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awk3.c
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1990-09-27
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/*
* awk3 -- Builtin functions and various utility procedures
*
* $Log: awk3.c,v $
* Revision 1.40 89/03/31 13:17:20 david
* GNU license; be careful about types in sprintf calls
*
* Revision 1.39 89/03/29 14:20:07 david
* delinting and code movement
* change redirect() to return struct redirect *
*
* Revision 1.38 89/03/22 22:10:20 david
* a cleaner way to handle assignment to $n where n > 0
*
* Revision 1.37 89/03/21 10:54:21 david
* cleanup and fix of handling of precision in format string of printf call
*
* Revision 1.36 89/03/15 22:01:51 david
* ENVIRON fix from hack
* relegated -Ft to strict compatibility
* getline error return fix
* printf %c fix (only print 1 char of a string)
* tolower & toupper added
* /dev/fd/N etc special files added
*
* Revision 1.35 89/03/15 21:34:05 david
* try to free more memory
*
* Revision 1.34 88/12/13 22:28:10 david
* temporarily #ifdef out flush_io in redirect(); adjust atan2() for
* force_number as a macro
*
* Revision 1.32 88/12/01 15:03:21 david
* renamed hack_print_node to do_print (at last!)
* moved force_string() up out of print_simple for simplicity
*
* Revision 1.31 88/11/30 15:17:27 david
* free previous value in set_fs
*
* Revision 1.30 88/11/29 16:24:47 david
* fix bug in previous change
*
* Revision 1.29 88/11/29 15:14:52 david
* dynamically manage open files/pipes to allow an arbitrary number of open files
* (i.e. when out of file descriptors, close the least recently used file,
* saving the current offset; if it is reused, reopen and seek to saved offset)
*
* Revision 1.28 88/11/28 20:12:53 david
* correct previous error in cleanup of do_substr
*
* Revision 1.27 88/11/23 21:42:13 david
* Arnold: change ENV to ENVIRON nad a further bug fix for -Ft
* ..
*
* Revision 1.26 88/11/22 13:50:33 david
* Arnold: added ENV array and bug fix to -Ft
*
* Revision 1.25 88/11/15 10:24:08 david
* Arnold: cleanup of comments, #include's and obsolete code
*
* Revision 1.24 88/11/14 21:57:03 david
* Arnold: init. FILENAME to "-" and cleanup in do_substr()
*
* Revision 1.23 88/11/01 12:17:45 david
* cleanu and code movement; changes to reflect change to parse_fields()
*
* Revision 1.22 88/10/19 21:58:43 david
* replace malloc and realloc with error checking versions
*
* Revision 1.21 88/10/17 20:55:31 david
* SYSV --> USG
*
* Revision 1.20 88/10/13 21:59:55 david
* purge FAST and cleanup error messages
*
* Revision 1.19 88/10/06 21:54:28 david
* cleaned up I/O handling
*
* Revision 1.18 88/10/06 15:49:01 david
* changes from Arnold: be careful about flushing I/O; warn about error on close;
* return seed from srand
*
* Revision 1.17 88/09/19 20:39:11 david
* minor cleanup
*
* Revision 1.16 88/08/09 14:55:16 david
* getline now gets next file properly
* stupid bug in do_split() fixed
* substr() now works if second arg. is negative (truncated to 0)
*
* Revision 1.15 88/06/13 18:07:12 david
* delete -R option
* cleanup of redirection code [from Arnold]
*
* Revision 1.14 88/06/07 23:41:00 david
