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unit.c
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/*
Copyright (C) 2016-2019 Christoph Berg
This program 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 2 of the License, or
(at your option) any later version.
This program 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.
*/
#include "postgres.h"
#include "fmgr.h"
#include "libpq/pqformat.h" /* send/recv */
#include "utils/builtins.h" /* cstring_to_text (needed on 9.5) */
#include "utils/guc.h"
#if PG_VERSION_NUM >= 120000
#include "utils/float.h" /* extra_float_digits */
#endif
#include "utils/hsearch.h"
#include <math.h>
#include "unit.h"
#include "defined_units.h"
#include "powers.h"
#include "float8out_unit.h"
/* global variables */
static bool unit_output_superscript;
static bool unit_time_output_custom;
static bool unit_byte_output_iec;
static bool unit_output_base_units;
HTAB *unit_names;
static HTAB *unit_dimensions;
/* unit definitions */
void unit_get_definitions(void);
void
unit_get_definitions(void)
{
HASHCTL hinfo = { 0 };
int i;
unit_names_t *unit_name;
unit_dimensions_t *unit_dim;
static HTAB *tmp_unit_names;
static HTAB *tmp_unit_dimensions;
/* unit_names: char *name -> Unit unit
* Lookup table that initially contains the base units and will cache all
* units resolved at run time
*/
hinfo.keysize = UNIT_NAME_LENGTH;
hinfo.entrysize = sizeof(unit_names_t);
Assert(UNIT_NAME_LENGTH + sizeof(UnitShift) == sizeof(unit_names_t));
tmp_unit_names = hash_create("unit_names",
20,
&hinfo,
HASH_ELEM); /* Set keysize and entrysize */
PG_TRY();
{
for (i = 0; i < N_UNITS; i++)
{
unit_name = hash_search(tmp_unit_names,
base_units[i],
HASH_ENTER,
NULL);
strlcpy(unit_name->name, base_units[i], UNIT_NAME_LENGTH);
unit_name->unit_shift.unit.value = 1.0;
memset(unit_name->unit_shift.unit.units, 0, N_UNITS);
unit_name->unit_shift.unit.units[i] = 1;
unit_name->unit_shift.shift = 0.0;
}
}
PG_CATCH();
{
/* free partially initialized table */
hash_destroy(tmp_unit_names);
PG_RE_THROW();
}
PG_END_TRY();
/* No OOM errors were thrown, use the new table */
if (unit_names)
hash_destroy(unit_names);
unit_names = tmp_unit_names;
/* unit_dimensions: char dimension[N_UNITS] -> char *name
* Lookup table for formatting the well-known derived units on output
*/
hinfo.keysize = N_UNITS;
hinfo.entrysize = sizeof(unit_dimensions_t);
Assert(N_UNITS + UNIT_NAME_LENGTH == sizeof(unit_dimensions_t));
tmp_unit_dimensions = hash_create("unit_dimensions",
20,
&hinfo,
HASH_ELEM | HASH_BLOBS);
PG_TRY();
{
for (i = 0; si_derived_units[i].name; i++)
{
unit_dim = hash_search(tmp_unit_dimensions,
si_derived_units[i].units,
HASH_ENTER,
NULL);
memcpy(unit_dim->units, si_derived_units[i].units, N_UNITS);
strlcpy(unit_dim->name, si_derived_units[i].name, UNIT_NAME_LENGTH);
}
}
PG_CATCH();
{
/* free partially initialized table */
hash_destroy(tmp_unit_dimensions);
PG_RE_THROW();
}
PG_END_TRY();
/* No OOM errors were thrown, use the new table */
if (unit_dimensions)
hash_destroy(unit_dimensions);
unit_dimensions = tmp_unit_dimensions;
}
/* module initialization */
PG_MODULE_MAGIC;
void _PG_init(void);
void
_PG_init(void)
{
DefineCustomBoolVariable("unit.output_superscript",
"Output unit exponents using Unicode superscripts",
"Set to on to output unit exponents using Unicode superscripts",
&unit_output_superscript,
false,
PGC_USERSET,
0, /* no flags */
NULL,
NULL,
NULL);
DefineCustomBoolVariable("unit.time_output_custom",
"Output time values in minutes, hours, days, and julianyears",
