lib/libc: Make vfprintf definition match musl

Musl's stdio.h defines `vfprintf` as an inline function that
calls `vfprintf_worker` with a fourth argument that
determines whether address-like values should be printed or
not. To use musl for the kernel, this commit renames the
`vfprintf` definition in stdio.c to `vfprintf_worker` and
changes the function signature to match musl.

Bug: 230134581
Change-Id: I94dd4100c06b0a23d55a0ccdbcd3e2dee4f40a10

2 files changed, 5 insertions, 2 deletions

diff --git a/lib/libc/include/stdio.h b/lib/libc/include/stdio.h
index 01315da5..3ef8932e 100644
--- a/lib/libc/include/stdio.h
+++ b/lib/libc/include/stdio.h
@@ -68,7 +68,10 @@ int printf(const char *fmt, ...) __PRINTFLIKE(1, 2);
 int vprintf(const char *fmt, va_list ap);
 
 int fprintf(FILE *fp, const char *fmt, ...) __PRINTFLIKE(2, 3);
-int vfprintf(FILE *fp, const char *fmt, va_list ap);
+int vfprintf_worker(FILE *fp, const char *fmt, va_list ap, int filtered_on_release);
+static inline int vfprintf(FILE *fp, const char *fmt, va_list ap) {
+    return vfprintf_worker(fp, fmt, ap, 1);
+}
 
 int sprintf(char *str, const char *fmt, ...) __PRINTFLIKE(2, 3);
 int snprintf(char *str, size_t len, const char *fmt, ...) __PRINTFLIKE(3, 4);
diff --git a/lib/libc/stdio.c b/lib/libc/stdio.c
index e9ee106d..8b41bf6c 100644
--- a/lib/libc/stdio.c
+++ b/lib/libc/stdio.c
@@ -108,7 +108,7 @@ static int _fprintf_output_func(const char *str, size_t len, void *state)
     return io_write(fp->io, str, len);
 }
 
-int vfprintf(FILE *fp, const char *fmt, va_list ap)
+int vfprintf_worker(FILE *fp, const char *fmt, va_list ap, int filtered_on_release)
 {
     io_lock(fp->io);
     int result = _printf_engine(&_fprintf_output_func, (void *)fp, fmt, ap);