* some paranoid typecasting plus one bug fix:
* in do_getline(), use stdin if input_file is NULL and ther is no redirection
*
* Revision 1.13 88/06/06 21:40:49 david
* oops! got a little overenthusiastic on that last merge
*
* Revision 1.12 88/06/06 11:27:57 david
* get rid of some obsolete code
* merge parsing of fields for record input and split()
*
* Revision 1.11 88/06/05 21:00:35 david
* flush I/O buffers before calling system (fix from Arnold)
*
* Revision 1.10 88/06/05 20:59:26 david
* local vars. now come off a stack
*
* Revision 1.9 88/06/01 22:08:24 david
* in split(), ensure that if second arg. is a local var. that the value is
* looked up
*
* Revision 1.8 88/05/31 09:30:16 david
* Arnold's portability fixes to last change in random() stuff
*
* Revision 1.7 88/05/30 09:53:49 david
* clean up some fatal() calls
* de-lint the random number code
*
* Revision 1.6 88/05/27 11:06:21 david
* input_file wasn't getting properly reset after getline
*
* Revision 1.5 88/05/26 22:49:55 david
* fixed error message for redirection
*
* Revision 1.4 88/05/18 18:20:02 david
* fixed case where RS==""; record was including a trailing newline
*
* Revision 1.3 88/04/13 17:39:26 david
* fixed bug in handling of NR and FNR
*
* Revision 1.2 88/04/12 16:04:02 david
* fixed bug: NF at end of record generated one less field than it should have
*
* Revision 1.1 88/04/08 15:15:07 david
* Initial revision
* Revision 1.7 88/04/08 15:08:48 david bug fix for file
* descriptor handlin
*
* Revision 1.6 88/04/08 14:48:36 david changes from Arnold Robbins
*
* Revision 1.5 88/03/28 14:13:54 david *** empty log message ***
*
* Revision 1.4 88/03/23 22:17:41 david mostly delinting -- a couple of bug
* fixes
*
* Revision 1.3 88/03/18 21:00:13 david Baseline -- hoefully all the
* functionality of the new awk added. Just debugging and tuning to do.
*
* Revision 1.2 87/11/19 14:42:31 david expanded functionality for getline
* broke out get_a_record() from inrec() so that the former can be used from
* do_getline add system() builtin and skeletons for many other new builtins
*
* Revision 1.1 87/10/27 15:23:33 david Initial revision
*
*/
/*
* Copyright (C) 1986, 1988, 1989 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Progamming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GAWK; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "awk.h"
extern int parse_fields();
extern void assoc_clear();
extern NODE *node();
#ifdef USG
extern long lrand48();
extern void srand48();
#else
extern void srandom();
extern char *initstate();
extern char *setstate();
extern long random();
#endif
static void set_element();
static void get_one();
static void get_two();
static int get_three();
static int a_get_three();
static void close_one();
static int close_fp();
static NODE *spc_var();
NODE *do_sprintf();
/* These nodes store all the special variables AWK uses */
NODE *FS_node, *NF_node, *RS_node, *NR_node;
NODE *FILENAME_node, *OFS_node, *ORS_node, *OFMT_node;
NODE *FNR_node, *RLENGTH_node, *RSTART_node, *SUBSEP_node;
NODE *ENVIRON_node, *IGNORECASE_node;
NODE *ARGC_node, *ARGV_node;
/*
* Set all the special variables to their initial values.
