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bi_funct.c
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/********************************************
bi_funct.c
copyright 2008-2012,2013, Thomas E. Dickey
copyright 1991-1995,1996, Michael D. Brennan
This is a source file for mawk, an implementation of
the AWK programming language.
Mawk is distributed without warranty under the terms of
the GNU General Public License, version 2, 1991.
********************************************/
/*
* $MawkId: bi_funct.c,v 1.67 2013/02/19 10:57:28 tom Exp $
* @Log: bi_funct.c,v @
* Revision 1.9 1996/01/14 17:16:11 mike
* flush_all_output() before system()
*
* Revision 1.8 1995/08/27 18:13:03 mike
* fix random number generator to work with longs larger than 32bits
*
* Revision 1.7 1995/06/09 22:53:30 mike
* change a memcmp() to strncmp() to make purify happy
*
* Revision 1.6 1994/12/13 00:26:32 mike
* rt_nr and rt_fnr for run-time error messages
*
* Revision 1.5 1994/12/11 22:14:11 mike
* remove THINK_C #defines. Not a political statement, just no indication
* that anyone ever used it.
*
* Revision 1.4 1994/12/10 21:44:12 mike
* fflush builtin
*
* Revision 1.3 1993/07/14 11:46:36 mike
* code cleanup
*
* Revision 1.2 1993/07/14 01:22:27 mike
* rm SIZE_T
*
* Revision 1.1.1.1 1993/07/03 18:58:08 mike
* move source to cvs
*
* Revision 5.5 1993/02/13 21:57:18 mike
* merge patch3
*
* Revision 5.4 1993/01/01 21:30:48 mike
* split new_STRING() into new_STRING and new_STRING0
*
* Revision 5.3.1.2 1993/01/27 01:04:06 mike
* minor tuning to str_str()
*
* Revision 5.3.1.1 1993/01/15 03:33:35 mike
* patch3: safer double to int conversion
*
* Revision 5.3 1992/12/17 02:48:01 mike
* 1.1.2d changes for DOS
*
* Revision 5.2 1992/07/08 15:43:41 brennan
* patch2: length returns. I am a wimp
*
* Revision 5.1 1991/12/05 07:55:35 brennan
* 1.1 pre-release
*/
#include <mawk.h>
#include <bi_funct.h>
#include <bi_vars.h>
#include <memory.h>
#include <init.h>
#include <files.h>
#include <fin.h>
#include <field.h>
#include <regexp.h>
#include <repl.h>
#include <ctype.h>
#include <math.h>
#include <time.h>
/* #define EXP_UNROLLED_GSUB */
#if OPT_TRACE > 0
#define return_CELL(func, cell) TRACE(("..." func " ->")); \
TRACE_CELL(cell); \
return cell
#else
#define return_CELL(func, cell) return cell
#endif
/* global for the disassembler */
/* *INDENT-OFF* */
BI_REC bi_funct[] =
{ /* info to load builtins */
{ "length", bi_length, 0, 1 }, /* special must come first */
{ "index", bi_index, 2, 2 },
{ "substr", bi_substr, 2, 3 },
{ "sprintf", bi_sprintf, 1, 255 },
{ "sin", bi_sin, 1, 1 },
{ "cos", bi_cos, 1, 1 },
{ "atan2", bi_atan2, 2, 2 },
{ "exp", bi_exp, 1, 1 },
{ "log", bi_log, 1, 1 },
{ "int", bi_int, 1, 1 },
{ "sqrt", bi_sqrt, 1, 1 },
{ "rand", bi_rand, 0, 0 },
{ "srand", bi_srand, 0, 1 },
{ "close", bi_close, 1, 1 },
{ "system", bi_system, 1, 1 },
{ "toupper", bi_toupper, 1, 1 },
{ "tolower", bi_tolower, 1, 1 },
{ "fflush", bi_fflush, 0, 1 },
/* useful gawk extension (time functions) */
{ "systime", bi_systime, 0, 0 },
#ifdef HAVE_MKTIME
{ "mktime", bi_mktime, 1, 1 },
#endif
#ifdef HAVE_STRFTIME
{ "strftime", bi_strftime, 0, 3 },
