copy.c

   1 #include "cache.h"
   2 #include "copy.h"
   3 #include "wrapper.h"
   4
   5 int copy_fd(int ifd, int ofd)
   6 {
   7         while (1) {
   8                 char buffer[8192];
   9                 ssize_t len = xread(ifd, buffer, sizeof(buffer));
  10                 if (!len)
  11                         break;
  12                 if (len < 0)
  13                         return COPY_READ_ERROR;
  14                 if (write_in_full(ofd, buffer, len) < 0)
  15                         return COPY_WRITE_ERROR;
  16         }
  17         return 0;
  18 }
  19
  20 static int copy_times(const char *dst, const char *src)
  21 {
  22         struct stat st;
  23         struct utimbuf times;
  24         if (stat(src, &st) < 0)
  25                 return -1;
  26         times.actime = st.st_atime;
  27         times.modtime = st.st_mtime;
  28         if (utime(dst, &times) < 0)
  29                 return -1;
  30         return 0;
  31 }
  32
  33 int copy_file(const char *dst, const char *src, int mode)
  34 {
  35         int fdi, fdo, status;
  36
  37         mode = (mode & 0111) ? 0777 : 0666;
  38         if ((fdi = open(src, O_RDONLY)) < 0)
  39                 return fdi;
  40         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  41                 close(fdi);
  42                 return fdo;
  43         }
  44         status = copy_fd(fdi, fdo);
  45         switch (status) {
  46         case COPY_READ_ERROR:
  47                 error_errno("copy-fd: read returned");
  48                 break;
  49         case COPY_WRITE_ERROR:
  50                 error_errno("copy-fd: write returned");
  51                 break;
  52         }
  53         close(fdi);
  54         if (close(fdo) != 0)
  55                 return error_errno("%s: close error", dst);
  56
  57         if (!status && adjust_shared_perm(dst))
  58                 return -1;
  59
  60         return status;
  61 }
  62
  63 int copy_file_with_time(const char *dst, const char *src, int mode)
  64 {
  65         int status = copy_file(dst, src, mode);
  66         if (!status)
  67                 return copy_times(dst, src);
  68         return status;
  69 }