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-rw-r--r--erts/emulator/beam/utils.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index ec502d5a78..36b818505c 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -3923,6 +3923,68 @@ intlist_to_buf(Eterm list, char *buf, Sint len)
return -2; /* not enough space */
}
+/* Fill buf with the contents of the unicode list.
+ * Return the number of bytes in the buffer,
+ * or -1 for type error,
+ * or -2 for not enough buffer space (buffer contains truncated result).
+ */
+Sint
+erts_unicode_list_to_buf(Eterm list, byte *buf, Sint len)
+{
+ Eterm* listptr;
+ Sint sz = 0;
+
+ if (is_nil(list)) {
+ return 0;
+ }
+ if (is_not_list(list)) {
+ return -1;
+ }
+ listptr = list_val(list);
+
+ while (len-- > 0) {
+ Sint val;
+
+ if (is_not_small(CAR(listptr))) {
+ return -1;
+ }
+ val = signed_val(CAR(listptr));
+ if (0 <= val && val < 0x80) {
+ buf[sz] = val;
+ sz++;
+ } else if (val < 0x800) {
+ buf[sz+0] = 0xC0 | (val >> 6);
+ buf[sz+1] = 0x80 | (val & 0x3F);
+ sz += 2;
+ } else if (val < 0x10000UL) {
+ if (0xD800 <= val && val <= 0xDFFF) {
+ return -1;
+ }
+ buf[sz+0] = 0xE0 | (val >> 12);
+ buf[sz+1] = 0x80 | ((val >> 6) & 0x3F);
+ buf[sz+2] = 0x80 | (val & 0x3F);
+ sz += 3;
+ } else if (val < 0x110000) {
+ buf[sz+0] = 0xF0 | (val >> 18);
+ buf[sz+1] = 0x80 | ((val >> 12) & 0x3F);
+ buf[sz+2] = 0x80 | ((val >> 6) & 0x3F);
+ buf[sz+3] = 0x80 | (val & 0x3F);
+ sz += 4;
+ } else {
+ return -1;
+ }
+ list = CDR(listptr);
+ if (is_nil(list)) {
+ return sz;
+ }
+ if (is_not_list(list)) {
+ return -1;
+ }
+ listptr = list_val(list);
+ }
+ return -2; /* not enough space */
+}
+
/*
** Convert an integer to a byte list
** return pointer to converted stuff (need not to be at start of buf!)