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Add to_bin() and to_oct().

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This commit introduces functions for converting numbers to their
equivalent binary and octal representations.  Also, the base
conversion code for these functions and to_hex() has been moved to
a common helper function.

Co-authored-by: Eric Radman
Reviewed-by: Ian Barwick, Dag Lem, Vignesh C, Tom Lane, Peter Eisentraut, Kirk Wolak, Vik Fearing, John Naylor, Dean Rasheed
Discussion: https://postgr.es/m/Y6IyTQQ/TsD5wnsH%40vm3.eradman.com
This commit is contained in:
Nathan Bossart
2023-08-23 07:49:03 -07:00
parent ccadf73163
commit 260a1f18da
5 changed files with 212 additions and 38 deletions
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102
src/backend/utils/adt/varlena.c
View File

@@ -4919,53 +4919,87 @@ array_to_text_internal(FunctionCallInfo fcinfo, ArrayType *v,
return result;
}
#define HEXBASE 16
/*
* Convert an int32 to a string containing a base 16 (hex) representation of
* Workhorse for to_bin, to_oct, and to_hex. Note that base must be > 1 and <=
* 16.
*/
static inline text *
convert_to_base(uint64 value, int base)
{
const char *digits = "0123456789abcdef";
/* We size the buffer for to_bin's longest possible return value. */
char buf[sizeof(uint64) * BITS_PER_BYTE];
char *const end = buf + sizeof(buf);
char *ptr = end;
Assert(base > 1);
Assert(base <= 16);
do
{
*--ptr = digits[value % base];
value /= base;
} while (ptr > buf && value);
return cstring_to_text_with_len(ptr, end - ptr);
}
/*
* Convert an integer to a string containing a base-2 (binary) representation
* of the number.
*/
Datum
to_bin32(PG_FUNCTION_ARGS)
{
uint64 value = (uint32) PG_GETARG_INT32(0);
PG_RETURN_TEXT_P(convert_to_base(value, 2));
}
Datum
to_bin64(PG_FUNCTION_ARGS)
{
uint64 value = (uint64) PG_GETARG_INT64(0);
PG_RETURN_TEXT_P(convert_to_base(value, 2));
}
/*
* Convert an integer to a string containing a base-8 (oct) representation of
* the number.
*/
Datum
to_oct32(PG_FUNCTION_ARGS)
{
uint64 value = (uint32) PG_GETARG_INT32(0);
PG_RETURN_TEXT_P(convert_to_base(value, 8));
}
Datum
to_oct64(PG_FUNCTION_ARGS)
{
uint64 value = (uint64) PG_GETARG_INT64(0);
PG_RETURN_TEXT_P(convert_to_base(value, 8));
}
/*
* Convert an integer to a string containing a base-16 (hex) representation of
* the number.
*/
Datum
to_hex32(PG_FUNCTION_ARGS)
{
uint32 value = (uint32) PG_GETARG_INT32(0);
char *ptr;
const char *digits = "0123456789abcdef";
char buf[32]; /* bigger than needed, but reasonable */
uint64 value = (uint32) PG_GETARG_INT32(0);
ptr = buf + sizeof(buf) - 1;
*ptr = '\0';
do
{
*--ptr = digits[value % HEXBASE];
value /= HEXBASE;
} while (ptr > buf && value);
PG_RETURN_TEXT_P(cstring_to_text(ptr));
PG_RETURN_TEXT_P(convert_to_base(value, 16));
}
/*
* Convert an int64 to a string containing a base 16 (hex) representation of
* the number.
*/
Datum
to_hex64(PG_FUNCTION_ARGS)
{
uint64 value = (uint64) PG_GETARG_INT64(0);
char *ptr;
const char *digits = "0123456789abcdef";
char buf[32]; /* bigger than needed, but reasonable */
ptr = buf + sizeof(buf) - 1;
*ptr = '\0';
do
{
*--ptr = digits[value % HEXBASE];
value /= HEXBASE;
} while (ptr > buf && value);
PG_RETURN_TEXT_P(cstring_to_text(ptr));
PG_RETURN_TEXT_P(convert_to_base(value, 16));
}
/*