minix/commands/awk/v.c

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2005-04-21 16:53:53 +02:00
/*
* 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 <ctype.h>
#include "awk.h"
#include "regexp.h"
#define PI 3.14159265358979323846
#define HASHSIZE 50
#define MAXFIELD 100
double atof();
char *getsval(), *jStrchar();
extern CELL *execute(), *_Arg();
extern char record[];
extern CELL *field[];
extern CELL truecell, falsecell;
extern prmflg;
SYMBOL *hashtab[HASHSIZE];
SYMBOL *funtab[HASHSIZE];
SYMBOL *argtab[HASHSIZE];
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SYMBOL *envtab[HASHSIZE];
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char *strsave(), *emalloc(), *strchr();
CELL *lookup(), *install(), *_install(), *mkcell(), *mktmp(), *getvar();
char **FS, **RS, **OFS, **ORS, **OFMT, **FILENAME;
char **SUBSEP;
double *NR, *NF;
double *FNR, *ARGC, *RSTART, *RLENGTH;
init()
{
FS = &install("FS", VAR|STR, " ", 0.0, hashtab)->c_sval;
RS = &install("RS", VAR|STR, "\n", 0.0, hashtab)->c_sval;
OFS = &install("OFS", VAR|STR , " ", 0.0, hashtab)->c_sval;
ORS = &install("ORS", VAR|STR, "\n", 0.0, hashtab)->c_sval;
OFMT = &install("OFMT", VAR|STR, "%.6g", 0.0, hashtab)->c_sval;
NR = &install("NR", VAR|NUM, (char *)NULL, 0.0, hashtab)->c_fval;
NF = &install("NF", VAR|NUM, (char *)NULL, 0.0, hashtab)->c_fval;
FILENAME = &install("FILENAME", VAR|STR, (char *)NULL, 0.0, hashtab)->c_sval;
install("PI", VAR|NUM, (char *)NULL, PI, hashtab);
field[0] = mkcell(REC|STR, (char *)NULL, 0.0); /* $0 */
field[0]->c_sval = record;
SUBSEP = &install("SUBSEP", VAR|STR, "\034", 0.0, hashtab)->c_sval;
FNR = &install("FNR", VAR|NUM, (char *)NULL, 0.0, hashtab)->c_fval;
RSTART = &install("RSTART", VAR|NUM, (char *)NULL, 0.0, hashtab)->c_fval;
RLENGTH = &install("RLENGTH", VAR|NUM, (char *)NULL, 0.0, hashtab)->c_fval;
}
setvar(s) char *s;
{
CELL *u;
char *t;
for (t = s; *t && *t != '='; t++)
;
*t++ = '\0';
if ((u = lookup(s, hashtab)) == (CELL *)NULL) {
if (isnum(t))
install(s, VAR|NUM|STR, t, atof(t), hashtab);
else
install(s, VAR|STR, t, 0.0, hashtab);
}
else {
if (isnum(t))
setfval(u, atof(t));
else
setsval(u, t);
}
}
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initarg(arg0, argc, argv, envp) char *arg0, **argv, **envp;
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{
CELL *u;
register int i;
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register char str[4], *p;
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ARGC = &install("ARGC", VAR|NUM, (char *)NULL, (double)argc+1, hashtab)->c_fval;
u = install("ARGV", ARR, (char *)NULL, 0.0, hashtab);
u->c_sval = (char *) argtab;
install("0", VAR|STR, arg0, 0.0, argtab);
for (i = 0; i < argc; i++) {
sprintf(str, "%d", i+1);
if (isnum(argv[i]))
install(str, VAR|STR|NUM, argv[i], atof(argv[i]), argtab);
else
install(str, VAR|STR, argv[i], 0.0, argtab);
}
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u = install("ENVIRON", ARR, (char *)NULL, 0.0, hashtab);
u->c_sval = (char *) envtab;
for (i = 0; envp[i] && *envp[i]; i++) {
if ((p = strchr(envp[i], '=')) != NULL) {
*p = 0;
if (isnum(p+1))
install(envp[i], VAR|STR|NUM, p+1, atof(p+1), envtab);
else
install(envp[i], VAR|STR, p+1, 0.0, envtab);
*p = '=';
}
}
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}
static
hash(s) unsigned char *s;
{
register unsigned int h;
for (h = 0; *s; )
h += *s++;
return h % HASHSIZE;
