Init

1 files changed, 64 insertions, 0 deletions

diff --git a/stdio/fmemopen.c b/stdio/fmemopen.c
new file mode 100644
index 0000000..6aac757
--- /dev/null
+++ b/stdio/fmemopen.c
@@ -0,0 +1,64 @@
+/*-*- 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/mem/mem.h"
+#include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
+#include "libc/sysv/consts/o.h"
+#include "libc/sysv/errfuns.h"
+
+/**
+ * Opens buffer as stream.
+ *
+ * @param buf becomes owned by this function, and is allocated if NULL
+ * @return new stream or NULL w/ errno
+ */
+FILE *fmemopen(void *buf, size_t size, const char *mode) {
+  FILE *f;
+  char *p;
+  unsigned flags;
+  if (size && size > 0x7ffff000) {
+    einval();
+    return NULL;
+  }
+  if (!(f = calloc(1, sizeof(FILE)))) {
+    return NULL;
+  }
+  if (buf) {
+    f->nofree = true;
+  } else {
+    if (!size) size = BUFSIZ;
+    if (!(buf = calloc(1, size))) {
+      free(f);
+      return NULL;
+    }
+  }
+  f->fd = -1;
+  f->buf = buf;
+  f->end = size;
+  f->size = size;
+  f->iomode = fopenflags(mode);
+  if (f->iomode & O_APPEND) {
+    if ((p = memchr(buf, '\0', size))) {
+      f->beg = p - (char *)buf;
+    } else {
+      f->beg = f->end;
+    }
+  }
+  return f;
+}