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-rw-r--r--contrib/isn/isn.c1132
-rw-r--r--contrib/isn/isn.control6
2 files changed, 1138 insertions, 0 deletions
diff --git a/contrib/isn/isn.c b/contrib/isn/isn.c
new file mode 100644
index 0000000..00bd9cd
--- /dev/null
+++ b/contrib/isn/isn.c
@@ -0,0 +1,1132 @@
+/*-------------------------------------------------------------------------
+ *
+ * isn.c
+ * PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
+ *
+ * Author: German Mendez Bravo (Kronuz)
+ * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ * contrib/isn/isn.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "EAN13.h"
+#include "ISBN.h"
+#include "ISMN.h"
+#include "ISSN.h"
+#include "UPC.h"
+#include "fmgr.h"
+#include "isn.h"
+#include "utils/builtins.h"
+
+PG_MODULE_MAGIC;
+
+#ifdef USE_ASSERT_CHECKING
+#define ISN_DEBUG 1
+#else
+#define ISN_DEBUG 0
+#endif
+
+#define MAXEAN13LEN 18
+
+enum isn_type
+{
+ INVALID, ANY, EAN13, ISBN, ISMN, ISSN, UPC
+};
+
+static const char *const isn_names[] = {"EAN13/UPC/ISxN", "EAN13/UPC/ISxN", "EAN13", "ISBN", "ISMN", "ISSN", "UPC"};
+
+static bool g_weak = false;
+
+
+/***********************************************************************
+ **
+ ** 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)
+ */
+pg_attribute_unused()
+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,
+ 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((unsigned char) *aux1) || !isdigit((unsigned char) *aux2))
+ goto invalidtable;
+ a = *aux1 - '0';
+ b = *aux2 - '0';
+
+ /* must always have the same format and length: */
+ while (*aux1 && *aux2)
+ {
+ if (!(isdigit((unsigned char) *aux1) &&
+ isdigit((unsigned char) *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;
+}
+
+/*----------------------------------------------------------
+ * Formatting and conversion routines.
+ *---------------------------------------------------------*/
+
+static unsigned
+dehyphenate(char *bufO, char *bufI)
+{
+ unsigned ret = 0;
+
+ while (*bufI)
+ {
+ if (isdigit((unsigned char) *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 actually 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((unsigned char) *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((unsigned char) *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((unsigned char) *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 *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;
+ 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) == 0)
+ { /* ISBN */
+ type = ISBN;
+ }
+ else if (strncmp("977", buf, 3) == 0)
+ { /* ISSN */
+ type = ISSN;
+ }
+ else if (strncmp("9790", buf, 4) == 0)
+ { /* ISMN */
+ type = ISMN;
+ }
+ else if (strncmp("979", buf, 3) == 0)
+ { /* 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 or may be an
+ * ISBN-13 number, 979-..., which does not have a short representation. Do
+ * the short output version if possible.
+ */
+ if (strncmp("978-", isn, 4) == 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((unsigned char) *--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((unsigned char) *num))
+ ean = 10 * ean + (*num - '0');
+ num++;
+ }
+ return (ean << 1); /* also give room to a flag */
+}
+
+/*
+ * ean2string --- Try to convert an ean13 number to a 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 *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;
+ 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) == 0)
+ { /* ISBN -13 978-range */
+ /* 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) == 0)
+ { /* 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) == 0)
+ { /* ISMN */
+ /* The string should be in this form: 979-0?000000000-0" */
+ type = ISMN;
+ TABLE = ISMN_range;
+ TABLE_index = ISMN_index;
+ }
+ else if (strncmp("979-", result, search) == 0)
+ { /* ISBN-13 979-range */
+ /* The string should be in this form: 979-??000000000-0" */
+ type = ISBN;
+ TABLE = ISBN_range_new;
+ TABLE_index = ISBN_index_new;
+ }
+ 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.
+ *
+ * ereturn false with a useful error message if the string is bad.
+ * Otherwise return true.
