1 files changed, 59 insertions, 0 deletions
diff --git a/src/charconv.c b/src/charconv.c
new file mode 100644
index 0000000..e869e41
--- /dev/null
+++ b/src/charconv.c
@@ -0,0 +1,59 @@
+#include "charconv.h"
+#include <iconv.h>
+#include <langinfo.h>
+#include <locale.h>
+#include <stdio.h>
+
+static iconv_t iconv_init_codepage(int codepage)
+{
+    iconv_t result;
+    char codepage_name[16];
+    snprintf(codepage_name, sizeof(codepage_name), "CP%d", codepage);
+    result = iconv_open(nl_langinfo(CODESET), codepage_name);
+    if (result == (iconv_t) - 1)
+	perror(codepage_name);
+    return result;
+}
+
+static iconv_t dos_to_local;
+
+/*
+ * Initialize conversion from codepage.
+ * codepage = -1 means default codepage.
+ * Returns 0 on success, non-zero on failure
+ */
+static int init_conversion(int codepage)
+{
+    static int initialized = -1;
+    if (initialized < 0) {
+	initialized = 1;
+	if (codepage < 0)
+	    codepage = DEFAULT_DOS_CODEPAGE;
+	setlocale(LC_ALL, "");	/* initialize locale */
+	dos_to_local = iconv_init_codepage(codepage);
+	if (dos_to_local == (iconv_t) - 1 && codepage != DEFAULT_DOS_CODEPAGE) {
+	    printf("Trying to set fallback DOS codepage %d\n",
+		   DEFAULT_DOS_CODEPAGE);
+	    dos_to_local = iconv_init_codepage(DEFAULT_DOS_CODEPAGE);
+	    if (dos_to_local == (iconv_t) - 1)
+		initialized = 0;	/* no conversion available */
+	}
+    }
+    return initialized;
+}
+
+int set_dos_codepage(int codepage)
+{
+    return init_conversion(codepage);
+}
+
+int dos_char_to_printable(char **p, unsigned char c)
+{
+    char in[1] = { c };
+    char *pin = in;
+    size_t bytes_in = 1;
+    size_t bytes_out = 4;
+    if (!init_conversion(-1))
+	return 0;
+    return iconv(dos_to_local, &pin, &bytes_in, p, &bytes_out) != -1;
+}