confstr() support for RTEMS

Closes #3373

confstr() style update

Signed-off-by: Eshan Dhawan <eshandhawan51@gmail.com>

2 files changed, 128 insertions, 0 deletions

diff --git a/cpukit/Makefile.am b/cpukit/Makefile.am
index dfa5fb2412..1afac8f7dc 100644
--- a/cpukit/Makefile.am
+++ b/cpukit/Makefile.am
@@ -509,6 +509,7 @@ librtemscpu_a_SOURCES += posix/src/condsignalsupp.c
 librtemscpu_a_SOURCES += posix/src/condtimedwait.c
 librtemscpu_a_SOURCES += posix/src/condwait.c
 librtemscpu_a_SOURCES += posix/src/condwaitsupp.c
+librtemscpu_a_SOURCES += posix/src/confstr.c
 librtemscpu_a_SOURCES += posix/src/_execve.c
 librtemscpu_a_SOURCES += posix/src/fork.c
 librtemscpu_a_SOURCES += posix/src/key.c
diff --git a/cpukit/posix/src/confstr.c b/cpukit/posix/src/confstr.c
new file mode 100644
index 0000000000..bf27ca3c38
--- /dev/null
+++ b/cpukit/posix/src/confstr.c
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ *  @file
+ *  @brief Implementation for confstr method
+ */
+
+/*
+ * Copyright (C) 2020 Eshan Dhawan
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <errno.h>
+#include <limits.h>
+#include <string.h>
+#include <unistd.h>
+
+/* Many programming environment flags have same values
+* this block is added to raise error if the flags value change
+*/
+
+#if (_CS_POSIX_V6_ILP32_OFF32_CFLAGS != _CS_POSIX_V7_ILP32_OFF32_CFLAGS)
+#error "_CS_POSIX_V6_ILP32_OFF32_CFLAGS and _CS_POSIX_V7_ILP32_OFF32_CFLAGS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V6_ILP32_OFF32_LDFLAGS != _CS_POSIX_V7_ILP32_OFF32_LDFLAGS)
+#error "_CS_POSIX_V6_ILP32_OFF32_LDFLAGS and _CS_POSIX_V7_ILP32_OFF32_LDFLAGS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V6_ILP32_OFF32_LIBS!= _CS_POSIX_V7_ILP32_OFF32_LIBS)
+#error "_CS_POSIX_V6_ILP32_OFF32_LIBS and _CS_POSIX_V7_ILP32_OFF32_LIBS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS != _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS)
+#error "_CS_POSIX_V6_LPBIG_OFFBIG_CFLAG and _CS_POSIX_V7_LPBIG_OFFBIG_CFLAG flag values not equal"
+#endif
+
+#if (_CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS != _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS)
+#error "_CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS and _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V7_LPBIG_OFFBIG_LIBS != _CS_POSIX_V7_LPBIG_OFFBIG_LIBS)
+#error "_CS_POSIX_V6_LPBIG_OFFBIG_LIBS and _CS_POSIX_V7_LPBIG_OFFBIG_LIBS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V6_ILP32_OFFBIG_CFLAGS != _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS)
+#error "_CS_POSIX_V6_ILP32_OFFBIG_CFLAGS and _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS != _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS)
+#error "_CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS and _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V7_ILP32_OFFBIG_LIBS != _CS_POSIX_V7_ILP32_OFFBIG_LIBS)
+#error "_CS_POSIX_V6_ILP32_OFFBIG_LIBS and _CS_POSIX_V7_ILP32_OFFBIG_LIBS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V6_LP64_OFF64_CFLAGS != _CS_POSIX_V7_LP64_OFF64_CFLAGS)
+#error "_CS_POSIX_V6_LP64_OFF64_CFLAGS and _CS_POSIX_V7_LP64_OFF64_CFLAGS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V6_LP64_OFF64_LDFLAGS != _CS_POSIX_V7_LP64_OFF64_LDFLAGS)
+#error "_CS_POSIX_V6_LP64_OFF64_LDFLAGS and _CS_POSIX_V7_LP64_OFF64_LDFLAGS flag values not equal"
+#endif
+
+#if (_CS_POSIX_V7_LP64_OFF64_LIBS != _CS_POSIX_V7_LP64_OFF64_LIBS)
+#error "_CS_POSIX_V6_LP64_OFF64_LIBS and _CS_POSIX_V7_LP64_OFF64_LIBS flag values not equal"
+#endif
+
+#if (_CS_V6_ENV != _CS_V7_ENV)
+#error "_CS_V6_ENV and _CS_V7_ENV flag values not equal"
+#endif
+
+size_t confstr(int name, char *buf, size_t len){
+  const char *p;
+  const char UPE[] = "unsupported programming environment";
+
+  switch (name) {
+    case _CS_PATH:
+      errno = EINVAL;
+      return (0);
+    case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
+    case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
+    case _CS_POSIX_V7_ILP32_OFF32_LIBS:
+    case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
+    case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
+    case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
+    case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
+    case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
+    case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
+    case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
+    case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
+    case _CS_POSIX_V7_LP64_OFF64_LIBS:
+    case _CS_V7_ENV:
+      p = UPE;
+      if (len != 0 && buf != NULL){
+        strlcpy(buf, p, len);
+      }
+      return (strlen(p) + 1);
+    default:
+      errno = EINVAL;
+      return (0);
+  }
+}