"Set to on to output time unit values greater or equal to 60 s "
"using minutes, hours, days, and julianyears instead of seconds "
"with SI prefixes",
&unit_time_output_custom,
true,
PGC_USERSET,
0, /* no flags */
NULL,
NULL,
NULL);
DefineCustomBoolVariable("unit.byte_output_iec",
"Output byte unit values with binary IEC prefixes",
"Set to on to output byte unit values using binary IEC prefixes "
"instead of decimal SI prefixes",
&unit_byte_output_iec,
false,
PGC_USERSET,
0, /* no flags */
NULL,
NULL,
NULL);
DefineCustomBoolVariable("unit.output_base_units",
"Output unit values using base units without prefixes",
"Set to on to output unit values using base units only "
"and without prefixes",
&unit_output_base_units,
false,
PGC_USERSET,
0, /* no flags */
NULL,
NULL,
NULL);
EmitWarningsOnPlaceholders("unit");
unit_get_definitions();
}
/* internal functions */
static char *superscripts[] = {
"⁰",
"¹",
"²",
"³",
"⁴",
"⁵",
"⁶",
"⁷",
"⁸",
"⁹",
};
static void
print_exponent (char **output_p, int e)
{
if (unit_output_superscript) {
char ascii_exp[5];
int i = 0;
sprintf(ascii_exp, "%d", e);
if (ascii_exp[0] == '-') {
*output_p += sprintf(*output_p, "%s", "⁻");
i++;
}
for (; ascii_exp[i] != '\0'; i++) {
Assert (ascii_exp[i] >= '0' && ascii_exp[i] <= '9');
*output_p += sprintf(*output_p, "%s", superscripts[ascii_exp[i] - '0']);
}
} else {
*output_p += sprintf(*output_p, "^%d", e);
}
}
/* this function is used to format time values of at least one minute */
static void
print_time_interval (char **output_p, double t)
{
int h, m;
char *sign = "+";
int ndig;
/* print - */
if (t < 0) {
*output_p += sprintf(*output_p, "-");
t = -t;
sign = "-";
}
ndig = DBL_DIG
#if PG_VERSION_NUM >= 120000
+ (extra_float_digits == 1 ? 0 : extra_float_digits) /* revert to pre-12 default */
#else
+ extra_float_digits
#endif
- log10(t); /* adjust seconds precision for d/h/min already printed */
/* print years */
if (t >= TIME_YEAR) {
double years = trunc(t / TIME_YEAR);
t = fmod(t, TIME_YEAR);
*output_p += sprintf(*output_p, "%g " TIME_YEAR_NAME, years);
if (t != 0)
*output_p += sprintf(*output_p, " %s ", sign);
}
if (t == 0)
return;
/* print days */
if (t >= TIME_DAY) {
int days = trunc(t / TIME_DAY);
t = fmod(t, TIME_DAY);
*output_p += sprintf(*output_p, "%d d", days);
if (t != 0)
*output_p += sprintf(*output_p, " %s ", sign);
}
if (t == 0)
return;
/* print hh:mm: */
h = trunc(t / TIME_HOUR);
t = fmod(t, TIME_HOUR);
m = trunc(t / TIME_MINUTE);
t = fmod(t, TIME_MINUTE);
*output_p += sprintf(*output_p, "%02d:%02d:", h, m);
/* print ss.sss */
if (t < 10.0) /* zero-pad */
*output_p += sprintf(*output_p, "0");
if (ndig < 0)
ndig = 0;
*output_p += sprintf(*output_p, "%.*f", ndig, t);
if (ndig > 0) {
/* strip trailing zeros from %f format */
while (*(*output_p - 1) == '0') {
--*output_p;
}
if (*(*output_p - 1) == '.') {
--*output_p;
}
**output_p = '\0';
}
*output_p += sprintf(*output_p, " s");
}
/* format Unit as string */
char *
unit_cstring (Unit *unit)
{
int i;
int n_numerator = 0;
int u_numerator = -1;
unit_dimensions_t *derived_unit = NULL;
char *output;
char *output_p;
bool numerator = false;
bool denominator = false;
/* check if this is a combination of base units we have a specific name for */
derived_unit = hash_search(unit_dimensions,
unit->units,
HASH_FIND,
NULL);
if (! derived_unit) /* otherwise, sum up positive exponents */
for (i = 0; i < N_UNITS; i++) {
if (unit->units[i] > 0) {
n_numerator += unit->units[i];
u_numerator = i;
}
}
output_p = output = palloc(128);
