mirror of https://github.com/postgres/postgres
Augment the function call map logic with code from Tom Lane.
Should be more robust to overflows. Pass through an unmapped function unchanged, rather than rejecting it. Add a few more functions, but comment out those which can go through as-is. Can be used with contrib/odbc/ package, though that isn't committed yet.
This commit is contained in:
Thomas G. Lockhart
parent
51cfdae50f
commit
8cdabf0741
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@ -58,18 +58,75 @@ typedef signed char SCHAR;
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extern GLOBAL_VALUES globals;
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/* How to map ODBC scalar functions {fn func(args)} to Postgres */
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/* This is just a simple substitution */
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/* How to map ODBC scalar functions {fn func(args)} to Postgres
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* This is just a simple substitution
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* List augmented from
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* http://www.merant.com/datadirect/download/docs/odbc16/Odbcref/rappc.htm
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* - thomas 2000-04-03
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*/
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char *mapFuncs[][2] = {
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// { "ASCII", "ascii" },
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{ "CHAR", "ichar" },
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{ "CONCAT", "textcat" },
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// { "DIFFERENCE", "difference" },
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// { "INSERT", "insert" },
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{ "LCASE", "lower" },
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{ "LEFT", "ltrunc" },
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{ "LOCATE", "strpos" },
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{ "LENGTH", "textlen" },
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{ "LTRIM", "ltrim" },
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{ "RTRIM", "rtrim" },
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{ "LENGTH", "char_length"},
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// { "LTRIM", "ltrim" },
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{ "RIGHT", "rtrunc" },
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// { "REPEAT", "repeat" },
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// { "REPLACE", "replace" },
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// { "RTRIM", "rtrim" },
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// { "SOUNDEX", "soundex" },
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{ "SUBSTRING", "substr" },
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{ "UCASE", "upper" },
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{ "NOW", "now" },
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// { "ABS", "abs" },
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// { "ACOS", "acos" },
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// { "ASIN", "asin" },
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// { "ATAN", "atan" },
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// { "ATAN2", "atan2" },
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{ "CEILING", "ceil" },
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// { "COS", "cos" },
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// { "COT", "cot" },
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// { "DEGREES", "degrees" },
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// { "EXP", "exp" },
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// { "FLOOR", "floor" },
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{ "LOG", "ln" },
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{ "LOG10", "log" },
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// { "MOD", "mod" },
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// { "PI", "pi" },
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{ "POWER", "pow" },
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// { "RADIANS", "radians" },
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{ "RAND", "random" },
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// { "ROUND", "round" },
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// { "SIGN", "sign" },
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// { "SIN", "sin" },
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// { "SQRT", "sqrt" },
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// { "TAN", "tan" },
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// { "TRUNCATE", "truncate" },
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// { "CURDATE", "curdate" },
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// { "CURTIME", "curtime" },
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// { "DAYNAME", "dayname" },
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// { "DAYOFMONTH", "dayofmonth" },
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// { "DAYOFWEEK", "dayofweek" },
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// { "DAYOFYEAR", "dayofyear" },
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// { "HOUR", "hour" },
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// { "MINUTE", "minute" },
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// { "MONTH", "month" },
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// { "MONTHNAME", "monthname" },
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// { "NOW", "now" },
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// { "QUARTER", "quarter" },
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// { "SECOND", "second" },
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// { "WEEK", "week" },
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// { "YEAR", "year" },
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// { "DATABASE", "database" },
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{ "IFNULL", "coalesce" },
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{ "USER", "odbc_user" },
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{ 0, 0 }
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};
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@ -584,7 +641,7 @@ int
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copy_statement_with_parameters(StatementClass *stmt)
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{
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static char *func="copy_statement_with_parameters";
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unsigned int opos, npos;
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unsigned int opos, npos, oldstmtlen;
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char param_string[128], tmp[256], cbuf[TEXT_FIELD_SIZE+5];
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int param_number;
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Int2 param_ctype, param_sqltype;
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@ -629,14 +686,17 @@ int lobj_fd, retval;
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param_number = -1;
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for (opos = 0; opos < strlen(old_statement); opos++) {
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oldstmtlen = strlen(old_statement);
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for (opos = 0; opos < oldstmtlen; opos++) {
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// Squeeze carriage-returns/linfeed pairs to linefeed only
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if (old_statement[opos] == '\r' && opos+1<strlen(old_statement) && old_statement[opos+1] == '\n') {
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if (old_statement[opos] == '\r' && opos+1 < oldstmtlen &&
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old_statement[opos+1] == '\n') {
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continue;
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}
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// Handle literals (date, time, timestamp)
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// Handle literals (date, time, timestamp) and ODBC scalar functions
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else if (old_statement[opos] == '{') {
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char *esc;
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char *begin = &old_statement[opos + 1];
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@ -1056,37 +1116,69 @@ int i;
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return NULL;
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}
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// This function returns a pointer to static memory!