}
CELL *
lookup(s, h) char *s; SYMBOL *h[];
{
register SYMBOL *p;
for (p = h[hash(s)]; p; p = p->s_next)
if (strcmp(s, p->s_name) == 0)
return p->s_val;
return (CELL *)NULL;
}
static CELL *
install(name, type, sval, fval, h) char *name, *sval; double fval; SYMBOL *h[];
{
CELL *u;
if ((u = lookup(name, h)) == (CELL *)NULL)
u = _install(name, type, sval, fval, h);
else
error("%s is doubly defined", name);
return u;
}
static CELL *
_install(name, type, sval, fval, h) char *name, *sval; double fval; SYMBOL *h[];{
register SYMBOL *p;
CELL *u;
int hval;
p = (SYMBOL *) emalloc(sizeof(*p));
u = (CELL *) emalloc(sizeof(*u));
p->s_name = strsave(name);
p->s_val = u;
hval = hash(name);
p->s_next = h[hval];
h[hval] = p;
u->c_type = type;
u->c_sval = strsave(sval);
#if 0
if (!(type & NUM) && isnum(sval)) {
u->c_fval = atof(sval);
u->c_type |= NUM;
}
else
#endif
u->c_fval = fval;
return u;
}
CELL *
getvar(s, h, typ) char *s; SYMBOL *h[];
{
CELL *u;
SYMBOL *p;
char *t;
int i, hval;
if ((u = lookup(s, h)) == (CELL *)NULL) {
if (prmflg) {
u = _install(s, UDF, "", 0.0, h);
goto rtn;
}
else if (typ & ARR) {
t = emalloc(sizeof(SYMBOL *) * HASHSIZE);
for (i = 0; i < HASHSIZE; i++)
((SYMBOL **) t)[i] = (SYMBOL *)NULL;
u = (CELL *) emalloc(sizeof(*u));
u->c_type = typ;
u->c_sval = t;
u->c_fval = 0.0;
p = (SYMBOL *) emalloc(sizeof(*p));
p->s_name = strsave(s);
p->s_val = u;
hval = hash(s);
p->s_next = h[hval];
h[hval] = p;
}
else
u = _install(s, typ, "", 0.0, h);
}
else if (!prmflg && (u->c_type == UDF) && (typ != UDF)) {
/* fix up local_var/forward_function */
if (typ == ARR) {
/*
printf("getvar_correct_to_array\n");
*/
u->c_type = typ;
sfree(u->c_sval);
u->c_sval = emalloc(sizeof(SYMBOL *) * HASHSIZE);
for (i = 0; i < HASHSIZE; i++)
((SYMBOL **) u->c_sval)[i] = (SYMBOL *)NULL;
u->c_fval = 0.0;
}
else if (typ != UDF) {
u->c_type = typ;
}
}
rtn:
return u;
}
fixarray(u) CELL *u;
{
int i;
if (u->c_type == UDF) { /* fix up local var */
/*
printf("fixarray\n");
*/
u->c_type = ARR;
sfree(u->c_sval);
u->c_sval = emalloc(sizeof(SYMBOL *) * HASHSIZE);
for (i = 0; i < HASHSIZE; i++)
((SYMBOL **) u->c_sval)[i] = (SYMBOL *)NULL;
u->c_fval = 0.0;
}
}
a_free(u) CELL *u;
{ /* free local array */
SYMBOL **h, *q, *r;
CELL *v;
int i;
if (!(u->c_type & ARR))
error("try to free non array variable", (char *)0);
h = (SYMBOL **) u->c_sval;
for (i = 0; i < HASHSIZE; i++)
for (q = h[i]; q; q = r) {
r = q->s_next;
sfree(q->s_name);
v = q->s_val; /* CELL */
c_free(v);
sfree(q); /* SYMBOL */
}
sfree(u->c_sval); /* symbol table */
c_free(u);
}
CELL *
Array(p) NODE *p;
{
CELL *u;
char str[BUFSIZ];
int i, n;
CELL *v;
u = (CELL *) p->n_arg[0];
if (u->c_type == POS) {
i = (int)u->c_fval;
/*
printf("**ARG_ARRAY(%d)*\n", i);
*/
u = _Arg(i);
if (u->c_type == UDF) { /* fix up local array */
/*
printf("local_var_to_array\n");
*/
fixarray(u);
}
}
else if (!(u->c_type & ARR))
error("non array refference");
arrayelm(p, str);
u = getvar(str, u->c_sval, VAR|NUM|STR); /* "rtsort in AWK book */
return u;
}
static
arrayelm(p, s) NODE *p; char *s;
{
CELL *u;
int i, n;
char *t;
/*
char *tt = s;
*/
n = (int) p->n_arg[1] + 2;
for (i = 2; i < n; i++) {
if (i > 2)
*s++ = **SUBSEP;
u = execute(p->n_arg[i]);
for (t = getsval(u); *t; )
*s++ = *t++;
c_free(u);
}
*s = '\0';
/*
printf("array_elm(%s)\n", tt);
*/
}
CELL *
Element(p) NODE *p;
{
char str[BUFSIZ];
arrayelm(p, str);
return mktmp(STR, str, 0.0);
