Merge branch 'jn/notes-doc' into maint

[git.git] / compat / mingw.c

diff --git a/compat/mingw.c b/compat/mingw.c
index ab65f77ab99500d99d24a9b7266669f37bb02cb2..9a8e3365827d303c6513475726113a3952fe0040 100644 (file)
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -140,6 +140,39 @@ int mingw_open (const char *filename, int oflags, ...)
        return fd;
 }
 
+#undef write
+ssize_t mingw_write(int fd, const void *buf, size_t count)
+{
+       /*
+        * While write() calls to a file on a local disk are translated
+        * into WriteFile() calls with a maximum size of 64KB on Windows
+        * XP and 256KB on Vista, no such cap is placed on writes to
+        * files over the network on Windows XP.  Unfortunately, there
+        * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
+        * bigger writes fail on Windows XP.
+        * So we cap to a nice 31MB here to avoid write failures over
+        * the net without changing the number of WriteFile() calls in
+        * the local case.
+        */
+       return write(fd, buf, min(count, 31 * 1024 * 1024));
+}
+
+#undef fopen
+FILE *mingw_fopen (const char *filename, const char *otype)
+{
+       if (!strcmp(filename, "/dev/null"))
+               filename = "nul";
+       return fopen(filename, otype);
+}
+
+#undef freopen
+FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
+{
+       if (filename && !strcmp(filename, "/dev/null"))
+               filename = "nul";
+       return freopen(filename, otype, stream);
+}
+
 /*
  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
@@ -259,8 +292,17 @@ int mingw_utime (const char *file_name, const struct utimbuf *times)
        int fh, rc;
 
        /* must have write permission */
-       if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
-               return -1;
+       DWORD attrs = GetFileAttributes(file_name);
+       if (attrs != INVALID_FILE_ATTRIBUTES &&
+           (attrs & FILE_ATTRIBUTE_READONLY)) {
+               /* ignore errors here; open() will report them */
+               SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
+       }
+
+       if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
+               rc = -1;
+               goto revert_attrs;
+       }
 
        time_t_to_filetime(times->modtime, &mft);
        time_t_to_filetime(times->actime, &aft);
@@ -270,6 +312,13 @@ int mingw_utime (const char *file_name, const struct utimbuf *times)
        } else
                rc = 0;
        close(fh);
+
+revert_attrs:
+       if (attrs != INVALID_FILE_ATTRIBUTES &&
+           (attrs & FILE_ATTRIBUTE_READONLY)) {
+               /* ignore errors again */
+               SetFileAttributes(file_name, attrs);
+       }
        return rc;
 }
 
@@ -618,6 +667,7 @@ static int env_compare(const void *a, const void *b)
 }
 
 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
+                             const char *dir,
                              int prepend_cmd, int fhin, int fhout, int fherr)
 {
        STARTUPINFO si;
@@ -697,7 +747,7 @@ static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 
        memset(&pi, 0, sizeof(pi));
        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
-               env ? envblk.buf : NULL, NULL, &si, &pi);
+               env ? envblk.buf : NULL, dir, &si, &pi);
 
        if (env)
                strbuf_release(&envblk);
@@ -714,10 +764,11 @@ static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
                           int prepend_cmd)
 {
-       return mingw_spawnve_fd(cmd, argv, env, prepend_cmd, 0, 1, 2);
+       return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 }
 
 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
+                    const char *dir,
                     int fhin, int fhout, int fherr)
 {
        pid_t pid;
@@ -740,14 +791,14 @@ pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
                                pid = -1;
                        }
                        else {
-                               pid = mingw_spawnve_fd(iprog, argv, env, 1,
+                               pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
                                                       fhin, fhout, fherr);
                                free(iprog);
                        }
                        argv[0] = argv0;
                }
                else
-                       pid = mingw_spawnve_fd(prog, argv, env, 0,
+                       pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
                                               fhin, fhout, fherr);
                free(prog);
        }