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libmysql.c:

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New function mysql_hex_string()
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bar@mysql.com
2004-10-19 09:50:47 +05:00
parent 34e5df0d36
commit c01c8f99ea
1 changed files with 33 additions and 0 deletions
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33
libmysql/libmysql.c
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@ -3153,6 +3153,39 @@ void my_net_local_init(NET *net)
net->max_packet_size= max(net_buffer_length, max_allowed_packet);
}
/*
This function is used to create HEX string that you
can use in a SQL statement in of the either ways:
INSERT INTO blob_column VALUES (0xAABBCC); (any MySQL version)
INSERT INTO blob_column VALUES (X'AABBCC'); (4.1 and higher)
The string in "from" is encoded to a HEX string.
The result is placed in "to" and a terminating null byte is appended.
The string pointed to by "from" must be "length" bytes long.
You must allocate the "to" buffer to be at least length*2+1 bytes long.
Each character needs two bytes, and you need room for the terminating
null byte. When mysql_hex_string() returns, the contents of "to" will
be a null-terminated string. The return value is the length of the
encoded string, not including the terminating null character.
*/
unsigned long
mysql_hex_string(char *to, const char *from, unsigned long length)
{
char *to0= to;
const char *end;
static char hex[]= "0123456789ABCDEF";
for (end= from + length; from < end; from++)
{
*to++= hex[((unsigned char) *from) >> 4];
*to++= hex[((unsigned char) *from) & 0x0F];
}
*to= '\0';
return to-to0;
}
/*
Add escape characters to a string (blob?) to make it suitable for a insert
to should at least have place for length*2+1 chars