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postgresql/src/backend/utils/adt/cash.c

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/*
* cash.c
* Written by D'Arcy J.M. Cain
* darcy@druid.net
* http://www.druid.net/darcy/
*
* Functions to allow input and output of money normally but store
* and handle it as 64 bit ints
*
* A slightly modified version of this file and a discussion of the
* workings can be found in the book "Software Solutions in C" by
* Dale Schumacher, Academic Press, ISBN: 0-12-632360-7 except that
* this version handles 64 bit numbers and so can hold values up to
* $92,233,720,368,547,758.07.
*
* src/backend/utils/adt/cash.c
*/
#include "postgres.h"
#include <limits.h>
#include <ctype.h>
#include <math.h>
#include "common/int.h"
#include "libpq/pqformat.h"
#include "utils/builtins.h"
#include "utils/cash.h"
#include "utils/numeric.h"
#include "utils/pg_locale.h"
/*************************************************************************
* Private routines
************************************************************************/
static const char *
num_word(Cash value)
{
static char buf[128];
static const char *const small[] = {
"zero", "one", "two", "three", "four", "five", "six", "seven",
"eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen",
"fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty",
"thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"
};
const char *const *big = small + 18;
int tu = value % 100;
/* deal with the simple cases first */
if (value <= 20)
return small[value];
/* is it an even multiple of 100? */
if (!tu)
{
sprintf(buf, "%s hundred", small[value / 100]);
return buf;
}
/* more than 99? */
if (value > 99)
{
/* is it an even multiple of 10 other than 10? */
if (value % 10 == 0 && tu > 10)
sprintf(buf, "%s hundred %s",
small[value / 100], big[tu / 10]);
else if (tu < 20)
sprintf(buf, "%s hundred and %s",
small[value / 100], small[tu]);
else
sprintf(buf, "%s hundred %s %s",
small[value / 100], big[tu / 10], small[tu % 10]);
}
else
{
/* is it an even multiple of 10 other than 10? */
if (value % 10 == 0 && tu > 10)
sprintf(buf, "%s", big[tu / 10]);
else if (tu < 20)
sprintf(buf, "%s", small[tu]);
else
sprintf(buf, "%s %s", big[tu / 10], small[tu % 10]);
}
return buf;
} /* num_word() */
/* cash_in()
* Convert a string to a cash data type.
* Format is [$]###[,]###[.##]
* Examples: 123.45 $123.45 $123,456.78
*
*/
Datum
cash_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
Node *escontext = fcinfo->context;
Cash result;
Cash value = 0;
Cash dec = 0;
Cash sgn = 1;
bool seen_dot = false;
const char *s = str;
int fpoint;
char dsymbol;
const char *ssymbol,
*psymbol,
*nsymbol,
*csymbol;
struct lconv *lconvert = PGLC_localeconv();
/*
* frac_digits will be CHAR_MAX in some locales, notably C. However, just
* testing for == CHAR_MAX is risky, because of compilers like gcc that
* "helpfully" let you alter the platform-standard definition of whether
* char is signed or not. If we are so unfortunate as to get compiled
* with a nonstandard -fsigned-char or -funsigned-char switch, then our
* idea of CHAR_MAX will not agree with libc's. The safest course is not
* to test for CHAR_MAX at all, but to impose a range check for plausible
* frac_digits values.
