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5e08e49637
postgresql/contrib/isn/isn.c
Tom Lane 5e08e49637 contrib/isn updates from Jeremy Kronuz.
2006-09-10 20:45:17 +00:00

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/*-------------------------------------------------------------------------
*
* isn.c
* PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
*
* Copyright (c) 2004-2006, Germán Méndez Bravo (Kronuz)
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/contrib/isn/isn.c,v 1.2 2006/09/10 20:45:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "utils/builtins.h"
PG_MODULE_MAGIC;
#include "isn.h"
#include "EAN13.h"
#include "ISBN.h"
#include "ISMN.h"
#include "ISSN.h"
#include "UPC.h"
#define MAXEAN13LEN 18
enum isn_type { INVALID, ANY, EAN13, ISBN, ISMN, ISSN, UPC };
static const char *isn_names[] = { "EAN13/UPC/ISxN", "EAN13/UPC/ISxN", "EAN13", "ISBN", "ISMN", "ISSN", "UPC" };
static bool g_weak = false;
static bool g_initialized = false;
/* Macros for converting TEXT to and from c-string */
#define GET_TEXT(cstrp) DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(cstrp)))
#define GET_STR(textp) DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp)))
/***********************************************************************
**
** Routines for EAN13/UPC/ISxNs.
**
** Note:
** In this code, a normalized string is one that is known to be a valid
** ISxN number containing only digits and hyphens and with enough space
** to hold the full 13 digits plus the maximum of four hyphens.
***********************************************************************/
/*----------------------------------------------------------
* Debugging routines.
*---------------------------------------------------------*/
/*
* Check if the table and its index is correct (just for debugging)
*/
#ifdef ISN_DEBUG
static
bool check_table(const char *(*TABLE)[2], const unsigned TABLE_index[10][2])
{
const char *aux1, *aux2;
int a, b, x=0, y=-1, i=0, j, cnt=0, init=0;
if(TABLE == NULL || TABLE_index == NULL) return true;
while(TABLE[i][0] && TABLE[i][1]) {
aux1 = TABLE[i][0];
aux2 = TABLE[i][1];
/* must always start with a digit: */
if(!isdigit(*aux1) || !isdigit(*aux2)) goto invalidtable;
a = *aux1 - '0';
b = *aux2 - '0';
/* must always have the same format and length: */
while(*aux1 && *aux2) {
if(!(isdigit(*aux1) && isdigit(*aux2)) && (*aux1!=*aux2 || *aux1 != '-'))
goto invalidtable;
aux1++;
aux2++;
}
if(*aux1!=*aux2) goto invalidtable;
/* found a new range */
if(a>y) {
/* check current range in the index: */
for(j=x;j<=y;j++) {
if(TABLE_index[j][0] != init) goto invalidindex;
if(TABLE_index[j][1] != i-init) goto invalidindex;
}
init = i;
x = a;
}
/* Always get the new limit */
y = b;
if(y<x) goto invalidtable;
i++;
}
return true;
invalidtable:
elog(DEBUG1, "invalid table near {\"%s\", \"%s\"} (pos: %d)",
TABLE[i][0], TABLE[i][1], i);
return false;
invalidindex:
elog(DEBUG1, "index %d is invalid", j);
return false;
}
#endif /* ISN_DEBUG */
/*----------------------------------------------------------
* Formatting and conversion routines.
*---------------------------------------------------------*/
static
unsigned dehyphenate(char *bufO, char *bufI)
{
unsigned ret = 0;
while(*bufI) {
if(isdigit(*bufI)) {
*bufO++ = *bufI;
ret++;
}
bufI++;
}
*bufO = '\0';
return ret;
}
/*
* hyphenate --- Try to hyphenate, in-place, the string starting at bufI
* into bufO using the given hyphenation range TABLE.
* Assumes the input string to be used is of only digits.
*
* Returns the number of characters acctually hyphenated.
