NetBSD/sbin/bim/command.c

282 lines
7.0 KiB
C

/* $NetBSD: command.c,v 1.7 2006/09/04 01:20:14 simonb 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: command.c,v 1.7 2006/09/04 01:20:14 simonb Exp $");
#endif /* not lint */
/*
* command.c - The routines to implement the command processor.
*
* The user must add to "cmdtable.h" all commands that are available.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include "command.h"
#include "cmdtable.h"
#include "extern.h"
/* This allows the user to define the prompt in cmdtable.h */
#ifndef PROMPT
#define PROMPT "Command (? for help): "
#endif
/* Other procedure prototypes. */
const struct command *find_entry(char *);
void help_cmds(void);
int parse(char *, char **);
int StrCmp(const char *, const 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 */
void (*after_cmd)(int) = NULL;
/* This is the command processor loop. */
void
command_loop(void)
{
char cmdline[LINELEN];
char *args[MAXARGS];
int numargs;
const struct command *cmd;
int done = FALSE;
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(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(char *cmdline, int linelen, const 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(char *cmdline, char **args)
{
int idx;
int argcnt = BLANK_LINE;
/* Initialize the args. */
for (idx = 0; idx < MAXARGS; idx++)
args[idx] = NULL;
/* Start looking for the commands */
while (*cmdline != 0) {
while (isspace((unsigned char)*cmdline))
cmdline++; /* skip blanks. */
if (*cmdline != 0) {
/* Start of new argument. */
if (argcnt < MAXARGS)
args[argcnt] = cmdline;
while (!isspace((unsigned char)*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(char *name)
{
const struct command *item, *save;
int subcount = 0;
save = NULL;
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(const char *p1, const char *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(char *str, int *num)
{
if (!isdigit((unsigned char)*str) && *str != '-')
return FALSE;
*num = atoi(str);
return TRUE;
}
#ifndef NO_HELP
/* "?" command handler. Print help and list of commands. */
void
help_cmds(void)
{
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(int num, char **args, const char *syntax)
{
const struct command *item;
int idx;
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 (idx = 1; idx < num; idx++) {
item = find_entry(args[idx]);
if (item != NULL) {
printf("\n");
if (item->syntax[0] != 0)
printf("Syntax: %s\n", item->syntax);
printf("%s\n\n", item->help);
if (idx < num - 1)
prompt(dummy, 1, "cr to continue:");
} else {
printf("unknow command %s.\n", args[idx]);
show_cmds = TRUE;
}
}
if (show_cmds || num == 1)
help_cmds();
return FALSE;
}
#endif