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-rw-r--r--perl-install/c/stuff.xs.pl7
1 files changed, 5 insertions, 2 deletions
diff --git a/perl-install/c/stuff.xs.pl b/perl-install/c/stuff.xs.pl
index f8bfed299..d5b711bd6 100644
--- a/perl-install/c/stuff.xs.pl
+++ b/perl-install/c/stuff.xs.pl
@@ -111,10 +111,13 @@ SV * iconv_(char* s, char* from_charset, char* to_charset) {
char* retval = s;
if (cd != (iconv_t) (-1)) {
size_t s_len = strlen(retval);
- char *buf = alloca(3 * s_len + 10); /* 10 for safety, it should not be needed */
+ /* the maximum expansion when converting happens when converting
+ tscii to utf-8; each tscii char can become up to 4 unicode chars
+ and each one of those unicode chars can be 3 bytes long */
+ char *buf = alloca(4 * 3 * s_len);
{
char *ptr = buf;
- size_t ptr_len = 3 * s_len + 10;
+ size_t ptr_len = 4 * 3 * s_len;
if ((iconv(cd, &s, &s_len, &ptr, &ptr_len)) != (size_t) (-1)) {
*ptr = 0;
retval = buf;