3687 fopen() O_CLOEXEC support via the "e" flag

@@ -25,11 +25,11 @@
  */
 
 /*      Copyright (c) 1988 AT&T */
 /*        All Rights Reserved   */
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
+/* Copyright (c) 2013 OmniTI Computer Consulting, Inc. All rights reserved. */
 
 /*
  *      This routine is a special case, in that it is aware of
  *      both small and large file interfaces. It must be built
  *      in the small compilation environment.

@@ -53,12 +53,12 @@
  */
 
 FILE *
 _endopen(const char *name, const char *type, FILE *iop, int largefile)
 {
-        int oflag, fd, fflag;
-        char plus;
+        int oflag, fd, fflag, eflag, plusflag;
+        const char *echr;
 
         if (iop == NULL)
                 return (NULL);
         switch (type[0]) {
         default:

@@ -75,14 +75,31 @@
         case 'a':
                 oflag = O_WRONLY | O_APPEND | O_CREAT;
                 fflag = _IOWRT;
                 break;
         }
+
+        plusflag = 0;
+        eflag = 0;
+        for (echr = type + 1; *echr != '\0'; echr++) {
+                switch (*echr) {
         /* UNIX ignores 'b' and treats text and binary the same */
-        if ((plus = type[1]) == 'b')
-                plus = type[2];
-        if (plus == '+') {
+                default:
+                        break;
+                case '+':
+                        plusflag = 1;
+                        break;
+                case 'e':
+                        eflag = 1;
+                        break;
+                }
+        }
+        if (eflag) {
+                /* Subsequent to a mode flag, 'e' indicates O_CLOEXEC */
+                oflag = oflag | O_CLOEXEC;
+        }
+        if (plusflag) {
                 oflag = (oflag & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
                 fflag = _IORW;
         }
 
         /* select small or large file open based on flag */