NetBSD/sbin/bim/command.c

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1995-03-18 15:28:06 +03:00
/* $NetBSD: command.c,v 1.2 1995/03/18 12:28:15 cgd Exp $ */
/*
* Copyright (c) 1994 Philip A. Nelson.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Philip A. Nelson.
* 4. The name of Philip A. Nelson may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY PHILIP NELSON ``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 PHILIP NELSON 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.
*/
/*
* command.c - The routines to implement the command processor.
*
* The user must add to "cmdtable.h" all commands that are available.
*/
#include <stdio.h>
#include <ctype.h>
#include "command.h"
#include "cmdtable.h"
/* This allows the user to define the prompt in cmdtable.h */
#ifndef PROMPT
#define PROMPT "Command (? for help): "
#endif
/* Other procedure prototypes. */
PROTO (void prompt, (char *, int, char *));
PROTO (int parse, (char *, char **));
PROTO (CONST struct command *find_entry, (char *));
PROTO (int StrCmp, (char *, char *));
/* A pointer to a function to be called after every command.
A NULL pointer says no function is to be executed.
The int parameter is the "done" flag.. TRUE => last command */
PROTO (void (*after_cmd), (int)) = NULL;
/* This is the command processor loop. */
command_loop ()
{
char cmdline [LINELEN];
char *args [MAXARGS];
int numargs;
CONST struct command *cmd;
int done = FALSE;
int ix;
while (!done) {
prompt(cmdline, LINELEN, PROMPT);
numargs = parse (cmdline, args);
if (numargs == BLANK_LINE) continue;
cmd = find_entry (args[0]);
if (cmd != NULL)
{
done = (*(cmd->fn)) (numargs, args, cmd->syntax);
if (after_cmd != NULL)
(*(after_cmd)) (done);
}
else
printf ("Unknown command\n");
}
}
/* This is the command processor for a single command. */
int
one_command (cmdline)
char *cmdline;
{
char *args [MAXARGS];
int numargs;
CONST struct command *cmd;
int done;
numargs = parse (cmdline, args);
if (numargs == BLANK_LINE) return 0;
cmd = find_entry (args[0]);
if (cmd != NULL)
{
done = (*(cmd->fn)) (numargs, args, cmd->syntax);
if (after_cmd != NULL)
(*(after_cmd)) (done);
return done;
}
else
return 0;
}
/* prompt procedure.... Write out the prompt and then read
a response. */
void prompt (cmdline, linelen, promptstr)
char *cmdline;
int linelen;
char *promptstr;
{
int incount = 0;
int inchar;
/* Give the prompt. */
printf ("%s", promptstr);
fflush (stdout);
/* Read chars until newline or EOF, toss chars that won't fit in the
array. */
while (TRUE)
{
inchar = getchar();
if (inchar == '\n' || inchar == EOF) break;
if (++incount < linelen) *cmdline++ = inchar;
}
*cmdline = 0;
}
/* parse the arguments on an input line. It returns an array of
pointers to substrings in the original string. It puts the string
terminator in the original line. */
int parse (cmdline, args)
char *cmdline;
char **args;
{
int index;
int argcnt = BLANK_LINE;
/* Initialize the args. */
for (index = 0; index < MAXARGS; index++)
args[index] = NULL;
/* Start looking for the commands */
while (*cmdline != 0)
{
while (isspace(*cmdline)) cmdline++; /* skip blanks. */
if (*cmdline != 0)
{
/* Start of new argument. */
if (argcnt < MAXARGS) args[argcnt] = cmdline;
while (!isspace(*cmdline) && *cmdline != 0) cmdline++;
if (*cmdline != 0) *cmdline++ = 0;
argcnt++;
}
}
return (argcnt < MAXARGS ? argcnt : MAXARGS -1);
}
/* Search cmd_tbl for 1) a command matching what the user typed or 2)
* a unique command which is a superstring of what the user typed.
*/
CONST struct command *
find_entry (name)
char *name;
{
CONST struct command *item, *save;
int subcount = 0;
for (item = cmd_table; item < cmd_table + CMDLEN; item++)
switch (StrCmp (name, item->name)) {
case CMP_MATCH:
return item;
case CMP_SUBSTR:
subcount++;
save = item;
break;
case CMP_NOMATCH:
break;
}
return (subcount == 1)? save : NULL;
}
/* Returns CMP_MATCH if strings are the same, CMP_SUBSTR if p1 is a
* proper substring of p2, and CMP_NOMATCH if neither.
*/
int
StrCmp (p1, p2)
register char *p1, *p2;
{
while (*p1 == *p2 && *p1 != '\0') {
++p1;
++p2;
}
if (*p1 == '\0')
return (*p2 == '\0')? CMP_MATCH: CMP_SUBSTR;
return CMP_NOMATCH;
}
/* Other routines that may be helpful in evaluating arguments....
*/
int
Str2Int (str, num)
char *str;
int *num;
{
if (!isdigit(*str) && *str != '-') return FALSE;
*num = atoi (str);
return TRUE;
}
#ifndef NO_HELP
/* "?" command handler. Print help and list of commands.
*/
help_cmds ()
{
CONST struct command *q;
printf("\nFor additional help, type HELP <command>. Commands are:\n");
for (q = cmd_table; q < cmd_table + CMDLEN; ++q)
if ((q - cmd_table) % 5 == 4)
printf ("%s\n", q -> name);
else
printf ("%-15s", q -> name);
if ((q - cmd_table) % 5 != 0)
printf ("\n");
printf ("\n");
}
/* The default help routine. This may be redefined by the user. */
int help (num, args, syntax)
int num;
char **args;
char *syntax;
{
CONST struct command *item;
int index;
int show_cmds = FALSE;
char dummy[2];
if (args[0][0] == '?') num = 1; /* Force "no args" for ?. */
/* Print help for each argument. */
if (num > 1)
for (index = 1; index < num; index++)
{
item = find_entry (args[index]);
if (item != NULL)
{
printf ("\n");
if (item -> syntax[0] != 0)
printf ("Syntax: %s\n", item -> syntax);
printf ("%s\n\n", item -> help);
if (index < num-1) prompt (dummy, 1, "cr to continue:");
}
else
{
printf ("unknow command %s.\n", args[index]);
show_cmds = TRUE;
}
}
if (show_cmds || num == 1)
help_cmds ();
return FALSE;
}
#endif