here_doc: generate random filenames

src/executing/here_doc/here_doc.c

@@ -6,8 +6,52 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/03/07 11:42:29 by khais             #+#    #+#             */
-/*   Updated: 2025/03/07 11:42:36 by khais            ###   ########.fr       */
+/*   Updated: 2025/03/11 11:22:54 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "here_doc.h"
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "../../ft_errno.h"
+#include "../../buffer/buffer.h"
+#include "libft/libft.h"
+
+/*
+** Genereate a random filename for use by here_doc
+**
+** The filename will be of the form
+** /tmp/minishell_here_doc_XXXXXXXXXXX
+** where each X is a random alphanumerical char
+**
+** Random bytes are generated by reading from /dev/urandom
+**
+** Return NULL and sets ft_errno on error
+*/
+char	*here_doc_random_filename(void)
+{
+	int			randomfd;
+	char		buf[1];
+	t_buffer	*filename;
+
+	randomfd = open("/dev/urandom", O_RDONLY);
+	if (randomfd < 0)
+		return (ft_errno(FT_EERRNO), NULL);
+	filename = ft_buffer_new();
+	if (filename == NULL)
+		return (close(randomfd), ft_errno(FT_EERRNO), NULL);
+	filename = ft_buffer_push_buf(filename, "/tmp/minishell_here_doc_", 24);
+	while (filename->length < 35)
+	{
+		if (read(randomfd, buf, 1) != 1)
+		{
+			ft_buffer_free(filename);
+			return (close(randomfd), ft_errno(FT_EERRNO), NULL);
+		}
+		if (ft_isalnum(buf[0]))
+			filename = ft_buffer_pushchar(filename, buf[0]);
+	}
+	close(randomfd);
+	return (ft_buffer_to_charptr(filename));
+}

src/executing/here_doc/here_doc.h

@@ -6,13 +6,13 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/03/07 11:41:27 by khais             #+#    #+#             */
-/*   Updated: 2025/03/07 11:42:19 by khais            ###   ########.fr       */
+/*   Updated: 2025/03/11 10:58:19 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef HERE_DOC_H
 # define HERE_DOC_H
 
-# include "../../parser/worddesc/worddesc.h"
+char	*here_doc_random_filename(void);
 
 #endif // HERE_DOC_H

tests/test_here_doc.c

@@ -6,7 +6,7 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/03/07 11:43:32 by khais             #+#    #+#             */
-/*   Updated: 2025/03/10 18:21:43 by khais            ###   ########.fr       */
+/*   Updated: 2025/03/10 18:23:36 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,6 +14,27 @@
 #include "testutil.h"
 #include "libft.h"
 #include <unistd.h>
+#include "../src/executing/here_doc/here_doc.h"
+
+static void	test_here_doc_filename_generation(void)
+{
+	char	*filename1;
+	char	*filename2;
+
+	ft_dprintf(STDERR_FILENO, "==> %s <==\n", __FUNCTION__);
+	filename1 = here_doc_random_filename();
+	filename2 = here_doc_random_filename();
+	assert(filename1 != NULL);
+	assert(filename2 != NULL);
+	ft_dprintf(STDERR_FILENO, "Got filename: [%s]\n", filename1);
+	ft_dprintf(STDERR_FILENO, "Got filename: [%s]\n", filename2);
+	assert(ft_strcmp(filename1, filename2) != 0);
+	free(filename1);
+	free(filename2);
+	do_leak_check();
+}
+
 int main(void) {
+	test_here_doc_filename_generation();
 	return (0);
 }