new file for environment related functions

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@8476 ec53bebd-3082-4978-b11e-865c3cabbd6b
2000-06-28 12:27:38 +00:00
parent 0336129055
commit 0ade62c417
1 changed files with 98 additions and 0 deletions
--- a/appl/login/env.c
+++ b/appl/login/env.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2000 Kungliga Tekniska H<>gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include "login_locl.h"
+RCSID("$Id$");
+
+/*
+ * the environment we will send to execle and the shell.
+ */
+
+char **env;
+int num_env;
+
+void
+extend_env(char *str)
+{
+    env = realloc(env, (num_env + 1) * sizeof(*env));
+    if(env == NULL)
+	errx(1, "Out of memory!");
+    env[num_env++] = str;
+}
+
+void
+add_env(const char *var, const char *value)
+{
+    int i;
+    char *str;
+    asprintf(&str, "%s=%s", var, value);
+    if(str == NULL)
+	errx(1, "Out of memory!");
+    for(i = 0; i < num_env; i++)
+	if(strncmp(env[i], var, strlen(var)) == 0 && 
+	   env[i][strlen(var)] == '='){
+	    free(env[i]);
+	    env[i] = str;
+	    return;
+	}
+    
+    extend_env(str);
+}
+
+void
+copy_env(void)
+{
+    char **p;
+    for(p = environ; *p; p++)
+	extend_env(*p);
+}
+
+int
+login_read_env(const char *file)
+{
+    char **newenv;
+    char *p;
+    int i, j;
+    
+    newenv = NULL;
+    i = read_environment(file, &newenv);
+    for (j = 0; j < i; j++) {
+	p = strchr(newenv[j], '=');
+	*p++ = 0;
+	add_env(newenv[j], p);
+	*--p = '=';
+	free(newenv[j]);
+    }
+    free(newenv);
+    return 0;
+}