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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>
#include <geometry.h>
#include "dat.h"
#include "fns.h"
/*
* Generous estimate of number of fields, including terminal nil pointer
*/
static int
ncmdfield(char *p, int n)
{
int white, nwhite;
char *ep;
int nf;
if(p == nil)
return 1;
nf = 0;
ep = p+n;
white = 1; /* first text will start field */
while(p < ep){
nwhite = (strchr(" \t\r\n", *p++ & 0xFF) != 0); /* UTF is irrelevant */
if(white && !nwhite) /* beginning of field */
nf++;
white = nwhite;
}
return nf+1; /* +1 for nil */
}
/*
* parse a command written to a device
*/
Cmdbuf *
parsecmd(char *p, int n)
{
Cmdbuf *cb;
int nf;
char *sp;
nf = ncmdfield(p, n);
/* allocate Cmdbuf plus string pointers plus copy of string including \0 */
sp = emalloc(sizeof(*cb) + nf * sizeof(char*) + n + 1);
cb = (Cmdbuf*)sp;
cb->f = (char**)(&cb[1]);
cb->buf = (char*)(&cb->f[nf]);
memmove(cb->buf, p, n);
/* dump new line and null terminate */
if(n > 0 && cb->buf[n-1] == '\n')
n--;
cb->buf[n] = '\0';
cb->nf = tokenize(cb->buf, cb->f, nf-1);
cb->f[cb->nf] = nil;
return cb;
}
/*
* Look up entry in table
*/
Cmdtab *
lookupcmd(Cmdbuf *cb, Cmdtab *ctab, int nctab)
{
int i;
Cmdtab *ct;
if(cb->nf == 0){
werrstr("empty command");
return nil;
}
for(ct = ctab, i=0; i<nctab; i++, ct++){
if(strcmp(ct->cmd, cb->f[0]) != 0)
continue;
if(ct->narg != 0 && ct->narg != cb->nf){
// werrstr("wrong #args in command");
// return nil;
/* allow the same cmd name for different commands */
continue;
}
return ct;
}
werrstr("unknown command");
return nil;
}
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