*/
fpoint = lconvert->frac_digits;
if (fpoint < 0 || fpoint > 10)
fpoint = 2; /* best guess in this case, I think */
/* we restrict dsymbol to be a single byte, but not the other symbols */
if (*lconvert->mon_decimal_point != '\0' &&
lconvert->mon_decimal_point[1] == '\0')
dsymbol = *lconvert->mon_decimal_point;
else
dsymbol = '.';
if (*lconvert->mon_thousands_sep != '\0')
ssymbol = lconvert->mon_thousands_sep;
else /* ssymbol should not equal dsymbol */
ssymbol = (dsymbol != ',') ? "," : ".";
csymbol = (*lconvert->currency_symbol != '\0') ? lconvert->currency_symbol : "$";
psymbol = (*lconvert->positive_sign != '\0') ? lconvert->positive_sign : "+";
nsymbol = (*lconvert->negative_sign != '\0') ? lconvert->negative_sign : "-";
#ifdef CASHDEBUG
printf("cashin- precision '%d'; decimal '%c'; thousands '%s'; currency '%s'; positive '%s'; negative '%s'\n",
fpoint, dsymbol, ssymbol, csymbol, psymbol, nsymbol);
#endif
/* we need to add all sorts of checking here. For now just */
/* strip all leading whitespace and any leading currency symbol */
while (isspace((unsigned char) *s))
s++;
if (strncmp(s, csymbol, strlen(csymbol)) == 0)
s += strlen(csymbol);
while (isspace((unsigned char) *s))
s++;
#ifdef CASHDEBUG
printf("cashin- string is '%s'\n", s);
#endif
/* a leading minus or paren signifies a negative number */
/* again, better heuristics needed */
/* XXX - doesn't properly check for balanced parens - djmc */
if (strncmp(s, nsymbol, strlen(nsymbol)) == 0)
{
sgn = -1;
s += strlen(nsymbol);
}
else if (*s == '(')
{
sgn = -1;
s++;
}
else if (strncmp(s, psymbol, strlen(psymbol)) == 0)
s += strlen(psymbol);
#ifdef CASHDEBUG
printf("cashin- string is '%s'\n", s);
#endif
/* allow whitespace and currency symbol after the sign, too */
while (isspace((unsigned char) *s))
s++;
if (strncmp(s, csymbol, strlen(csymbol)) == 0)
s += strlen(csymbol);
while (isspace((unsigned char) *s))
s++;
#ifdef CASHDEBUG
printf("cashin- string is '%s'\n", s);
#endif
/*
* We accumulate the absolute amount in "value" and then apply the sign at
* the end. (The sign can appear before or after the digits, so it would
* be more complicated to do otherwise.) Because of the larger range of
* negative signed integers, we build "value" in the negative and then
* flip the sign at the end, catching most-negative-number overflow if
* necessary.
*/
for (; *s; s++)
{
/*
* We look for digits as long as we have found less than the required
* number of decimal places.
*/
if (isdigit((unsigned char) *s) && (!seen_dot || dec < fpoint))
{
int8 digit = *s - '0';
if (pg_mul_s64_overflow(value, 10, &value) ||
pg_sub_s64_overflow(value, digit, &value))
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("value \"%s\" is out of range for type %s",
str, "money")));
if (seen_dot)
dec++;
}
/* decimal point? then start counting fractions... */
else if (*s == dsymbol && !seen_dot)
{
seen_dot = true;
}
/* ignore if "thousands" separator, else we're done */
else if (strncmp(s, ssymbol, strlen(ssymbol)) == 0)
s += strlen(ssymbol) - 1;
else
break;
}
/* round off if there's another digit */
if (isdigit((unsigned char) *s) && *s >= '5')
{
/* remember we build the value in the negative */
if (pg_sub_s64_overflow(value, 1, &value))
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("value \"%s\" is out of range for type %s",
str, "money")));
}
/* adjust for less than required decimal places */
for (; dec < fpoint; dec++)
{
if (pg_mul_s64_overflow(value, 10, &value))
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("value \"%s\" is out of range for type %s",
str, "money")));
}
/*
* should only be trailing digits followed by whitespace, right paren,
* trailing sign, and/or trailing currency symbol
*/
while (isdigit((unsigned char) *s))
s++;
while (*s)
{
if (isspace((unsigned char) *s) || *s == ')')
s++;
else if (strncmp(s, nsymbol, strlen(nsymbol)) == 0)
{
sgn = -1;
s += strlen(nsymbol);
}
else if (strncmp(s, psymbol, strlen(psymbol)) == 0)
s += strlen(psymbol);
else if (strncmp(s, csymbol, strlen(csymbol)) == 0)
s += strlen(csymbol);
else
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type %s: \"%s\"",
"money", str)));
}
/*
* If the value is supposed to be positive, flip the sign, but check for
* the most negative number.