*/
void
init_vars()
{
/*** APPEND AFTER 221 IN x:awk3.c ***/
#ifdef AMIGA
char **environ = NULL;
#else
/*** APPEND AFTER 221 IN x:awk3.c ***/
extern char **environ;
/*** APPEND AFTER 222 IN x:awk3.c ***/
#endif
/*** APPEND AFTER 222 IN x:awk3.c ***/
char *var, *val;
NODE **aptr;
int i;
FS_node = spc_var("FS", make_string(" ", 1));
NF_node = spc_var("NF", make_number(-1.0));
RS_node = spc_var("RS", make_string("\n", 1));
NR_node = spc_var("NR", make_number(0.0));
FNR_node = spc_var("FNR", make_number(0.0));
FILENAME_node = spc_var("FILENAME", make_string("-", 1));
OFS_node = spc_var("OFS", make_string(" ", 1));
ORS_node = spc_var("ORS", make_string("\n", 1));
OFMT_node = spc_var("OFMT", make_string("%.6g", 4));
RLENGTH_node = spc_var("RLENGTH", make_number(0.0));
RSTART_node = spc_var("RSTART", make_number(0.0));
SUBSEP_node = spc_var("SUBSEP", make_string("\034", 1));
IGNORECASE_node = spc_var("IGNORECASE", make_number(0.0));
ENVIRON_node = spc_var("ENVIRON", Nnull_string);
for (i = 0; environ[i]; i++) {
static char nullstr[] = "";
var = environ[i];
val = index(var, '=');
if (val)
*val++ = '\0';
else
val = nullstr;
aptr = assoc_lookup(ENVIRON_node, tmp_string(var, strlen (var)));
*aptr = make_string(val, strlen (val));
/* restore '=' so that system() gets a valid environment */
if (val != nullstr)
*--val = '=';
}
}
/*
* OFMT is special because we don't dare use force_string on it for fear of
* infinite loops. Thus, if it isn't a string, we return the default "%.6g"
* This may or may not be the right thing to do, but its the easiest
*/
/* This routine isn't used! It should be. */
#ifdef notdef
char *
get_ofmt()
{
register NODE *tmp;
tmp = OFMT_node->var_value;
if ((tmp->type != Node_string && tmp->type != Node_str_num) || tmp->stlen == 0)
return "%.6g";
return tmp->stptr;
}
#endif
char *
get_fs()
{
register NODE *tmp;
tmp = force_string(FS_node->var_value);
if (tmp->stlen == 0)
return 0;
return tmp->stptr;
}
void
set_fs(str)
char *str;
{
register NODE **tmp;
tmp = get_lhs(FS_node, 0);
/*
* Only if in full compatibility mode check for the stupid special
* case so -F\t works as documented in awk even though the shell
* hands us -Ft. Bleah!
*/
if (strict && str[0] == 't' && str[1] == '\0')
str[0] = '\t';
*tmp = make_string(str, 1);
do_deref();
}
/* Builtin functions */
NODE *
do_exp(tree)
NODE *tree;
{
NODE *tmp;
double exp();
get_one(tree, &tmp);
return tmp_number((AWKNUM)exp((double)force_number(tmp)));
}
NODE *
do_index(tree)
NODE *tree;
{
NODE *s1, *s2;
register char *p1, *p2;
register int l1, l2;
get_two(tree, &s1, &s2);
p1 = s1->stptr;
p2 = s2->stptr;
l1 = s1->stlen;
l2 = s2->stlen;
while (l1) {
if (STREQN(p1, p2, l2))
return tmp_number((AWKNUM) (1 + s1->stlen - l1));
l1--;
p1++;
}
return tmp_number((AWKNUM) 0.0);
}
NODE *
do_int(tree)
NODE *tree;
{
NODE *tmp;
double floor();
get_one(tree, &tmp);
return tmp_number((AWKNUM)floor((double)force_number(tmp)));
