Use GetEnvironmentVariableA() instead of _dupenv_s()

Add util_env_var() and util_env_var_has_str() to utils_common.h.
Use GetEnvironmentVariableA() instead of _dupenv_s().

Signed-off-by: Lukasz Dorau <[email protected]>

Author: ldorau

src/utils/CMakeLists.txt

@@ -6,11 +6,13 @@ include(${UMF_CMAKE_SOURCE_DIR}/cmake/helpers.cmake)
 include(FindThreads)
 
 set(UMF_UTILS_SOURCES_POSIX
+    utils_posix_common.c
     utils_posix_concurrency.c
     utils_posix_math.c
 )
 
 set(UMF_UTILS_SOURCES_WINDOWS
+    utils_windows_common.c
     utils_windows_concurrency.c
     utils_windows_math.c
 )

src/utils/utils_common.h

@@ -13,7 +13,6 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 
 #ifndef _WIN32
 #include <sys/syscall.h>
@@ -36,45 +35,23 @@ extern "C" {
 
 #define __TLS __declspec(thread)
 
-static inline char *util_getenv(const char *name) {
-    char *buffer;
-    size_t numberOfElements;
-    errno_t err = _dupenv_s(&buffer, &numberOfElements, name);
-    if (err) {
-        return NULL;
-    }
-
-    return buffer;
-}
-
-static inline void util_free_getenv(char *val) { free(val); }
-
 // TODO: implement util_get_page_size() for Windows
 static inline size_t util_get_page_size(void) { return 4096; }
 
 #else /* Linux */
 
 #define __TLS __thread
 
-static inline char *util_getenv(const char *name) { return getenv(name); }
-static inline void util_free_getenv(const char *val) {
-    (void)val; // unused
-}
-
 static inline size_t util_get_page_size(void) { return sysconf(_SC_PAGE_SIZE); }
 
 #endif /* _WIN32 */
 
+int util_env_var(const char *envvar, char *buffer, size_t buffer_size);
+int util_env_var_has_str(const char *envvar, const char *str);
+
 // check if we are running in the proxy library
 static inline int is_running_in_proxy_lib(void) {
-    int is_in_proxy_lib_val = 0;
-    char *ld_preload = util_getenv("LD_PRELOAD");
-    if (ld_preload && strstr(ld_preload, "libumf_proxy.so")) {
-        is_in_proxy_lib_val = 1;
-    }
-
-    util_free_getenv(ld_preload);
-    return is_in_proxy_lib_val;
+    return util_env_var_has_str("LD_PRELOAD", "libumf_proxy.so");
 }
 
 #define NOFUNCTION                                                             \

src/utils/utils_posix_common.c

@@ -0,0 +1,47 @@
+/*
+ *
+ * Copyright (C) 2024 Intel Corporation
+ *
+ * Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+// Return value
+// If the function succeeds, the return value is the number of characters
+// stored in the buffer pointed to by buffer, not including
+// the terminating null character.
+//
+// If buffer is not large enough to hold the data, the return value
+// is the buffer size, in characters, required to hold the string
+// and its terminating null character and the contents of buffer are undefined.
+//
+// If the function fails, the return value is zero.
+int util_env_var(const char *envvar, char *buffer, size_t buffer_size) {
+    char *value = getenv(envvar);
+    if (!value) {
+        return 0;
+    }
+
+    size_t len = strlen(value) + 1;
+    if (len > buffer_size) {
+        return len;
+    }
+
+    strcpy(buffer, value);
+
+    return (len - 1);
+}
+
+// Check if the environment variable contains the given string.
+int util_env_var_has_str(const char *envvar, const char *str) {
+    char *value = getenv(envvar);
+    if (value && strstr(value, str)) {
+        return 1;
+    }
+
+    return 0;
+}

src/utils/utils_windows_common.c

@@ -0,0 +1,38 @@
+/*
+ *
+ * Copyright (C) 2024 Intel Corporation
+ *
+ * Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+ */
+
+#include <Windows.h>
+#include <processenv.h>
+
+#define BUFFER_SIZE 1024
+
+// Return value
+// If the function succeeds, the return value is the number of characters
+// stored in the buffer pointed to by buffer, not including
+// the terminating null character.
+//
+// If buffer is not large enough to hold the data, the return value
+// is the buffer size, in characters, required to hold the string
+// and its terminating null character and the contents of buffer are undefined.
+//
+// If the function fails, the return value is zero.
+int util_env_var(const char *envvar, char *buffer, size_t buffer_size) {
+    return GetEnvironmentVariableA(envvar, buffer, (DWORD)buffer_size);
+}
+
+// Check if the environment variable contains the given string.
+int util_env_var_has_str(const char *envvar, const char *str) {
+    char buffer[BUFFER_SIZE];
+    int rc = util_env_var(envvar, buffer, BUFFER_SIZE);
+    if (0 < rc && rc < BUFFER_SIZE) {
+        return strstr(buffer, str) ? 1 : 0;
+    }
+
+    return 0;
+}