}
CELL *
Delete(p) NODE *p;
{
CELL *u;
char str[BUFSIZ];
int i;
SYMBOL *q, *r, **h;
u = (CELL *) p->n_arg[0];
if (!(u->c_type & ARR))
error("can't delete non array variable");
arrayelm(p, str);
h = (SYMBOL **) u->c_sval;
for (r = (SYMBOL *)NULL, i = hash(str), q = h[i]; q; r = q, q = q->s_next)
if (strcmp(str, q->s_name) == 0)
break;
if (q) {
sfree(q->s_val->c_sval);
sfree(q->s_name);
if (r)
r->s_next = q->s_next;
if (q == h[i])
h[i] = (SYMBOL *)NULL;
}
return &truecell;
}
CELL *
In(p) NODE *p;
{
SYMBOL **h, *q;
CELL *u, *v;
char *s;
int i;
u = (CELL *) p->n_arg[1]; /* array */
if (!(u->c_type & ARR))
error("%s is not an array", u->c_sval);
h = (SYMBOL **) u->c_sval;
if (u->c_sval != (char *)NULL) {
v = execute(p->n_arg[0]); /* var */
s = getsval(v);
for (i = 0; i < HASHSIZE; i++)
for (q = h[i]; q; q = q->s_next) {
if (strcmp(s, q->s_name) == 0) {
c_free(v);
return &truecell;
}
}
c_free(v);
}
return &falsecell;
}
CELL *
Split(p) NODE *p;
{
CELL *u, *v, *w;
char *s, *t, *h, *name, *sep;
int i, n, skip;
char elm[8], str[BUFSIZ];
static char *s_str;
static regexp *s_pat;
regexp *mkpat();
extern int r_start, r_length;
n = (int) p->n_arg[1];
if (n > 1) {
u = execute(p->n_arg[2]);
s = getsval(u); /* str */
v = execute(p->n_arg[3]); /* array */
if (!(v->c_type & ARR)) {
/*
printf("Split fix_to_array(%d)\n", v->c_type);
*/
if (v->c_type == UDF) /* fix up local array */
fixarray(v);
else
error("split to non array variable", (char *)0);
}
h = v->c_sval;
c_free(v);
if (n > 2) {
v = execute(p->n_arg[4]);
sep = getsval(v);
}
else {
v = (CELL *)NULL;
sep = *FS;
}
if (strlen(sep) > 1) { /* reg_exp */
if (strcmp(sep, s_str) != 0) {
sfree(s_str); sfree(s_pat);
s_str = strsave(sep);
s_pat = mkpat(s_str);
}
for (i = 0, t = str; *s; ) {
if (match(s_pat, s)) {
for (n = r_start; --n > 0; )
*t++ = *s++;
}
else {
while(*s)
*t++ = *s++;
}
*t = '\0';
t = str;
sprintf(elm, "%d", ++i);
w = getvar(elm, h, VAR);
if (isnum(str))
setfval(w, atof(str));
else
setsval(w, str);
if (*s)
s += r_length;
}
}
else {
skip = *sep == ' ';
for (i = 0; t = str, *s; ) {
if (skip)
while (jStrchr(" \t\n", *s))
s++;
if (!(*s))
break;
while (*s && !jStrchr(sep, *s)) {
if (isKanji(*s))
*t++ = *s++;
*t++ = *s++;
}
*t = '\0';
sprintf(elm, "%d", ++i);
w = getvar(elm, h, VAR);
if (isnum(str))
setfval(w, atof(str));
else
setsval(w, str);
if (*s && !skip)
s++;
}
}
c_free(v); /* sep */
c_free(u); /* str may be CATed */
}
else
i = 0;
return mktmp(NUM, (char *)NULL, (double) i);
}
CELL *
Forin(p) NODE *p;
{
CELL *u, *v;
SYMBOL **h, *q;
char *name;
int i;
u = execute(p->n_arg[1]);
if (!(u->c_type & ARR))
synerr(
"non array variable is specified in 'for (. in var)'", (char *)0);
h = (SYMBOL **) u->c_sval;
c_free(u);
u = execute(p->n_arg[0]);
if (u->c_type == UDF) {
/*
printf("Forin_fix_to_VAR|NUM\n");
*/
u->c_type = VAR|NUM;
}
if (!(u->c_type & VAR))
error("'for (VAR in .)' is not variable (%d)", name, u->c_type);
for (i = 0; i < HASHSIZE; i++) {
for (q = h[i]; q; q = q->s_next) {
setsval(u, q->s_name);
v = execute(p->n_arg[2]);
c_free(v);
}
}
c_free(u);
return &truecell;
}
char *
strsave(s) char *s;
{
register int n;
char *emalloc(), *strcpy();
if (s == (char *)NULL)
return (char *)NULL;
n = strlen(s) + 1;
return strcpy(emalloc(n), s);
}
sfree(p) char *p;
{
if (p != (char *)NULL)
Free(p);
}
isnum(s) char *s;
{
char *strchr();
if (s == NULL || *s == '\0' || !strcmp(s, "."))
