
+ snprintf(command_errbuf, sizeof(command_errbuf),
+ "can't open '%s': %s", filename, strerror(errno));
+ return(CMD_ERROR);
+ }
+
+ /*
+ * Read the script into memory.
+ */
+ script = se = NULL;
+ line = 0;
+
+ while (fgetstr(input, sizeof(input), fd) >= 0) {
+ line++;
+#ifdef BOOT_FORTH
+ cp = input;
+#else
+ flags = 0;
+ /* Discard comments */
+ if (strncmp(input+strspn(input, " "), "\\ ", 2) == 0)
+ continue;
+ cp = input;
+ /* Echo? */
+ if (input[0] == '@') {
+ cp++;
+ flags |= SL_QUIET;
+ }
+ /* Error OK? */
+ if (input[0] == '-') {
+ cp++;
+ flags |= SL_IGNOREERR;
+ }
+#endif
+ /* Allocate script line structure and copy line, flags */
+ if (*cp == '\0')
+ continue; /* ignore empty line, save memory */
+ sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
+ /* On malloc failure (it happens!), free as much as possible and exit */
+ if (sp == NULL) {
+ while (script != NULL) {
+ se = script;
+ script = script->next;
+ free(se);
+ }
+ snprintf(command_errbuf, sizeof(command_errbuf),
+ "file '%s' line %d: memory allocation failure - aborting",
+ filename, line);
+ return (CMD_ERROR);
+ }
+ strcpy(sp->text, cp);
+#ifndef BOOT_FORTH
+ sp->flags = flags;
+ sp->line = line;
+#endif
+ sp->next = NULL;
+
+ if (script == NULL) {
+ script = sp;
+ } else {
+ se->next = sp;
+ }
+ se = sp;
+ }
+ close(fd);
+
+ /*
+ * Execute the script
+ */
+#ifndef BOOT_FORTH
+ argv = NULL;
+#else
+ prevsrcid = bf_vm->sourceID.i;
+ bf_vm->sourceID.i = fd;
+#endif
+ res = CMD_OK;
+ for (sp = script; sp != NULL; sp = sp->next) {
+
+#ifdef BOOT_FORTH
+ res = bf_run(sp->text);
+ if (res != VM_OUTOFTEXT) {
+ snprintf(command_errbuf, sizeof(command_errbuf),
+ "Error while including %s, in the line:\n%s",
+ filename, sp->text);
+ res = CMD_ERROR;
+ break;
+ } else
+ res = CMD_OK;
+#else
+ /* print if not being quiet */
+ if (!(sp->flags & SL_QUIET)) {
+ prompt();
+ printf("%s\n", sp->text);
+ }
+
+ /* Parse the command */
+ if (!parse(&argc, &argv, sp->text)) {
+ if ((argc > 0) && (perform(argc, argv) != 0)) {
+ /* normal command */
+ printf("%s: %s\n", argv[0], command_errmsg);
+ if (!(sp->flags & SL_IGNOREERR)) {
+ res=CMD_ERROR;
+ break;
+ }
+ }
+ free(argv);
+ argv = NULL;
+ } else {
+ printf("%s line %d: parse error\n", filename, sp->line);
+ res=CMD_ERROR;
+ break;
+ }
+#endif
+ }
+#ifndef BOOT_FORTH
+ if (argv != NULL)
+ free(argv);
+#else
+ bf_vm->sourceID.i = prevsrcid;
+#endif
+ while(script != NULL) {
+ se = script;
+ script = script->next;
+ free(se);
+ }
+ return(res);
+}
+
+/*
+ * Emit the current prompt; use the same syntax as the parser
+ * for embedding environment variables.
+ */
+static void
+prompt(void)
+{
+ char *pr, *p, *cp, *ev;
+
+ if ((cp = getenv("prompt")) == NULL)
+ cp = ">";
+ pr = p = strdup(cp);
+
+ while (*p != 0) {
+ if ((*p == '$') && (*(p+1) == '{')) {
+ for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
+ ;
+ *cp = 0;
+ ev = getenv(p + 2);
+
+ if (ev != NULL)
+ printf("%s", ev);
+ p = cp + 1;
+ continue;
+ }
+ putchar(*p++);
+ }
+ putchar(' ');
+ free(pr);
+}
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