#endif
{ (char *) 0, (PF_CP) 0, 0, 0 }
};
/* *INDENT-ON* */
/* load built-in functions in symbol table */
void
bi_funct_init(void)
{
register BI_REC *p;
register SYMTAB *stp;
/* length is special (posix bozo) */
stp = insert(bi_funct->name);
stp->type = ST_LENGTH;
stp->stval.bip = bi_funct;
for (p = bi_funct + 1; p->name; p++) {
stp = insert(p->name);
stp->type = ST_BUILTIN;
stp->stval.bip = p;
}
#ifndef NO_INIT_SRAND
/* seed rand() off the clock */
{
CELL c;
c.type = C_NOINIT;
bi_srand(&c);
}
#endif
}
/**************************************************
string builtins (except split (in split.c) and [g]sub (at end))
**************************************************/
CELL *
bi_length(CELL * sp)
{
size_t len;
TRACE_FUNC("bi_length", sp);
if (sp->type == 0)
cellcpy(sp, field);
else
sp--;
if (sp->type < C_STRING)
cast1_to_s(sp);
len = string(sp)->len;
free_STRING(string(sp));
sp->type = C_DOUBLE;
sp->dval = (double) len;
return_CELL("bi_length", sp);
}
char *
str_str(char *target, size_t target_len, char *key, size_t key_len)
{
register int k = key[0];
int k1;
char *prior;
char *result = 0;
switch (key_len) {
case 0:
break;
case 1:
if (target_len != 0) {
result = memchr(target, k, target_len);
}
break;
case 2:
k1 = key[1];
prior = target;
while (target_len >= key_len && (target = memchr(target, k, target_len))) {
target_len = target_len - (size_t) (target - prior) - 1;
prior = ++target;
if (target[0] == k1) {
result = target - 1;
break;
}
}
break;
default:
key_len--;
prior = target;
while (target_len > key_len && (target = memchr(target, k, target_len))) {
target_len = target_len - (size_t) (target - prior) - 1;
prior = ++target;
if (memcmp(target, key + 1, key_len) == 0) {
result = target - 1;
break;
}
}
break;
}
return result;
}
CELL *
bi_index(CELL * sp)
{
size_t idx;
size_t len;
const char *p;
TRACE_FUNC("bi_index", sp);
sp--;
if (TEST2(sp) != TWO_STRINGS)
cast2_to_s(sp);
if ((len = string(sp + 1)->len)) {
idx = (size_t) ((p = str_str(string(sp)->str,
string(sp)->len,
string(sp + 1)->str,
len))
? p - string(sp)->str + 1
: 0);
} else { /* index of the empty string */
idx = 1;
}
free_STRING(string(sp));
free_STRING(string(sp + 1));
sp->type = C_DOUBLE;
sp->dval = (double) idx;
return_CELL("bi_index", sp);
}
/* substr(s, i, n)
if l = length(s) then get the characters
from max(1,i) to min(l,n-i-1) inclusive */
CELL *
bi_substr(CELL * sp)
{
int n_args, len;
register int i, n;
STRING *sval; /* substr(sval->str, i, n) */
TRACE_FUNC("bi_substr", sp);
n_args = sp->type;
sp -= n_args;
if (sp->type != C_STRING)
cast1_to_s(sp);
/* don't use < C_STRING shortcut */
sval = string(sp);
if ((len = (int) sval->len) == 0) /* substr on null string */
{
if (n_args == 3) {
cell_destroy(sp + 2);
}
cell_destroy(sp + 1);
return_CELL("bi_substr", sp);
}
if (n_args == 2) {
n = len;
if (sp[1].type != C_DOUBLE) {
cast1_to_d(sp + 1);
}
} else {
if (TEST2(sp + 1) != TWO_DOUBLES)
cast2_to_d(sp + 1);
n = d_to_i(sp[2].dval);
}
i = d_to_i(sp[1].dval) - 1; /* i now indexes into string */
/*
* If the starting index is past the end of the string, there is nothing
* to extract other than an empty string.
