Add file module with calls for daily file operations

file.c

@@ -0,0 +1,85 @@
+/******************************************************************************
+ *
+ *                Copyright (c) 2017-2019 by Löwenware Ltd
+ *             Please, refer LICENSE file for legal information
+ *
+ ******************************************************************************/
+
+/**
+ * @file file.c
+ * @author Ilja Kartašov <ik@lowenware.com>
+ * @brief 
+ *
+ * @see https://lowenware.com/
+ */
+#include <stdio.h>
+#include <sys/sendfile.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include <sys/stat.h>
+#include "file.h"
+
+
+bool
+cstuff_file_exists(const char *file)
+{
+	return ( access( file, F_OK ) != -1 ) ? true : false;
+}
+
+
+CStuffRetcode
+cstuff_file_copy(const char *src, const char *dest)
+{
+	CStuffRetcode rc = CSTUFF_SYSCALL_ERROR;
+	int fd_src = open(src, O_RDWR), fd_dest, len;
+	struct stat src_stat;
+
+	if (!(fd_src < 0)) {
+		if (lockf(fd_src, F_LOCK, 0) != -1) {
+			if (!stat(src, &src_stat)) {
+				fd_dest = open(dest, O_CREAT | O_WRONLY | O_TRUNC);
+				if (!(fd_dest < 0)) {
+					len = sendfile(fd_dest, fd_src, NULL, src_stat.st_size);
+					if (len == src_stat.st_size) {
+						rc = CSTUFF_SUCCESS;
+					} else {
+						fprintf(stderr, "sendfile error (%d != %d): %s\n", len,
+								(int)src_stat.st_size, strerror(errno));
+					}
+					close(fd_dest);
+				} else {
+					fprintf(stderr, "dest open() error\n");
+				}
+			} else {
+				fprintf(stderr, "src stat() error\n");
+			}
+			if (lockf(fd_src, F_TEST, 0) == 0){
+				lockf(fd_src, F_ULOCK, 0);
+			}
+		} else {
+			fprintf(stderr, "src lockf() error\n");
+		}
+		close(fd_src);
+	} else {
+		fprintf(stderr, "src open() error\n");
+	}
+	return rc;
+}
+
+
+CStuffRetcode
+cstuff_file_move(const char *src, const char *dest)
+{
+	CStuffRetcode rc;
+
+	if (!(rc = cstuff_file_copy(src, dest))) {
+		if (unlink(src) != 0)
+			return CSTUFF_SYSCALL_ERROR;
+	}
+
+	return rc;
+}

file.h

@@ -0,0 +1,35 @@
+/******************************************************************************
+ *
+ *                Copyright (c) 2017-2019 by Löwenware Ltd
+ *             Please, refer LICENSE file for legal information
+ *
+ ******************************************************************************/
+
+/**
+ * @file file.h
+ * @author Ilja Kartašov <ik@lowenware.com>
+ * @brief 
+ *
+ * @see https://lowenware.com/
+ */
+
+#ifndef CSTUFF_FILE_H_3C3D5EDC_A624_4550_98A4_29AD5A41301D
+#define CSTUFF_FILE_H_3C3D5EDC_A624_4550_98A4_29AD5A41301D
+
+#include <stdbool.h>
+#include "retcode.h"
+
+
+bool
+cstuff_file_exists(const char *file);
+
+
+CStuffRetcode
+cstuff_file_copy(const char *src, const char *dest);
+
+
+CStuffRetcode
+cstuff_file_move(const char *src, const char *dest);
+
+
+#endif /* !FILE_H */