*/
if (sgn > 0)
{
if (value == PG_INT64_MIN)
ereturn(escontext, (Datum) 0,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("value \"%s\" is out of range for type %s",
str, "money")));
result = -value;
}
else
result = value;
#ifdef CASHDEBUG
printf("cashin- result is " INT64_FORMAT "\n", result);
#endif
PG_RETURN_CASH(result);
}
/* cash_out()
* Function to convert cash to a dollars and cents representation, using
* the lc_monetary locale's formatting.
*/
Datum
cash_out(PG_FUNCTION_ARGS)
{
Cash value = PG_GETARG_CASH(0);
char *result;
char buf[128];
char *bufptr;
int digit_pos;
int points,
mon_group;
char dsymbol;
const char *ssymbol,
*csymbol,
*signsymbol;
char sign_posn,
cs_precedes,
sep_by_space;
struct lconv *lconvert = PGLC_localeconv();
/* see comments about frac_digits in cash_in() */
points = lconvert->frac_digits;
if (points < 0 || points > 10)
points = 2; /* best guess in this case, I think */
/*
* As with frac_digits, must apply a range check to mon_grouping to avoid
* being fooled by variant CHAR_MAX values.
*/
mon_group = *lconvert->mon_grouping;
if (mon_group <= 0 || mon_group > 6)
mon_group = 3;
/* we restrict dsymbol to be a single byte, but not the other symbols */
if (*lconvert->mon_decimal_point != '\0' &&
lconvert->mon_decimal_point[1] == '\0')
dsymbol = *lconvert->mon_decimal_point;
else
dsymbol = '.';
if (*lconvert->mon_thousands_sep != '\0')
ssymbol = lconvert->mon_thousands_sep;
else /* ssymbol should not equal dsymbol */
ssymbol = (dsymbol != ',') ? "," : ".";
csymbol = (*lconvert->currency_symbol != '\0') ? lconvert->currency_symbol : "$";
if (value < 0)
{
/* make the amount positive for digit-reconstruction loop */
value = -value;
/* set up formatting data */
signsymbol = (*lconvert->negative_sign != '\0') ? lconvert->negative_sign : "-";
sign_posn = lconvert->n_sign_posn;
cs_precedes = lconvert->n_cs_precedes;
sep_by_space = lconvert->n_sep_by_space;
}
else
{
signsymbol = lconvert->positive_sign;
sign_posn = lconvert->p_sign_posn;
cs_precedes = lconvert->p_cs_precedes;
sep_by_space = lconvert->p_sep_by_space;
}
/* we build the digits+decimal-point+sep string right-to-left in buf[] */
bufptr = buf + sizeof(buf) - 1;
*bufptr = '\0';
/*
* Generate digits till there are no non-zero digits left and we emitted
* at least one to the left of the decimal point. digit_pos is the
* current digit position, with zero as the digit just left of the decimal
* point, increasing to the right.
*/
digit_pos = points;
do
{
if (points && digit_pos == 0)
{
/* insert decimal point, but not if value cannot be fractional */
*(--bufptr) = dsymbol;
}
else if (digit_pos < 0 && (digit_pos % mon_group) == 0)
{
/* insert thousands sep, but only to left of radix point */
bufptr -= strlen(ssymbol);
memcpy(bufptr, ssymbol, strlen(ssymbol));
}
*(--bufptr) = ((uint64) value % 10) + '0';
value = ((uint64) value) / 10;
digit_pos--;
} while (value || digit_pos >= 0);
/*----------
* Now, attach currency symbol and sign symbol in the correct order.
*
* The POSIX spec defines these values controlling this code:
*
* p/n_sign_posn:
* 0 Parentheses enclose the quantity and the currency_symbol.
* 1 The sign string precedes the quantity and the currency_symbol.