*/
if (i > len) {
n = 0;
}
/*
* Workaround in case someone's written a script that does substr(0,last-1)
* by transforming it into substr(1,last).
*/
if (i < 0) {
n -= i + 1;
i = 0;
}
/*
* Keep 'n' from extending past the end of the string.
*/
if (n > len - i) {
n = len - i;
}
if (n <= 0) /* the null string */
{
sp->ptr = (PTR) & null_str;
null_str.ref_cnt++;
} else { /* got something */
sp->ptr = (PTR) new_STRING0((size_t) n);
memcpy(string(sp)->str, sval->str + i, (size_t) n);
}
free_STRING(sval);
return_CELL("bi_substr", sp);
}
/*
match(s,r)
sp[0] holds r, sp[-1] holds s
*/
CELL *
bi_match(CELL * sp)
{
char *p;
size_t length;
TRACE_FUNC("bi_match", sp);
if (sp->type != C_RE)
cast_to_RE(sp);
if ((--sp)->type < C_STRING)
cast1_to_s(sp);
cell_destroy(RSTART);
cell_destroy(RLENGTH);
RSTART->type = C_DOUBLE;
RLENGTH->type = C_DOUBLE;
p = REmatch(string(sp)->str, string(sp)->len, cast_to_re((sp + 1)->ptr), &length);
if (p) {
sp->dval = (double) (p - string(sp)->str + 1);
RLENGTH->dval = (double) length;
} else {
sp->dval = 0.0;
RLENGTH->dval = -1.0; /* posix */
}
free_STRING(string(sp));
sp->type = C_DOUBLE;
RSTART->dval = sp->dval;
return_CELL("bi_match", sp);
}
CELL *
bi_toupper(CELL * sp)
{
STRING *old;
register char *p, *q;
TRACE_FUNC("bi_toupper", sp);
if (sp->type != C_STRING)
cast1_to_s(sp);
old = string(sp);
sp->ptr = (PTR) new_STRING0(old->len);
q = string(sp)->str;
p = old->str;
while (*p) {
*q = *p++;
*q = (char) toupper((UChar) * q);
q++;
}
free_STRING(old);
return_CELL("bi_toupper", sp);
}
CELL *
bi_tolower(CELL * sp)
{
STRING *old;
register char *p, *q;
TRACE_FUNC("bi_tolower", sp);
if (sp->type != C_STRING)
cast1_to_s(sp);
old = string(sp);
sp->ptr = (PTR) new_STRING0(old->len);
q = string(sp)->str;
p = old->str;
while (*p) {
*q = *p++;
*q = (char) tolower((UChar) * q);
q++;
}
free_STRING(old);
return_CELL("bi_tolower", sp);
}
/*
* Like gawk...
*/
CELL *
bi_systime(CELL * sp)
{
time_t result;
time(&result);
TRACE_FUNC("bi_systime", sp);
sp++;
sp->type = C_DOUBLE;
sp->dval = (double) result;
return_CELL("bi_systime", sp);
}
#ifdef HAVE_MKTIME
/* mktime(datespec)
Turns datespec into a time stamp of the same form as returned by systime().
The datespec is a string of the form
YYYY MM DD HH MM SS [DST].