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/* convert_escape()
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* This function returns a pointer to static memory!
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*/
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char *
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convert_escape(char *value)
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{
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char key[32], val[256];
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static char escape[1024];
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char func[32], the_rest[1024];
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char *mapFunc;
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char key[33];
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sscanf(value, "%s %[^\r]", key, val);
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/* Separate off the key, skipping leading and trailing whitespace */
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while ((*value != '\0') && isspace(*value)) value++;
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sscanf(value, "%32s", key);
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while ((*value != '\0') && (! isspace(*value))) value++;
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while ((*value != '\0') && isspace(*value)) value++;
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mylog("convert_escape: key='%s', val='%s'\n", key, val);
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mylog("convert_escape: key='%s', val='%s'\n", key, value);
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if ( ! strcmp(key, "d") ||
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! strcmp(key, "t") ||
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! strcmp(key, "ts")) {
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strcpy(escape, val);
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if ( (strcmp(key, "d") == 0) ||
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(strcmp(key, "t") == 0) ||
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(strcmp(key, "ts") == 0)) {
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/* Literal; return the escape part as-is */
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strncpy(escape, value, sizeof(escape)-1);
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}
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else if ( ! strcmp(key, "fn")) {
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sscanf(val, "%[^(]%[^\r]", func, the_rest);
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mapFunc = mapFunction(func);
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if ( ! mapFunc)
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return NULL;
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else {
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else if (strcmp(key, "fn") == 0) {
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/* Function invocation
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* Separate off the func name,
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* skipping trailing whitespace.
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*/
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char *funcEnd = value;
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char svchar;
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char *mapFunc;
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while ((*funcEnd != '\0') && (*funcEnd != '(') &&
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(! isspace(*funcEnd))) funcEnd++;
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svchar = *funcEnd;
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*funcEnd = '\0';
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sscanf(value, "%32s", key);
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*funcEnd = svchar;
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while ((*funcEnd != '\0') && isspace(*funcEnd)) funcEnd++;
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/* We expect left parenthensis here,
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* else return fn body as-is since it is
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* one of those "function constants".
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*/
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if (*funcEnd != '(') {
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strncpy(escape, value, sizeof(escape)-1);
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return escape;
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}
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mapFunc = mapFunction(key);
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/* We could have mapFunction() return key if not in table...
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* - thomas 2000-04-03
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*/
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if (mapFunc == NULL) {
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/* If unrecognized function name, return fn body as-is */
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strncpy(escape, value, sizeof(escape)-1);
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return escape;
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}
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/* copy mapped name and remaining input string */
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strcpy(escape, mapFunc);
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strcat(escape, the_rest);
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}
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strncat(escape, funcEnd, sizeof(escape)-strlen(mapFunc));
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}
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else {
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/* Bogus key, leave untranslated */
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return NULL;
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}
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