From a1f41743c249d280a4dc56c6433b6b5817388934 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Sun, 29 Mar 2015 08:02:45 -0700
Subject: Add crystal_add_notes()

---
 libcrystfel/src/crystal.c | 25 +++++++++++++++++++++++++
 libcrystfel/src/crystal.h |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/libcrystfel/src/crystal.c b/libcrystfel/src/crystal.c
index 91c3fd52..3c52ddd7 100644
--- a/libcrystfel/src/crystal.c
+++ b/libcrystfel/src/crystal.c
@@ -291,3 +291,28 @@ void crystal_set_notes(Crystal *cryst, const char *notes)
 	free(cryst->notes);  /* free(NULL) is OK */
 	cryst->notes = strdup(notes);
 }
+
+
+void crystal_add_notes(Crystal *cryst, const char *notes_add)
+{
+	size_t len;
+	char *nnotes;
+
+	if ( cryst->notes == NULL ) {
+		crystal_set_notes(cryst, notes_add);
+		return;
+	}
+
+	len = strlen(notes_add) + strlen(cryst->notes) + 2;
+	nnotes = malloc(len);
+	if ( nnotes == NULL ) {
+		ERROR("Failed to add notes to crystal.\n");
+		return;
+	}
+
+	strcpy(nnotes, cryst->notes);
+	strcat(nnotes, "\n");
+	strcat(nnotes, notes_add);
+	free(cryst->notes);
+	cryst->notes = nnotes;
+}
diff --git a/libcrystfel/src/crystal.h b/libcrystfel/src/crystal.h
index 92f60fc3..f0d732ff 100644
--- a/libcrystfel/src/crystal.h
+++ b/libcrystfel/src/crystal.h
@@ -82,6 +82,8 @@ extern void crystal_set_image(Crystal *cryst, struct image *image);
 extern void crystal_set_mosaicity(Crystal *cryst, double m);
 extern void crystal_set_notes(Crystal *cryst, const char *notes);
 
+extern void crystal_add_notes(Crystal *cryst, const char *notes_add);
+
 #ifdef __cplusplus
 }
 #endif
-- 
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