[Issue #169] added function slurpFileFullPath()

Author: gsmolk

src/fetch.c

@@ -13,6 +13,67 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+/*
+ * Read a file into memory.
+ * The file contents are returned in a malloc'd buffer, and *filesize
+ * is set to the length of the file.
+ *
+ * The returned buffer is always zero-terminated; the size of the returned
+ * buffer is actually *filesize + 1. That's handy when reading a text file.
+ * This function can be used to read binary files as well, you can just
+ * ignore the zero-terminator in that case.
+ *
+ */
+char *
+slurpFileFullPath(const char *from_fullpath, size_t *filesize, bool safe, fio_location location)
+{
+	int		fd;
+	char	*buffer;
+	int		len;
+	struct stat statbuf;
+
+	if ((fd = fio_open(from_fullpath, O_RDONLY | PG_BINARY, location)) == -1)
+	{
+		if (safe)
+			return NULL;
+		else
+			elog(ERROR, "Could not open file \"%s\" for reading: %s",
+					from_fullpath, strerror(errno));
+	}
+
+	if (fio_fstat(fd, &statbuf) < 0)
+	{
+		if (safe)
+			return NULL;
+		else
+			elog(ERROR, "Could not stat file \"%s\": %s",
+				from_fullpath, strerror(errno));
+	}
+
+	len = statbuf.st_size;
+
+	buffer = pg_malloc(len + 1);
+
+	if (fio_read(fd, buffer, len) != len)
+	{
+		if (safe)
+			return NULL;
+		else
+			elog(ERROR, "Could not read file \"%s\": %s\n",
+				from_fullpath, strerror(errno));
+	}
+
+	fio_close(fd);
+
+	/* Zero-terminate the buffer. */
+	buffer[len] = '\0';
+
+	if (filesize)
+		*filesize = len;
+
+	return buffer;
+}
+
 /*
  * Read a file into memory. The file to be read is <datadir>/<path>.
  * The file contents are returned in a malloc'd buffer, and *filesize