* 2 The sign string succeeds the quantity and the currency_symbol.
* 3 The sign string precedes the currency_symbol.
* 4 The sign string succeeds the currency_symbol.
*
* p/n_cs_precedes: 0 means currency symbol after value, else before it.
*
* p/n_sep_by_space:
* 0 No <space> separates the currency symbol and value.
* 1 If the currency symbol and sign string are adjacent, a <space>
* separates them from the value; otherwise, a <space> separates
* the currency symbol from the value.
* 2 If the currency symbol and sign string are adjacent, a <space>
* separates them; otherwise, a <space> separates the sign string
* from the value.
*----------
*/
switch (sign_posn)
{
case 0:
if (cs_precedes)
result = psprintf("(%s%s%s)",
csymbol,
(sep_by_space == 1) ? " " : "",
bufptr);
else
result = psprintf("(%s%s%s)",
bufptr,
(sep_by_space == 1) ? " " : "",
csymbol);
break;
case 1:
default:
if (cs_precedes)
result = psprintf("%s%s%s%s%s",
signsymbol,
(sep_by_space == 2) ? " " : "",
csymbol,
(sep_by_space == 1) ? " " : "",
bufptr);
else
result = psprintf("%s%s%s%s%s",
signsymbol,
(sep_by_space == 2) ? " " : "",
bufptr,
(sep_by_space == 1) ? " " : "",
csymbol);
break;
case 2:
if (cs_precedes)
result = psprintf("%s%s%s%s%s",
csymbol,
(sep_by_space == 1) ? " " : "",
bufptr,
(sep_by_space == 2) ? " " : "",
signsymbol);
else
result = psprintf("%s%s%s%s%s",
bufptr,
(sep_by_space == 1) ? " " : "",
csymbol,
(sep_by_space == 2) ? " " : "",
signsymbol);
break;
case 3:
if (cs_precedes)
result = psprintf("%s%s%s%s%s",
signsymbol,
(sep_by_space == 2) ? " " : "",
csymbol,
(sep_by_space == 1) ? " " : "",
bufptr);
else
result = psprintf("%s%s%s%s%s",
bufptr,
(sep_by_space == 1) ? " " : "",
signsymbol,
(sep_by_space == 2) ? " " : "",
csymbol);
break;
case 4:
if (cs_precedes)
result = psprintf("%s%s%s%s%s",
csymbol,
(sep_by_space == 2) ? " " : "",
signsymbol,
(sep_by_space == 1) ? " " : "",
bufptr);
else
result = psprintf("%s%s%s%s%s",
bufptr,
(sep_by_space == 1) ? " " : "",
csymbol,
(sep_by_space == 2) ? " " : "",
signsymbol);
break;
}
PG_RETURN_CSTRING(result);
}
/*
* cash_recv - converts external binary format to cash
*/
Datum
cash_recv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
PG_RETURN_CASH((Cash) pq_getmsgint64(buf));
}
/*
* cash_send - converts cash to binary format
*/
Datum
cash_send(PG_FUNCTION_ARGS)
{
Cash arg1 = PG_GETARG_CASH(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendint64(&buf, arg1);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* Comparison functions
*/
Datum
cash_eq(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
PG_RETURN_BOOL(c1 == c2);
}
Datum
cash_ne(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
PG_RETURN_BOOL(c1 != c2);
}
Datum
cash_lt(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
PG_RETURN_BOOL(c1 < c2);
}
Datum
cash_le(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
PG_RETURN_BOOL(c1 <= c2);
}
Datum
cash_gt(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
PG_RETURN_BOOL(c1 > c2);
}
Datum
cash_ge(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
PG_RETURN_BOOL(c1 >= c2);
}
Datum
cash_cmp(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
if (c1 > c2)
PG_RETURN_INT32(1);
else if (c1 == c2)
PG_RETURN_INT32(0);
else
PG_RETURN_INT32(-1);
}
/* cash_pl()
* Add two cash values.
