282 lines
7.0 KiB
C
282 lines
7.0 KiB
C
/* $NetBSD: command.c,v 1.7 2006/09/04 01:20:14 simonb 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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: command.c,v 1.7 2006/09/04 01:20:14 simonb Exp $");
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#endif /* not lint */
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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 <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "command.h"
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#include "cmdtable.h"
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#include "extern.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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const struct command *find_entry(char *);
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void help_cmds(void);
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int parse(char *, char **);
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int StrCmp(const char *, const 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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void (*after_cmd)(int) = NULL;
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/* This is the command processor loop. */
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void
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command_loop(void)
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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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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)
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continue;
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cmd = find_entry(args[0]);
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if (cmd != NULL) {
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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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} 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(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)
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return 0;
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cmd = find_entry(args[0]);
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if (cmd != NULL) {
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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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} else
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return 0;
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}
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/* prompt procedure.... Write out the prompt and then read a response. */
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void
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prompt(char *cmdline, int linelen, const 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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inchar = getchar();
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if (inchar == '\n' || inchar == EOF)
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break;
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if (++incount < linelen)
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*cmdline++ = inchar;
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}
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*cmdline = 0;
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}
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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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*/
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int
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parse(char *cmdline, char **args)
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{
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int idx;
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int argcnt = BLANK_LINE;
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/* Initialize the args. */
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for (idx = 0; idx < MAXARGS; idx++)
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args[idx] = NULL;
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/* Start looking for the commands */
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while (*cmdline != 0) {
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while (isspace((unsigned char)*cmdline))
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cmdline++; /* skip blanks. */
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if (*cmdline != 0) {
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/* Start of new argument. */
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if (argcnt < MAXARGS)
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args[argcnt] = cmdline;
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while (!isspace((unsigned char)*cmdline) &&
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*cmdline != 0)
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cmdline++;
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if (*cmdline != 0)
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*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(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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save = NULL;
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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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/*
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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(const char *p1, const char *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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int
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Str2Int(char *str, int *num)
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{
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if (!isdigit((unsigned char)*str) && *str != '-')
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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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void
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help_cmds(void)
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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
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help(int num, char **args, const char *syntax)
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{
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const struct command *item;
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int idx;
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int show_cmds = FALSE;
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char dummy[2];
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if (args[0][0] == '?')
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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 (idx = 1; idx < num; idx++) {
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item = find_entry(args[idx]);
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if (item != NULL) {
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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 (idx < num - 1)
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prompt(dummy, 1, "cr to continue:");
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} else {
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printf("unknow command %s.\n", args[idx]);
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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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