From d55015e4cfd419582a4c7710125571241a377480 Mon Sep 17 00:00:00 2001
From: Romain Vimont <rom@rom1v.com>
Date: Sun, 17 Oct 2021 16:30:07 +0200
Subject: [PATCH] Expose function to get the device serial

Expose adb_get_serialno() to retrieve the device serial via the command
"adb getserialno".
---
 app/src/adb.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 app/src/adb.h |  4 ++++
 2 files changed, 48 insertions(+)

diff --git a/app/src/adb.c b/app/src/adb.c
index 6b4d6fc0..7f7e28d8 100644
--- a/app/src/adb.c
+++ b/app/src/adb.c
@@ -233,3 +233,47 @@ adb_install(const char *serial, const char *local) {
 
     return proc;
 }
+
+static ssize_t
+adb_execute_for_output(const char *serial, const char *const adb_cmd[],
+                       size_t adb_cmd_len, char *buf, size_t buf_len,
+                       const char *name) {
+    pipe_t pipe_stdout;
+    process_t proc = adb_execute_redirect(serial, adb_cmd, adb_cmd_len, NULL,
+                                          &pipe_stdout, NULL);
+
+    ssize_t r = read_pipe_all(pipe_stdout, buf, buf_len);
+    close_pipe(pipe_stdout);
+
+    if (!process_check_success(proc, name, true)) {
+        return -1;
+    }
+
+    return r;
+}
+
+static size_t
+truncate_first_line(char *data, size_t len) {
+    data[len - 1] = '\0';
+    char *eol = strpbrk(data, "\r\n");
+    if (eol) {
+        *eol = '\0';
+        len = eol - data;
+    }
+    return len;
+}
+
+char *
+adb_get_serialno(void) {
+    char buf[128];
+
+    const char *const adb_cmd[] = {"get-serialno"};
+    ssize_t r = adb_execute_for_output(NULL, adb_cmd, ARRAY_LEN(adb_cmd),
+                                       buf, sizeof(buf), "get-serialno");
+    if (r <= 0) {
+        return NULL;
+    }
+
+    truncate_first_line(buf, r);
+    return strdup(buf);
+}
diff --git a/app/src/adb.h b/app/src/adb.h
index d2f703a7..34182fd3 100644
--- a/app/src/adb.h
+++ b/app/src/adb.h
@@ -36,4 +36,8 @@ adb_push(const char *serial, const char *local, const char *remote);
 process_t
 adb_install(const char *serial, const char *local);
 
+// Return the result of "adb get-serialno".
+char *
+adb_get_serialno(void);
+
 #endif