1 files changed, 121 insertions, 0 deletions

diff --git a/src/lib/libc/stdlib/setenv.c b/src/lib/libc/stdlib/setenv.c
new file mode 100644
index 0000000000..fc7c67a5db
--- /dev/null
+++ b/src/lib/libc/stdlib/setenv.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 1987 Regents of the University of California.
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *rcsid = "$OpenBSD: setenv.c,v 1.4 2001/07/09 06:57:45 deraadt Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * setenv --
+ *      Set the value of the environmental variable "name" to be
+ *      "value".  If rewrite is set, replace any current value.
+ */
+int
+setenv(name, value, rewrite)
+        register const char *name;
+        register const char *value;
+        int rewrite;
+{
+        extern char **environ;
+        static int alloced;                     /* if allocated space before */
+        register char *C;
+        int l_value, offset;
+        char *__findenv();
+
+        if (*value == '=')                      /* no `=' in value */
+                ++value;
+        l_value = strlen(value);
+        if ((C = __findenv(name, &offset))) {   /* find if already exists */
+                if (!rewrite)
+                        return (0);
+                if (strlen(C) >= l_value) {     /* old larger; copy over */
+                        while ((*C++ = *value++))
+                                ;
+                        return (0);
+                }
+        } else {                                        /* create new slot */
+                register int    cnt;
+                register char   **P;
+
+                for (P = environ, cnt = 0; *P; ++P, ++cnt);
+                if (alloced) {                  /* just increase size */
+                        P = (char **)realloc((void *)environ,
+                            (size_t)(sizeof(char *) * (cnt + 2)));
+                        if (!P)
+                                return (-1);
+                        environ = P;
+                }
+                else {                          /* get new space */
+                        alloced = 1;            /* copy old entries into it */
+                        P = (char **)malloc((size_t)(sizeof(char *) *
+                            (cnt + 2)));
+                        if (!P)
+                                return (-1);
+                        bcopy(environ, P, cnt * sizeof(char *));
+                        environ = P;
+                }
+                environ[cnt + 1] = NULL;
+                offset = cnt;
+        }
+        for (C = (char *)name; *C && *C != '='; ++C);   /* no `=' in name */
+        if (!(environ[offset] =                 /* name + `=' + value */
+            malloc((size_t)((int)(C - name) + l_value + 2))))
+                return (-1);
+        for (C = environ[offset]; (*C = *name++) && *C != '='; ++C)
+                ;
+        for (*C++ = '='; (*C++ = *value++); )
+                ;
+        return (0);
+}
+
+/*
+ * unsetenv(name) --
+ *      Delete environmental variable "name".
+ */
+void
+unsetenv(name)
+        const char      *name;
+{
+        extern char **environ;
+        register char **P;
+        int offset;
+        char *__findenv();
+
+        while (__findenv(name, &offset))                /* if set multiple times */
+                for (P = &environ[offset];; ++P)
+                        if (!(*P = *(P + 1)))
+                                break;
+}