}
NODE *
do_length(tree)
NODE *tree;
{
NODE *tmp;
get_one(tree, &tmp);
return tmp_number((AWKNUM) (force_string(tmp)->stlen));
}
NODE *
do_log(tree)
NODE *tree;
{
NODE *tmp;
double log();
get_one(tree, &tmp);
return tmp_number((AWKNUM)log((double)force_number(tmp)));
}
void
do_printf(tree)
NODE *tree;
{
register FILE *fp = stdout;
int errflg = 0; /* not used, sigh */
if (tree->rnode)
fp = redirect(tree->rnode, &errflg)->fp;
if (fp)
print_simple(do_sprintf(tree->lnode), fp);
}
static void
set_element(num, s, len, n)
int num;
char *s;
int len;
NODE *n;
{
*assoc_lookup(n, tmp_number((AWKNUM) (num))) = make_string(s, len);
}
NODE *
do_split(tree)
NODE *tree;
{
NODE *t1, *t2, *t3;
register char *splitc;
char *s;
NODE *n;
if (a_get_three(tree, &t1, &t2, &t3) < 3)
splitc = get_fs();
else
splitc = force_string(t3)->stptr;
n = t2;
if (t2->type == Node_param_list)
n = stack_ptr[t2->param_cnt];
if (n->type != Node_var && n->type != Node_var_array)
fatal("second argument of split is not a variable");
assoc_clear(n);
tree = force_string(t1);
s = tree->stptr;
return tmp_number((AWKNUM)
parse_fields(HUGE, &s, tree->stlen, splitc, set_element, n));
}
/*
* Note that the output buffer cannot be static because sprintf may get
* called recursively by force_string. Hence the wasteful alloca calls
*/
/* %e and %f formats are not properly implemented. Someone should fix them */
NODE *
do_sprintf(tree)
NODE *tree;
{
#define bchunk(s,l) if(l) {\
if((l)>ofre) {\
char *tmp;\
tmp=(char *)alloca(osiz*2);\
bcopy(obuf,tmp,olen);\
obuf=tmp;\
ofre+=osiz;\
osiz*=2;\
}\
bcopy(s,obuf+olen,(l));\
olen+=(l);\
ofre-=(l);\
}
/* Is there space for something L big in the buffer? */
#define chksize(l) if((l)>ofre) {\
char *tmp;\
tmp=(char *)alloca(osiz*2);\
bcopy(obuf,tmp,olen);\
obuf=tmp;\
ofre+=osiz;\
osiz*=2;\
}
/*
* Get the next arg to be formatted. If we've run out of args,
* return "" (Null string)
*/
#define parse_next_arg() {\
if(!carg) arg= Nnull_string;\
else {\
get_one(carg,&arg);\
carg=carg->rnode;\
}\
}
char *obuf;
int osiz, ofre, olen;
static char chbuf[] = "0123456789abcdef";
static char sp[] = " ";
char *s0, *s1;
int n0;
NODE *sfmt, *arg;
register NODE *carg;
long fw, prec, lj, alt, big;
long *cur;
long val;
unsigned long uval;
int sgn;
int base;
char cpbuf[30]; /* if we have numbers bigger than 30 */
char *cend = &cpbuf[30];/* chars, we lose, but seems unlikely */
char *cp;
char *fill;
double tmpval;
char *pr_str;
extern char *gcvt();
obuf = (char *) alloca(120);
osiz = 120;
ofre = osiz;
olen = 0;
get_one(tree, &sfmt);
sfmt = force_string(sfmt);
carg = tree->rnode;
for (s0 = s1 = sfmt->stptr, n0 = sfmt->stlen; n0-- > 0;) {
if (*s1 != '%') {
s1++;
continue;
}
bchunk(s0, s1 - s0);
s0 = s1;
cur = &fw;
fw = 0;
prec = 0;
lj = alt = big = 0;
fill = sp;
cp = cend;
s1++;
retry:
--n0;
switch (*s1++) {
case '%':
bchunk("%", 1);
s0 = s1;
break;