#define print_output(...) output_p += sprintf(output_p, __VA_ARGS__);
/* case 1a: kg in numerator (exponent 1): print with SI prefix */
if (!unit_output_base_units && n_numerator == 1 && u_numerator == UNIT_kg) {
double v_abs = fabs(unit->value);
char *prefix = "k";
double factor = 1.0;
if (v_abs >= POWER_24) {
/* do nothing */
} else if (v_abs >= POWER_21) {
prefix = "Y"; factor = 1e-21;
} else if (v_abs >= POWER_18) {
prefix = "Z"; factor = 1e-18;
} else if (v_abs >= POWER_15) {
prefix = "E"; factor = 1e-15;
} else if (v_abs >= POWER_12) {
prefix = "P"; factor = 1e-12;
} else if (v_abs >= POWER_9) {
prefix = "T"; factor = 1e-9;
} else if (v_abs >= POWER_6) {
prefix = "G"; factor = 1e-6;
} else if (v_abs >= POWER_3) {
prefix = "M"; factor = 1e-3;
} else if (v_abs >= POWER_0) {
prefix = "k";
} else if (v_abs >= POWER__3) {
prefix = ""; factor = 1e3;
} else if (v_abs >= POWER__6) {
prefix = "m"; factor = 1e6;
} else if (v_abs >= POWER__9) {
prefix = "µ"; factor = 1e9;
} else if (v_abs >= POWER__12) {
prefix = "n"; factor = 1e12;
} else if (v_abs >= POWER__15) {
prefix = "p"; factor = 1e15;
} else if (v_abs >= POWER__18) {
prefix = "f"; factor = 1e18;
} else if (v_abs >= POWER__21) {
prefix = "a"; factor = 1e21;
} else if (v_abs >= POWER__24) {
prefix = "z"; factor = 1e24;
} else if (v_abs >= POWER__27) {
prefix = "y"; factor = 1e27;
} /* else: smaller value or 0 (or -0), print using kg */
print_output("%s %sg", float8out_unit (unit->value * factor),
prefix); /* gram with SI prefix */
numerator = true;
/* case 1b: byte in numerator (exponent 1), and binary IEC prefix requested */
} else if (!unit_output_base_units && n_numerator == 1 && u_numerator == UNIT_B && unit_byte_output_iec) {
double v_abs = fabs(unit->value);
char *prefix = "";
double factor = 1.0;
if (v_abs >= 0x1p+90) {
// do nothing
} else if (v_abs >= 0x1p+80) {
prefix = "Yi"; factor = 0x1p-80;
} else if (v_abs >= 0x1p+70) {
prefix = "Zi"; factor = 0x1p-70;
} else if (v_abs >= 0x1p+60) {
prefix = "Ei"; factor = 0x1p-60;
} else if (v_abs >= 0x1p+50) {
prefix = "Pi"; factor = 0x1p-50;
} else if (v_abs >= 0x1p+40) {
prefix = "Ti"; factor = 0x1p-40;
} else if (v_abs >= 0x1p+30) {
prefix = "Gi"; factor = 0x1p-30;
} else if (v_abs >= 0x1p+20) {
prefix = "Mi"; factor = 0x1p-20;
} else if (v_abs >= 0x1p+10) {
prefix = "Ki"; factor = 0x1p-10;
} /* else do nothing */
print_output("%s %sB", float8out_unit (unit->value * factor),
prefix); /* byte with binary prefix */
numerator = true;
/* case 2: derived unit, or numerator with exactly one unit (exponent 1)
* not covered above */
} else if (!unit_output_base_units && (derived_unit || n_numerator == 1)) {
double v_abs = fabs(unit->value);
char *prefix = "";
double factor = 1.0;
char *unit_name = derived_unit ? derived_unit->name : (char *)base_units[u_numerator];
/* case 2a: minute/hour/day output requested, unit is seconds, and
* absolute value is >= 60 seconds. Print as interval and exit */
if (unit_time_output_custom && derived_unit &&
!strcmp(derived_unit->name, "s") && v_abs >= TIME_MINUTE) {
print_time_interval(&output_p, unit->value);
return output;
}
if (v_abs >= 1e27) {
// do nothing
} else if (v_abs >= POWER_24) {
prefix = "Y"; factor = 1e-24;
} else if (v_abs >= POWER_21) {
prefix = "Z"; factor = 1e-21;
} else if (v_abs >= POWER_18) {
prefix = "E"; factor = 1e-18;
} else if (v_abs >= POWER_15) {
prefix = "P"; factor = 1e-15;
} else if (v_abs >= POWER_12) {
prefix = "T"; factor = 1e-12;
} else if (v_abs >= POWER_9) {
