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Add support for \x hex escapes in COPY.

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Sergey Ten
This commit is contained in:
Bruce Momjian 2005-06-02 01:21:22 +00:00
parent b6e5c4ad0a
commit 202e6e73e6
2 changed files with 47 additions and 5 deletions
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13
doc/src/sgml/ref/copy.sgml
View File

@ -1,5 +1,5 @@
<!-- <!--
$PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.65 2005/05/07 02:22:45 momjian Exp $ $PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.66 2005/06/02 01:21:21 momjian Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@ -424,13 +424,18 @@ COPY <replaceable class="parameter">tablename</replaceable> [ ( <replaceable cla
<entry>Backslash followed by one to three octal digits specifies <entry>Backslash followed by one to three octal digits specifies
the character with that numeric code</entry> the character with that numeric code</entry>
</row> </row>
<row>
<entry><literal>\x</><replaceable>digits</></entry>
<entry>Backslash <literal>x</> followed by one or two hex digits specifies
the character with that numeric code</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</informaltable> </informaltable>
Presently, <command>COPY TO</command> will never emit an octal-digits Presently, <command>COPY TO</command> will never emit an octal or
backslash sequence, but it does use the other sequences listed above hex-digits backslash sequence, but it does use the other sequences
for those control characters. listed above for those control characters.
</para> </para>
<para> <para>

39
src/backend/commands/copy.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.244 2005/05/07 02:22:46 momjian Exp $ * $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.245 2005/06/02 01:21:22 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -2274,6 +2274,18 @@ CopyReadLine(char * quote, char * escape)
return result; return result;
} }
/*
* Return decimal value for a hexadecimal digit
*/
static
int GetDecimalFromHex(char hex)
{
if (isdigit(hex))
return hex - '0';
else
return tolower(hex) - 'a' + 10;
}
/*---------- /*----------
* Read the value of a single attribute, performing de-escaping as needed. * Read the value of a single attribute, performing de-escaping as needed.
* *
@ -2335,6 +2347,7 @@ CopyReadAttribute(const char *delim, const char *null_print,
case '5': case '5':
case '6': case '6':
case '7': case '7':
/* handle \013 */
{ {
int val; int val;
@ -2360,6 +2373,30 @@ CopyReadAttribute(const char *delim, const char *null_print,
c = val & 0377; c = val & 0377;
} }
break; break;
case 'x':
/* Handle \x3F */
if (line_buf.cursor < line_buf.len)
{
char hexchar = line_buf.data[line_buf.cursor];
if (isxdigit(hexchar))
{
int val = GetDecimalFromHex(hexchar);
line_buf.cursor++;
if (line_buf.cursor < line_buf.len)
{
hexchar = line_buf.data[line_buf.cursor];
if (isxdigit(hexchar))
{
line_buf.cursor++;
val = (val << 4) + GetDecimalFromHex(hexchar);
}
}
c = val & 0xff;
}
}
break;
case 'b': case 'b':
c = '\b'; c = '\b';
break; break;