*/
static
unsigned hyphenate(char *bufO, char *bufI, const char *(*TABLE)[2], const unsigned TABLE_index[10][2])
{
unsigned ret = 0;
const char *ean_aux1, *ean_aux2, *ean_p;
char *firstdig, *aux1, *aux2;
unsigned search, upper, lower, step;
bool ean_in1, ean_in2;
/* just compress the string if no further hyphenation is required */
if(TABLE == NULL || TABLE_index == NULL) {
while(*bufI) {
*bufO++ = *bufI++;
ret++;
}
*bufO = '\0';
return (ret+1);
}
/* add remaining hyphenations */
search = *bufI - '0';
upper = lower = TABLE_index[search][0];
upper += TABLE_index[search][1];
lower--;
step = (upper - lower) / 2;
if(step == 0) return 0;
search = lower + step;
firstdig = bufI;
ean_in1 = ean_in2 = false;
ean_aux1 = TABLE[search][0];
ean_aux2 = TABLE[search][1];
do {
if((ean_in1 || *firstdig>=*ean_aux1) && (ean_in2 || *firstdig<=*ean_aux2)) {
if(*firstdig > *ean_aux1) ean_in1 = true;
if(*firstdig < *ean_aux2) ean_in2 = true;
if(ean_in1 && ean_in2) break;
firstdig++, ean_aux1++, ean_aux2++;
if(!(*ean_aux1 && *ean_aux2 && *firstdig)) break;
if(!isdigit(*ean_aux1)) ean_aux1++, ean_aux2++;
} else {
/* check in what direction we should go and move the pointer accordingly */
if(*firstdig < *ean_aux1 && !ean_in1) upper = search;
else lower = search;
step = (upper - lower) / 2;
search = lower + step;
/* Initialize stuff again: */
firstdig = bufI;
ean_in1 = ean_in2 = false;
ean_aux1 = TABLE[search][0];
ean_aux2 = TABLE[search][1];
}
} while(step);
if(step) {
aux1 = bufO;
aux2 = bufI;
ean_p = TABLE[search][0];
while(*ean_p && *aux2) {
if(*ean_p++!='-') *aux1++ = *aux2++;
else *aux1++ = '-';
ret++;
}
*aux1++='-';
*aux1 = *aux2; /* add a lookahead char */
return (ret+1);
}
return ret;
}
/*
* weight_checkdig -- Receives a buffer with a normalized ISxN string number,
* and the length to weight.
*
* Returns the weight of the number (the check digit value, 0-10)
*/
static
unsigned weight_checkdig(char *isn, unsigned size)
{
unsigned weight = 0;
while(*isn && size>1) {
if(isdigit(*isn)) {
weight += size-- * (*isn - '0');
}
isn++;
}
weight = weight % 11;
if(weight != 0) weight = 11 - weight;
return weight;
}
/*
* checkdig --- Receives a buffer with a normalized ISxN string number,
* and the length to check.
*
* Returns the check digit value (0-9)
*/
static
unsigned checkdig(char *num, unsigned size)
{
unsigned check=0, check3=0;
unsigned pos = 0;
if(*num == 'M') { /* ISMN start with 'M' */
check3 = 3;
pos = 1;
}
while(*num && size>1) {
if(isdigit(*num)) {
if(pos++%2) check3 += *num - '0';
else check += *num - '0';
size--;
}
num++;
}
check = (check + 3*check3) % 10;
if(check != 0) check = 10 - check;
return check;
}
/*
* ean2isn --- Try to convert an ean13 number to a UPC/ISxN number.
* This doesn't verify for a valid check digit.
*
* If errorOK is false, ereport a useful error message if the ean13 is bad.
* If errorOK is true, just return "false" for bad input.
