[XTF 2/4] lib: always append CR after LF in vsnprintf()

[Pawel Wieczorkiewicz]

The explicit LFCR sequence guarantees proper line by line formatting
in the output.
The '\n' character alone on some terminals is not automatically
converted to LFCR.

Signed-off-by: Pawel Wieczorkiewicz <wipa...@amazon.de>
---
 common/libc/vsnprintf.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/common/libc/vsnprintf.c b/common/libc/vsnprintf.c
index a49fd30..3202137 100644
--- a/common/libc/vsnprintf.c
+++ b/common/libc/vsnprintf.c
@@ -285,6 +285,16 @@ int vsnprintf(char *buf, size_t size, const char *fmt, 
va_list args)
         if ( *fmt != '%' )
         {
             PUT(*fmt);
+
+            /*
+             * The '\n' character alone on some terminals is not automatically
+             * converted to LFCR.
+             * The explicit LFCR sequence guarantees proper line by line
+             * formatting in the output.
+             */
+            if ( *fmt == '\n' && str < end )
+                PUT('\r');
+
             continue;
         }
 
-- 
2.16.6




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