initial commit

fileops.c

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the FITSmaniplib project.
+ * Copyright 2019  Edward V. Emelianov <edward.emelianoff@gmail.com>, <eddy@sao.ru>.
+ *
+ * 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 of the License, 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 "FITSmanip.h"
+#include "local.h"
+
+/**
+ * Return TRUE if file _name_ not exists
+ */
+bool file_is_absent(char *name){
+    struct stat filestat;
+    if(!stat(name, &filestat)) return FALSE;
+    if(errno == ENOENT) return TRUE;
+    return FALSE;
+}
+/**
+ * find the first non-existing filename like prefixXXXX.suffix & put it into buff
+ */
+char* make_filename(char *buff, size_t buflen, char *prefix, char *suffix){
+    int num;
+    for(num = 1; num < 10000; ++num){
+        if(snprintf(buff, buflen, "%s_%04d.%s", prefix, num, suffix) < 1)
+            return NULL;
+        if(file_is_absent(buff)) // OK, file not exists
+            return buff;
+    }
+    return NULL;
+}