alf and unalf: Detect dup Atari filenames.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/dupname.c b/src/dupname.c
new file mode 100644
index 0000000..532e14c
--- /dev/null
+++ b/src/dupname.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+/* only check this many filenames */
+#define MAX_FNAMES 1024
+
+/* FILENAME.EXT\0 = 13 */
+#define FNAME_LEN 13
+
+// #define DUPNAME_DEBUG
+
+static char filenames[MAX_FNAMES][FNAME_LEN];
+static int fncount;
+
+/* linear search, slow, but only happens once at startup */
+int is_dup_filename(const char *newname) {
+	int i;
+
+	for(i = 0; i < fncount; i++)
+		if(strncmp(newname, filenames[i], FNAME_LEN - 1) == 0)
+			return 1;
+
+	strncpy(filenames[fncount++], newname, FNAME_LEN - 1);
+
+	return 0;
+}
+
+#ifdef DUPNAME_DEBUG
+int main(int argc, char **argv) {
+	int i;
+
+	while(++argv, --argc)
+		printf("%s: %d\n", *argv, is_dup_filename(*argv));
+
+	printf("filenames[]\n");
+
+	for(i = 0; i < fncount; i++)
+		printf("   %s\n", filenames[i]);
+
+	return 0;
+}
+#endif