math: avoid runtime conversions of floating-point constants

[musl] / src / stat / utimensat.c

diff --git a/src/stat/utimensat.c b/src/stat/utimensat.c
index b9b02ad..730723a 100644 (file)
--- a/src/stat/utimensat.c
+++ b/src/stat/utimensat.c
@@ -1,7 +1,60 @@
 #include <sys/stat.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#include <errno.h>
 #include "syscall.h"
 
+#define IS32BIT(x) !((x)+0x80000000ULL>>32)
+#define NS_SPECIAL(ns) ((ns)==UTIME_NOW || (ns)==UTIME_OMIT)
+
 int utimensat(int fd, const char *path, const struct timespec times[2], int flags)
 {
-       return syscall4(__NR_utimensat, fd, (long)path, (long)times, flags);
+       int r;
+       if (times && times[0].tv_nsec==UTIME_NOW && times[1].tv_nsec==UTIME_NOW)
+               times = 0;
+#ifdef SYS_utimensat_time64
+       r = -ENOSYS;
+       time_t s0=0, s1=0;
+       long ns0=0, ns1=0;
+       if (times) {
+               ns0 = times[0].tv_nsec;
+               ns1 = times[1].tv_nsec;
+               if (!NS_SPECIAL(ns0)) s0 = times[0].tv_sec;
+               if (!NS_SPECIAL(ns1)) s1 = times[1].tv_sec;
+       }
+       if (SYS_utimensat == SYS_utimensat_time64 || !IS32BIT(s0) || !IS32BIT(s1))
+               r = __syscall(SYS_utimensat_time64, fd, path, times ?
+                       ((long long[]){s0, ns0, s1, ns1}) : 0, flags);
+       if (SYS_utimensat == SYS_utimensat_time64 || r!=-ENOSYS)
+               return __syscall_ret(r);
+       if (!IS32BIT(s0) || !IS32BIT(s1))
+               return __syscall_ret(-ENOTSUP);
+       r = __syscall(SYS_utimensat, fd, path,
+               times ? ((long[]){s0, ns0, s1, ns1}) : 0, flags);
+#else
+       r = __syscall(SYS_utimensat, fd, path, times, flags);
+#endif
+
+#ifdef SYS_futimesat
+       if (r != -ENOSYS || flags) return __syscall_ret(r);
+       long *tv=0, tmp[4];
+       if (times) {
+               int i;
+               tv = tmp;
+               for (i=0; i<2; i++) {
+                       if (times[i].tv_nsec >= 1000000000ULL) {
+                               if (NS_SPECIAL(times[i].tv_nsec))
+                                       return __syscall_ret(-ENOSYS);
+                               return __syscall_ret(-EINVAL);
+                       }
+                       tmp[2*i+0] = times[i].tv_sec;
+                       tmp[2*i+1] = times[i].tv_nsec / 1000;
+               }
+       }
+
+       r = __syscall(SYS_futimesat, fd, path, tv);
+       if (r != -ENOSYS || fd != AT_FDCWD) return __syscall_ret(r);
+       r = __syscall(SYS_utimes, path, tv);
+#endif
+       return __syscall_ret(r);
 }