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cmdparse.c
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C/C++ Source or Header
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1992-05-14
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/* @(#) $Header: cmdparse.c,v 1.6 92/05/14 13:19:48 deyke Exp $ */
/* Parse command line, set up command arguments Unix-style, and call function.
* Note: argument is modified (delimiters are overwritten with nulls)
*
* Copyright 1991 Phil Karn, KA9Q
*
* Improved error handling by Brian Boesch of Stanford University
* Feb '91 - Bill Simpson
* bit16cmd for PPP
* Mar '91 - Glenn McGregor
* handle string escaped sequences
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "proc.h"
#include "cmdparse.h"
struct boolcmd {
char *str; /* Token */
int val; /* Value */
};
static struct boolcmd Boolcmds[] = {
"y", 1, /* Synonyms for "true" */
"yes", 1,
"true", 1,
"on", 1,
"1", 1,
"set", 1,
"enable", 1,
"n", 0, /* Synonyms for "false" */
"no", 0,
"false", 0,
"off", 0,
"0", 0,
"clear", 0,
"disable", 0,
NULLCHAR
};
static int print_help __ARGS((struct cmds *cmdp));
static char *stringparse __ARGS((char *line));
static char *
stringparse(line)
char *line;
{
register char *cp = line;
unsigned long num;
while ( *line != '\0' && *line != '\"' ) {
if ( *line == '\\' ) {
line++;
switch ( *line++ ) {
case 'n':
*cp++ = '\n';
break;
case 't':
*cp++ = '\t';
break;
case 'v':
*cp++ = '\v';
break;
case 'b':
*cp++ = '\b';
break;
case 'r':
*cp++ = '\r';
break;
case 'f':
*cp++ = '\f';
break;
#if defined(__STDC__)
case 'a':
*cp++ = '\a';
break;
#endif
case '\\':
*cp++ = '\\';
break;
#if defined(__STDC__)
case '\?':
*cp++ = '\?';
break;
#endif
case '\'':
*cp++ = '\'';
break;
case '\"':
*cp++ = '\"';
break;
case 'x':
num = strtoul( --line, &line, 16 );
*cp++ = (char) num;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
num = strtoul( --line, &line, 8 );
*cp++ = (char) num;
break;
case '\0':
return NULLCHAR;
default:
*cp++ = *(line - 1);
break;
};
} else {
*cp++ = *line++;
}
}
if ( *line == '\"' )
line++; /* skip final quote */
*cp = '\0'; /* terminate string */
return line;
}
int
cmdparse(cmds,line,p)
struct cmds cmds[];
register char *line;
void *p;
{
struct cmds *cmdp;
char *argv[NARG];
int argc;
/* Remove cr/lf */
rip(line);
for(argc = 0;argc < NARG;argc++)
argv[argc] = NULLCHAR;
for(argc = 0;argc < NARG;){
register int qflag = FALSE;
/* Skip leading white space */
while(isspace(uchar(*line)))
line++;
if(*line == '\0')
break;
/* '#' is start of comment */
if(*line == '#')
break;
/* Check for quoted token */
if(*line == '"'){
line++; /* Suppress quote */
qflag = TRUE;
}
argv[argc++] = line; /* Beginning of token */
if(qflag){
/* Find terminating delimiter */
if((line = stringparse(line)) == NULLCHAR){
return -1;
}
} else {
/* Find space or tab. If not present,
* then we've already found the last
* token.