*/
static
bool ean2isn(ean13 ean, bool errorOK, ean13 *result, enum isn_type accept)
{
enum isn_type type = INVALID;
char buf[MAXEAN13LEN + 1];
char *firstdig, *aux;
unsigned digval;
unsigned search;
ean13 ret = ean;
ean >>= 1;
/* verify it's in the EAN13 range */
if(ean > UINT64CONST(9999999999999))
goto eantoobig;
/* convert the number */
search = 0;
firstdig = aux = buf + 13;
*aux = '\0'; /* terminate string; aux points to last digit */
do {
digval = (unsigned)(ean % 10); /* get the decimal value */
ean /= 10; /* get next digit */
*--aux = (char)(digval + '0'); /* convert to ascii and store */
} while(ean && search++<12);
while(search++<12) *--aux = '0'; /* fill the remaining EAN13 with '0' */
/* find out the data type: */
if(!strncmp("978", buf, 3)) { /* ISBN */
type = ISBN;
} else if(!strncmp("977", buf, 3)) { /* ISSN */
type = ISSN;
} else if(!strncmp("9790", buf, 4)) { /* ISMN */
type = ISMN;
} else if(!strncmp("979", buf, 3)) { /* ISBN-13 */
type = ISBN;
} else if(*buf == '0') { /* UPC */
type = UPC;
} else {
type = EAN13;
}
if(accept != ANY && accept != EAN13 && accept != type) goto eanwrongtype;
*result = ret;
return true;
eanwrongtype:
if(!errorOK) {
if(type!=EAN13) {
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("cannot cast EAN13(%s) to %s for number: \"%s\"",
isn_names[type], isn_names[accept], buf)));
} else {
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("cannot cast %s to %s for number: \"%s\"",
isn_names[type], isn_names[accept], buf)));
}
}
return false;
eantoobig:
if(!errorOK) {
char eanbuf[64];
/*
* Format the number separately to keep the machine-dependent
* format code out of the translatable message text
*/
snprintf(eanbuf, sizeof(eanbuf), EAN13_FORMAT, ean);
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("value \"%s\" is out of range for %s type",
eanbuf, isn_names[type])));
}
return false;
}
/*
* ean2UPC/ISxN --- Convert in-place a normalized EAN13 string to the corresponding
* UPC/ISxN string number. Assumes the input string is normalized.
*/
static inline
void ean2ISBN(char *isn)
{
char *aux;
unsigned check;
/* the number should come in this format: 978-0-000-00000-0 */
/* Strip the first part and calculate the new check digit */
hyphenate(isn, isn+4, NULL, NULL);
check = weight_checkdig(isn, 10);
aux = strchr(isn, '\0');
while(!isdigit(*--aux));
if(check == 10) *aux = 'X';
else *aux = check + '0';
}
static inline
void ean2ISMN(char *isn)
{
/* the number should come in this format: 979-0-000-00000-0 */
/* Just strip the first part and change the first digit ('0') to 'M' */
hyphenate(isn, isn+4, NULL, NULL);
isn[0] = 'M';
}
static inline
void ean2ISSN(char *isn)
{
unsigned check;
/* the number should come in this format: 977-0000-000-00-0 */
/* Strip the first part, crop, and calculate the new check digit */
hyphenate(isn, isn+4, NULL, NULL);
check = weight_checkdig(isn, 8);
if(check == 10) isn[8] = 'X';
else isn[8] = check + '0';
isn[9] = '\0';
}
static inline
void ean2UPC(char *isn)
{
/* the number should come in this format: 000-000000000-0 */
/* Strip the first part, crop, and dehyphenate */
dehyphenate(isn, isn+1);
isn[12] = '\0';
}
/*
* ean2* --- Converts a string of digits into an ean13 number.
* Assumes the input string is a string with only digits
* on it, and that it's within the range of ean13.
*
* Returns the ean13 value of the string.
*/
static
ean13 str2ean(const char *num)
{
ean13 ean = 0; /* current ean */
while(*num) {
if(isdigit(*num)) ean = 10 * ean + (*num - '0');
num++;
}
return (ean<<1); /* also give room to a flag */
}
/*
* ean2string --- Try to convert an ean13 number to an hyphenated string.
* Assumes there's enough space in result to hold
* the string (maximum MAXEAN13LEN+1 bytes)
* This doesn't verify for a valid check digit.
*
* If shortType is true, the returned string is in the old ISxN short format.
* If errorOK is false, ereport a useful error message if the string is bad.
* If errorOK is true, just return "false" for bad input.
