From db9f5f34a33c7bac44856367d912650d5b8a3cd7 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 3 Feb 2020 16:15:05 +0100
Subject: [PATCH] --loop option to read input file again and again.

---
 dump1090.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/dump1090.c b/dump1090.c
index e8d01799b..8e84a60ac 100644
--- a/dump1090.c
+++ b/dump1090.c
@@ -155,6 +155,7 @@ struct {
 
     /* Configuration */
     char *filename;                 /* Input form file, --ifile option. */
+    int loop;                       /* Read input file again and again. */
     int fix_errors;                 /* Single bit error correction if true. */
     int check_crc;                  /* Only display messages with good CRC. */
     int raw;                        /* Raw output format. */
@@ -274,6 +275,7 @@ void modesInitConfig(void) {
     Modes.interactive_ttl = MODES_INTERACTIVE_TTL;
     Modes.aggressive = 0;
     Modes.interactive_rows = getTermRows();
+    Modes.loop = 0;
 }
 
 void modesInit(void) {
@@ -434,10 +436,11 @@ void readDataFromFile(void) {
         while(toread) {
             nread = read(Modes.fd, p, toread);
             /* In --file mode, seek the file again from the start
-             * and re-play it. */
+             * and re-play it if --loop was given. */
             if (nread == 0 &&
                 Modes.filename != NULL &&
-                Modes.fd != STDIN_FILENO)
+                Modes.fd != STDIN_FILENO &&
+                Modes.loop)
             {
                 if (lseek(Modes.fd,0,SEEK_SET) != -1) continue;
             }
@@ -2440,6 +2443,7 @@ void showHelp(void) {
 "--enable-agc             Enable the Automatic Gain Control (default: off).\n"
 "--freq <hz>              Set frequency (default: 1090 Mhz).\n"
 "--ifile <filename>       Read data from file (use '-' for stdin).\n"
+"--loop                   With --ifile, read the same file in a loop.\n"
 "--interactive            Interactive mode refreshing data on screen.\n"
 "--interactive-rows <num> Max number of rows in interactive mode (default: 15).\n"
 "--interactive-ttl <sec>  Remove from list if idle for <sec> (default: 60).\n"
@@ -2511,6 +2515,8 @@ int main(int argc, char **argv) {
             Modes.freq = strtoll(argv[++j],NULL,10);
         } else if (!strcmp(argv[j],"--ifile") && more) {
             Modes.filename = strdup(argv[++j]);
+        } else if (!strcmp(argv[j],"--loop")) {
+            Modes.loop = 1;
         } else if (!strcmp(argv[j],"--no-fix")) {
             Modes.fix_errors = 0;
         } else if (!strcmp(argv[j],"--no-crc-check")) {