From e9468b25e1644bca78f959c04bc194dd594a1446 Mon Sep 17 00:00:00 2001
From: Wirtos_new <Wirtos.new@gmail.com>
Date: Sat, 19 Jun 2021 17:30:22 +0300
Subject: [PATCH] add xargvlen

---
 app/src/util/str_util.c | 12 ++++++++++++
 app/src/util/str_util.h |  4 ++++
 2 files changed, 16 insertions(+)

diff --git a/app/src/util/str_util.c b/app/src/util/str_util.c
index 287c08de..df7fa25c 100644
--- a/app/src/util/str_util.c
+++ b/app/src/util/str_util.c
@@ -10,6 +10,18 @@
 # include <tchar.h>
 #endif
 
+size_t
+xargvlen(const char *const *argv, size_t *n_args) {
+    size_t i, len = 0;
+    for (i = 0; argv[i]; i++) {
+        len += strlen(argv[i]);
+        if(i != 0) len += 1; /* extra for space */
+    }
+    if (n_args) *n_args = i;
+
+    return len;
+}
+
 size_t
 xstrncpy(char *dest, const char *src, size_t n) {
     size_t i;
diff --git a/app/src/util/str_util.h b/app/src/util/str_util.h
index 361d2bdd..2f43e50f 100644
--- a/app/src/util/str_util.h
+++ b/app/src/util/str_util.h
@@ -6,6 +6,10 @@
 #include <stdbool.h>
 #include <stddef.h>
 
+// returns the flat buffer size large enough to store all argv elements (excluding nul terminator) plus separating spaces
+size_t
+xargvlen(const char * const argv[], size_t *n_args);
+
 // like strncpy, except:
 //  - it copies at most n-1 chars
 //  - the dest string is nul-terminated