Add support for \x hex escapes in COPY.

Sergey Ten

diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml
index 0dd10d6754d1a5b49088e73ddf8fcb4876eb61c5..188f892fa0f495a42caaf327fd51a667b7999f00 100644 (file)
--- a/doc/src/sgml/ref/copy.sgml
+++ b/doc/src/sgml/ref/copy.sgml
@@ -1,5 +1,5 @@
 
 
@@ -424,13 +424,18 @@ COPY tablename [ ( 
        Backslash followed by one to three octal digits specifies
        the character with that numeric code
       
+      
+       \xdigits
+       Backslash x followed by one or two hex digits specifies
+       the character with that numeric code
+      
      
     
    
 
-    Presently, COPY TO will never emit an octal-digits
-    backslash sequence, but it does use the other sequences listed above
-    for those control characters.
+    Presently, COPY TO will never emit an octal or 
+    hex-digits backslash sequence, but it does use the other sequences
+    listed above for those control characters.
    
 
    

diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index 35ae86814dcfc82574dafa1b061dd6ffdcdeede9..30eeefded8e4e1d6deeafb72a59208e64d644ecf 100644 (file)
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -8,7 +8,7 @@
  *
  *
  * 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 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.
  *
@@ -2335,6 +2347,7 @@ CopyReadAttribute(const char *delim, const char *null_print,
                case '5':
                case '6':
                case '7':
+                   /* handle \013 */
                    {
                        int         val;
 
@@ -2360,6 +2373,30 @@ CopyReadAttribute(const char *delim, const char *null_print,
                        c = val & 0377;
                    }
                    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':
                    c = '\b';
                    break;