From 3b136f23ee4f3ddee1c157dfee2ff84fe6fa130e Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 28 Dec 2012 08:38:47 -0800
Subject: [PATCH] Make add_dc_to_string() skip redundant entries

There is no point writing out divecomputer nicknames that do not exist
(or that match the dive computer model), so don't.

Also, make the function to do this static to save-xml.c, which is the
only user (I initially didn't _find_ the function to create the XML
string because it was illogically hidden in gtk-gui.c), and change the
calling convention to be more direct (pass in a string and return a
result, rather than modify a "pointer to string").

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
---
 dive.h     |  1 -
 gtk-gui.c  | 34 ----------------------------------
 save-xml.c | 34 +++++++++++++++++++++++++++++++++-
 3 files changed, 33 insertions(+), 36 deletions(-)

diff --git a/dive.h b/dive.h
index b77a08468..1191ec6b6 100644
--- a/dive.h
+++ b/dive.h
@@ -530,7 +530,6 @@ extern void flush_divelist(struct dive *dive);
 extern void set_dc_nickname(struct dive *dive);
 extern const char *get_dc_nickname(const char *model, uint32_t deviceid);
 extern void remember_dc(const char *model, uint32_t deviceid, const char *nickname, gboolean change_conf);
-extern void add_dc_to_string(char **dc_xml, struct divecomputer *dc);
 
 #define DIVE_ERROR_PARSE 1
 
diff --git a/gtk-gui.c b/gtk-gui.c
index 974cfe29d..60a1f18d3 100644
--- a/gtk-gui.c
+++ b/gtk-gui.c
@@ -2281,37 +2281,3 @@ void set_dc_nickname(struct dive *dive)
 		dc = dc->next;
 	}
 }
-
-void add_dc_to_string(char **dc_xml, struct divecomputer *dc)
-{
-	char *pattern, *tmp;
-	const char *nickname;
-	int len;
-
-	if (!dc || !dc->model || !*dc->model || !dc->deviceid)
-		/* we have no dc or no model or no deviceid information... nothing to do here */
-		return;
-	len = sizeof(" model='' deviceid=''") + strlen(dc->model) + 8;
-	pattern = malloc(len);
-	snprintf(pattern, len, " model='%s' deviceid='%08x'", dc->model, dc->deviceid);
-	if (*dc_xml && strstr(*dc_xml, pattern)) {
-		/* already have that one */
-		free(pattern);
-		return;
-	}
-	nickname = get_dc_nickname(dc->model, dc->deviceid);
-	if (!nickname || !*nickname || !strcmp(dc->model, nickname)) {
-		/* we still want to store this entry as it explicitly tells us
-		 * "no nickname needed, use model" */
-		len += strlen(*dc_xml) + sizeof("<divecomputerid/>\n");
-		tmp = malloc(len);
-		snprintf(tmp, len, "%s<divecomputerid%s/>\n", *dc_xml, pattern);
-	} else {
-		len += strlen(*dc_xml) + strlen(nickname) + sizeof("<divecomputerid nickname=''/>\n");
-		tmp = malloc(len);
-		snprintf(tmp, len, "%s<divecomputerid%s nickname='%s'/>\n", *dc_xml, pattern, nickname);
-	}
-	free(pattern);
-	free(*dc_xml);
-	*dc_xml = tmp;
-}
diff --git a/save-xml.c b/save-xml.c
index 88ae4e1e9..45caefe4c 100644
--- a/save-xml.c
+++ b/save-xml.c
@@ -443,6 +443,38 @@ static void save_dive(FILE *f, struct dive *dive)
 	fprintf(f, "</dive>\n");
 }
 
+static char *add_dc_to_string(char *dc_xml, struct divecomputer *dc)
+{
+	char *pattern, *tmp;
+	const char *nickname;
+	int len;
+
+	/* we have no dc or no model or no deviceid information... nothing to do here */
+	if (!dc || !dc->model || !*dc->model || !dc->deviceid)
+		return dc_xml;
+
+	nickname = get_dc_nickname(dc->model, dc->deviceid);
+	/* We have no nickname, or it is the same as the model ID - nothing interesting */
+	if (!nickname || !*nickname || !strcmp(dc->model, nickname))
+		return dc_xml;
+
+	len = sizeof(" model='' deviceid=''") + strlen(dc->model) + 8;
+	pattern = malloc(len);
+	snprintf(pattern, len, " model='%s' deviceid='%08x'", dc->model, dc->deviceid);
+	if (dc_xml && strstr(dc_xml, pattern)) {
+		/* already have that one */
+		free(pattern);
+		return dc_xml;
+	}
+
+	len += strlen(dc_xml) + strlen(nickname) + sizeof("<divecomputerid nickname=''/>\n");
+	tmp = malloc(len);
+	snprintf(tmp, len, "%s<divecomputerid%s nickname='%s'/>\n", dc_xml, pattern, nickname);
+	free(pattern);
+	free(dc_xml);
+	return tmp;
+}
+
 #define VERSION 2
 
 void save_dives(const char *filename)
@@ -464,7 +496,7 @@ void save_dives(const char *filename)
 	for_each_dive(i, dive) {
 		struct divecomputer *dc = &dive->dc;
 		while (dc) {
-			add_dc_to_string(&dc_xml, dc);
+			dc_xml = add_dc_to_string(dc_xml, dc);
 			dc = dc->next;
 		}
 	}