Remove list.h.

[osl.git] / fd.c

diff --git a/fd.c b/fd.c
index b889d9d2144a4ad78cf6442997d80fec643aad87..0dc3f2971656db4d497b8f28516270ff361c9679 100644 (file)
--- a/fd.c
+++ b/fd.c
@@ -15,6 +15,7 @@
 #include "log.h"
 #include "osl.h"
 #include "error.h"
+#include "fd.h"
 
 /**
  * Wrapper for the write system call.
@@ -117,86 +118,6 @@ out:
        return ret;
 }
 
-/**
- * Wrapper for chdir(2).
- *
- * \param path The specified directory.
- *
- * \return Standard.
- */
-static int para_chdir(const char *path)
-{
-       int ret = chdir(path);
-
-       if (ret >= 0)
-               return 1;
-       return -ERRNO_TO_ERROR(errno);
-}
-
-/**
- * Save the cwd and open a given directory.
- *
- * \param dirname Path to the directory to open.
- * \param dir Result pointer.
- * \param cwd File descriptor of the current working directory.
- *
- * \return Standard.
- *
- * Opening the current directory (".") and calling fchdir() to return is
- * usually faster and more reliable than saving cwd in some buffer and calling
- * chdir() afterwards.
- *
- * If \a cwd is not \p NULL "." is opened and the resulting file descriptor is
- * stored in \a cwd. If the function returns success, and \a cwd is not \p
- * NULL, the caller must close this file descriptor (probably after calling
- * fchdir(*cwd)).
- *
- * On errors, the function undos everything, so the caller needs neither close
- * any files, nor change back to the original working directory.
- *
- * \sa getcwd(3).
- *
- */
-int para_opendir(const char *dirname, DIR **dir, int *cwd)
-{
-       int ret;
-
-       if (cwd) {
-               ret = osl_open(".", O_RDONLY, 0);
-               if (ret < 0)
-                       return ret;
-               *cwd = ret;
-       }
-       ret = para_chdir(dirname);
-       if (ret < 0)
-               goto close_cwd;
-       *dir = opendir(".");
-       if (*dir)
-               return 1;
-       ret = -ERRNO_TO_ERROR(errno);
-/* Ignore return value of fchdir() and close(). We're busted anyway. */
-       if (cwd)
-               fchdir(*cwd);
-close_cwd:
-       if (cwd)
-               close(*cwd);
-       return ret;
-}
-
-/**
- * A wrapper for fchdir().
- *
- * \param fd An open file descriptor.
- *
- * \return Standard.
- */
-int para_fchdir(int fd)
-{
-       if (fchdir(fd) < 0)
-               return -ERRNO_TO_ERROR(errno);
-       return 1;
-}
-
 /**
  * Open a file and map it into memory.
  *
@@ -322,3 +243,30 @@ __must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
        return p;
 }
 
+/**
+ * A wrapper for truncate(2)
+ *
+ * \param path Name of the regular file to truncate
+ * \param size Number of bytes to \b shave \b off
+ *
+ * Truncate the regular file named by \a path by \a size bytes.
+ *
+ * \return Standard.
+ *
+ * \sa truncate(2)
+ */
+int truncate_file(const char *path, off_t size)
+{
+       int ret;
+       struct stat statbuf;
+
+       ret = osl_stat(path, &statbuf);
+       if (ret < 0)
+               return ret;
+       ret = -E_OSL_BAD_SIZE;
+       if (statbuf.st_size < size)
+               return ret;
+       if (truncate(path, statbuf.st_size - size) < 0)
+               return -ERRNO_TO_ERROR(errno);
+       return 1;
+}