*/
CELL *
bi_mktime(CELL * sp)
{
time_t result;
struct tm my_tm;
STRING *sval = string(sp);
int error = 0;
TRACE_FUNC("bi_mktime", sp);
memset(&my_tm, 0, sizeof(my_tm));
switch (sscanf(sval->str, "%d %d %d %d %d %d %d",
&my_tm.tm_year,
&my_tm.tm_mon,
&my_tm.tm_mday,
&my_tm.tm_hour,
&my_tm.tm_min,
&my_tm.tm_sec,
&my_tm.tm_isdst)) {
case 7:
break;
case 6:
my_tm.tm_isdst = -1; /* ask mktime to get timezone */
break;
default:
error = 1; /* not enough data */
break;
}
if (error) {
result = -1;
} else {
my_tm.tm_year -= 1900;
my_tm.tm_mon -= 1;
result = mktime(&my_tm);
}
TRACE(("...bi_mktime(%s) ->%s", sval->str, ctime(&result)));
cell_destroy(sp);
sp->type = C_DOUBLE;
sp->dval = (double) result;
return_CELL("bi_mktime", sp);
}
#endif
/* strftime(format, timestamp, utc)
should be equal to gawk strftime. all parameters are optional:
format: ansi c strftime format descriptor. default is "%c"
timestamp: seconds since unix epoch. default is now
utc: when set and != 0 date is utc otherwise local. default is 0
*/
#ifdef HAVE_STRFTIME
CELL *
bi_strftime(CELL * sp)
{
const char *format = "%c";
time_t rawtime;
struct tm *ptm;
int n_args;
int utc;
STRING *sval = 0; /* strftime(sval->str, timestamp, utc) */
char buff[128];
size_t result;
TRACE_FUNC("bi_strftime", sp);
n_args = sp->type;
sp -= n_args;
if (n_args > 0) {
if (sp->type != C_STRING)
cast1_to_s(sp);
/* don't use < C_STRING shortcut */
sval = string(sp);
if ((int) sval->len != 0) /* strftime on valid format */
format = sval->str;
} else {
sp->type = C_STRING;
}
if (n_args > 1) {
if (sp[1].type != C_DOUBLE)
cast1_to_d(sp + 1);
rawtime = d_to_i(sp[1].dval);
} else {
time(&rawtime);
}
if (n_args > 2) {
if (sp[2].type != C_DOUBLE)
cast1_to_d(sp + 2);
utc = d_to_i(sp[2].dval);
} else {
utc = 0;
}
if (utc != 0)
ptm = gmtime(&rawtime);
else
ptm = localtime(&rawtime);
result = strftime(buff, sizeof(buff) / sizeof(buff[0]), format, ptm);
TRACE(("...bi_strftime (%s, \"%d.%d.%d %d.%d.%d %d\", %d) ->%s\n",
format,
ptm->tm_year,
ptm->tm_mon,
ptm->tm_mday,
ptm->tm_hour,
ptm->tm_min,
ptm->tm_sec,
ptm->tm_isdst,
utc,
buff));
if (sval)
free_STRING(sval);
sp->ptr = (PTR) new_STRING1(buff, result);
while (n_args > 1) {
n_args--;
cell_destroy(sp + n_args);
}
return_CELL("bi_strftime", sp);
}
#endif /* HAVE_STRFTIME */
/************************************************
arithmetic builtins
************************************************/
#if STDC_MATHERR
static void
fplib_err(
char *fname,
double val,
char *error)
{
rt_error("%s(%g) : %s", fname, val, error);
}
#endif
CELL *
bi_sin(CELL * sp)
{
TRACE_FUNC("bi_sin", sp);
#if ! STDC_MATHERR
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
sp->dval = sin(sp->dval);
#else
{
double x;
errno = 0;
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
x = sp->dval;
sp->dval = sin(sp->dval);
if (errno)
fplib_err("sin", x, "loss of precision");
}
#endif
return_CELL("bi_sin", sp);
}
CELL *
bi_cos(CELL * sp)
{
TRACE_FUNC("bi_cos", sp);
#if ! STDC_MATHERR
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
sp->dval = cos(sp->dval);
#else
{
double x;
errno = 0;
