From 197446db5f9ea0ee7088fcb4b21b97d5f9865cc8 Mon Sep 17 00:00:00 2001
From: Laurence Withers <lwithers@guralp.com>
Date: Mon, 7 Jul 2014 09:56:28 +0000
Subject: [PATCH] Add iir_coeff_copy()

---
 src/libiir/200_iir.c | 21 +++++++++++++++++++++
 src/libiir/200_iir.h | 12 ++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/libiir/200_iir.c b/src/libiir/200_iir.c
index da59edf..4cb6b18 100644
--- a/src/libiir/200_iir.c
+++ b/src/libiir/200_iir.c
@@ -44,6 +44,27 @@ iir_coeff_new(int nc, const double* c, int nd, const double* d)
 
 
 
+/* iir_coeff_copy()
+ *  Deep copy of coefficient object.
+ */
+struct iir_coeff_t*
+iir_coeff_copy(const struct iir_coeff_t* other)
+{
+    struct iir_coeff_t* coeff;
+
+    coeff = malloc(sizeof(struct iir_coeff_t));
+    coeff->nc = other->nc;
+    coeff->nd = other->nd;
+    coeff->c = malloc(sizeof(double) * coeff->nc);
+    coeff->d = malloc(sizeof(double) * coeff->nd);
+    memcpy(coeff->c, other->c, sizeof(double) * coeff->nc);
+    memcpy(coeff->d, other->d, sizeof(double) * coeff->nd);
+
+    return coeff;
+}
+
+
+
 /* iir_coeff_free()
  *  Frees memory associated with ‘coeff’.
  */
diff --git a/src/libiir/200_iir.h b/src/libiir/200_iir.h
index ed6d000..0d1d713 100644
--- a/src/libiir/200_iir.h
+++ b/src/libiir/200_iir.h
@@ -55,6 +55,18 @@ struct iir_coeff_t* iir_coeff_new(int nc, const double* c, int nd,
 
 
 
+/*! \brief Create copy of general IIR filter
+
+\param other Set of IIR filter coefficients to copy.
+\returns Pointer to new general IIR filter object.
+
+Performs a deep copy of the set of IIR coefficients contained within \a other.
+
+*/
+struct iir_coeff_t* iir_coeff_copy(const struct iir_coeff_t* other);
+
+
+
 /*! \brief Free general IIR filter
 
 \param coeff Pointer to IIR filter object. May be 0.