*/
Datum
cash_pl(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
Cash result;
result = c1 + c2;
PG_RETURN_CASH(result);
}
/* cash_mi()
* Subtract two cash values.
*/
Datum
cash_mi(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
Cash result;
result = c1 - c2;
PG_RETURN_CASH(result);
}
/* cash_div_cash()
* Divide cash by cash, returning float8.
*/
Datum
cash_div_cash(PG_FUNCTION_ARGS)
{
Cash dividend = PG_GETARG_CASH(0);
Cash divisor = PG_GETARG_CASH(1);
float8 quotient;
if (divisor == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
quotient = (float8) dividend / (float8) divisor;
PG_RETURN_FLOAT8(quotient);
}
/* cash_mul_flt8()
* Multiply cash by float8.
*/
Datum
cash_mul_flt8(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
float8 f = PG_GETARG_FLOAT8(1);
Cash result;
result = rint(c * f);
PG_RETURN_CASH(result);
}
/* flt8_mul_cash()
* Multiply float8 by cash.
*/
Datum
flt8_mul_cash(PG_FUNCTION_ARGS)
{
float8 f = PG_GETARG_FLOAT8(0);
Cash c = PG_GETARG_CASH(1);
Cash result;
result = rint(f * c);
PG_RETURN_CASH(result);
}
/* cash_div_flt8()
* Divide cash by float8.
*/
Datum
cash_div_flt8(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
float8 f = PG_GETARG_FLOAT8(1);
Cash result;
if (f == 0.0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
result = rint(c / f);
PG_RETURN_CASH(result);
}
/* cash_mul_flt4()
* Multiply cash by float4.
*/
Datum
cash_mul_flt4(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
float4 f = PG_GETARG_FLOAT4(1);
Cash result;
result = rint(c * (float8) f);
PG_RETURN_CASH(result);
}
/* flt4_mul_cash()
* Multiply float4 by cash.
*/
Datum
flt4_mul_cash(PG_FUNCTION_ARGS)
{
float4 f = PG_GETARG_FLOAT4(0);
Cash c = PG_GETARG_CASH(1);
Cash result;
result = rint((float8) f * c);
PG_RETURN_CASH(result);
}
/* cash_div_flt4()
* Divide cash by float4.
*
*/
Datum
cash_div_flt4(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
float4 f = PG_GETARG_FLOAT4(1);
Cash result;
if (f == 0.0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
result = rint(c / (float8) f);
PG_RETURN_CASH(result);
}
/* cash_mul_int8()
* Multiply cash by int8.
*/
Datum
cash_mul_int8(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
int64 i = PG_GETARG_INT64(1);
Cash result;
result = c * i;
PG_RETURN_CASH(result);
}
/* int8_mul_cash()
* Multiply int8 by cash.
*/
Datum
int8_mul_cash(PG_FUNCTION_ARGS)
{
int64 i = PG_GETARG_INT64(0);
Cash c = PG_GETARG_CASH(1);
Cash result;
result = i * c;
PG_RETURN_CASH(result);
}
/* cash_div_int8()
* Divide cash by 8-byte integer.
*/
Datum
cash_div_int8(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
int64 i = PG_GETARG_INT64(1);
Cash result;
if (i == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
result = c / i;
PG_RETURN_CASH(result);
}
/* cash_mul_int4()
* Multiply cash by int4.
*/
Datum
cash_mul_int4(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
int32 i = PG_GETARG_INT32(1);
Cash result;
result = c * i;
PG_RETURN_CASH(result);
}
/* int4_mul_cash()
* Multiply int4 by cash.
*/
Datum
int4_mul_cash(PG_FUNCTION_ARGS)
{
int32 i = PG_GETARG_INT32(0);
Cash c = PG_GETARG_CASH(1);
Cash result;
result = i * c;
PG_RETURN_CASH(result);
}
/* cash_div_int4()
* Divide cash by 4-byte integer.
