wasip2: Adjust error code on invalid utf-8 (WebAssembly#665)

alexcrichton · web-flow · commit 190651bd6edd · 2025-11-12T18:20:02.000+01:00
Use `EILSEQ` instead of `ENOENT` to match behavior of WASIp1.
diff --git a/libc-bottom-half/sources/wasip2_file_utils.c b/libc-bottom-half/sources/wasip2_file_utils.c
@@ -74,7 +74,7 @@ static int validate_utf8(const char *ptr_signed) {
 int wasip2_string_from_c(const char *s, wasip2_string_t *out) {
   int len = validate_utf8(s);
   if (len < 0) {
-    errno = ENOENT;
+    errno = EILSEQ;
     return -1;
   }
   out->ptr = (uint8_t*) s;

Original file line number	Diff line number	Diff line change
`@@ -74,7 +74,7 @@ static int validate_utf8(const char *ptr_signed) {`
`74`	`74`	`int wasip2_string_from_c(const char s, wasip2_string_t out) {`
`75`	`75`	`int len = validate_utf8(s);`
`76`	`76`	`if (len < 0) {`
`77`		`- errno = ENOENT;`
	`77`	`+ errno = EILSEQ;`
`78`	`78`	`return -1;`
`79`	`79`	`}`
`80`	`80`	`out->ptr = (uint8_t*) s;`