The fifth batch

[thirdparty/git.git] / copy.c

diff --git a/copy.c b/copy.c
index 23d84c6c1db554bcc7a33804d58821dfb3fb7634..3df156f6cea04b3eed87eb396ee14a968077b4ad 100644 (file)
--- a/copy.c
+++ b/copy.c
@@ -1,6 +1,9 @@
 #include "git-compat-util.h"
 #include "copy.h"
 #include "path.h"
+#include "gettext.h"
+#include "strbuf.h"
+#include "abspath.h"
 
 int copy_fd(int ifd, int ofd)
 {
@@ -67,3 +70,61 @@ int copy_file_with_time(const char *dst, const char *src, int mode)
                return copy_times(dst, src);
        return status;
 }
+
+static int do_symlinks_match(const char *path1, const char *path2)
+{
+       struct strbuf buf1 = STRBUF_INIT, buf2 = STRBUF_INIT;
+       int ret = 0;
+
+       if (!strbuf_readlink(&buf1, path1, 0) &&
+           !strbuf_readlink(&buf2, path2, 0))
+               ret = !strcmp(buf1.buf, buf2.buf);
+
+       strbuf_release(&buf1);
+       strbuf_release(&buf2);
+       return ret;
+}
+
+int do_files_match(const char *path1, const char *path2)
+{
+       struct stat st1, st2;
+       int fd1 = -1, fd2 = -1, ret = 1;
+       char buf1[8192], buf2[8192];
+
+       if ((fd1 = open_nofollow(path1, O_RDONLY)) < 0 ||
+           fstat(fd1, &st1) || !S_ISREG(st1.st_mode)) {
+               if (fd1 < 0 && errno == ELOOP)
+                       /* maybe this is a symbolic link? */
+                       return do_symlinks_match(path1, path2);
+               ret = 0;
+       } else if ((fd2 = open_nofollow(path2, O_RDONLY)) < 0 ||
+                  fstat(fd2, &st2) || !S_ISREG(st2.st_mode)) {
+               ret = 0;
+       }
+
+       if (ret)
+               /* to match, neither must be executable, or both */
+               ret = !(st1.st_mode & 0111) == !(st2.st_mode & 0111);
+
+       if (ret)
+               ret = st1.st_size == st2.st_size;
+
+       while (ret) {
+               ssize_t len1 = read_in_full(fd1, buf1, sizeof(buf1));
+               ssize_t len2 = read_in_full(fd2, buf2, sizeof(buf2));
+
+               if (len1 < 0 || len2 < 0 || len1 != len2)
+                       ret = 0; /* read error or different file size */
+               else if (!len1) /* len2 is also 0; hit EOF on both */
+                       break; /* ret is still true */
+               else
+                       ret = !memcmp(buf1, buf2, len1);
+       }
+
+       if (fd1 >= 0)
+               close(fd1);
+       if (fd2 >= 0)
+               close(fd2);
+
+       return ret;
+}