1 files changed, 74 insertions, 0 deletions
diff --git a/plugins/sudoers/strvec_join.c b/plugins/sudoers/strvec_join.c
new file mode 100644
index 0000000..ae209eb
--- /dev/null
+++ b/plugins/sudoers/strvec_join.c
@@ -0,0 +1,74 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2021 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sudoers.h"
+
+#ifdef HAVE_STRLCPY
+# define cpy_default	strlcpy
+#else
+# define cpy_default	sudo_strlcpy
+#endif
+
+/*
+ * Join a NULL-terminated array of strings using the specified separator
+ * char.  If non-NULL, the copy function must have strlcpy-like semantics.
+ */
+char *
+strvec_join(char *const argv[], char sep, size_t (*cpy)(char *, const char *, size_t))
+{
+    char *dst, *result = NULL;
+    char *const *av;
+    size_t n, size = 0;
+    debug_decl(strvec_join, SUDOERS_DEBUG_UTIL);
+
+    for (av = argv; *av != NULL; av++)
+	size += strlen(*av) + 1;
+    if (size == 0 || (result = malloc(size)) == NULL) {
+	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	debug_return_ptr(NULL);
+    }
+
+    if (cpy == NULL)
+	cpy = cpy_default;
+    for (dst = result, av = argv; *av != NULL; av++) {
+	n = cpy(dst, *av, size);
+	if (n >= size) {
+	    sudo_warnx(U_("internal error, %s overflow"), __func__);
+	    free(result);
+	    debug_return_ptr(NULL);
+	}
+	dst += n;
+	size -= n;
+	*dst++ = sep;
+	size--;
+    }
+    dst[-1] = '\0';
+
+    debug_return_str(result);
+}