mkstemp

3 files changed, 28 insertions, 1 deletions

diff --git a/src/library.js b/src/library.js
index 159c7087..42eb951f 100644
--- a/src/library.js
+++ b/src/library.js
@@ -1227,6 +1227,15 @@ LibraryManager.library = {
     // http://pubs.opengroup.org/onlinepubs/009695399/functions/creat.html
     return _open(path, {{{ cDefine('O_WRONLY') }}} | {{{ cDefine('O_CREAT') }}} | {{{ cDefine('O_TRUNC') }}}, allocate([mode, 0, 0, 0], 'i32', ALLOC_STACK));
   },
+  mkstemp__deps: ['creat'],
+  mkstemp: function(template) {
+    if (!_mkstemp.counter) _mkstemp.counter = 0;
+    var c = (_mkstemp.counter++).toString();
+    var rep = 'XXXXXX';
+    while (c.length < rep.length) c = '0' + c;
+    writeArrayToMemory(intArrayFromString(c), template + Pointer_stringify(template).indexOf(rep));
+    return _creat(template, 0600);
+  },
   fcntl__deps: ['$FS', '__setErrNo', '$ERRNO_CODES', '__flock_struct_layout'],
   fcntl: function(fildes, cmd, varargs, dup2) {
     // int fcntl(int fildes, int cmd, ...);
diff --git a/tests/files.cpp b/tests/files.cpp
index e1a38421..04baa151 100644
--- a/tests/files.cpp
+++ b/tests/files.cpp
@@ -1,6 +1,7 @@
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 int main()
 {
@@ -103,6 +104,23 @@ int main()
   fclose(inf);
   printf("fscanfed: %d - %s\n", number, text);
 
+  // temp files
+  const char *tname = "file_XXXXXX.txt";
+  char tname1[100];
+  char tname2[100];
+  strcpy(tname1, tname);
+  strcpy(tname2, tname);
+  assert(!strcmp(tname1, tname2)); // equal
+  int f1 = mkstemp(tname1);
+  int f2 = mkstemp(tname2);
+  assert(f1 != f2);
+  //printf("%d,%d,%s,%s\n", f1, f2, tname1, tname2);
+  assert(strcmp(tname1, tname2)); // not equal
+  assert(fopen(tname1, "r"));
+  assert(fopen(tname2, "r"));
+  assert(!fopen(tname2+1, "r")); // sanity check that we can't open just anything
+  printf("ok.\n");
+
   return 0;
 }
 
diff --git a/tests/runner.py b/tests/runner.py
index 97ec3b94..1ab5c7af 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -5021,7 +5021,7 @@ def process(filename):
       other.close()
 
       src = open(path_from_root('tests', 'files.cpp'), 'r').read()
-      self.do_run(src, 'size: 7\ndata: 100,-56,50,25,10,77,123\nloop: 100 -56 50 25 10 77 123 \ninput:hi there!\ntexto\ntexte\n$\n5 : 10,30,20,11,88\nother=some data.\nseeked=me da.\nseeked=ata.\nseeked=ta.\nfscanfed: 10 - hello\n',
+      self.do_run(src, 'size: 7\ndata: 100,-56,50,25,10,77,123\nloop: 100 -56 50 25 10 77 123 \ninput:hi there!\ntexto\ntexte\n$\n5 : 10,30,20,11,88\nother=some data.\nseeked=me da.\nseeked=ata.\nseeked=ta.\nfscanfed: 10 - hello\nok.\n',
                    post_build=post, extra_emscripten_args=['-H', 'libc/fcntl.h'])
 
     def test_files_m(self):