Fix the MS-Windows build broken by SAFE_ALLOCA changes.

 src/callproc.c (child_setup) [WINDOWSNT]: Don't call exec_failed if
 'alloca' gets passed arguments larger than MAX_ALLOCA.
 src/font.c (MAX): Define if not defined elsewhere.

1 files changed, 13 insertions, 1 deletions

diff --git a/src/callproc.c b/src/callproc.c
index 0636571b26c..271743021b6 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -1213,8 +1213,13 @@ child_setup (int in, int out, int err, char **new_argv, bool set_pgrp,
        on that.  */
     pwd_var = xmalloc (i + 5);
 #else
+    /* WINDOWSNT doesn't define exec_failed, and doesn't need this
+       test, since a directory name cannot be longer than 260
+       characters, i.e. 260 * 4 = 1040 UTF-8 bytes.  */
+#ifndef WINDOWSNT
     if (MAX_ALLOCA - 5 < i)
       exec_failed (new_argv[0], ENOMEM);
+#endif
     pwd_var = alloca (i + 5);
 #endif
     temp = pwd_var + 4;
@@ -1281,8 +1286,10 @@ child_setup (int in, int out, int err, char **new_argv, bool set_pgrp,
       }
 
     /* new_length + 2 to include PWD and terminating 0.  */
+#ifndef WINDOWSNT
     if (MAX_ALLOCA / sizeof *env - 2 < new_length)
       exec_failed (new_argv[0], ENOMEM);
+#endif
     env = new_env = alloca ((new_length + 2) * sizeof *env);
     /* If we have a PWD envvar, pass one down,
        but with corrected value.  */
@@ -1291,9 +1298,14 @@ child_setup (int in, int out, int err, char **new_argv, bool set_pgrp,
 
     if (STRINGP (display))
       {
+        char *vdata;
+
+        /* WINDOWSNT doesn't have $DISPLAY.  */
+#ifndef WINDOWSNT
         if (MAX_ALLOCA - sizeof "DISPLAY=" < SBYTES (display))
           exec_failed (new_argv[0], ENOMEM);
-        char *vdata = alloca (sizeof "DISPLAY=" + SBYTES (display));
+#endif
+        vdata = alloca (sizeof "DISPLAY=" + SBYTES (display));
         strcpy (vdata, "DISPLAY=");
         strcat (vdata, SSDATA (display));
         new_env = add_env (env, new_env, vdata);