adding new tempfile feature

Author: dreamer-coding

code/logic/fossil/io/stream.h

@@ -278,6 +278,15 @@ int32_t fossil_fstream_delete(const char *filename);
  */
 int fossil_fstream_get_type(const char *filename);
 
+/**
+ * Create a temporary file.
+ *
+ * This function creates a temporary file and returns its name.
+ *
+ * @return A pointer to the name of the temporary file, or NULL on failure.
+ */
+fossil_fstream_t fossil_fstream_tempfile(void);
+
 /**
  * Check if a file is readable.
  *
@@ -776,6 +785,17 @@ namespace fossil {
                 return fossil_fstream_get_type(filename.c_str());
             }
 
+            /**
+             * Create a temporary file.
+             *
+             * This function creates a temporary file and returns its name.
+             *
+             * @return A pointer to the name of the temporary file, or NULL on failure.
+             */
+            static fossil_fstream_t tempfile() {
+                return fossil_fstream_tempfile();
+            }
+
             /**
              * Check if a file is readable.
              *

code/logic/stream.c

@@ -23,6 +23,9 @@
     #include <windows.h>
 #else
     #include <unistd.h>
+    #ifndef _POSIX_C_SOURCE
+    extern int mkstemp(char *);
+    #endif
     #include <fcntl.h>
 #endif
 
@@ -501,6 +504,34 @@ int32_t fossil_fstream_is_readable(const char *filename) {
 #endif
 }
 
+fossil_fstream_t fossil_fstream_tempfile(void) {
+    fossil_fstream_t temp_stream;
+    char temp_filename[FOSSIL_BUFFER_MEDIUM];
+
+#ifdef _WIN32
+    if (GetTempFileNameA(".", "fossil", 0, temp_filename) == 0) {
+        fprintf(stderr, "Error: Failed to create temporary file\n");
+        return (fossil_fstream_t){NULL, ""};
+    }
+#else
+    char template[] = "fossil_tempfile_XXXXXX";
+    int fd = mkstemp(template);
+    if (fd == -1) {
+        fprintf(stderr, "Error: Failed to create temporary file\n");
+        return (fossil_fstream_t){NULL, ""};
+    }
+    close(fd); // Close the file descriptor as it's no longer needed
+    strncpy(temp_filename, template, FOSSIL_BUFFER_MEDIUM);
+#endif
+
+    if (fossil_fstream_open(&temp_stream, temp_filename, "wb+") != FOSSIL_ERROR_OK) {
+        fprintf(stderr, "Error: Failed to open temporary file - %s\n", temp_filename);
+        return (fossil_fstream_t){NULL, ""};
+    }
+
+    return temp_stream;
+}
+
 int32_t fossil_fstream_is_writable(const char *filename) {
 #ifdef _WIN32
     DWORD attrs = GetFileAttributesA(filename);