1 files changed, 44 insertions, 0 deletions
diff --git a/stdio/fscanf.c b/stdio/fscanf.c
new file mode 100644
index 0000000..a713b7b
--- /dev/null
+++ b/stdio/fscanf.c
@@ -0,0 +1,44 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/fmt/fmt.h"
+#include "libc/stdio/stdio.h"
+
+/**
+ * Decodes data from stream.
+ *
+ * To read a line of data from a well-formed trustworthy file:
+ *
+ *     int x, y;
+ *     char text[256];
+ *     fscanf(f, "%d %d %s\n", &x, &y, text);
+ *
+ * Please note that this function is brittle by default, which makes it
+ * a good fit for yolo coding. With some toil it can be used in a way
+ * that makes it reasonably hardened although getline() may be better.
+ *
+ * @see libc/fmt/vcscanf.c
+ */
+int(fscanf)(FILE *stream, const char *fmt, ...) {
+  int rc;
+  va_list va;
+  va_start(va, fmt);
+  rc = (vcscanf)((int (*)(void *))fgetc, (void *)ungetc, stream, fmt, va);
+  va_end(va);
+  return rc;
+}