*/
static
bool ean2string(ean13 ean, bool errorOK, char *result, bool shortType)
{
const char *(*TABLE)[2];
const unsigned (*TABLE_index)[2];
enum isn_type type = INVALID;
char *firstdig, *aux;
unsigned digval;
unsigned search;
char valid = '\0'; /* was the number initially written with a valid check digit? */
TABLE_index = ISBN_index;
if((ean & 1)!=0) valid = '!';
ean >>= 1;
/* verify it's in the EAN13 range */
if(ean > UINT64CONST(9999999999999))
goto eantoobig;
/* convert the number */
search = 0;
firstdig = aux = result + MAXEAN13LEN;
*aux = '\0'; /* terminate string; aux points to last digit */
*--aux = valid; /* append '!' for numbers with invalid but corrected check digit */
do {
digval = (unsigned)(ean % 10); /* get the decimal value */
ean /= 10; /* get next digit */
*--aux = (char)(digval + '0'); /* convert to ascii and store */
if(search == 0) *--aux = '-'; /* the check digit is always there */
} while(ean && search++<13);
while(search++<13) *--aux = '0'; /* fill the remaining EAN13 with '0' */
/* The string should be in this form: ???DDDDDDDDDDDD-D" */
search = hyphenate(result, result+3, EAN13_range, EAN13_index);
/* verify it's a logically valid EAN13 */
if(search == 0) {
search = hyphenate(result, result+3, NULL, NULL);
goto okay;
}
/* find out what type of hyphenation is needed: */
if(!strncmp("978-", result, search)) { /* ISBN */
/* The string should be in this form: 978-??000000000-0" */
type = ISBN;
TABLE = ISBN_range;
TABLE_index = ISBN_index;
} else if(!strncmp("977-", result, search)) { /* ISSN */
/* The string should be in this form: 977-??000000000-0" */
type = ISSN;
TABLE = ISSN_range;
TABLE_index = ISSN_index;
} else if(!strncmp("979-0", result, search+1)) { /* ISMN */
/* The string should be in this form: 979-0?000000000-0" */
type = ISMN;
TABLE = ISMN_range;
TABLE_index = ISMN_index;
} else if(*result == '0') { /* UPC */
/* The string should be in this form: 000-00000000000-0" */
type = UPC;
TABLE = UPC_range;
TABLE_index = UPC_index;
} else {
type = EAN13;
TABLE = NULL;
TABLE_index = NULL;
}
/* verify it's a logically valid EAN13/UPC/ISxN */
digval = search;
search = hyphenate(result+digval, result+digval+2, TABLE, TABLE_index);
/* verify it's a valid EAN13 */
if(search == 0) {
search = hyphenate(result+digval, result+digval+2, NULL, NULL);
goto okay;
}
okay:
/* convert to the old short type: */
if(shortType)
switch(type) {
case ISBN:
ean2ISBN(result);
break;
case ISMN:
ean2ISMN(result);
break;
case ISSN:
ean2ISSN(result);
break;
case UPC:
ean2UPC(result);
break;
default:
break;
}
return true;
eantoobig:
if(!errorOK)
{
char eanbuf[64];
/*
* Format the number separately to keep the machine-dependent
* format code out of the translatable message text
*/
snprintf(eanbuf, sizeof(eanbuf), EAN13_FORMAT, ean);
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("value \"%s\" is out of range for %s type",
eanbuf, isn_names[type])));
}
return false;
}
/*
* string2ean --- try to parse a string into an ean13.
*
* If errorOK is false, ereport a useful error message if the string is bad.
* If errorOK is true, just return "false" for bad input.
