1 files changed, 188 insertions, 0 deletions
diff --git a/gnulib-tests/read-file.c b/gnulib-tests/read-file.c
new file mode 100644
index 0000000..f7b1199
--- /dev/null
+++ b/gnulib-tests/read-file.c
@@ -0,0 +1,188 @@
+/* read-file.c -- read file contents into a string
+   Copyright (C) 2006, 2009-2016 Free Software Foundation, Inc.
+   Written by Simon Josefsson and Bruno Haible.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include "read-file.h"
+
+/* Get fstat.  */
+#include <sys/stat.h>
+
+/* Get ftello.  */
+#include <stdio.h>
+
+/* Get SIZE_MAX.  */
+#include <stdint.h>
+
+/* Get malloc, realloc, free. */
+#include <stdlib.h>
+
+/* Get errno. */
+#include <errno.h>
+
+/* Read a STREAM and return a newly allocated string with the content,
+   and set *LENGTH to the length of the string.  The string is
+   zero-terminated, but the terminating zero byte is not counted in
+   *LENGTH.  On errors, *LENGTH is undefined, errno preserves the
+   values set by system functions (if any), and NULL is returned.  */
+char *
+fread_file (FILE *stream, size_t *length)
+{
+  char *buf = NULL;
+  size_t alloc = BUFSIZ;
+
+  /* For a regular file, allocate a buffer that has exactly the right
+     size.  This avoids the need to do dynamic reallocations later.  */
+  {
+    struct stat st;
+
+    if (fstat (fileno (stream), &st) >= 0 && S_ISREG (st.st_mode))
+      {
+        off_t pos = ftello (stream);
+
+        if (pos >= 0 && pos < st.st_size)
+          {
+            off_t alloc_off = st.st_size - pos;
+
+            /* '1' below, accounts for the trailing NUL.  */
+            if (SIZE_MAX - 1 < alloc_off)
+              {
+                errno = ENOMEM;
+                return NULL;
+              }
+
+            alloc = alloc_off + 1;
+          }
+      }
+  }
+
+  if (!(buf = malloc (alloc)))
+    return NULL; /* errno is ENOMEM.  */
+
+  {
+    size_t size = 0; /* number of bytes read so far */
+    int save_errno;
+
+    for (;;)
+      {
+        /* This reads 1 more than the size of a regular file
+           so that we get eof immediately.  */
+        size_t requested = alloc - size;
+        size_t count = fread (buf + size, 1, requested, stream);
+        size += count;
+
+        if (count != requested)
+          {
+            save_errno = errno;
+            if (ferror (stream))
+              break;
+
+            /* Shrink the allocated memory if possible.  */
+            if (size < alloc - 1)
+              {
+                char *smaller_buf = realloc (buf, size + 1);
+                if (smaller_buf != NULL)
+                  buf = smaller_buf;
+              }
+
+            buf[size] = '\0';
+            *length = size;
+            return buf;
+          }
+
+        {
+          char *new_buf;
+
+          if (alloc == SIZE_MAX)
+            {
+              save_errno = ENOMEM;
+              break;
+            }
+
+          if (alloc < SIZE_MAX - alloc / 2)
+            alloc = alloc + alloc / 2;
+          else
+            alloc = SIZE_MAX;
+
+          if (!(new_buf = realloc (buf, alloc)))
+            {
+              save_errno = errno;
+              break;
+            }
+
+          buf = new_buf;
+        }
+      }
+
+    free (buf);
+    errno = save_errno;
+    return NULL;
+  }
+}
+
+static char *
+internal_read_file (const char *filename, size_t *length, const char *mode)
+{
+  FILE *stream = fopen (filename, mode);
+  char *out;
+  int save_errno;
+
+  if (!stream)
+    return NULL;
+
+  out = fread_file (stream, length);
+
+  save_errno = errno;
+
+  if (fclose (stream) != 0)
+    {
+      if (out)
+        {
+          save_errno = errno;
+          free (out);
+        }
+      errno = save_errno;
+      return NULL;
+    }
+
+  return out;
+}
+
+/* Open and read the contents of FILENAME, and return a newly
+   allocated string with the content, and set *LENGTH to the length of
+   the string.  The string is zero-terminated, but the terminating
+   zero byte is not counted in *LENGTH.  On errors, *LENGTH is
+   undefined, errno preserves the values set by system functions (if
+   any), and NULL is returned.  */
+char *
+read_file (const char *filename, size_t *length)
+{
+  return internal_read_file (filename, length, "r");
+}
+
+/* Open (on non-POSIX systems, in binary mode) and read the contents
+   of FILENAME, and return a newly allocated string with the content,
+   and set LENGTH to the length of the string.  The string is
+   zero-terminated, but the terminating zero byte is not counted in
+   the LENGTH variable.  On errors, *LENGTH is undefined, errno
+   preserves the values set by system functions (if any), and NULL is
+   returned.  */
+char *
+read_binary_file (const char *filename, size_t *length)
+{
+  return internal_read_file (filename, length, "rb");
+}