From 91d0c4148bdb1fca33062b80b669e3c9e00c8030 Mon Sep 17 00:00:00 2001
From: Antonio Ospite <ospite@studenti.unina.it>
Date: Wed, 13 Mar 2013 15:26:07 +0100
Subject: [PATCH] Add a way to filter measurements by user ids

---
 src/visomat-data-downloader.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/visomat-data-downloader.c b/src/visomat-data-downloader.c
index d925388..a91ee43 100644
--- a/src/visomat-data-downloader.c
+++ b/src/visomat-data-downloader.c
@@ -118,7 +118,9 @@ static void print_record_csv_compat(struct datetime *d, struct pressure *p)
 }
 
 /* TODO separate better decoding data from printing it */
-static int decode_eeprom(unsigned char *buffer, unsigned int len)
+static int decode_eeprom(unsigned char *buffer,
+			 unsigned int len,
+			 unsigned int user_mask)
 {
 	int ret;
 	unsigned int n;
@@ -144,7 +146,6 @@ static int decode_eeprom(unsigned char *buffer, unsigned int len)
 			/* i tracks the bytes consumed */
 			i += 1;
 
-
 			ret = sscanf((char *)(buffer + i), "%1u%02u",
 				     &user_id, &num_records);
 			if (ret != 2)
@@ -153,8 +154,6 @@ static int decode_eeprom(unsigned char *buffer, unsigned int len)
 			/* user_id and num_records take 3 bytes */
 			i += 3;
 
-			printf("# User: %d\n", user_id);
-
 			for (j = 0; j < num_records; j++) {
 				ret = extract_datetime(buffer + i, &d);
 				if (ret < 0)
@@ -175,7 +174,12 @@ static int decode_eeprom(unsigned char *buffer, unsigned int len)
 				/* pressure data is 10 bytes */
 				i += 10;
 
-				print_record_csv_compat(&d, &p);
+				/* TODO: split out the printing part */
+				if (user_id & user_mask) {
+					if (j == 0)
+						printf("# User: %d\n", user_id);
+					print_record_csv_compat(&d, &p);
+				}
 			}
 		}
 	}
@@ -266,7 +270,7 @@ static int get_response(libusb_device_handle *dev,
 
 /* Candidates for a future public API, if a shared library will ever be made */
 #define visomat_device libusb_device_handle
-static int visomat_dump_eeprom(visomat_device *dev)
+static int visomat_dump_eeprom(visomat_device *dev, unsigned int user_mask)
 {
 	/* Assuming an EEPROM of 1 KiB  */
 	unsigned char buffer[1024] = { 0 };
@@ -280,7 +284,7 @@ static int visomat_dump_eeprom(visomat_device *dev)
 	if (ret < 0)
 		return ret;
 
-	ret = decode_eeprom(buffer, ret);
+	ret = decode_eeprom(buffer, ret, user_mask);
 	if (ret < 0)
 		return ret;
 
@@ -330,7 +334,7 @@ int main(void)
 	if (ret < 0)
 		goto out;
 
-	ret = visomat_dump_eeprom(dev);
+	ret = visomat_dump_eeprom(dev, 0x01 | 0x02);
 
 out:
 	libusb_close(dev);
-- 
2.1.4