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
x = sp->dval;
sp->dval = cos(sp->dval);
if (errno)
fplib_err("cos", x, "loss of precision");
}
#endif
return_CELL("bi_cos", sp);
}
CELL *
bi_atan2(CELL * sp)
{
TRACE_FUNC("bi_atan2", sp);
#if ! STDC_MATHERR
sp--;
if (TEST2(sp) != TWO_DOUBLES)
cast2_to_d(sp);
sp->dval = atan2(sp->dval, (sp + 1)->dval);
#else
{
errno = 0;
sp--;
if (TEST2(sp) != TWO_DOUBLES)
cast2_to_d(sp);
sp->dval = atan2(sp->dval, (sp + 1)->dval);
if (errno)
rt_error("atan2(0,0) : domain error");
}
#endif
return_CELL("bi_atan2", sp);
}
CELL *
bi_log(CELL * sp)
{
TRACE_FUNC("bi_log", sp);
#if ! STDC_MATHERR
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
sp->dval = log(sp->dval);
#else
{
double x;
errno = 0;
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
x = sp->dval;
sp->dval = log(sp->dval);
if (errno)
fplib_err("log", x, "domain error");
}
#endif
return_CELL("bi_log", sp);
}
CELL *
bi_exp(CELL * sp)
{
TRACE_FUNC("bi_exp", sp);
#if ! STDC_MATHERR
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
sp->dval = exp(sp->dval);
#else
{
double x;
errno = 0;
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
x = sp->dval;
sp->dval = exp(sp->dval);
if (errno && sp->dval)
fplib_err("exp", x, "overflow");
/* on underflow sp->dval==0, ignore */
}
#endif
return_CELL("bi_exp", sp);
}
CELL *
bi_int(CELL * sp)
{
TRACE_FUNC("bi_int", sp);
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
sp->dval = sp->dval >= 0.0 ? floor(sp->dval) : ceil(sp->dval);
return_CELL("bi_int", sp);
}
CELL *
bi_sqrt(CELL * sp)
{
TRACE_FUNC("bi_sqrt", sp);
#if ! STDC_MATHERR
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
sp->dval = sqrt(sp->dval);
#else
{
double x;
errno = 0;
if (sp->type != C_DOUBLE)
cast1_to_d(sp);
x = sp->dval;
sp->dval = sqrt(sp->dval);
if (errno)
fplib_err("sqrt", x, "domain error");
}
#endif
return_CELL("bi_sqrt", sp);
}
#if defined(mawk_srand) || defined(mawk_rand)
#define USE_SYSTEM_SRAND
#else
/* For portability, we'll use our own random number generator , taken
from: Park, SK and Miller KW, "Random Number Generators:
Good Ones are Hard to Find", CACM, 31, 1192-1201, 1988.
*/
static long seed; /* must be >=1 and < 2^31-1 */
static CELL cseed; /* argument of last call to srand() */
#define M 0x7fffffff /* 2^31-1 */
#define MX 0xffffffff
#define A 16807
#define Q 127773 /* M/A */
#define R 2836 /* M%A */
#if M == MAX__LONG
#define crank(s) s = A * (s % Q) - R * (s / Q) ;\
if ( s <= 0 ) s += M
#else
/* 64 bit longs */
#define crank(s) { unsigned long t = (unsigned long) s ;\
t = (A * (t % Q) - R * (t / Q)) & MX ;\
if ( t >= M ) t = (t+M)&M ;\
s = (long) t ;\
}
#endif /* M == MAX__LONG */
#endif /* defined(mawk_srand) || defined(mawk_rand) */
CELL *
bi_srand(CELL * sp)
{
#ifdef USE_SYSTEM_SRAND
static long seed = 1;
static CELL cseed =
{
C_DOUBLE, 0, 0, 1.0
};
#endif
CELL c;
TRACE_FUNC("bi_srand", sp);
if (sp->type == C_NOINIT) /* seed off clock */
{
time_t secs = time((time_t *) 0);
cellcpy(sp, &cseed);
cell_destroy(&cseed);
cseed.type = C_DOUBLE;
cseed.dval = (double) secs;
} else { /* user seed */