*
*/
Datum
cash_div_int4(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
int32 i = PG_GETARG_INT32(1);
Cash result;
if (i == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
result = c / i;
PG_RETURN_CASH(result);
}
/* cash_mul_int2()
* Multiply cash by int2.
*/
Datum
cash_mul_int2(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
int16 s = PG_GETARG_INT16(1);
Cash result;
result = c * s;
PG_RETURN_CASH(result);
}
/* int2_mul_cash()
* Multiply int2 by cash.
*/
Datum
int2_mul_cash(PG_FUNCTION_ARGS)
{
int16 s = PG_GETARG_INT16(0);
Cash c = PG_GETARG_CASH(1);
Cash result;
result = s * c;
PG_RETURN_CASH(result);
}
/* cash_div_int2()
* Divide cash by int2.
*
*/
Datum
cash_div_int2(PG_FUNCTION_ARGS)
{
Cash c = PG_GETARG_CASH(0);
int16 s = PG_GETARG_INT16(1);
Cash result;
if (s == 0)
ereport(ERROR,
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
result = c / s;
PG_RETURN_CASH(result);
}
/* cashlarger()
* Return larger of two cash values.
*/
Datum
cashlarger(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
Cash result;
result = (c1 > c2) ? c1 : c2;
PG_RETURN_CASH(result);
}
/* cashsmaller()
* Return smaller of two cash values.
*/
Datum
cashsmaller(PG_FUNCTION_ARGS)
{
Cash c1 = PG_GETARG_CASH(0);
Cash c2 = PG_GETARG_CASH(1);
Cash result;
result = (c1 < c2) ? c1 : c2;
PG_RETURN_CASH(result);
}
/* cash_words()
* This converts an int4 as well but to a representation using words
* Obviously way North American centric - sorry
*/
Datum
cash_words(PG_FUNCTION_ARGS)
{
Cash value = PG_GETARG_CASH(0);
uint64 val;
char buf[256];
char *p = buf;
Cash m0;
Cash m1;
Cash m2;
Cash m3;
Cash m4;
Cash m5;
Cash m6;
/* work with positive numbers */
if (value < 0)
{
value = -value;
strcpy(buf, "minus ");
p += 6;
}
else
buf[0] = '\0';
/* Now treat as unsigned, to avoid trouble at INT_MIN */
val = (uint64) value;
m0 = val % INT64CONST(100); /* cents */
m1 = (val / INT64CONST(100)) % 1000; /* hundreds */
m2 = (val / INT64CONST(100000)) % 1000; /* thousands */
m3 = (val / INT64CONST(100000000)) % 1000; /* millions */
m4 = (val / INT64CONST(100000000000)) % 1000; /* billions */
m5 = (val / INT64CONST(100000000000000)) % 1000; /* trillions */
m6 = (val / INT64CONST(100000000000000000)) % 1000; /* quadrillions */
if (m6)
{
strcat(buf, num_word(m6));
strcat(buf, " quadrillion ");
}
if (m5)
{
strcat(buf, num_word(m5));
strcat(buf, " trillion ");
}
if (m4)
{
strcat(buf, num_word(m4));
strcat(buf, " billion ");
}
if (m3)
{
strcat(buf, num_word(m3));
strcat(buf, " million ");
}
if (m2)
{
strcat(buf, num_word(m2));
strcat(buf, " thousand ");
}
if (m1)
strcat(buf, num_word(m1));
if (!*p)
strcat(buf, "zero");
strcat(buf, (val / 100) == 1 ? " dollar and " : " dollars and ");
strcat(buf, num_word(m0));
strcat(buf, m0 == 1 ? " cent" : " cents");
/* capitalize output */
buf[0] = pg_toupper((unsigned char) buf[0]);
/* return as text datum */
PG_RETURN_TEXT_P(cstring_to_text(buf));
}
/* cash_numeric()
* Convert cash to numeric.