*/
while(*line && !isspace(uchar(*line)))
line++;
}
if(*line)
*line++ = '\0';
}
if (argc < 1) { /* empty command line */
argc = 1;
argv[0] = "";
}
if (argv[0][0] == '?') return print_help(cmds);
/* Look up command in table; prefix matches are OK */
for(cmdp = cmds;cmdp->name != NULLCHAR;cmdp++){
if(strncmp(argv[0],cmdp->name,strlen(argv[0])) == 0)
break;
}
if(cmdp->name == NULLCHAR) {
if(cmdp->argc_errmsg != NULLCHAR)
printf("%s\n",cmdp->argc_errmsg);
return -1;
} else {
argv[0] = cmdp->name;
if(argc < cmdp->argcmin) {
/* Insufficient arguments */
printf("Usage: %s\n",cmdp->argc_errmsg);
return -1;
} else {
return (*cmdp->func)(argc,argv,p);
}
}
}
/* Call a subcommand based on the first token in an already-parsed line */
int
subcmd(tab,argc,argv,p)
struct cmds tab[];
int argc;
char *argv[];
void *p;
{
register struct cmds *cmdp;
int found = 0;
/* Strip off first token and pass rest of line to subcommand */
if (argc < 2) {
if (argc < 1)
printf("SUBCMD - Don't know what to do?\n");
else {
printf("\"%s\" subcommands:\n", argv[0]);
print_help(tab);
}
return -1;
}
argc--;
argv++;
for(cmdp = tab;cmdp->name != NULLCHAR;cmdp++){
if(strncmp(argv[0],cmdp->name,strlen(argv[0])) == 0){
found = 1;
break;
}
}
if(!found){
printf("\"%s\" subcommands:\n", argv[-1]);
print_help(tab);
return -1;
}
argv[0] = cmdp->name;
if(argc < cmdp->argcmin){
if(cmdp->argc_errmsg != NULLCHAR)
printf("Usage: %s\n",cmdp->argc_errmsg);
return -1;
}
return (*cmdp->func)(argc,argv,p);
}
static int print_help(cmdp)
register struct cmds *cmdp;
{
register int i;
for (i = 0; cmdp->name; cmdp++, i++)
printf((i % 5) < 4 ? "%-16s" : "%s\n", cmdp->name);
if (i % 5) putchar('\n');
putchar('\n');
return 0;
}
/* Subroutine for setting and displaying boolean flags */
int
setbool(var,label,argc,argv)
int *var;
char *label;
int argc;
char *argv[];
{
struct boolcmd *bc;
if(argc < 2){
printf("%s: %s\n",label,*var ? "on":"off");
return 0;
}
for(bc = Boolcmds;bc->str != NULLCHAR;bc++){
if(stricmp(argv[1],bc->str) == 0){
*var = bc->val;
return 0;
}
}
printf("Valid options:");
for(bc = Boolcmds;bc->str != NULLCHAR;bc++)
if(printf(" %s",bc->str) == EOF)
return 1;
printf("\n");
return 1;
}
/* Subroutine for setting and displaying bit values */
int
bit16cmd(bits,mask,label,argc,argv)
int16 *bits;
int16 mask;
char *label;
int argc;
char *argv[];
{
int doing = (*bits & mask);
int result = setbool( &doing, label, argc, argv );
if ( !result ) {
if ( doing )
*bits |= mask;
else
*bits &= ~mask;
}
return result;
}
/* Subroutine for setting and displaying long variables */
int
setlong(var,label,argc,argv)
int32 *var;
char *label;
int argc;
char *argv[];
{
if(argc < 2)
printf("%s: %ld\n",label,*var);
else
*var = atol(argv[1]);
return 0;
}
/* Subroutine for setting and displaying short variables */
int
setshort(var,label,argc,argv)
unsigned short *var;
char *label;
int argc;
char *argv[];
{
if(argc < 2)
printf("%s: %u\n",label,*var);
else
*var = atoi(argv[1]);
return 0;
}
/* Subroutine for setting and displaying integer variables */
int
setint(var,label,argc,argv)
int *var;
char *label;
int argc;
char *argv[];
{
if(argc < 2)
printf("%s: %i\n",label,*var);
else
*var = atoi(argv[1]);
return 0;
}
/* Subroutine for setting and displaying unsigned integer variables */
int
setuns(var,label,argc,argv)
unsigned *var;
char *label;
int argc;
char *argv[];
{
if(argc < 2)
printf("%s: %u\n",label,*var);
else
*var = atoi(argv[1]);
return 0;
}
/* Subroutine for setting and displaying int variables (with range check) */
int setintrc(var, label, argc, argv, minval, maxval)
int *var;
char *label;
int argc;
char *argv[];
int minval;
int maxval;
{
if (argc < 2)
printf("%s: %i\n", label, *var);
else {
int tmp = atoi(argv[1]);
if (tmp < minval || tmp > maxval) {
printf("%s must be %i..%i\n", label, minval, maxval);
return 1;
}
*var = tmp;
}
return 0;
}