+ *
+ * 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, struct Node *escontext, 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((unsigned char) *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((unsigned char) *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((unsigned char) *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 suffix 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) == 0)
+ type = ISSN;
+ else if (strncmp("978", buf + 3, 3) == 0)
+ type = ISBN;
+ else if (strncmp("9790", buf + 3, 4) == 0)
+ type = ISMN;
+ else if (strncmp("979", buf + 3, 3) == 0)
+ type = ISBN;
+ if (accept != EAN13 && accept != ANY && type != accept)
+ goto eanwrongtype;
+ break;
+ case ISMN:
+ memcpy(buf, "9790", 4); /* this isn't for sure yet, for now ISMN
+ * it's only 9790 */
+ valid = (valid && ((rcheck = checkdig(buf, 13)) == check || magic));
+ break;
+ case ISBN:
+ memcpy(buf, "978", 3);
+ valid = (valid && ((rcheck = weight_checkdig(buf + 3, 10)) == check || magic));
+ break;
+ case ISSN:
+ memcpy(buf + 10, "00", 2); /* append 00 as the normal issue
+ * publication code */
+ memcpy(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 (rcheck == (unsigned) -1)
+ {
+ ereturn(escontext, false,
+ (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+ errmsg("invalid %s number: \"%s\"",
+ isn_names[accept], str)));
+ }
+ else
+ {
+ ereturn(escontext, false,
+ (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'))));
+ }
+
+eaninvalid:
+ ereturn(escontext, false,
+ (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+ errmsg("invalid input syntax for %s number: \"%s\"",
+ isn_names[accept], str)));
+
+eanwrongtype:
+ ereturn(escontext, false,
+ (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+ errmsg("cannot cast %s to %s for number: \"%s\"",
+ isn_names[type], isn_names[accept], str)));
+
+eantoobig:
+ ereturn(escontext, false,
+ (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
+ errmsg("value \"%s\" is out of range for %s type",
+ str, isn_names[accept])));
+}
+
+/*----------------------------------------------------------
+ * Exported routines.
+ *---------------------------------------------------------*/
+
+void
+_PG_init(void)
+{
+ if (ISN_DEBUG)
+ {
+ if (!check_table(EAN13_range, EAN13_index))
+ elog(ERROR, "EAN13 failed check");
+ if (!check_table(ISBN_range, ISBN_index))
+ elog(ERROR, "ISBN failed check");
+ if (!check_table(ISMN_range, ISMN_index))
+ elog(ERROR, "ISMN failed check");
+ if (!check_table(ISSN_range, ISSN_index))
+ elog(ERROR, "ISSN failed check");
+ if (!check_table(UPC_range, UPC_index))
+ elog(ERROR, "UPC failed check");
+ }
+}
+
+/* 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;
+
+ if (!string2ean(str, fcinfo->context, &result, EAN13))
+ PG_RETURN_NULL();
+ 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;
+
+ if (!string2ean(str, fcinfo->context, &result, ISBN))
+ PG_RETURN_NULL();
+ 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;
+
+ if (!string2ean(str, fcinfo->context, &result, ISMN))
+ PG_RETURN_NULL();
+ 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;
+
+ if (!string2ean(str, fcinfo->context, &result, ISSN))
+ PG_RETURN_NULL();
+ 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;
+
+ if (!string2ean(str, fcinfo->context, &result, UPC))
+ PG_RETURN_NULL();
+ PG_RETURN_EAN13(result);
+}
+
+/* casting functions
+*/
+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);
+}
+
+
+/* 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);
+}
+
+/* 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)
+{
+#ifdef ISN_WEAK_MODE
+ g_weak = PG_GETARG_BOOL(0);
+#else
+ /* function has no effect */
+#endif /* ISN_WEAK_MODE */
+ PG_RETURN_BOOL(g_weak);
+}
+
+PG_FUNCTION_INFO_V1(weak_input_status);
+Datum
+weak_input_status(PG_FUNCTION_ARGS)
+{
+ PG_RETURN_BOOL(g_weak);
+}
diff --git a/contrib/isn/isn.control b/contrib/isn/isn.control
new file mode 100644
index 0000000..1cb5e2b
--- /dev/null
+++ b/contrib/isn/isn.control
@@ -0,0 +1,6 @@
+# isn extension
+comment = 'data types for international product numbering standards'
+default_version = '1.2'
+module_pathname = '$libdir/isn'
+relocatable = true
+trusted = true
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 10:01:50 +0000