sp--;
/* swap cseed and *sp ; don't need to adjust ref_cnts */
c = *sp;
*sp = cseed;
cseed = c;
}
#ifdef USE_SYSTEM_SRAND
seed = d_to_i(cseed.dval);
mawk_srand((unsigned) seed);
#else
/* The old seed is now in *sp ; move the value in cseed to
seed in range [1,M) */
cellcpy(&c, &cseed);
if (c.type == C_NOINIT)
cast1_to_d(&c);
seed = ((c.type == C_DOUBLE)
? (long) (d_to_i(c.dval) & M) % M + 1
: (long) hash(string(&c)->str) % M + 1);
if (seed == M)
seed = M - 1;
cell_destroy(&c);
/* crank it once so close seeds don't give a close
first result */
crank(seed);
#endif
return_CELL("bi_srand", sp);
}
CELL *
bi_rand(CELL * sp)
{
TRACE_FUNC("bi_rand", sp);
#ifdef USE_SYSTEM_SRAND
{
long value = (long) mawk_rand();
sp++;
sp->type = C_DOUBLE;
sp->dval = ((double) value) / RAND_MAX;
}
#else
crank(seed);
sp++;
sp->type = C_DOUBLE;
sp->dval = (double) seed / (double) M;
#endif
return_CELL("bi_rand", sp);
}
#undef A
#undef M
#undef MX
#undef Q
#undef R
#undef crank
/*************************************************
miscellaneous builtins
close, system and getline
fflush
*************************************************/
CELL *
bi_close(CELL * sp)
{
int x;
TRACE_FUNC("bi_close", sp);
if (sp->type < C_STRING)
cast1_to_s(sp);
x = file_close((STRING *) sp->ptr);
free_STRING(string(sp));
sp->type = C_DOUBLE;
sp->dval = (double) x;
return_CELL("bi_close", sp);
}
CELL *
bi_fflush(CELL * sp)
{
int ret = 0;
TRACE_FUNC("bi_fflush", sp);
if (sp->type == 0)
fflush(stdout);
else {
sp--;
if (sp->type < C_STRING)
cast1_to_s(sp);
ret = file_flush(string(sp));
free_STRING(string(sp));
}
sp->type = C_DOUBLE;
sp->dval = (double) ret;
return_CELL("bi_fflush", sp);
}
CELL *
bi_system(CELL * sp GCC_UNUSED)
{
#ifdef HAVE_REAL_PIPES
int pid;
unsigned ret_val;
TRACE_FUNC("bi_system", sp);
if (sp->type < C_STRING)
cast1_to_s(sp);
flush_all_output();
switch (pid = fork()) {
case -1: /* fork failed */
errmsg(errno, "could not create a new process");
ret_val = 127;
break;
case 0: /* the child */
execl(shell, shell, "-c", string(sp)->str, (char *) 0);
/* if get here, execl() failed */
errmsg(errno, "execute of %s failed", shell);
fflush(stderr);
_exit(127);
default: /* wait for the child */
ret_val = (unsigned) wait_for(pid);
break;
}
cell_destroy(sp);
sp->type = C_DOUBLE;
sp->dval = (double) ret_val;
#elif defined(MSDOS)
int retval;
if (sp->type < C_STRING)
cast1_to_s(sp);
retval = DOSexec(string(sp)->str);
free_STRING(string(sp));
sp->type = C_DOUBLE;
sp->dval = (double) retval;
#else
sp = 0;
#endif
return_CELL("bi_system", sp);
}
/* getline() */
/* if type == 0 : stack is 0 , target address
if type == F_IN : stack is F_IN, expr(filename), target address
if type == PIPE_IN : stack is PIPE_IN, target address, expr(pipename)
*/
CELL *
bi_getline(CELL * sp)
{
CELL tc;
CELL *cp = 0;
char *p = 0;
size_t len;
FIN *fin_p;
TRACE_FUNC("bi_getline", sp);
switch (sp->type) {
case 0:
sp--;
if (!main_fin)
open_main();
if (!(p = FINgets(main_fin, &len)))
goto eof;
cp = (CELL *) sp->ptr;
if (TEST2(NR) != TWO_DOUBLES)
cast2_to_d(NR);
NR->dval += 1.0;
rt_nr++;
FNR->dval += 1.0;
rt_fnr++;