79a6a17abd
akin to what Pedro Souza and Wojciech Koszek did in the lua GSoC with interp.h, interp_simple.c and changes to interp.c and interp_forth.c, but completely redone from scratch. This effectively restores the spirit of r326712 (my first attempt to bring in Pedro's and Wojciech's work) updated for new requirements that had silently broke their original work. This change also differs by using fixed function names instead of function pointers to simply things. Only one interpreter at a time may be compiled in. Also of note: we take a mutable string, pass it in via a const char * pointer into intrp_forth's interp_run(). We then cast away the const to pass into ficlExec since ficl would require extensive changes to properly const-poison. See Sections 6.5.2.5 and 6.7.3 of C11 standard noting it's only UB if you modify a const object through a non-const pointer, but not char [] -> const char * -> char * as here.
142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Simple commandline interpreter, toplevel and misc.
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*
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* XXX may be obsoleted by BootFORTH or some other, better, interpreter.
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*/
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#include <stand.h>
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#include <string.h>
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#include "bootstrap.h"
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#define MAXARGS 20 /* maximum number of arguments allowed */
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/*
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* Interactive mode
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*/
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void
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interact(void)
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{
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static char input[256]; /* big enough? */
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interp_init();
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printf("\n");
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/*
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* Before interacting, we might want to autoboot.
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*/
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autoboot_maybe();
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/*
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* Not autobooting, go manual
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*/
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printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
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if (getenv("prompt") == NULL)
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setenv("prompt", "${interpret}", 1);
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if (getenv("interpret") == NULL)
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setenv("interpret", "OK", 1);
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for (;;) {
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input[0] = '\0';
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interp_emit_prompt();
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ngets(input, sizeof(input));
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interp_run(input);
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}
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}
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/*
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* Read commands from a file, then execute them.
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*
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* We store the commands in memory and close the source file so that the media
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* holding it can safely go away while we are executing.
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*
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* Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
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* that the script won't stop if they fail).
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*/
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COMMAND_SET(include, "include", "read commands from a file", command_include);
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static int
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command_include(int argc, char *argv[])
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{
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int i;
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int res;
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char **argvbuf;
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/*
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* Since argv is static, we need to save it here.
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*/
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argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
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for (i = 0; i < argc; i++)
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argvbuf[i] = strdup(argv[i]);
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res=CMD_OK;
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for (i = 1; (i < argc) && (res == CMD_OK); i++)
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res = interp_include(argvbuf[i]);
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for (i = 0; i < argc; i++)
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free(argvbuf[i]);
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free(argvbuf);
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return(res);
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}
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/*
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* Emit the current prompt; use the same syntax as the parser
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* for embedding environment variables. Does not accept input.
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*/
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void
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interp_emit_prompt(void)
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{
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char *pr, *p, *cp, *ev;
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if ((cp = getenv("prompt")) == NULL)
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cp = ">";
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pr = p = strdup(cp);
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while (*p != 0) {
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if ((*p == '$') && (*(p+1) == '{')) {
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for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
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;
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*cp = 0;
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ev = getenv(p + 2);
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if (ev != NULL)
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printf("%s", ev);
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p = cp + 1;
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continue;
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}
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putchar(*p++);
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}
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putchar(' ');
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free(pr);
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}
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