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-rw-r--r--openbsd-compat/setenv.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/openbsd-compat/setenv.c b/openbsd-compat/setenv.c
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+/* $OpenBSD: setenv.c,v 1.13 2010/08/23 22:31:50 millert Exp $ */
+/*
+ * 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. 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.
+ */
+
+/* OPENBSD ORIGINAL: lib/libc/stdlib/setenv.c */
+
+#include "includes.h"
+
+#if !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV)
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern char **environ;
+static char **lastenv; /* last value of environ */
+
+/* OpenSSH Portable: __findenv is from getenv.c rev 1.8, made static */
+/*
+ * __findenv --
+ * Returns pointer to value associated with name, if any, else NULL.
+ * Starts searching within the environmental array at offset.
+ * Sets offset to be the offset of the name/value combination in the
+ * environmental array, for use by putenv(3), setenv(3) and unsetenv(3).
+ * Explicitly removes '=' in argument name.
+ *
+ * This routine *should* be a static; don't use it.
+ */
+static char *
+__findenv(const char *name, int len, int *offset)
+{
+ extern char **environ;
+ int i;
+ const char *np;
+ char **p, *cp;
+
+ if (name == NULL || environ == NULL)
+ return (NULL);
+ for (p = environ + *offset; (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);
+}
+
+#if 0 /* nothing uses putenv */
+/*
+ * putenv --
+ * Add a name=value string directly to the environmental, replacing
+ * any current value.
+ */
+int
+putenv(char *str)
+{
+ char **P, *cp;
+ size_t cnt;
+ int offset = 0;
+
+ for (cp = str; *cp && *cp != '='; ++cp)
+ ;
+ if (*cp != '=') {
+ errno = EINVAL;
+ return (-1); /* missing `=' in string */
+ }
+
+ if (__findenv(str, (int)(cp - str), &offset) != NULL) {
+ environ[offset++] = str;
+ /* could be set multiple times */
+ while (__findenv(str, (int)(cp - str), &offset)) {
+ for (P = &environ[offset];; ++P)
+ if (!(*P = *(P + 1)))
+ break;
+ }
+ return (0);
+ }
+
+ /* create new slot for string */
+ for (P = environ; *P != NULL; P++)
+ ;
+ cnt = P - environ;
+ P = (char **)realloc(lastenv, sizeof(char *) * (cnt + 2));
+ if (!P)
+ return (-1);
+ if (lastenv != environ)
+ memcpy(P, environ, cnt * sizeof(char *));
+ lastenv = environ = P;
+ environ[cnt] = str;
+ environ[cnt + 1] = NULL;
+ return (0);
+}
+
+#endif
+
+#ifndef HAVE_SETENV
+/*
+ * setenv --
+ * Set the value of the environmental variable "name" to be
+ * "value". If rewrite is set, replace any current value.
+ */
+int
+setenv(const char *name, const char *value, int rewrite)
+{
+ char *C, **P;
+ const char *np;
+ int l_value, offset = 0;
+
+ for (np = name; *np && *np != '='; ++np)
+ ;
+#ifdef notyet
+ if (*np) {
+ errno = EINVAL;
+ return (-1); /* has `=' in name */
+ }
+#endif
+
+ l_value = strlen(value);
+ if ((C = __findenv(name, (int)(np - name), &offset)) != NULL) {
+ int tmpoff = offset + 1;
+ if (!rewrite)
+ return (0);
+#if 0 /* XXX - existing entry may not be writable */
+ if (strlen(C) >= l_value) { /* old larger; copy over */
+ while ((*C++ = *value++))
+ ;
+ return (0);
+ }
+#endif
+ /* could be set multiple times */
+ while (__findenv(name, (int)(np - name), &tmpoff)) {
+ for (P = &environ[tmpoff];; ++P)
+ if (!(*P = *(P + 1)))
+ break;
+ }
+ } else { /* create new slot */
+ size_t cnt;
+
+ for (P = environ; *P != NULL; P++)
+ ;
+ cnt = P - environ;
+ P = (char **)realloc(lastenv, sizeof(char *) * (cnt + 2));
+ if (!P)
+ return (-1);
+ if (lastenv != environ)
+ memcpy(P, environ, cnt * sizeof(char *));
+ lastenv = environ = P;
+ offset = cnt;
+ environ[cnt + 1] = NULL;
+ }
+ if (!(environ[offset] = /* name + `=' + value */
+ malloc((size_t)((int)(np - name) + l_value + 2))))
+ return (-1);
+ for (C = environ[offset]; (*C = *name++) && *C != '='; ++C)
+ ;
+ for (*C++ = '='; (*C++ = *value++); )
+ ;
+ return (0);
+}
+
+#endif /* HAVE_SETENV */
+
+#ifndef HAVE_UNSETENV
+/*
+ * unsetenv(name) --
+ * Delete environmental variable "name".
+ */
+int
+unsetenv(const char *name)
+{
+ char **P;
+ const char *np;
+ int offset = 0;
+
+ if (!name || !*name) {
+ errno = EINVAL;
+ return (-1);
+ }
+ for (np = name; *np && *np != '='; ++np)
+ ;
+ if (*np) {
+ errno = EINVAL;
+ return (-1); /* has `=' in name */
+ }
+
+ /* could be set multiple times */
+ while (__findenv(name, (int)(np - name), &offset)) {
+ for (P = &environ[offset];; ++P)
+ if (!(*P = *(P + 1)))
+ break;
+ }
+ return (0);
+}
+#endif /* HAVE_UNSETENV */
+
+#endif /* !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV) */
+