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Fix incompatible pointers for modern C, hope that restrict qualifier
holds in this scenario
https://bugs.gentoo.org/919224
--- a/lib/localconverter.c
+++ b/lib/localconverter.c
@@ -599,12 +599,12 @@
inleft = 0;
outbuf = NULL;
outleft = 0;
- iconv(ictx, (const char **)NULL, &inleft, &outbuf, &outleft);
+ iconv(ictx, NULL, &inleft, &outbuf, &outleft);
inleft = strlen(from);
inbuf = from;
outleft = tolen - 1; /* reserve space for terminating NUL */
- sz = iconv(ictx, (const char **)&inbuf, &inleft, &to, &outleft);
+ sz = iconv(ictx, (char ** restrict)&inbuf, &inleft, &to, &outleft);
if (sz == (size_t)(-1) || inleft > 0) {
switch (errno) {
@@ -630,7 +630,7 @@
* Append a sequence of state reset.
*/
inleft = 0;
- sz = iconv(ictx, (const char **)NULL, &inleft, &to, &outleft);
+ sz = iconv(ictx, NULL, &inleft, &to, &outleft);
if (sz == (size_t)(-1)) {
switch (errno) {
case EILSEQ:
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