return 0;
if (*s && strchr("+-", *s) != (char *)NULL)
s++;
if (*s == '\0')
return 0;
while (isdigit(*s))
s++;
if (*s == '.') {
s++;
while (isdigit(*s))
s++;
}
if (*s && strchr("eE", *s) != (char *)NULL) {
s++;
if (*s == '\0')
return 0;
if (*s && strchr("+-", *s) != (char *)NULL)
s++;
while (isdigit(*s))
s++;
}
return *s == '\0';
}
setfval(u, f) CELL *u; double f;
{
if (u->c_type == UDF) { /* fix up local var */
/*
printf("setfval_fix_to_VAR\n");
*/
u->c_type |= VAR;
}
if (u->c_type & (VAR|FLD|REC|TMP)) {
u->c_type &= ~STR;
u->c_type |= NUM;
sfree(u->c_sval);
u->c_sval = (char *)NULL;
u->c_fval = f;
if (u->c_type & FLD)
mkrec(u);
}
else
fprintf(stderr, "assign to nonvariable (%d)\n", u->c_type);
}
setsval(u, s) CELL *u; char *s;
{
double atof();
if (u->c_type == UDF) { /* fix up local var */
/*
printf("setsval_fix_to_VAR\n");
*/
u->c_type |= VAR;
}
if (u->c_type & (VAR|FLD|REC|TMP)) {
u->c_type &= ~NUM;
u->c_type |= STR;
sfree(u->c_sval);
u->c_sval = strsave(s);
#if 0 /* "table2" in AWK book */
if (isnum(u->c_sval)) {
u->c_fval = atof(u->c_sval);
u->c_type |= NUM;
}
else
#endif
u->c_fval = 0.0;
if (u->c_type & FLD)
mkrec(u);
}
else
fprintf(stderr, "assign to constant (%d)\n", u->c_type);
}
double
getfval(u) CELL *u;
{
double x, atof();
if (u->c_type == UDF) { /* local var */
u->c_type |= VAR|STR|NUM;
u->c_sval = strsave("");
x = u->c_fval = 0.0;
}
else if (u->c_type & NUM)
x = u->c_fval;
#if 1
else {
x = atof(u->c_sval);
#else
else {
if (isnum(u->c_sval))
x = atof(u->c_sval);
else
x = 0.0;
#endif
}
return x;
}
char *
getsval(u) CELL *u;
{
char *s, str[80];
if (u->c_type & STR)
s = u->c_sval;
else if (u->c_type & NUM) {
/* if (u->c_fval >= -2147483648.0 && u->c_fval <= 2147483647.0)*/
if ((long)u->c_fval == u->c_fval)
s = "%.16g";
else
s = *OFMT;
sprintf(str, s, u->c_fval);
sfree(u->c_sval);
s = u->c_sval = strsave(str);
}
#if 1
else if (u->c_type == UDF) { /* local var */
/*
printf("getsval_fix_to_VAR|STR\n");
*/
u->c_type |= VAR|STR|NUM;
s = u->c_sval = strsave("");
u->c_fval = 0.0;
}
#endif
else
fprintf(stderr, "abnormal value (STR|NUM == 0)(%d)\n", u->c_type);
return s;
}
char *
emalloc(n) unsigned n;
{
char *p;
#if 0
char far *_fmalloc();
#else
char *malloc();
#endif
#if 0
if ((p = _fmalloc(n)) == (char *)NULL)
#else
if ((p = malloc(n)) == (char *)NULL)
#endif
error("memory over");
return p;
}
Free(s) char *s;
{
#if DOS
void _ffree();
_ffree(s);
#else
free(s);
#endif
}