[PATCH 2 of 2] osutil.c: replace alloca() with malloc() and remove <alloca.h>

[Giorgos Keramidas]

# HG changeset patch
# User Giorgos Keramidas <keramida at ceid.upatras.gr>
# Date 1191783522 -10800
# Node ID 5d13d2d3f42bc150f711bfa3a8bb38a7d0b5c1d4
# Parent  37dc732e00416a50dcc9b994961acdb6ceb755ba
osutil.c: replace alloca() with malloc() and remove <alloca.h>

The <alloca.h> header is not really portable, and it breaks Mercurial on
FreeBSD.  Remove the dependency on <alloca.h> and alloca() by replacing
the only place where it was used with malloc().

diff --git a/mercurial/osutil.c b/mercurial/osutil.c
--- a/mercurial/osutil.c
+++ b/mercurial/osutil.c
@@ -9,7 +9,6 @@
 
 #define _ATFILE_SOURCE
 #include <Python.h>
-#include <alloca.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <string.h>
@@ -116,7 +115,7 @@ static PyObject *listdir(PyObject *self,
     PyObject *list = NULL;
     PyObject *ctor_args = NULL;
     int all_kinds = 1;
-    char *full_path;
+    char *full_path = NULL;
     int path_len;
     int do_stat;
     char *path;
@@ -141,7 +140,7 @@ static PyObject *listdir(PyObject *self,
     if ((list = PyList_New(0)) == NULL)
         goto bail;
 
-    full_path = alloca(path_len + PATH_MAX + 2);
+    full_path = malloc(path_len + PATH_MAX + 2);
     memcpy(full_path, path, path_len);
     full_path[path_len] = '/';
 
@@ -303,6 +302,7 @@ done:
     if (dir)
         closedir(dir);
 
+    free(full_path);
     return list;
 }