Move everything into a new repo.

1 files changed, 33 insertions, 0 deletions

diff --git a/userland/libc/stdio/sprintf.c b/userland/libc/stdio/sprintf.c
new file mode 100644
index 0000000..deffbbe
--- /dev/null
+++ b/userland/libc/stdio/sprintf.c
@@ -0,0 +1,33 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+struct s_cookie {
+  char *s;
+};
+
+size_t s_write(FILE *f, const unsigned char *s, size_t l) {
+  struct s_cookie *c = f->cookie;
+  memcpy(c->s, s, l);
+  c->s += l;
+  *(c->s) = '\0';
+  return l;
+}
+
+int vsprintf(char *str, const char *format, va_list ap) {
+  struct s_cookie c = {.s = str};
+  FILE f = {
+      .write = s_write,
+      .cookie = &c,
+  };
+  return vfprintf(&f, format, ap);
+}
+
+int sprintf(char *str, const char *format, ...) {
+  va_list ap;
+  va_start(ap, format);
+  int rc = vsprintf(str, format, ap);
+  va_end(ap);
+  return rc;
+}