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

fusl/src/misc/mntent.c

Index: fusl/src/misc/mntent.c
diff --git a/fusl/src/misc/mntent.c b/fusl/src/misc/mntent.c
new file mode 100644
index 0000000000000000000000000000000000000000..a16d65254d5042df3de28ff29dc719ccecc76bc5
--- /dev/null
+++ b/fusl/src/misc/mntent.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <string.h>
+#include <mntent.h>
+#include <errno.h>
+
+FILE *setmntent(const char *name, const char *mode)
+{
+	return fopen(name, mode);
+}
+
+int endmntent(FILE *f)
+{
+	if (f) fclose(f);
+	return 1;
+}
+
+struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
+{
+	int cnt, n[8];
+
+	mnt->mnt_freq = 0;
+	mnt->mnt_passno = 0;
+
+	do {
+		fgets(linebuf, buflen, f);
+		if (feof(f) || ferror(f)) return 0;
+		if (!strchr(linebuf, '\n')) {
+			fscanf(f, "%*[^\n]%*[\n]");
+			errno = ERANGE;
+			return 0;
+		}
+		cnt = sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
+			n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
+			&mnt->mnt_freq, &mnt->mnt_passno);
+	} while (cnt < 2 || linebuf[n[0]] == '#');
+
+	linebuf[n[1]] = 0;
+	linebuf[n[3]] = 0;
+	linebuf[n[5]] = 0;
+	linebuf[n[7]] = 0;
+
+	mnt->mnt_fsname = linebuf+n[0];
+	mnt->mnt_dir = linebuf+n[2];
+	mnt->mnt_type = linebuf+n[4];
+	mnt->mnt_opts = linebuf+n[6];
+
+	return mnt;
+}
+
+struct mntent *getmntent(FILE *f)
+{
+	static char linebuf[256];
+	static struct mntent mnt;
+	return getmntent_r(f, &mnt, linebuf, sizeof linebuf);
+}
+
+int addmntent(FILE *f, const struct mntent *mnt)
+{
+	if (fseek(f, 0, SEEK_END)) return 1;
+	return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
+		mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
+		mnt->mnt_freq, mnt->mnt_passno) < 0;
+}
+
+char *hasmntopt(const struct mntent *mnt, const char *opt)
+{
+	return strstr(mnt->mnt_opts, opt);
+}