292 lines
7.1 KiB
C
292 lines
7.1 KiB
C
/* $NetBSD: command.c,v 1.2 1995/03/18 12:28:15 cgd Exp $ */
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/*
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* Copyright (c) 1994 Philip A. Nelson.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Philip A. Nelson.
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* 4. The name of Philip A. Nelson may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PHILIP NELSON ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL PHILIP NELSON BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* command.c - The routines to implement the command processor.
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*
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* The user must add to "cmdtable.h" all commands that are available.
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include "command.h"
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#include "cmdtable.h"
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/* This allows the user to define the prompt in cmdtable.h */
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#ifndef PROMPT
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#define PROMPT "Command (? for help): "
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#endif
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/* Other procedure prototypes. */
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PROTO (void prompt, (char *, int, char *));
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PROTO (int parse, (char *, char **));
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PROTO (CONST struct command *find_entry, (char *));
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PROTO (int StrCmp, (char *, char *));
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/* A pointer to a function to be called after every command.
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A NULL pointer says no function is to be executed.
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The int parameter is the "done" flag.. TRUE => last command */
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PROTO (void (*after_cmd), (int)) = NULL;
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/* This is the command processor loop. */
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command_loop ()
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{
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char cmdline [LINELEN];
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char *args [MAXARGS];
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int numargs;
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CONST struct command *cmd;
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int done = FALSE;
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int ix;
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while (!done) {
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prompt(cmdline, LINELEN, PROMPT);
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numargs = parse (cmdline, args);
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if (numargs == BLANK_LINE) continue;
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cmd = find_entry (args[0]);
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if (cmd != NULL)
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{
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done = (*(cmd->fn)) (numargs, args, cmd->syntax);
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if (after_cmd != NULL)
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(*(after_cmd)) (done);
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}
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else
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printf ("Unknown command\n");
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}
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}
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/* This is the command processor for a single command. */
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int
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one_command (cmdline)
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char *cmdline;
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{
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char *args [MAXARGS];
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int numargs;
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CONST struct command *cmd;
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int done;
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numargs = parse (cmdline, args);
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if (numargs == BLANK_LINE) return 0;
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cmd = find_entry (args[0]);
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if (cmd != NULL)
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{
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done = (*(cmd->fn)) (numargs, args, cmd->syntax);
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if (after_cmd != NULL)
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(*(after_cmd)) (done);
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return done;
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}
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else
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return 0;
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}
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/* prompt procedure.... Write out the prompt and then read
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a response. */
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void prompt (cmdline, linelen, promptstr)
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char *cmdline;
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int linelen;
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char *promptstr;
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{
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int incount = 0;
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int inchar;
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/* Give the prompt. */
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printf ("%s", promptstr);
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fflush (stdout);
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/* Read chars until newline or EOF, toss chars that won't fit in the
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array. */
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while (TRUE)
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{
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inchar = getchar();
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if (inchar == '\n' || inchar == EOF) break;
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if (++incount < linelen) *cmdline++ = inchar;
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}
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*cmdline = 0;
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}
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/* parse the arguments on an input line. It returns an array of
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pointers to substrings in the original string. It puts the string
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terminator in the original line. */
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int parse (cmdline, args)
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char *cmdline;
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char **args;
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{
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int index;
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int argcnt = BLANK_LINE;
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/* Initialize the args. */
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for (index = 0; index < MAXARGS; index++)
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args[index] = NULL;
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/* Start looking for the commands */
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while (*cmdline != 0)
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{
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while (isspace(*cmdline)) cmdline++; /* skip blanks. */
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if (*cmdline != 0)
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{
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/* Start of new argument. */
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if (argcnt < MAXARGS) args[argcnt] = cmdline;
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while (!isspace(*cmdline) && *cmdline != 0) cmdline++;
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if (*cmdline != 0) *cmdline++ = 0;
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argcnt++;
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}
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}
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return (argcnt < MAXARGS ? argcnt : MAXARGS -1);
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}
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/* Search cmd_tbl for 1) a command matching what the user typed or 2)
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* a unique command which is a superstring of what the user typed.
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*/
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CONST struct command *
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find_entry (name)
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char *name;
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{
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CONST struct command *item, *save;
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int subcount = 0;
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for (item = cmd_table; item < cmd_table + CMDLEN; item++)
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switch (StrCmp (name, item->name)) {
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case CMP_MATCH:
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return item;
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case CMP_SUBSTR:
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subcount++;
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save = item;
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break;
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case CMP_NOMATCH:
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break;
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}
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return (subcount == 1)? save : NULL;
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}
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/* Returns CMP_MATCH if strings are the same, CMP_SUBSTR if p1 is a
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* proper substring of p2, and CMP_NOMATCH if neither.
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*/
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int
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StrCmp (p1, p2)
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register char *p1, *p2;
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{
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while (*p1 == *p2 && *p1 != '\0') {
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++p1;
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++p2;
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}
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if (*p1 == '\0')
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return (*p2 == '\0')? CMP_MATCH: CMP_SUBSTR;
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return CMP_NOMATCH;
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}
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/* Other routines that may be helpful in evaluating arguments....
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*/
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int
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Str2Int (str, num)
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char *str;
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int *num;
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{
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if (!isdigit(*str) && *str != '-') return FALSE;
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*num = atoi (str);
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return TRUE;
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}
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#ifndef NO_HELP
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/* "?" command handler. Print help and list of commands.
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*/
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help_cmds ()
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{
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CONST struct command *q;
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printf("\nFor additional help, type HELP <command>. Commands are:\n");
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for (q = cmd_table; q < cmd_table + CMDLEN; ++q)
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if ((q - cmd_table) % 5 == 4)
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printf ("%s\n", q -> name);
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else
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printf ("%-15s", q -> name);
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if ((q - cmd_table) % 5 != 0)
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printf ("\n");
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printf ("\n");
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}
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/* The default help routine. This may be redefined by the user. */
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int help (num, args, syntax)
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int num;
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char **args;
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char *syntax;
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{
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CONST struct command *item;
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int index;
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int show_cmds = FALSE;
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char dummy[2];
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if (args[0][0] == '?') num = 1; /* Force "no args" for ?. */
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/* Print help for each argument. */
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if (num > 1)
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for (index = 1; index < num; index++)
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{
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item = find_entry (args[index]);
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if (item != NULL)
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{
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printf ("\n");
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if (item -> syntax[0] != 0)
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printf ("Syntax: %s\n", item -> syntax);
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printf ("%s\n\n", item -> help);
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if (index < num-1) prompt (dummy, 1, "cr to continue:");
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}
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else
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{
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printf ("unknow command %s.\n", args[index]);
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show_cmds = TRUE;
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}
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}
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if (show_cmds || num == 1)
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help_cmds ();
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return FALSE;
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}
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#endif
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