import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

security/nss/lib/base/libc.c

@@ -0,0 +1,143 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * libc.c
+ *
+ * This file contains our wrappers/reimplementations for "standard"
+ * libc functions.  Things like "memcpy."  We add to this as we need
+ * it.  Oh, and let's keep it in alphabetical order, should it ever
+ * get large.  Most string/character stuff should be in utf8.c, not
+ * here.  This file (and maybe utf8.c) should be the only ones in
+ * NSS to include files with angle brackets.
+ */
+
+#ifndef BASE_H
+#include "base.h"
+#endif /* BASE_H */
+
+#include <string.h> /* memcpy, memset */
+
+/*
+ * nsslibc_memcpy
+ * nsslibc_memset
+ * nsslibc_offsetof
+ * nsslibc_memequal
+ */
+
+/*
+ * nsslibc_memcpy
+ *
+ * Errors:
+ *  NSS_ERROR_INVALID_POINTER
+ *
+ * Return value:
+ *  NULL on error
+ *  The destination pointer on success
+ */
+
+NSS_IMPLEMENT void *
+nsslibc_memcpy(void *dest, const void *source, PRUint32 n)
+{
+#ifdef NSSDEBUG
+    if (((void *)NULL == dest) || ((const void *)NULL == source)) {
+        nss_SetError(NSS_ERROR_INVALID_POINTER);
+        return (void *)NULL;
+    }
+#endif /* NSSDEBUG */
+
+    return memcpy(dest, source, (size_t)n);
+}
+
+/*
+ * nsslibc_memset
+ *
+ * Errors:
+ *  NSS_ERROR_INVALID_POINTER
+ *
+ * Return value:
+ *  NULL on error
+ *  The destination pointer on success
+ */
+
+NSS_IMPLEMENT void *
+nsslibc_memset(void *dest, PRUint8 byte, PRUint32 n)
+{
+#ifdef NSSDEBUG
+    if (((void *)NULL == dest)) {
+        nss_SetError(NSS_ERROR_INVALID_POINTER);
+        return (void *)NULL;
+    }
+#endif /* NSSDEBUG */
+
+    return memset(dest, (int)byte, (size_t)n);
+}
+
+/*
+ * nsslibc_memequal
+ *
+ * Errors:
+ *  NSS_ERROR_INVALID_POINTER
+ *
+ * Return value:
+ *  PR_TRUE if they match
+ *  PR_FALSE if they don't
+ *  PR_FALSE upon error
+ */
+
+NSS_IMPLEMENT PRBool
+nsslibc_memequal(const void *a, const void *b, PRUint32 len,
+                 PRStatus *statusOpt)
+{
+#ifdef NSSDEBUG
+    if ((((void *)NULL == a) || ((void *)NULL == b))) {
+        nss_SetError(NSS_ERROR_INVALID_POINTER);
+        if ((PRStatus *)NULL != statusOpt) {
+            *statusOpt = PR_FAILURE;
+        }
+        return PR_FALSE;
+    }
+#endif /* NSSDEBUG */
+
+    if ((PRStatus *)NULL != statusOpt) {
+        *statusOpt = PR_SUCCESS;
+    }
+
+    if (0 == memcmp(a, b, len)) {
+        return PR_TRUE;
+    } else {
+        return PR_FALSE;
+    }
+}
+
+/*
+ * nsslibc_memcmp
+ */
+
+NSS_IMPLEMENT PRInt32
+nsslibc_memcmp(const void *a, const void *b, PRUint32 len, PRStatus *statusOpt)
+{
+    int v;
+
+#ifdef NSSDEBUG
+    if ((((void *)NULL == a) || ((void *)NULL == b))) {
+        nss_SetError(NSS_ERROR_INVALID_POINTER);
+        if ((PRStatus *)NULL != statusOpt) {
+            *statusOpt = PR_FAILURE;
+        }
+        return -2;
+    }
+#endif /* NSSDEBUG */
+
+    if ((PRStatus *)NULL != statusOpt) {
+        *statusOpt = PR_SUCCESS;
+    }
+
+    v = memcmp(a, b, len);
+    return (PRInt32)v;
+}
+
+/*
+ * offsetof is a preprocessor definition
+ */