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 COPY_READ_ERROR;
  12                 if (write_in_full(ofd, buffer, len) < 0)
  13                         return COPY_WRITE_ERROR;
  14         }
  15         return 0;
  16 }
  17
  18 static int copy_times(const char *dst, const char *src)
  19 {
  20         struct stat st;
  21         struct utimbuf times;
  22         if (stat(src, &st) < 0)
  23                 return -1;
  24         times.actime = st.st_atime;
  25         times.modtime = st.st_mtime;
  26         if (utime(dst, &times) < 0)
  27                 return -1;
  28         return 0;
  29 }
  30
  31 int copy_file(const char *dst, const char *src, int mode)
  32 {
  33         int fdi, fdo, status;
  34
  35         mode = (mode & 0111) ? 0777 : 0666;
  36         if ((fdi = open(src, O_RDONLY)) < 0)
  37                 return fdi;
  38         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  39                 close(fdi);
  40                 return fdo;
  41         }
  42         status = copy_fd(fdi, fdo);
  43         switch (status) {
  44         case COPY_READ_ERROR:
  45                 error_errno("copy-fd: read returned");
  46                 break;
  47         case COPY_WRITE_ERROR:
  48                 error_errno("copy-fd: write returned");
  49                 break;
  50         }
  51         close(fdi);
  52         if (close(fdo) != 0)
  53                 return error_errno("%s: close error", dst);
  54
  55         if (!status && adjust_shared_perm(dst))
  56                 return -1;
  57
  58         return status;
  59 }
  60
  61 int copy_file_with_time(const char *dst, const char *src, int mode)
  62 {
  63         int status = copy_file(dst, src, mode);
  64         if (!status)
  65                 return copy_times(dst, src);
  66         return status;
  67 }