case '0':
if (fill != sp || lj)
goto lose;
if (cur == &fw)
fill = "0"; /* FALL through */
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (cur == 0)
goto lose;
*cur = s1[-1] - '0';
while (n0 > 0 && *s1 >= '0' && *s1 <= '9') {
--n0;
*cur = *cur * 10 + *s1++ - '0';
}
goto retry;
case '-':
if (lj || fill != sp)
goto lose;
lj++;
goto retry;
case '.':
if (cur != &fw)
goto lose;
cur = ≺
goto retry;
case '#':
if (alt)
goto lose;
alt++;
goto retry;
case 'l':
if (big)
goto lose;
big++;
goto retry;
case 'c':
parse_next_arg();
if (arg->flags & NUM) {
uval = (unsigned long) arg->numbr;
cpbuf[0] = uval;
prec = 1;
pr_str = cpbuf;
goto dopr_string;
}
if (! prec)
prec = 1;
else if (prec > arg->stlen)
prec = arg->stlen;
pr_str = cpbuf;
goto dopr_string;
case 's':
parse_next_arg();
arg = force_string(arg);
if (!prec || prec > arg->stlen)
prec = arg->stlen;
pr_str = arg->stptr;
dopr_string:
if (fw > prec && !lj) {
while (fw > prec) {
bchunk(sp, 1);
fw--;
}
}
bchunk(pr_str, (int) prec);
if (fw > prec) {
while (fw > prec) {
bchunk(sp, 1);
fw--;
}
}
s0 = s1;
break;
case 'd':
parse_next_arg();
val = (long) force_number(arg);
if (val < 0) {
sgn = 1;
val = -val;
} else
sgn = 0;
do {
*--cp = '0' + val % 10;
val /= 10;
} while (val);
if (sgn)
*--cp = '-';
prec = cend - cp;
if (fw > prec && !lj) {
if (fill != sp && *cp == '-') {
bchunk(cp, 1);
cp++;
prec--;
fw--;
}
while (fw > prec) {
bchunk(fill, 1);
fw--;
}
}
bchunk(cp, (int) prec);
if (fw > prec) {
while (fw > prec) {
bchunk(fill, 1);
fw--;
}
}
s0 = s1;
break;
case 'u':
base = 10;
goto pr_unsigned;
case 'o':
base = 8;
goto pr_unsigned;
case 'x':
base = 16;
goto pr_unsigned;
pr_unsigned:
parse_next_arg();
uval = (unsigned long) force_number(arg);
do {
*--cp = chbuf[uval % base];
uval /= base;
} while (uval);
prec = cend - cp;
if (fw > prec && !lj) {
while (fw > prec) {
bchunk(fill, 1);
fw--;
}
}
bchunk(cp, (int) prec);
if (fw > prec) {
while (fw > prec) {
bchunk(fill, 1);
fw--;
}
}
s0 = s1;
break;
case 'g':
parse_next_arg();
tmpval = force_number(arg);
if (prec == 0)
prec = 13;
(void) gcvt(tmpval, (int) prec, cpbuf);
prec = strlen(cpbuf);
cp = cpbuf;
if (fw > prec && !lj) {
if (fill != sp && *cp == '-') {
bchunk(cp, 1);
cp++;
prec--;
} /* Deal with .5 as 0.5 */
if (fill == sp && *cp == '.') {
--fw;
while (--fw >= prec) {
bchunk(fill, 1);
}
bchunk("0", 1);
} else
while (fw-- > prec)
bchunk(fill, 1);
} else {/* Turn .5 into 0.5 */
/* FOO */
if (*cp == '.' && fill == sp) {
bchunk("0", 1);
--fw;
}
}
bchunk(cp, (int) prec);
if (fw > prec)
while (fw-- > prec)
bchunk(fill, 1);
s0 = s1;
break;
case 'f':
parse_next_arg();
tmpval = force_number(arg);
chksize(fw + prec + 5); /* 5==slop */
cp = cpbuf;
*cp++ = '%';
if (lj)
*cp++ = '-';
if (fill != sp)
*cp++ = '0';
if (cur != &fw) {
(void) strcpy(cp, "*.*f");
(void) sprintf(obuf + olen, cpbuf, (int) fw, (int) prec, (double) tmpval);
} else {
(void) strcpy(cp, "*f");
