bpf: btf: implement btf_name_valid_identifier() (cdbb096a) · Commits · 戴 / test

Function btf_name_valid_identifier() have been implemented in bpf-next commit ("bpf: btf: Add BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO"). Backport this function so later patch can use it. Fixes: ("bpf: btf: Introduce BPF Type Format (BTF)") Signed-off-by:

Yonghong Song <yhs@fb.com> Signed-off-by:

Alexei Starovoitov <ast@kernel.org>

kernel/bpf/btf.c

+25 −0

Original line number	Diff line number	Diff line
		@@ -5,6 +5,7 @@
		#include <uapi/linux/types.h>
		#include <linux/seq_file.h>
		#include <linux/compiler.h>
		#include <linux/ctype.h>
		#include <linux/errno.h>
		#include <linux/slab.h>
		#include <linux/anon_inodes.h>
		@@ -426,6 +427,30 @@ static bool btf_name_offset_valid(const struct btf *btf, u32 offset)
		offset < btf->hdr.str_len;
		}

		/* Only C-style identifier is permitted. This can be relaxed if
		* necessary.
		*/
		static bool btf_name_valid_identifier(const struct btf *btf, u32 offset)
		{
		/* offset must be valid */
		const char *src = &btf->strings[offset];
		const char *src_limit;

		if (!isalpha(src) && src != '_')
		return false;

		/* set a limit on identifier length */
		src_limit = src + KSYM_NAME_LEN;
		src++;
		while (*src && src < src_limit) {
		if (!isalnum(src) && src != '_')
		return false;
		src++;
		}

		return !*src;
		}

		static const char btf_name_by_offset(const struct btf btf, u32 offset)
		{
		if (!offset)

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