*
* if the input string ends with '!' it will always be treated as invalid
* (even if the check digit is valid)
*/
static
bool string2ean(const char *str, bool errorOK, ean13 *result,
enum isn_type accept)
{
bool digit, last;
char buf[17] = " ";
char *aux1 = buf + 3; /* leave space for the first part, in case it's needed */
const char *aux2 = str;
enum isn_type type = INVALID;
unsigned check = 0, rcheck = (unsigned)-1;
unsigned length = 0;
bool magic = false, valid = true;
/* recognize and validate the number: */
while(*aux2 && length <= 13) {
last = (*(aux2+1) == '!' || *(aux2+1) == '\0'); /* is the last character */
digit = (isdigit(*aux2)!=0); /* is current character a digit? */
if(*aux2=='?' && last) /* automagically calculate check digit if it's '?' */
magic = digit = true;
if(length == 0 && (*aux2=='M' || *aux2=='m')) {
/* only ISMN can be here */
if(type != INVALID) goto eaninvalid;
type = ISMN;
*aux1++ = 'M';
length++;
} else if(length == 7 && (digit || *aux2=='X' || *aux2=='x') && last) {
/* only ISSN can be here */
if(type != INVALID) goto eaninvalid;
type = ISSN;
*aux1++ = toupper(*aux2);
length++;
} else if(length == 9 && (digit || *aux2=='X' || *aux2=='x') && last) {
/* only ISBN and ISMN can be here */
if(type != INVALID && type != ISMN) goto eaninvalid;
if(type == INVALID) type = ISBN; /* ISMN must start with 'M' */
*aux1++ = toupper(*aux2);
length++;
} else if(length == 11 && digit && last) {
/* only UPC can be here */
if(type != INVALID) goto eaninvalid;
type = UPC;
*aux1++ = *aux2;
length++;
} else if(*aux2 == '-' || *aux2 == ' ') {
/* skip, we could validate but I think it's worthless */
} else if(*aux2 == '!' && *(aux2+1) == '\0') {
/* the invalid check digit sufix was found, set it */
if(!magic) valid = false;
magic = true;
} else if(!digit) {
goto eaninvalid;
} else {
*aux1++ = *aux2;
if(++length > 13) goto eantoobig;
}
aux2++;
}
*aux1 = '\0'; /* terminate the string */
/* find the current check digit value */
if(length == 13) {
/* only EAN13 can be here */
if(type != INVALID) goto eaninvalid;
type = EAN13;
check = buf[15]-'0';
} else if(length == 12) {
/* only UPC can be here */
if(type != UPC) goto eaninvalid;
check = buf[14]-'0';
} else if(length == 10) {
if(type != ISBN && type != ISMN) goto eaninvalid;
if(buf[12] == 'X') check = 10;
else check = buf[12]-'0';
} else if(length == 8) {
if(type != INVALID && type != ISSN) goto eaninvalid;
type = ISSN;
if(buf[10] == 'X') check = 10;
else check = buf[10]-'0';
} else goto eaninvalid;
if(type == INVALID) goto eaninvalid;
/* obtain the real check digit value, validate, and convert to ean13: */
if(accept == EAN13 && type != accept) goto eanwrongtype;
if(accept != ANY && type != EAN13 && type != accept) goto eanwrongtype;
switch(type) {
case EAN13:
valid = (valid && ((rcheck=checkdig(buf+3, 13)) == check || magic));
/* now get the subtype of EAN13: */
if(buf[3] == '0') type = UPC;
else if(!strncmp("977", buf+3, 3)) type = ISSN;
else if(!strncmp("978", buf+3, 3)) type = ISBN;
else if(!strncmp("9790", buf+3, 4)) type = ISMN;
else if(!strncmp("979", buf+3, 3)) type = ISBN;
if(accept != EAN13 && accept != ANY && type != accept) goto eanwrongtype;
break;
case ISMN:
strncpy(buf, "9790", 4); /* this isn't for sure yet, for now ISMN it's only 9790 */
valid = (valid && ((rcheck=checkdig(buf+3, 10)) == check || magic));
break;
case ISBN:
strncpy(buf, "978", 3);
valid = (valid && ((rcheck=weight_checkdig(buf+3, 10)) == check || magic));
break;
case ISSN:
strncpy(buf+10, "00", 2); /* append 00 as the normal issue publication code */