(void) sprintf(obuf + olen, cpbuf, (int) fw, (double) tmpval);
}
cp = obuf + olen;
ofre -= strlen(obuf + olen);
olen += strlen(obuf + olen); /* There may be nulls */
s0 = s1;
break;
case 'e':
parse_next_arg();
tmpval = force_number(arg);
chksize(fw + prec + 5); /* 5==slop */
cp = cpbuf;
*cp++ = '%';
if (lj)
*cp++ = '-';
if (fill != sp)
*cp++ = '0';
if (cur != &fw) {
(void) strcpy(cp, "*.*e");
(void) sprintf(obuf + olen, cpbuf, (int) fw, (int) prec, (double) tmpval);
} else {
(void) strcpy(cp, "*e");
(void) sprintf(obuf + olen, cpbuf, (int) fw, (double) tmpval);
}
cp = obuf + olen;
ofre -= strlen(obuf + olen);
olen += strlen(obuf + olen); /* There may be nulls */
s0 = s1;
break;
default:
lose:
break;
}
}
bchunk(s0, s1 - s0);
return tmp_string(obuf, olen);
}
NODE *
do_sqrt(tree)
NODE *tree;
{
NODE *tmp;
double sqrt();
get_one(tree, &tmp);
return tmp_number((AWKNUM)sqrt((double)force_number(tmp)));
}
NODE *
do_substr(tree)
NODE *tree;
{
NODE *t1, *t2, *t3;
register int indx, length;
length = -1;
if (get_three(tree, &t1, &t2, &t3) == 3)
length = (int) force_number(t3);
indx = (int) force_number(t2) - 1;
tree = force_string(t1);
if (length == -1)
length = tree->stlen;
if (indx < 0)
indx = 0;
if (indx >= tree->stlen || length <= 0)
return Nnull_string;
if (indx + length > tree->stlen)
length = tree->stlen - indx;
return tmp_string(tree->stptr + indx, length);
}
NODE *
do_system(tree)
NODE *tree;
{
NODE *tmp;
int ret;
(void) flush_io (); /* so output is syncrhonous with gawk's */
get_one(tree, &tmp);
ret = system(force_string(tmp)->stptr);
ret = (ret >> 8) & 0xff;
return tmp_number((AWKNUM) ret);
}
void
do_print(tree)
register NODE *tree;
{
register FILE *fp = stdout;
int errflg = 0; /* not used, sigh */
if (tree->rnode)
fp = redirect(tree->rnode, &errflg)->fp;
if (!fp)
return;
tree = tree->lnode;
if (!tree)
tree = WHOLELINE;
if (tree->type != Node_expression_list) {
if (!(tree->flags & STR))
cant_happen();
print_simple(tree, fp);
} else {
while (tree) {
print_simple(force_string(tree_eval(tree->lnode)), fp);
tree = tree->rnode;
if (tree)
print_simple(OFS_node->var_value, fp);
}
}
print_simple(ORS_node->var_value, fp);
}
NODE *
do_tolower(tree)
NODE *tree;
{
NODE *t1, *t2;
register char *cp, *cp2;
get_one(tree, &t1);
t1 = force_string(t1);
t2 = tmp_string(t1->stptr, t1->stlen);
for (cp = t2->stptr, cp2 = t2->stptr + t2->stlen; cp < cp2; cp++)
if (isupper(*cp))
*cp = tolower(*cp);
return t2;
}
NODE *
do_toupper(tree)
NODE *tree;
{
NODE *t1, *t2;
register char *cp;
get_one(tree, &t1);
t1 = force_string(t1);
t2 = tmp_string(t1->stptr, t1->stlen);
for (cp = t2->stptr; cp < t2->stptr + t2->stlen; cp++)
if (islower(*cp))
*cp = toupper(*cp);
return t2;
}
/*
* Get the arguments to functions. No function cares if you give it too many
* args (they're ignored). Only a few fuctions complain about being given
* too few args. The rest have defaults.