prefix = "G"; factor = 1e-9;
if (!strcmp(unit_name, "s"))
unit_name = "sec"; /* avoid Gs because it's gauss, not time */
} else if (v_abs >= POWER_6) {
prefix = "M"; factor = 1e-6;
} else if (v_abs >= POWER_3) {
prefix = "k"; factor = 1e-3;
} else if (v_abs >= POWER_0) {
// do nothing
} else if (v_abs >= POWER__3) {
prefix = "m"; factor = 1e3;
} else if (v_abs >= POWER__6) {
prefix = "µ"; factor = 1e6;
} else if (v_abs >= POWER__9) {
prefix = "n"; factor = 1e9;
} else if (v_abs >= POWER__12) {
prefix = "p"; factor = 1e12;
} else if (v_abs >= POWER__15) {
prefix = "f"; factor = 1e15;
} else if (v_abs >= POWER__18) {
prefix = "a"; factor = 1e18;
} else if (v_abs >= POWER__21) {
prefix = "z"; factor = 1e21;
} else if (v_abs >= POWER__24) {
prefix = "y"; factor = 1e24;
} /* else do nothing */
/* print with SI prefix */
print_output("%s %s%s", float8out_unit (unit->value * factor),
prefix, unit_name);
/* case 2b: derived unit: stop here */
if (derived_unit)
return output;
/* case 2c: single unit in numerator (exponent 1): continue */
numerator = true;
/* case 3: zero or more than one unit in numerator */
} else {
/* always use scientific notation here */
print_output("%s", float8out_unit (unit->value));
for (i = 0; i < N_UNITS; i++) /* format units in numerator */
if (unit->units[i] > 0) {
print_output("%s%s", numerator ? "*" : " ", base_units[i]);
if (unit->units[i] > 1)
print_exponent(&output_p, unit->units[i]);
numerator = true;
}
}
/* print units in denominator */
for (i = 0; i < N_UNITS; i++) /* format units in denominator */
if (unit->units[i] < 0) {
if (numerator) { /* format as .../a^x*b^y */
print_output("%s%s", denominator ? "*" : "/", base_units[i]);
if (unit->units[i] < -1)
print_exponent(&output_p, -unit->units[i]);
} else { /* format as a^-x*b^-y */
print_output("%s%s", denominator ? "*" : " ", base_units[i]);
print_exponent(&output_p, unit->units[i]);
}
denominator = true;
}
/* done */
return output;
}
/* input and output */
char *yyerrstr; /* copy of error catched by yyuniterror() */
void yyuniterror (char *s);
void
yyuniterror (char *s)
{
/* store error for later use in unit_in */
yyerrstr = pstrdup(s);
}
/* needs search_path = @extschema@ due to use of unit_parse() */
PG_FUNCTION_INFO_V1 (unit_in);
Datum
unit_in (PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
UnitShift *result;
result = (UnitShift *) palloc(sizeof(UnitShift));
if (unit_parse(str, result) > 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for unit: \"%s\", %s",
str, yyerrstr)));
PG_RETURN_POINTER(&result->unit);
}
PG_FUNCTION_INFO_V1(unit_out);
Datum
unit_out(PG_FUNCTION_ARGS)
{
Unit *unit = (Unit *) PG_GETARG_POINTER(0);
PG_RETURN_CSTRING(unit_cstring(unit));
}
PG_FUNCTION_INFO_V1(unit_recv);
Datum
unit_recv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
Unit *unit = palloc(sizeof(Unit));
unit->value = pq_getmsgfloat8(buf);
memcpy(unit->units, pq_getmsgbytes(buf, N_UNITS), N_UNITS);
PG_RETURN_POINTER(unit);
}
PG_FUNCTION_INFO_V1(unit_send);
Datum
unit_send(PG_FUNCTION_ARGS)
{
Unit *unit = (Unit *) PG_GETARG_POINTER(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendfloat8(&buf, unit->value);
pq_sendbytes(&buf, (const char *)unit->units, N_UNITS);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/* constructors */
PG_FUNCTION_INFO_V1 (dbl2unit);
Datum
dbl2unit (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_meter);
Datum
unit_meter (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_m] = 1;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_kilogram);
