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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
commitae581a19fbe896a797450b9d9573fb66f2735227 (patch)
tree56c40be8518a29c9351364d13a9676aa83932dc0 /lib/util/rcstr.c
parentInitial commit. (diff)
downloadsudo-ae581a19fbe896a797450b9d9573fb66f2735227.tar.xz
sudo-ae581a19fbe896a797450b9d9573fb66f2735227.zip
Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--lib/util/rcstr.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/lib/util/rcstr.c b/lib/util/rcstr.c
new file mode 100644
index 0000000..08b00bc
--- /dev/null
+++ b/lib/util/rcstr.c
@@ -0,0 +1,104 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2016-2018 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 <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_util.h"
+
+/* Trivial reference-counted strings. */
+struct rcstr {
+ int refcnt;
+ char str[1]; /* actually bigger */
+};
+
+/*
+ * Allocate a reference-counted string and copy src to it.
+ * Returns the newly-created string with a refcnt of 1.
+ */
+char *
+sudo_rcstr_dup(const char *src)
+{
+ size_t len = strlen(src);
+ char *dst;
+ debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
+
+ dst = sudo_rcstr_alloc(len);
+ if (dst != NULL) {
+ memcpy(dst, src, len);
+ dst[len] = '\0';
+ }
+ debug_return_ptr(dst);
+}
+
+char *
+sudo_rcstr_alloc(size_t len)
+{
+ struct rcstr *rcs;
+ debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
+
+ /* Note: sizeof(struct rcstr) includes space for the NUL */
+ rcs = malloc(sizeof(struct rcstr) + len);
+ if (rcs == NULL)
+ return NULL;
+
+ rcs->refcnt = 1;
+ rcs->str[0] = '\0';
+ /* cppcheck-suppress memleak */
+ debug_return_ptr(rcs->str); // -V773
+}
+
+char *
+sudo_rcstr_addref(const char *s)
+{
+ struct rcstr *rcs;
+ debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
+
+ if (s == NULL)
+ debug_return_ptr(NULL);
+
+ rcs = __containerof((const void *)s, struct rcstr, str);
+ rcs->refcnt++;
+ debug_return_ptr(rcs->str);
+}
+
+void
+sudo_rcstr_delref(const char *s)
+{
+ struct rcstr *rcs;
+ debug_decl(sudo_rcstr_dup, SUDO_DEBUG_UTIL);
+
+ if (s != NULL) {
+ rcs = __containerof((const void *)s, struct rcstr, str);
+ if (--rcs->refcnt == 0) {
+ rcs->str[0] = '\0';
+ free(rcs);
+ }
+ }
+ debug_return;
+}