*/
static void
get_one(tree, res)
NODE *tree, **res;
{
if (!tree) {
*res = WHOLELINE;
return;
}
*res = tree_eval(tree->lnode);
}
static void
get_two(tree, res1, res2)
NODE *tree, **res1, **res2;
{
if (!tree) {
*res1 = WHOLELINE;
return;
}
*res1 = tree_eval(tree->lnode);
if (!tree->rnode)
return;
tree = tree->rnode;
*res2 = tree_eval(tree->lnode);
}
static int
get_three(tree, res1, res2, res3)
NODE *tree, **res1, **res2, **res3;
{
if (!tree) {
*res1 = WHOLELINE;
return 0;
}
*res1 = tree_eval(tree->lnode);
if (!tree->rnode)
return 1;
tree = tree->rnode;
*res2 = tree_eval(tree->lnode);
if (!tree->rnode)
return 2;
tree = tree->rnode;
*res3 = tree_eval(tree->lnode);
return 3;
}
static int
a_get_three(tree, res1, res2, res3)
NODE *tree, **res1, **res2, **res3;
{
if (!tree) {
*res1 = WHOLELINE;
return 0;
}
*res1 = tree_eval(tree->lnode);
if (!tree->rnode)
return 1;
tree = tree->rnode;
*res2 = tree->lnode;
if (!tree->rnode)
return 2;
tree = tree->rnode;
*res3 = tree_eval(tree->lnode);
return 3;
}
void
print_simple(tree, fp)
NODE *tree;
FILE *fp;
{
if (fwrite(tree->stptr, sizeof(char), tree->stlen, fp) != tree->stlen)
warning("fwrite: %s", sys_errlist[errno]);
free_temp(tree);
}
NODE *
do_atan2(tree)
NODE *tree;
{
NODE *t1, *t2;
extern double atan2();
get_two(tree, &t1, &t2);
(void) force_number(t1);
return tmp_number((AWKNUM) atan2((double) t1->numbr,
(double) force_number(t2)));
}
NODE *
do_sin(tree)
NODE *tree;
{
NODE *tmp;
extern double sin();
get_one(tree, &tmp);
return tmp_number((AWKNUM) sin((double)force_number(tmp)));
}
NODE *
do_cos(tree)
NODE *tree;
{
NODE *tmp;
extern double cos();
get_one(tree, &tmp);
return tmp_number((AWKNUM) cos((double)force_number(tmp)));
}
static int firstrand = 1;
#ifndef USG
static char state[256];
#endif
#define MAXLONG 2147483647 /* maximum value for long int */
/* ARGSUSED */
NODE *
do_rand(tree)
NODE *tree;
{
#ifdef USG
return tmp_number((AWKNUM) lrand48() / MAXLONG);
#else
if (firstrand) {
(void) initstate((unsigned) 1, state, sizeof state);
srandom(1);
firstrand = 0;
}
return tmp_number((AWKNUM) random() / MAXLONG);
#endif
}
NODE *
do_srand(tree)
NODE *tree;
{
NODE *tmp;
static long save_seed = 1;
long ret = save_seed; /* SVR4 awk srand returns previous seed */
extern long time();
#ifdef USG
if (tree == NULL)
srand48(save_seed = time((long *) 0));
else {
get_one(tree, &tmp);
srand48(save_seed = (long) force_number(tmp));
}
#else
if (firstrand)
(void) initstate((unsigned) 1, state, sizeof state);
else
(void) setstate(state);
if (!tree)
srandom((int) (save_seed = time((long *) 0)));
else {
get_one(tree, &tmp);
srandom((int) (save_seed = (long) force_number(tmp)));
}
#endif
firstrand = 0;
return tmp_number((AWKNUM) ret);
}
/* Create a special variable */
static NODE *
spc_var(name, value)
char *name;
NODE *value;
{
register NODE *r;
if ((r = lookup(variables, name)) == NULL)
r = install(variables, name, node(value, Node_var, (NODE *) NULL));
return r;
}
void
init_args(argc0, argc, argv0, argv)
int argc0, argc;
char *argv0;
char **argv;
{
int i, j;
NODE **aptr;
ARGV_node = spc_var("ARGV", Nnull_string);
aptr = assoc_lookup(ARGV_node, tmp_number(0.0));
*aptr = make_string(argv0, strlen(argv0));
for (i = argc0, j = 1; i < argc; i++) {
aptr = assoc_lookup(ARGV_node, tmp_number((AWKNUM) j));
*aptr = make_string(argv[i], strlen(argv[i]));
j++;
}
ARGC_node = spc_var("ARGC", make_number((AWKNUM) j));
}