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-rw-r--r--copy.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/copy.c b/copy.c
new file mode 100644
index 0000000..4de6a11
--- /dev/null
+++ b/copy.c
@@ -0,0 +1,67 @@
+#include "cache.h"
+
+int copy_fd(int ifd, int ofd)
+{
+ while (1) {
+ char buffer[8192];
+ ssize_t len = xread(ifd, buffer, sizeof(buffer));
+ if (!len)
+ break;
+ if (len < 0)
+ return COPY_READ_ERROR;
+ if (write_in_full(ofd, buffer, len) < 0)
+ return COPY_WRITE_ERROR;
+ }
+ return 0;
+}
+
+static int copy_times(const char *dst, const char *src)
+{
+ struct stat st;
+ struct utimbuf times;
+ if (stat(src, &st) < 0)
+ return -1;
+ times.actime = st.st_atime;
+ times.modtime = st.st_mtime;
+ if (utime(dst, &times) < 0)
+ return -1;
+ return 0;
+}
+
+int copy_file(const char *dst, const char *src, int mode)
+{
+ int fdi, fdo, status;
+
+ mode = (mode & 0111) ? 0777 : 0666;
+ if ((fdi = open(src, O_RDONLY)) < 0)
+ return fdi;
+ if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
+ close(fdi);
+ return fdo;
+ }
+ status = copy_fd(fdi, fdo);
+ switch (status) {
+ case COPY_READ_ERROR:
+ error_errno("copy-fd: read returned");
+ break;
+ case COPY_WRITE_ERROR:
+ error_errno("copy-fd: write returned");
+ break;
+ }
+ close(fdi);
+ if (close(fdo) != 0)
+ return error_errno("%s: close error", dst);
+
+ if (!status && adjust_shared_perm(dst))
+ return -1;
+
+ return status;
+}
+
+int copy_file_with_time(const char *dst, const char *src, int mode)
+{
+ int status = copy_file(dst, src, mode);
+ if (!status)
+ return copy_times(dst, src);
+ return status;
+}