Datum
unit_kilogram (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_kg] = 1;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_second);
Datum
unit_second (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_s] = 1;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_ampere);
Datum
unit_ampere (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_A] = 1;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_kelvin);
Datum
unit_kelvin (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_K] = 1;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_mole);
Datum
unit_mole (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_mol] = 1;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_candela);
Datum
unit_candela (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_cd] = 1;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1 (unit_byte);
Datum
unit_byte (PG_FUNCTION_ARGS)
{
Unit *result;
result = (Unit *) palloc0(sizeof(Unit));
result->value = PG_GETARG_FLOAT8(0);
result->units[UNIT_B] = 1;
PG_RETURN_POINTER(result);
}
/* functions without operators */
PG_FUNCTION_INFO_V1(unit_value);
Datum
unit_value(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
PG_RETURN_FLOAT8(a->value);
}
PG_FUNCTION_INFO_V1(unit_dimension);
Datum
unit_dimension(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
result->value = 1;
memcpy(result->units, a->units, N_UNITS);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_round);
Datum
unit_round(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
result->value = round(a->value);
memcpy(result->units, a->units, N_UNITS);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_diff);
Datum
unit_diff(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *b = (Unit *) PG_GETARG_POINTER(1);
Unit result;
unit_sub_internal(a, b, &result);
PG_RETURN_FLOAT8(result.value);
}
/* operators */
PG_FUNCTION_INFO_V1(unit_add);
Datum
unit_add(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *b = (Unit *) PG_GETARG_POINTER(1);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
unit_add_internal(a, b, result);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_sub);
Datum
unit_sub(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *b = (Unit *) PG_GETARG_POINTER(1);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
unit_sub_internal(a, b, result);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_neg);
Datum
unit_neg(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
result->value = - a->value;
memcpy(result->units, a->units, N_UNITS);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_mul);
Datum
unit_mul(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *b = (Unit *) PG_GETARG_POINTER(1);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
unit_mult_internal(a, b, result);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(dbl_unit_mul);
Datum
dbl_unit_mul(PG_FUNCTION_ARGS)
{
double a = PG_GETARG_FLOAT8(0);
Unit *b = (Unit *) PG_GETARG_POINTER(1);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
result->value = a * b->value;
memcpy(result->units, b->units, N_UNITS);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_dbl_mul);
Datum
unit_dbl_mul(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
double b = PG_GETARG_FLOAT8(1);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
result->value = a->value * b;
memcpy(result->units, a->units, N_UNITS);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_div);
Datum
