posix: Add pathconf and fpathconf

These POSIX apis provide for path-dependent limits.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

newlib/libc/include/sys/syslimits.h

@@ -59,8 +59,50 @@
 #define	LINE_MAX		 2048	/* max bytes in an input line */
 #define	RE_DUP_MAX		  255	/* max RE's in interval notation */
 
+
+#define _POSIX_AIO_LISTIO_MAX	2
+#define _POSIX_AIO_MAX	        1
+#define _POSIX_ARG_MAX	        4096
+#define _POSIX_CHILD_MAX	6
+#define _POSIX_DELAYTIMER_MAX	32
+#define _POSIX_LINK_MAX	        8
+#define _POSIX_LOGIN_NAME_MAX	9
+#define _POSIX_MAX_CANON	255
+#define _POSIX_MAX_INPUT	255
+#define _POSIX_MQ_OPEN_MAX	8
+#define _POSIX_MQ_PRIO_MAX	32
+#define _POSIX_NAME_MAX	        14
+#define _POSIX_NGROUPS_MAX	0
+#define _POSIX_OPEN_MAX	        16
+#define _POSIX_PATH_MAX	        255
+#define _POSIX_PIPE_BUF	        512
+#define _POSIX_RTSIG_MAX	8
+#define _POSIX_SEM_NSEMS_MAX	256
+#define _POSIX_SEM_VALUE_MAX	32767
+#define _POSIX_SIGQUEUE_MAX	32
+#define _POSIX_SSIZE_MAX	32767
+#define _POSIX_STREAM_MAX	8
+#define _POSIX_THREAD_DESTRUCTOR_ITERATIONS	4
+#define _POSIX_THREAD_KEYS_MAX	128
+#define _POSIX_THREAD_THREADS_MAX	64
+#define _POSIX_TIMER_MAX	32
+#define _POSIX_TTY_NAME_MAX	9
+#define _POSIX_TZNAME_MAX	3
+#define _POSIX2_BC_BASE_MAX	99
+#define _POSIX2_BC_DIM_MAX	2048
+#define _POSIX2_BC_SCALE_MAX	99
+#define _POSIX2_BC_STRING_MAX	1000
+#define _POSIX2_COLL_WEIGHTS_MAX	2
+#define _POSIX2_EXPR_NEST_MAX	32
+#define _POSIX2_LINE_MAX	2048
+#define _POSIX2_RE_DUP_MAX	255
+
 #endif /* __POSIX_VISIBLE */
 
+#ifdef _XOPEN_SOURCE
+#define _XOPEN_IOV_MAX          16
+#endif
+
 #if __MISC_VISIBLE
 #define NSIG_MAX       __LONG_WIDTH__   /* max signal number */
 #endif

newlib/libc/posix/CMakeLists.txt

@@ -36,6 +36,8 @@ picolibc_sources(
   basename.c
   dirname.c
   fnmatch.c
+  fpathconf.c
+  pathconf.c
   regcomp.c
   regerror.c
   regexec.c

newlib/libc/posix/fpathconf.c

@@ -0,0 +1,46 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright © 2024 Keith Packard
+ *
+ * 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.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ */
+
+#define _DEFAULT_SOURCE
+#include <unistd.h>
+#include <errno.h>
+#include <limits.h>
+
+long
+fpathconf (int fd, int name)
+{
+    (void) fd;
+    return pathconf(".", name);
+}

newlib/libc/posix/meson.build

@@ -36,6 +36,8 @@ srcs_posix = [
   'basename.c',
   'dirname.c',
   'fnmatch.c',
+  'fpathconf.c',
+  'pathconf.c',
   'regcomp.c',
   'regerror.c',
   'regexec.c',

newlib/libc/posix/pathconf.c

@@ -0,0 +1,85 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright © 2024 Keith Packard
+ *
+ * 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.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 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 HOLDER 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.
+ */
+
+#define _DEFAULT_SOURCE
+#include <unistd.h>
+#include <errno.h>
+#include <limits.h>
+
+long
+pathconf (const char *path, int name)
+{
+    (void) path;
+    switch (name) {
+    case _PC_LINK_MAX:
+        return _POSIX_LINK_MAX;
+
+    case _PC_MAX_CANON:
+        return _POSIX_MAX_CANON;
+
+    case _PC_MAX_INPUT:
+        return _POSIX_MAX_INPUT;
+
+    case _PC_NAME_MAX:
+        return _POSIX_NAME_MAX;
+
+    case _PC_PATH_MAX:
+        return _POSIX_PATH_MAX;
+
+    case _PC_PIPE_BUF:
+        return _POSIX_PIPE_BUF;
+
+    case _PC_CHOWN_RESTRICTED:
+#ifdef _POSIX_CHOWN_RESTRICTED
+        return _POSIX_CHOWN_RESTRICTED;
+#else
+        return 0;
+#endif
+
+    case _PC_NO_TRUNC:
+#ifdef _POSIX_NO_TRUNC
+        return _POSIX_NO_TRUNC;
+#else
+        return 0;
+#endif
+
+    case _PC_VDISABLE:
+        return 0;
+
+    default:
+        errno = EINVAL;
+        return -1;
+    }
+}