Workaround Microsoft stupidity

src/wrapsurvexport.c

@@ -50,6 +50,27 @@ main(int argc, char **argv)
     memcpy(a, argv[0], a_len);
     strcpy(a + a_len, "survexpor_.exe");
     const char *real_argv0 = argv[0];
+    // Behind the scenes it appears Microsoft's _execv() actually takes the
+    // argv passed and crudely glues it together into a command line string
+    // with spaces in between but *WITHOUT ANY ESCAPING*, and then it gets
+    // split back up into arguments at spaces, so an argument containing a
+    // space gets split into two arguments.  Coupled with the default
+    // installation directory path containing a space (C:\Program Files) this
+    // doesn't work out well.  Words fail me.
+    //
+    // Apparently putting quotes around the argument is necessary.
+    for (int i = 0; i < argc; ++i) {
+	const char *arg = argv[i];
+	if (arg[strcspn(arg, " \t\n\r\v")]) {
+	    // Argument contains whitespace.
+	    char *newarg = malloc(strlen(arg) + 3);
+	    if (!newarg) return 1;
+	    newarg[0] = '"';
+	    strcpy(newarg + 1, arg);
+	    strcat(newarg + 1, "\"");
+	    argv[i] = newarg;
+	}
+    }
     _execv(a, (const char * const*)argv);
     printf("%s: %s\n", real_argv0, strerror(errno));
     return 1;