From f7dfab9e35ee4e70b29b1dffb466c9727f0a0a16 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Sat, 6 Dec 2025 05:20:57 -0500
Subject: alf: Allow setting the Atari filename with file=FILE.

---
 CHANGES.txt |  1 +
 TODO.txt    |  2 --
 src/alf.c   | 28 +++++++++++++++++++---------
 3 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/CHANGES.txt b/CHANGES.txt
index 3b622d6..bf1156a 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,6 @@
 0.4.0:
 - alf and unalf now detect duplicate Atari filenames.
+- alf lets the user set the archive filename for each file (file=FILE, e.g.)
 - unalf can extract by file number (-n) rather than wildcards.
 - unalf can split an ALF file into multiple ALF files (-s option)
   without extracting.
diff --git a/TODO.txt b/TODO.txt
index 48ec376..452a435 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -1,5 +1,3 @@
-- maybe: alf foo.alf unix.filename=ATARI.NAM  ...unalf could use this too.
-
 - fuzz alf and unalf with afl++ or similar. this is a work in progress,
   fuzzing takes a long time.
 
diff --git a/src/alf.c b/src/alf.c
index d485ab1..0d150bd 100644
--- a/src/alf.c
+++ b/src/alf.c
@@ -32,7 +32,8 @@ struct stat in_file_stat;
 long hdr_compsize_pos;
 
 FILE *out_file, *in_file;
-const char *out_filename, *in_filename;
+const char *out_filename, *atari_filename;
+char in_filename[PATH_MAX + 1];
 
 char hdr_filename[13];
 
@@ -66,11 +67,11 @@ void atarify_filename(char *result) {
 	int i;
 	char name[9] = { 0 }, ext[4] = { 0 }, *p;
 
-	p = strrchr(in_filename, '/');
+	p = strrchr(atari_filename, '/');
 	if(p)
 		p++;
 	else
-		p = (char *)in_filename;
+		p = (char *)atari_filename;
 
 	strncpy(name, p, 8);
 	for(i = 0; i < 8; i++) {
@@ -152,8 +153,7 @@ void update_header(void) {
 	store_quad(15, output_len - 29);
 }
 
-void open_input(const char *filename) {
-	in_filename = filename;
+void open_input(void) {
 	if(!(in_file = fopen(in_filename, "rb"))) {
 		perror(in_filename);
 		exit(1);
@@ -180,14 +180,24 @@ void convert_eols(void) {
 	}
 }
 
-void crunch_file(const char *filename) {
-	open_input(filename);
+void crunch_file(const char *filename_arg) {
+	strncpy(in_filename, filename_arg, PATH_MAX);
+
+	/* 1st strtok() returns in_filename itself, whether or not there's an "=",
+	   *and* changes the '=' to '\0' if there is one. */
+	strtok(in_filename, "=");
+	/* 2nd returns everything after the "=", if there is one (or null if not, *or*
+	   if it's the last char of the string) */
+	atari_filename = strtok(NULL, "=");
+	if(!atari_filename) atari_filename = in_filename;
+
+	open_input();
 
 	/* read in entire input, couldn't do it this way on the Atari */
 	input_len = fread(input_buf, 1, MAX_INPUT_SIZE - 1, in_file);
 
 	if(!feof(in_file)) {
-		fprintf(stderr, "%s: %s: this file is too large; only compressing the first 16MB.\n", self, filename);
+		fprintf(stderr, "%s: %s: this file is too large; only compressing the first 16MB.\n", self, in_filename);
 	}
 
 	if(opt_txtconv)
@@ -201,7 +211,7 @@ void crunch_file(const char *filename) {
 
 	create_header();
 	if(opt_verbose) {
-		printf("Crunching %s as %s", filename, hdr_filename);
+		printf("Crunching %s as %s", in_filename, hdr_filename);
 	} else {
 		printf("Crunching %s", hdr_filename);
 	}
-- 
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