strncpy(buf, "977", 3);
valid = (valid && ((rcheck=weight_checkdig(buf+3, 8)) == check || magic));
break;
case UPC:
buf[2] = '0';
valid = (valid && ((rcheck=checkdig(buf+2, 13)) == check || magic));
default:
break;
}
/* fix the check digit: */
for(aux1 = buf; *aux1 && *aux1 <= ' '; aux1++);
aux1[12] = checkdig(aux1, 13) + '0';
aux1[13] = '\0';
if(!valid && !magic) goto eanbadcheck;
*result = str2ean(aux1);
*result |= valid?0:1;
return true;
eanbadcheck:
if(g_weak) { /* weak input mode is activated: */
/* set the "invalid-check-digit-on-input" flag */
*result = str2ean(aux1);
*result |= 1;
return true;
}
if(!errorOK) {
if(rcheck == (unsigned)-1) {
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid %s number: \"%s\"",
isn_names[accept], str)));
} else {
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid check digit for %s number: \"%s\", should be %c",
isn_names[accept], str, (rcheck==10)?('X'):(rcheck+'0'))));
}
}
return false;
eaninvalid:
if(!errorOK)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for %s number: \"%s\"",
isn_names[accept], str)));
return false;
eanwrongtype:
if(!errorOK)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("cannot cast %s to %s for number: \"%s\"",
isn_names[type], isn_names[accept], str)));
return false;
eantoobig:
if(!errorOK)
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("value \"%s\" is out of range for %s type",
str, isn_names[accept])));
return false;
}
/*----------------------------------------------------------
* Exported routines.
*---------------------------------------------------------*/
void initialize(void)
{
#ifdef ISN_DEBUG
if(!check_table(EAN13, EAN13_index))
elog(LOG, "EAN13 failed check");
if(!check_table(ISBN, ISBN_index))
elog(LOG, "ISBN failed check");
if(!check_table(ISMN, ISMN_index))
elog(LOG, "ISMN failed check");
if(!check_table(ISSN, ISSN_index))
elog(LOG, "ISSN failed check");
if(!check_table(UPC, UPC_index))
elog(LOG, "UPC failed check");
#endif
g_initialized = true;
}
/* isn_out
*/
PG_FUNCTION_INFO_V1(isn_out);
Datum
isn_out(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
char *result;
char buf[MAXEAN13LEN + 1];
(void) ean2string(val, false, buf, true);
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}
/* ean13_out
*/
PG_FUNCTION_INFO_V1(ean13_out);
Datum
ean13_out(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
char *result;
char buf[MAXEAN13LEN + 1];
(void) ean2string(val, false, buf, false);
result = pstrdup(buf);
PG_RETURN_CSTRING(result);
}
/* ean13_in
*/
PG_FUNCTION_INFO_V1(ean13_in);
Datum
ean13_in(PG_FUNCTION_ARGS)
{
const char *str = PG_GETARG_CSTRING(0);
ean13 result;
(void) string2ean(str, false, &result, EAN13);
PG_RETURN_EAN13(result);
}
/* isbn_in
*/
PG_FUNCTION_INFO_V1(isbn_in);
Datum
isbn_in(PG_FUNCTION_ARGS)
{
const char *str = PG_GETARG_CSTRING(0);
ean13 result;
(void) string2ean(str, false, &result, ISBN);
PG_RETURN_EAN13(result);
}
/* ismn_in
*/
PG_FUNCTION_INFO_V1(ismn_in);
Datum
ismn_in(PG_FUNCTION_ARGS)
{
const char *str = PG_GETARG_CSTRING(0);
ean13 result;
(void) string2ean(str, false, &result, ISMN);
PG_RETURN_EAN13(result);
}
/* issn_in
*/
PG_FUNCTION_INFO_V1(issn_in);
Datum
issn_in(PG_FUNCTION_ARGS)
{
const char *str = PG_GETARG_CSTRING(0);
ean13 result;
(void) string2ean(str, false, &result, ISSN);
PG_RETURN_EAN13(result);
}
/* upc_in
*/
PG_FUNCTION_INFO_V1(upc_in);
Datum
upc_in(PG_FUNCTION_ARGS)
{
const char *str = PG_GETARG_CSTRING(0);
ean13 result;
(void) string2ean(str, false, &result, UPC);
PG_RETURN_EAN13(result);
}
/* casting functions
