std/stdio: support asprintf() and vasprintf()

CMakeLists.txt

@@ -45,6 +45,7 @@ set(SOURCES_COMMON
   src/rtc/rtc.c
   src/rtc/rtc_ticks.c
   src/spu/spu.c
+  src/std/aprint.c
   src/std/memcmp.s
   src/std/memcpy.s
   src/std/memmove.s

include/gint/std/stdio.h

@@ -17,7 +17,7 @@
    * Parameter length (hh, h, l, ll, z)
    * Limiting the size of the output and still returning the whole length
    * If kprint_enable_fp() from <gint/kprint.h> is called: floating-point
-     formats (%e, %E, %f, %F, %g, %G) (disabled by default for space)
+     formats (%e, %E, %f, %F, %g, %G) (disabled by default to save space)
 
    They do not support:
    * Hexadecimal floating-point (%a, %A)
@@ -41,5 +41,9 @@ int vsprintf(char *str, char const *format, va_list args);
 int snprintf(char *str, size_t n, char const *format, ...);
 /* Print to string with limited size from va_list */
 int vsnprintf(char *str, size_t n, char const *format, va_list args);
+/* Print to auto-allocated string */
+int asprintf(char **strp, char const *format, ...);
+/* Print to auto-allocated string from va_list */
+int vasprintf(char **strp, char const *format, va_list args);
 
 #endif /* GINT_STD_STDIO */

src/std/aprint.c

@@ -0,0 +1,38 @@
+//---
+//	gint:src:aprint - Allocating extensions to formatted printing
+//---
+
+#include <gint/std/stdio.h>
+#include <gint/std/stdlib.h>
+#include <gint/kprint.h>
+#include <stdarg.h>
+
+/* asprintf() */
+GWEAK int asprintf(char **strp, char const *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	int count = vasprintf(strp, format, args);
+
+	va_end(args);
+	return count;
+}
+
+/* vasprintf() */
+GWEAK int vasprintf(char **strp, char const *format, va_list args1)
+{
+	va_list args2;
+	va_copy(args2, args1);
+
+	int count = vsnprintf(NULL, 0, format, args1);
+	va_end(args1);
+
+	char *str = malloc(count + 1);
+	if(str) count = vsnprintf(str, count + 1, format, args2);
+	va_end(args2);
+
+	if(!str) return -1;
+	*strp = str;
+	return count;
+}