posix: limits: de-duplicate limit logic

Rather than duplicating limit logic in several places, de-duplicate it
and centralize preprocessor checks in posix_limits.h .

Signed-off-by: Chris Friedt <[email protected]>

Author: cfriedt

include/zephyr/posix/posix_limits.h

@@ -7,6 +7,8 @@
 #ifndef ZEPHYR_INCLUDE_ZEPHYR_POSIX_POSIX_LIMITS_H_
 #define ZEPHYR_INCLUDE_ZEPHYR_POSIX_POSIX_LIMITS_H_
 
+#if defined(_POSIX_C_SOURCE) || defined(__DOXYGEN__)
+
 /*
  * clang-format and checkpatch disagree on formatting here, so rely on checkpatch and disable
  * clang-format since checkpatch cannot be selectively disabled.
@@ -122,4 +124,6 @@
 
 /* clang-format on */
 
+#endif
+
 #endif /* ZEPHYR_INCLUDE_ZEPHYR_POSIX_POSIX_LIMITS_H_ */

lib/libc/arcmwdt/include/limits.h

@@ -8,23 +8,10 @@
 #define LIB_LIBC_ARCMWDT_INCLUDE_LIMITS_H_
 
 #include_next <limits.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if defined(_POSIX_C_SOURCE) || defined(__DOXYGEN__)
-
 #include <zephyr/posix/posix_limits.h>
 
-#else
-
+#ifndef PATH_MAX
 #define PATH_MAX 256
-
-#endif
-
-#ifdef __cplusplus
-}
 #endif
 
-#endif  /* ZEPHYR_LIB_LIBC_ARMSTDC_INCLUDE_LIMITS_H_ */
+#endif  /* LIB_LIBC_ARCMWDT_INCLUDE_LIMITS_H_ */

lib/libc/armstdc/include/limits.h

@@ -8,23 +8,10 @@
 #define ZEPHYR_LIB_LIBC_ARMSTDC_INCLUDE_LIMITS_H_
 
 #include_next <limits.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if defined(_POSIX_C_SOURCE) || defined(__DOXYGEN__)
-
 #include <zephyr/posix/posix_limits.h>
 
-#else
-
+#ifndef PATH_MAX
 #define PATH_MAX 256
-
-#endif
-
-#ifdef __cplusplus
-}
 #endif
 
 #endif  /* ZEPHYR_LIB_LIBC_ARMSTDC_INCLUDE_LIMITS_H_ */

lib/libc/iar/include/limits.h

@@ -8,23 +8,10 @@
 #define ZEPHYR_LIB_LIBC_IAR_INCLUDE_LIMITS_H_
 
 #include_next <limits.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if defined(_POSIX_C_SOURCE) || defined(__DOXYGEN__)
-
 #include <zephyr/posix/posix_limits.h>
 
-#else
-
+#ifndef PATH_MAX
 #define PATH_MAX 256
-
-#endif
-
-#ifdef __cplusplus
-}
 #endif
 
 #endif /* ZEPHYR_LIB_LIBC_IAR_INCLUDE_LIMITS_H_ */