*/
Datum
cash_numeric(PG_FUNCTION_ARGS)
{
Cash money = PG_GETARG_CASH(0);
Datum result;
int fpoint;
struct lconv *lconvert = PGLC_localeconv();
/* see comments about frac_digits in cash_in() */
fpoint = lconvert->frac_digits;
if (fpoint < 0 || fpoint > 10)
fpoint = 2;
/* convert the integral money value to numeric */
result = NumericGetDatum(int64_to_numeric(money));
/* scale appropriately, if needed */
if (fpoint > 0)
{
int64 scale;
int i;
Datum numeric_scale;
Datum quotient;
/* compute required scale factor */
scale = 1;
for (i = 0; i < fpoint; i++)
scale *= 10;
numeric_scale = NumericGetDatum(int64_to_numeric(scale));
/*
* Given integral inputs approaching INT64_MAX, select_div_scale()
* might choose a result scale of zero, causing loss of fractional
* digits in the quotient. We can ensure an exact result by setting
* the dscale of either input to be at least as large as the desired
* result scale. numeric_round() will do that for us.
*/
numeric_scale = DirectFunctionCall2(numeric_round,
numeric_scale,
Int32GetDatum(fpoint));
/* Now we can safely divide ... */
quotient = DirectFunctionCall2(numeric_div, result, numeric_scale);
/* ... and forcibly round to exactly the intended number of digits */
result = DirectFunctionCall2(numeric_round,
quotient,
Int32GetDatum(fpoint));
}
PG_RETURN_DATUM(result);
}
/* numeric_cash()
* Convert numeric to cash.
*/
Datum
numeric_cash(PG_FUNCTION_ARGS)
{
Datum amount = PG_GETARG_DATUM(0);
Cash result;
int fpoint;
int64 scale;
int i;
Datum numeric_scale;
struct lconv *lconvert = PGLC_localeconv();
/* see comments about frac_digits in cash_in() */
fpoint = lconvert->frac_digits;
if (fpoint < 0 || fpoint > 10)
fpoint = 2;
/* compute required scale factor */
scale = 1;
for (i = 0; i < fpoint; i++)
scale *= 10;
/* multiply the input amount by scale factor */
numeric_scale = NumericGetDatum(int64_to_numeric(scale));
amount = DirectFunctionCall2(numeric_mul, amount, numeric_scale);
/* note that numeric_int8 will round to nearest integer for us */
result = DatumGetInt64(DirectFunctionCall1(numeric_int8, amount));
PG_RETURN_CASH(result);
}
/* int4_cash()
* Convert int4 (int) to cash
*/
Datum
int4_cash(PG_FUNCTION_ARGS)
{
int32 amount = PG_GETARG_INT32(0);
Cash result;
int fpoint;
int64 scale;
int i;
struct lconv *lconvert = PGLC_localeconv();
/* see comments about frac_digits in cash_in() */
fpoint = lconvert->frac_digits;
if (fpoint < 0 || fpoint > 10)
fpoint = 2;
/* compute required scale factor */
scale = 1;
for (i = 0; i < fpoint; i++)
scale *= 10;
/* compute amount * scale, checking for overflow */
result = DatumGetInt64(DirectFunctionCall2(int8mul, Int64GetDatum(amount),
Int64GetDatum(scale)));
PG_RETURN_CASH(result);
}
/* int8_cash()
* Convert int8 (bigint) to cash
*/
Datum
int8_cash(PG_FUNCTION_ARGS)
{
int64 amount = PG_GETARG_INT64(0);
Cash result;
int fpoint;
int64 scale;
int i;
struct lconv *lconvert = PGLC_localeconv();
/* see comments about frac_digits in cash_in() */
fpoint = lconvert->frac_digits;
if (fpoint < 0 || fpoint > 10)
fpoint = 2;
/* compute required scale factor */
scale = 1;
for (i = 0; i < fpoint; i++)
scale *= 10;
/* compute amount * scale, checking for overflow */
result = DatumGetInt64(DirectFunctionCall2(int8mul, Int64GetDatum(amount),
Int64GetDatum(scale)));
PG_RETURN_CASH(result);
}
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