copy.c

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