*/
PG_FUNCTION_INFO_V1(ean13_cast_to_text);
Datum
ean13_cast_to_text(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
char buf[MAXEAN13LEN + 1];
(void) ean2string(val, false, buf, false);
PG_RETURN_TEXT_P(GET_TEXT(buf));
}
PG_FUNCTION_INFO_V1(isn_cast_to_text);
Datum
isn_cast_to_text(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
char buf[MAXEAN13LEN + 1];
(void) ean2string(val, false, buf, true);
PG_RETURN_TEXT_P(GET_TEXT(buf));
}
PG_FUNCTION_INFO_V1(isbn_cast_from_ean13);
Datum
isbn_cast_from_ean13(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
ean13 result;
(void) ean2isn(val, false, &result, ISBN);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(ismn_cast_from_ean13);
Datum
ismn_cast_from_ean13(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
ean13 result;
(void) ean2isn(val, false, &result, ISMN);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(issn_cast_from_ean13);
Datum
issn_cast_from_ean13(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
ean13 result;
(void) ean2isn(val, false, &result, ISSN);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(upc_cast_from_ean13);
Datum
upc_cast_from_ean13(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
ean13 result;
(void) ean2isn(val, false, &result, UPC);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(ean13_cast_from_text);
Datum
ean13_cast_from_text(PG_FUNCTION_ARGS)
{
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
ean13 result;
(void) string2ean(str, false, &result, EAN13);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(isbn_cast_from_text);
Datum
isbn_cast_from_text(PG_FUNCTION_ARGS)
{
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
ean13 result;
(void) string2ean(str, false, &result, ISBN);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(ismn_cast_from_text);
Datum
ismn_cast_from_text(PG_FUNCTION_ARGS)
{
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
ean13 result;
(void) string2ean(str, false, &result, ISMN);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(issn_cast_from_text);
Datum
issn_cast_from_text(PG_FUNCTION_ARGS)
{
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
ean13 result;
(void) string2ean(str, false, &result, ISSN);
PG_RETURN_EAN13(result);
}
PG_FUNCTION_INFO_V1(upc_cast_from_text);
Datum
upc_cast_from_text(PG_FUNCTION_ARGS)
{
const char *str = GET_STR(PG_GETARG_TEXT_P(0));
ean13 result;
(void) string2ean(str, false, &result, UPC);
PG_RETURN_EAN13(result);
}
/* is_valid - returns false if the "invalid-check-digit-on-input" is set
*/
PG_FUNCTION_INFO_V1(is_valid);
Datum
is_valid(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
PG_RETURN_BOOL((val & 1) == 0);
}
/* make_valid - unsets the "invalid-check-digit-on-input" flag
*/
PG_FUNCTION_INFO_V1(make_valid);
Datum
make_valid(PG_FUNCTION_ARGS)
{
ean13 val = PG_GETARG_EAN13(0);
val &= ~((ean13) 1);
PG_RETURN_EAN13(val);
}
#ifdef ISN_WEAK_MODE
/* this function temporarily sets weak input flag
* (to lose the strictness of check digit acceptance)
* It's a helper function, not intended to be used!!
*/
PG_FUNCTION_INFO_V1(accept_weak_input);
Datum
accept_weak_input(PG_FUNCTION_ARGS)
{
g_weak = PG_GETARG_BOOL(0);
PG_RETURN_BOOL(g_weak);
}
#else
PG_FUNCTION_INFO_V1(accept_weak_input);
Datum
accept_weak_input(PG_FUNCTION_ARGS)
{
/* function has no effect */
PG_RETURN_BOOL(false);
}
#endif /* ISN_WEAK_MODE */
PG_FUNCTION_INFO_V1(weak_input_status);
Datum
weak_input_status(PG_FUNCTION_ARGS)
{
PG_RETURN_BOOL(g_weak);
}
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