Add a "fork" of musl as //fusl.

fusl/src/stdio/getdelim.c

Index: fusl/src/stdio/getdelim.c
diff --git a/fusl/src/stdio/getdelim.c b/fusl/src/stdio/getdelim.c
new file mode 100644
index 0000000000000000000000000000000000000000..1ccd8029238987f05e183c3bfec186287dff89f0
--- /dev/null
+++ b/fusl/src/stdio/getdelim.c
@@ -0,0 +1,68 @@
+#include "stdio_impl.h"
+#include <string.h>
+#include <inttypes.h>
+#include <errno.h>
+
+#define MIN(a,b) ((a)<(b) ? (a) : (b))
+
+ssize_t getdelim(char **restrict s, size_t *restrict n, int delim, FILE *restrict f)
+{
+	char *tmp;
+	unsigned char *z;
+	size_t k;
+	size_t i=0;
+	int c;
+
+	FLOCK(f);
+
+	if (!n || !s) {
+		f->flags |= F_ERR;
+		FUNLOCK(f);
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (!*s) *n=0;
+
+	for (;;) {
+		z = memchr(f->rpos, delim, f->rend - f->rpos);
+		k = z ? z - f->rpos + 1 : f->rend - f->rpos;
+		if (i+k+1 >= *n) {
+			if (k >= SIZE_MAX/2-i) goto oom;
+			size_t m = i+k+2;
+			if (!z && m < SIZE_MAX/4) m += m/2;
+			tmp = realloc(*s, m);
+			if (!tmp) {
+				m = i+k+2;
+				tmp = realloc(*s, m);
+				if (!tmp) goto oom;
+			}
+			*s = tmp;
+			*n = m;
+		}
+		memcpy(*s+i, f->rpos, k);
+		f->rpos += k;
+		i += k;
+		if (z) break;
+		if ((c = getc_unlocked(f)) == EOF) {
+			if (!i || !feof(f)) {
+				FUNLOCK(f);
+				return -1;
+			}
+			break;
+		}
+		if (((*s)[i++] = c) == delim) break;
+	}
+	(*s)[i] = 0;
+
+	FUNLOCK(f);
+
+	return i;
+oom:
+	f->flags |= F_ERR;
+	FUNLOCK(f);
+	errno = ENOMEM;
+	return -1;
+}
+
+weak_alias(getdelim, __getdelim);