copy.c

   1 #include "cache.h"
   2
   3 int copy_fd(int ifd, int ofd)
   4 {
   5         while (1) {
   6                 char buffer[8192];
   7                 ssize_t len = xread(ifd, buffer, sizeof(buffer));
   8                 if (!len)
   9                         break;
  10                 if (len < 0) {
  11                         return error("copy-fd: read returned %s",
  12                                      strerror(errno));
  13                 }
  14                 if (write_in_full(ofd, buffer, len) < 0)
  15                         return error("copy-fd: write returned %s",
  16                                      strerror(errno));
  17         }
  18         return 0;
  19 }
  20
  21 static int copy_times(const char *dst, const char *src)
  22 {
  23         struct stat st;
  24         struct utimbuf times;
  25         if (stat(src, &st) < 0)
  26                 return -1;
  27         times.actime = st.st_atime;
  28         times.modtime = st.st_mtime;
  29         if (utime(dst, &times) < 0)
  30                 return -1;
  31         return 0;
  32 }
  33
  34 int copy_file(const char *dst, const char *src, int mode)
  35 {
  36         int fdi, fdo, status;
  37
  38         mode = (mode & 0111) ? 0777 : 0666;
  39         if ((fdi = open(src, O_RDONLY)) < 0)
  40                 return fdi;
  41         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  42                 close(fdi);
  43                 return fdo;
  44         }
  45         status = copy_fd(fdi, fdo);
  46         close(fdi);
  47         if (close(fdo) != 0)
  48                 return error("%s: close error: %s", dst, strerror(errno));
  49
  50         if (!status && adjust_shared_perm(dst))
  51                 return -1;
  52
  53         return status;
  54 }
  55
  56 int copy_file_with_time(const char *dst, const char *src, int mode)
  57 {
  58         int status = copy_file(dst, src, mode);
  59         if (!status)
  60                 return copy_times(dst, src);
  61         return status;
  62 }