minix/commands/awk/n.c
2005-04-21 14:53:53 +00:00

149 lines
2.6 KiB
C
Executable file

/*
* a small awk clone
*
* (C) 1989 Saeko Hirabauashi & Kouichi Hirabayashi
*
* Absolutely no warranty. Use this software with your own risk.
*
* Permission to use, copy, modify and distribute this software for any
* purpose and without fee is hereby granted, provided that the above
* copyright and disclaimer notice.
*
* This program was written to fit into 64K+64K memory of the Minix 1.2.
*/
#include <stdio.h>
#include "awk.h"
NODE *
node0(type)
{
NODE *p;
char *emalloc();
p = (NODE *) emalloc(sizeof(*p) - sizeof(p));
p->n_type = type;
p->n_next = NULL;
return p;
}
NODE *
node1(type, arg0) NODE *arg0;
{
NODE *p;
char *emalloc();
p = (NODE *) emalloc(sizeof(*p));
p->n_type = type;
p->n_next = NULL;
p->n_arg[0] = (NODE *) arg0;
return p;
}
NODE *
node2(type, arg0, arg1) NODE *arg0, *arg1;
{
NODE *p;
char *emalloc();
p = (NODE *) emalloc(sizeof(*p) + sizeof(p) * 1);
p->n_type = type;
p->n_next = NULL;
p->n_arg[0] = (NODE *) arg0;
p->n_arg[1] = (NODE *) arg1;
return p;
}
NODE *
node3(type, arg0, arg1, arg2) NODE *arg0, *arg1, *arg2;
{
NODE *p;
char *emalloc();
p = (NODE *) emalloc(sizeof(*p) + sizeof(p) * 2);
p->n_type = type;
p->n_next = NULL;
p->n_arg[0] = (NODE *) arg0;
p->n_arg[1] = (NODE *) arg1;
p->n_arg[2] = (NODE *) arg2;
return p;
}
NODE *
node4(type, arg0, arg1, arg2, arg3) NODE *arg0, *arg1, *arg2, *arg3;
{
NODE *p;
char *emalloc();
p = (NODE *) emalloc(sizeof(*p) + sizeof(p) * 3);
p->n_type = type;
p->n_next = NULL;
p->n_arg[0] = (NODE *) arg0;
p->n_arg[1] = (NODE *) arg1;
p->n_arg[2] = (NODE *) arg2;
p->n_arg[3] = (NODE *) arg3;
return p;
}
CELL *
mkcell(type, sval, fval) char *sval; double fval;
{
CELL *p;
char *emalloc(), *strsave();
p = (CELL *) emalloc(sizeof(*p));
p->c_type = type;
if (sval == NULL)
p->c_sval = NULL;
else
p->c_sval = strsave(sval);
p->c_fval = fval;
return p;
}
#ifdef TMPCELL
#define MAXTMP 25
CELL tmpcell[MAXTMP];
#endif
CELL *
mktmp(type, sval, fval) char *sval; double fval;
{
register int i;
char *strsave();
#ifdef TMPCELL
for (i = 0; i < MAXTMP; i++)
if (tmpcell[i].c_type == 0) {
tmpcell[i].c_type = type | TMP;
tmpcell[i].c_sval = strsave(sval);
tmpcell[i].c_fval = fval;
return &tmpcell[i];
}
error("formula too complex", (char *) 0);
#else
return mkcell(type | TMP, sval, fval);
#endif
}
c_free(p) CELL *p;
{
if ((p != NULL) && (p->c_type & TMP)) {
#ifdef TMPCELL
p->c_type = 0;
sfree(p->c_sval);
p->c_sval = (char *)NULL;
p->c_fval = 0.0;
#else
if (p->c_sval != NULL) {
Free(p->c_sval);
p->c_sval = NULL;
}
p->c_type = 0;
Free(p);
p = NULL;
#endif
}
}