Avoid using sprintf() for a simple octal conversion in PQescapeByteaInternal.

Improves performance, per suggestion from Rudolf Leitgeb (bug #4414).
The backend did this right already, but not libpq.

diff --git a/src/interfaces/libpq/fe-exec.c b/src/interfaces/libpq/fe-exec.c
index 37f3f9946e2ad6cb57235da5a444f03937f21950..dbe75e6140c6cdc7695524be13c102ddba435a20 100644 (file)
--- a/src/interfaces/libpq/fe-exec.c
+++ b/src/interfaces/libpq/fe-exec.c
@@ -2763,10 +2763,14 @@ PQescapeByteaInternal(PGconn *conn,
        {
                if (*vp < 0x20 || *vp > 0x7e)
                {
+                       int             val = *vp;
+
                        if (!std_strings)
                                *rp++ = '\\';
-                       (void) sprintf((char *) rp, "\\%03o", *vp);
-                       rp += 4;
+                       *rp++ = '\\';
+                       *rp++ = (val >> 6) + '0';
+                       *rp++ = ((val >> 3) & 07) + '0';
+                       *rp++ = (val & 07) + '0';
                }
                else if (*vp == '\'')
                {