mark functions with const and pure attributes Mark functions per suggestions from gcc-4.6 when using these options: -Wsuggest-attribute=pure -Wsuggest-attribute=const. Use gnulib's _GL_ATTRIBUTE_PURE and _GL_ATTRIBUTE_CONST macros. Follow these guidelines: when possible, apply the attribute to an extern declaration, not to its definition. Apply it to the definition only when the definition is static. * lib/argmatch.h (argmatch, argmatch_to_argument): Mark. * lib/argv-iter.h (argv_iter_n_args): Likewise. * lib/base64.h (isbase64): Likewise. * lib/basename-lgpl.c (last_component, base_len): Likewise. * lib/c-ctype.h (c_isascii, c_isalnum, c_isalpha): Likewise. (c_isblank, c_iscntrl, c_isdigit, c_islower, c_isgraph): Likewise. (c_isprint, c_ispunct, c_isspace, c_isupper, c_isxdigit): Likewise. (c_tolower, c_toupper): Likewise. * lib/c-strcase.h (c_strcasecmp, c_strncasecmp): Likewise. * lib/chdir-long.c (find_non_slash): Likewise. * lib/dirname.h (base_len, dir_len, last_component): Likewise. * lib/exclude.h (fnmatch_pattern_has_wildcards): Likewise. * lib/file-type.h (file_type): Likewise. * lib/filenamecat-lgpl.c (longest_relative_suffix): Likewise. * lib/filevercmp.c (verrevcmp): Likewise. * lib/freadahead.h (freadahead): Likewise. * lib/fts.c (fts_maxarglen): Likewise. * lib/hash-pjw.h (hash_pjw): Likewise. * lib/hash-triple.h (triple_hash_no_name, triple_compare_ino_str): * lib/hash.c (is_prime, next_prime): Likewise. * lib/hash.c (hash_get_n_buckets, hash_get_n_buckets_used): Likewise. (hash_get_n_entries, hash_get_max_bucket_length): Likewise. (hash_table_ok, hash_get_first, hash_string): Likewise. (compute_bucket_size): Likewise. * lib/i-ring.h (i_ring_empty): Likewise. * lib/isnan.c (isnanl): Likewise. * lib/math.h (isnanl, rpl_isnanl): Likewise. * lib/memcasecmp.h (memcasecmp): Likewise. * lib/memchr2.h (memchr2): Likewise. * lib/memcmp2.h (memcmp2): Likewise. * lib/parse-datetime.y (lookup_zone): Likewise. * lib/sockets.h (gl_sockets_startup, gl_sockets_cleanup) [!WINDOWS_SOCKETS]: Likewise. * lib/strnlen1.h (strnlen1): Likewise. * lib/uniwidth.in.h (uc_width): Likewise, but since this is installed as a public header by libunistring, it cannot depend on the macro definitions of gnulib-common.m4, so open-code the __attribute__... * lib/quotearg.c: Add pragma to avoid unwarranted suggestion from gcc's -Wsuggest-attribute=pure for quoting_options_from_style. (quoting_options_from_style): Add a comment. * lib/propername.h (proper_name): Add a comment.

/* Scan memory for the first of two bytes.
   Copyright (C) 2008-2011 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Return the first address of either C1 or C2 (treated as unsigned
   char) that occurs within N bytes of the memory region S.  If
   neither byte appears, return NULL.  */

extern void *memchr2 (void const *s, int c1, int c2, size_t n)
  _GL_ATTRIBUTE_PURE;

#ifdef __cplusplus
}
#endif