[Tarantool-patches] [PATCH v1 01/21] sql: refactor CHAR() function
imeevma at tarantool.org
imeevma at tarantool.org
Fri Oct 8 20:31:35 MSK 2021
Part of #4145
---
src/box/sql/func.c | 85 ++++++++++++++++++++++------------------------
1 file changed, 40 insertions(+), 45 deletions(-)
diff --git a/src/box/sql/func.c b/src/box/sql/func.c
index a3c7d8d20..dd5e7d785 100644
--- a/src/box/sql/func.c
+++ b/src/box/sql/func.c
@@ -738,6 +738,45 @@ func_substr_characters(struct sql_context *ctx, int argc, struct Mem *argv)
ctx->is_aborted = true;
}
+/** Implementation of the CHAR() function. */
+static void
+func_char(struct sql_context *ctx, int argc, struct Mem *argv)
+{
+ if (argc == 0)
+ return mem_set_str_static(ctx->pOut, "", 0);
+ char *str = sqlDbMallocRawNN(sql_get(), argc * 4);
+ if (str == NULL) {
+ ctx->is_aborted = true;
+ return;
+ }
+ uint8_t *ptr = (uint8_t *)str;
+ for (int i = 0; i < argc; ++i) {
+ uint32_t c;
+ if (mem_is_null(&argv[i]))
+ c = 0;
+ else if (!mem_is_uint(&argv[i]) || argv[i].u.u > 0x10ffff)
+ c = 0xfffd;
+ else
+ c = argv[i].u.u;
+ if (c < 0x80) {
+ *ptr++ = c & 0xFF;
+ } else if (c < 0x0800) {
+ *ptr++ = 0xC0 + ((c >> 6) & 0x1F);
+ *ptr++ = 0x80 + (c & 0x3F);
+ } else if (c < 0x10000) {
+ *ptr++ = 0xE0 + ((c >> 12) & 0x0F);
+ *ptr++ = 0x80 + ((c >> 6) & 0x3F);
+ *ptr++ = 0x80 + (c & 0x3F);
+ } else {
+ *ptr++ = 0xF0 + ((c >> 18) & 0x07);
+ *ptr++ = 0x80 + ((c >> 12) & 0x3F);
+ *ptr++ = 0x80 + ((c >> 6) & 0x3F);
+ *ptr++ = 0x80 + (c & 0x3F);
+ }
+ }
+ mem_set_str_allocated(ctx->pOut, str, (char *)ptr - str);
+}
+
static const unsigned char *
mem_as_ustr(struct Mem *mem)
{
@@ -1469,50 +1508,6 @@ unicodeFunc(struct sql_context *context, int argc, struct Mem *argv)
sql_result_uint(context, sqlUtf8Read(&z));
}
-/*
- * The char() function takes zero or more arguments, each of which is
- * an integer. It constructs a string where each character of the string
- * is the unicode character for the corresponding integer argument.
- */
-static void
-charFunc(struct sql_context *context, int argc, struct Mem *argv)
-{
- unsigned char *z, *zOut;
- int i;
- zOut = z = sql_malloc64(argc * 4 + 1);
- if (z == NULL) {
- context->is_aborted = true;
- return;
- }
- for (i = 0; i < argc; i++) {
- uint64_t x;
- unsigned c;
- if (sql_value_type(&argv[i]) == MP_INT)
- x = 0xfffd;
- else
- x = mem_get_uint_unsafe(&argv[i]);
- if (x > 0x10ffff)
- x = 0xfffd;
- c = (unsigned)(x & 0x1fffff);
- if (c < 0x00080) {
- *zOut++ = (u8) (c & 0xFF);
- } else if (c < 0x00800) {
- *zOut++ = 0xC0 + (u8) ((c >> 6) & 0x1F);
- *zOut++ = 0x80 + (u8) (c & 0x3F);
- } else if (c < 0x10000) {
- *zOut++ = 0xE0 + (u8) ((c >> 12) & 0x0F);
- *zOut++ = 0x80 + (u8) ((c >> 6) & 0x3F);
- *zOut++ = 0x80 + (u8) (c & 0x3F);
- } else {
- *zOut++ = 0xF0 + (u8) ((c >> 18) & 0x07);
- *zOut++ = 0x80 + (u8) ((c >> 12) & 0x3F);
- *zOut++ = 0x80 + (u8) ((c >> 6) & 0x3F);
- *zOut++ = 0x80 + (u8) (c & 0x3F);
- }
- }
- sql_result_text64(context, (char *)z, zOut - z, sql_free);
-}
-
/*
* The hex() function. Interpret the argument as a blob. Return
* a hexadecimal rendering as text.
@@ -1865,7 +1860,7 @@ static struct sql_func_definition definitions[] = {
NULL},
{"AVG", 1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_INTEGER, step_avg, fin_avg},
{"AVG", 1, {FIELD_TYPE_DOUBLE}, FIELD_TYPE_DOUBLE, step_avg, fin_avg},
- {"CHAR", -1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_STRING, charFunc, NULL},
+ {"CHAR", -1, {FIELD_TYPE_INTEGER}, FIELD_TYPE_STRING, func_char, NULL},
{"CHAR_LENGTH", 1, {FIELD_TYPE_STRING}, FIELD_TYPE_INTEGER,
func_char_length, NULL},
{"COALESCE", -1, {FIELD_TYPE_ANY}, FIELD_TYPE_SCALAR, sql_builtin_stub,
--
2.25.1
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