ptimize %k output

MaJerle · Aug 29, 2020 · 703527a · 703527a
1 parent 1987ac4
commit 703527a
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 3 deletions.
diff --git a/examples/additional_format_specifiers.c b/examples/additional_format_specifiers.c
@@ -30,4 +30,6 @@ additional_format_specifiers(void) {
     lwprintf_printf("%*k\r\n", sizeof(my_array) / sizeof(my_array[0]), my_array);
     /* Variable length with uppercase letters and spaces, outputs "01 02 A4 B5 C6" */
     lwprintf_printf("% *K\r\n", sizeof(my_array) / sizeof(my_array[0]), my_array);
+    /* Variable length with uppercase letters and spaces, outputs "01 02 a4 b5 c6" */
+    lwprintf_printf("% *k\r\n", sizeof(my_array) / sizeof(my_array[0]), my_array);
 }
diff --git a/lwprintf/src/lwprintf/lwprintf.c b/lwprintf/src/lwprintf/lwprintf.c
@@ -764,10 +764,12 @@ prv_format(lwprintf_int_t* p, va_list arg) {
                 unsigned char* ptr = (void *)va_arg(arg, unsigned char *);  /* Get input parameter as unsigned char pointer */
                 int len = p->m.width;
 
+                if (ptr == NULL || len == 0) {
+                    break;
+                }
+
                 p->m.flags.uc = *fmt == 'K';    /* Set if uppercase */
-                p->m.flags.precision = 1;       /* We use precision flag */
-                p->m.precision = 2;             /* 2 bytes output, 0 prepend if necessary */
-                p->m.flags.zero = 1;            /* Prepend with zeros */
+                p->m.flags.zero = 1;            /* Prepend with zeros if necessary */
                 p->m.width = 2;                 /* Each number is 2 chars min/max */
                 p->m.base = 16;                 /* Hex format */