--- /dev/null
+/*
+ * 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.
+ */
+
+#include "config.h"
+#ifndef HAVE_SETENV
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *rcsid = "$OpenBSD: setenv.c,v 1.3 1998/02/02 22:44:53 millert Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * __findenv --
+ * Returns pointer to value associated with name, if any, else NULL.
+ * Sets offset to be the offset of the name/value combination in the
+ * environmental array, for use by setenv(3) and unsetenv(3).
+ * Explicitly removes '=' in argument name.
+ *
+ * This routine *should* be a static; don't use it.
+ */
+char *
+__findenv(name, offset)
+ register const char *name;
+ int *offset;
+{
+ extern char **environ;
+ register int len, i;
+ register const char *np;
+ register char **p, *cp;
+
+ if (name == NULL || environ == NULL)
+ return (NULL);
+ for (np = name; *np && *np != '='; ++np)
+ ;
+ len = np - name;
+ for (p = environ; (cp = *p) != NULL; ++p) {
+ for (np = name, i = len; i && *cp; i--)
+ if (*cp++ != *np++)
+ break;
+ if (i == 0 && *cp++ == '=') {
+ *offset = p - environ;
+ return (cp);
+ }
+ }
+ return (NULL);
+}
+
+/*
+ * 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;
+}
+
+#endif /* HAVE_SETENV */
andersk / openssh.git / commitdiff