unit_div(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *b = (Unit *) PG_GETARG_POINTER(1);
Unit *result;
result = (Unit *) palloc(sizeof(Unit));
unit_div_internal(a, b, result);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(dbl_unit_div);
Datum
dbl_unit_div(PG_FUNCTION_ARGS)
{
double a = PG_GETARG_FLOAT8(0);
Unit *b = (Unit *) PG_GETARG_POINTER(1);
Unit *result;
int i;
if (b->value == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero-valued unit: \"%s\"",
unit_cstring(b))));
result = (Unit *) palloc(sizeof(Unit));
result->value = a / b->value;
for (i = 0; i < N_UNITS; i++)
result->units[i] = - b->units[i];
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_dbl_div);
Datum
unit_dbl_div(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
double b = PG_GETARG_FLOAT8(1);
Unit *result;
if (b == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division of unit by zero")));
result = (Unit *) palloc(sizeof(Unit));
result->value = a->value / b;
memcpy(result->units, a->units, N_UNITS);
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_pow);
Datum
unit_pow(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
int b = PG_GETARG_INT32(1);
Unit *result;
int i;
result = (Unit *) palloc(sizeof(Unit));
result->value = pow(a->value, b);
for (i = 0; i < N_UNITS; i++)
result->units[i] = a->units[i] * b;
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_sqrt);
Datum
unit_sqrt(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *result;
int i;
/* compute root of value */
if (a->value < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_POWER_FUNCTION),
errmsg("cannot take square root of a negative-valued unit")));
result = (Unit *) palloc(sizeof(Unit));
result->value = sqrt(a->value);
/* compute root of base units */
for (i = 0; i < N_UNITS; i++)
{
if (a->units[i] % 2 != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_POWER_FUNCTION),
errmsg("cannot take square root of a unit with odd \"%s\" exponent",
base_units[i])));
result->units[i] = a->units[i] >> 1;
}
PG_RETURN_POINTER(result);
}
PG_FUNCTION_INFO_V1(unit_cbrt);
Datum
unit_cbrt(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
Unit *result;
int i;
/* compute root of value */
result = (Unit *) palloc(sizeof(Unit));
result->value = cbrt(a->value);
/* compute root of base units */
for (i = 0; i < N_UNITS; i++)
{
if (a->units[i] % 3 != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_ARGUMENT_FOR_POWER_FUNCTION),
errmsg("cannot take cube root of a unit with \"%s\" exponent not divisible by three",
base_units[i])));
result->units[i] = a->units[i] / 3;
}
PG_RETURN_POINTER(result);
}
/* obsolete version of unit_at_text used in v1..3 */
/* needs search_path = @extschema@ due to use of unit_parse() */
PG_FUNCTION_INFO_V1(unit_at);
Datum
unit_at(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
char *b = PG_GETARG_CSTRING(1);
UnitShift bu;
if (unit_parse(b, &bu) > 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for unit: \"%s\", %s",
b, yyerrstr)));
test_same_dimension("@", a, &bu.unit);
if (bu.unit.value == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero-valued unit: \"%s\"", b)));
PG_RETURN_CSTRING(psprintf("%s %s%s",
float8out_unit ((a->value - bu.shift) / bu.unit.value),
(atof(b) > 0 ? "* " : ""),
b));
}
/* obsolete version of unit_at_text2 used in v4..6 */
/* needs search_path = @extschema@ due to use of unit_parse() */
PG_FUNCTION_INFO_V1(unit_at_text);
Datum
unit_at_text(PG_FUNCTION_ARGS)
{
Unit *a = (Unit *) PG_GETARG_POINTER(0);
char *b = text_to_cstring(PG_GETARG_TEXT_PP(1));