From b77e01a5d218c73ef7b0cff8ca18a57168a2ff7d Mon Sep 17 00:00:00 2001
From: antifallobst <antifallobst@systemausfall.org>
Date: Thu, 23 Feb 2023 11:22:33 +0100
Subject: [PATCH] feature (kernel): Implemented numeric_specifier feature for
 substrings in format strings

---
 kernel/src/utils/string.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/kernel/src/utils/string.c b/kernel/src/utils/string.c
index b7a46b3..5ad49b0 100644
--- a/kernel/src/utils/string.c
+++ b/kernel/src/utils/string.c
@@ -64,7 +64,14 @@ uint64_t variadic_format_size(string_t string, va_list args) {
                 }
                 case 's': {
                     // string
-                    length += string_length(va_arg(args, string_t));
+                    uint64_t strlen = string_length(va_arg(args, string_t));
+                    if (numeric_specifier > 0) {
+                        strlen = MIN(strlen, numeric_specifier);
+                    } else {
+                        strlen = numeric_specifier;
+                    }
+
+                    length += strlen;
                     break;
                 }
                 case 'c': {
@@ -187,6 +194,12 @@ void variadic_format(string_t output, string_t string, va_list args) {
                     string_t str    = va_arg(args, string_t);
                     uint64_t strlen = string_length(str);
 
+                    if (numeric_specifier > 0) {
+                        strlen = MIN(strlen, numeric_specifier);
+                    } else {
+                        strlen = numeric_specifier;
+                    }
+
                     memory_copy((void*)str, buffer_out, strlen);
                     buffer_out += strlen;
                     break;