C++ (Cpp) _libelf_ar_get_stringの例

コード例 #1

ファイル: libelf_ar_util.c プロジェクト: AhmadTux/freebsd

/*
 * Retrieve the full name of the archive member.
 */
char *
_libelf_ar_get_name(char *buf, size_t bufsize, Elf *e)
{
	char c, *q, *r, *s;
	size_t len;
	size_t offset;

	assert(e->e_kind == ELF_K_AR);

	if (buf[0] == '/' && (c = buf[1]) >= '0' && c <= '9') {
		/*
		 * The value in field ar_name is a decimal offset into
		 * the archive string table where the actual name
		 * resides.
		 */
		if (_libelf_ar_get_number(buf + 1, bufsize - 1, 10,
		    &offset) == 0) {
			LIBELF_SET_ERROR(ARCHIVE, 0);
			return (NULL);
		}

		if (offset > e->e_u.e_ar.e_rawstrtabsz) {
			LIBELF_SET_ERROR(ARCHIVE, 0);
			return (NULL);
		}

		s = q = e->e_u.e_ar.e_rawstrtab + offset;
		r = e->e_u.e_ar.e_rawstrtab + e->e_u.e_ar.e_rawstrtabsz;

		for (s = q; s < r && *s != '/'; s++)
			;
		len = s - q + 1; /* space for the trailing NUL */

		if ((s = malloc(len)) == NULL) {
			LIBELF_SET_ERROR(RESOURCE, 0);
			return (NULL);
		}

		(void) strncpy(s, q, len);
		s[len - 1] = '\0';

		return (s);
	}

	/*
	 * Normal 'name'
	 */
	return (_libelf_ar_get_string(buf, bufsize, 0));
}

コード例 #2

ファイル: libelf_ar.c プロジェクト: ele7enxxh/dtrace-pf

Elf_Arhdr *
_libelf_ar_gethdr(Elf *e)
{
	Elf *parent;
	struct ar_hdr *arh;
	Elf_Arhdr *eh;
	size_t n;

	if ((parent = e->e_parent) == NULL) {
		LIBELF_SET_ERROR(ARGUMENT, 0);
		return (NULL);
	}

	arh = (struct ar_hdr *) ((uintptr_t) e->e_rawfile - sizeof(struct ar_hdr));

	assert((uintptr_t) arh >= (uintptr_t) parent->e_rawfile + SARMAG);
	assert((uintptr_t) arh <= (uintptr_t) parent->e_rawfile + parent->e_rawsize -
	    sizeof(struct ar_hdr));

	if ((eh = malloc(sizeof(Elf_Arhdr))) == NULL) {
		LIBELF_SET_ERROR(RESOURCE, 0);
		return (NULL);
	}

	e->e_arhdr = eh;
	eh->ar_name = eh->ar_rawname = NULL;

	if ((eh->ar_name = _libelf_ar_get_name(arh->ar_name, sizeof(arh->ar_name),
		 parent)) == NULL)
		goto error;

	if (_libelf_ar_get_number(arh->ar_uid, sizeof(arh->ar_uid), 10, &n) == 0)
		goto error;
	eh->ar_uid = (uid_t) n;

	if (_libelf_ar_get_number(arh->ar_gid, sizeof(arh->ar_gid), 10, &n) == 0)
		goto error;
	eh->ar_gid = (gid_t) n;

	if (_libelf_ar_get_number(arh->ar_mode, sizeof(arh->ar_mode), 8, &n) == 0)
		goto error;
	eh->ar_mode = (mode_t) n;

	if (_libelf_ar_get_number(arh->ar_size, sizeof(arh->ar_size), 10, &n) == 0)
		goto error;
	eh->ar_size = n;

	if ((eh->ar_rawname = _libelf_ar_get_string(arh->ar_name,
		 sizeof(arh->ar_name), 1)) == NULL)
		goto error;

	return (eh);

 error:
	if (eh) {
		if (eh->ar_name)
			free(eh->ar_name);
		if (eh->ar_rawname)
			free(eh->ar_rawname);
		free(eh);
	}
	e->e_arhdr = NULL;

	return (NULL);
}