569 lines
20 KiB
C
569 lines
20 KiB
C
/* A GNU-like <string.h>.
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Copyright (C) 1995-1996, 2001-2010 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#ifndef _GL_STRING_H
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/* The include_next requires a split double-inclusion guard. */
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#@INCLUDE_NEXT@ @NEXT_STRING_H@
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#ifndef _GL_STRING_H
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#define _GL_STRING_H
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#ifndef __attribute__
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/* This feature is available in gcc versions 2.5 and later. */
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
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# define __attribute__(Spec) /* empty */
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# endif
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/* The attribute __pure__ was added in gcc 2.96. */
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
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# define __pure__ /* empty */
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# endif
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#endif
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/* The definition of GL_LINK_WARNING is copied here. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Return the first occurrence of NEEDLE in HAYSTACK. */
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#if @GNULIB_MEMMEM@
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# if @REPLACE_MEMMEM@
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# define memmem rpl_memmem
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# endif
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# if ! @HAVE_DECL_MEMMEM@ || @REPLACE_MEMMEM@
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extern void *memmem (void const *__haystack, size_t __haystack_len,
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void const *__needle, size_t __needle_len)
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__attribute__ ((__pure__));
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef memmem
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# define memmem(a,al,b,bl) \
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(GL_LINK_WARNING ("memmem is unportable and often quadratic - " \
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"use gnulib module memmem-simple for portability, " \
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"and module memmem for speed" ), \
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memmem (a, al, b, bl))
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#endif
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/* Copy N bytes of SRC to DEST, return pointer to bytes after the
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last written byte. */
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#if @GNULIB_MEMPCPY@
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# if ! @HAVE_MEMPCPY@
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extern void *mempcpy (void *restrict __dest, void const *restrict __src,
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size_t __n);
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef mempcpy
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# define mempcpy(a,b,n) \
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(GL_LINK_WARNING ("mempcpy is unportable - " \
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"use gnulib module mempcpy for portability"), \
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mempcpy (a, b, n))
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#endif
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/* Search backwards through a block for a byte (specified as an int). */
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#if @GNULIB_MEMRCHR@
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# if ! @HAVE_DECL_MEMRCHR@
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extern void *memrchr (void const *, int, size_t)
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__attribute__ ((__pure__));
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef memrchr
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# define memrchr(a,b,c) \
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(GL_LINK_WARNING ("memrchr is unportable - " \
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"use gnulib module memrchr for portability"), \
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memrchr (a, b, c))
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#endif
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/* Copy SRC to DST, returning the address of the terminating '\0' in DST. */
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#if @GNULIB_STPCPY@
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# if ! @HAVE_STPCPY@
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extern char *stpcpy (char *restrict __dst, char const *restrict __src);
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef stpcpy
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# define stpcpy(a,b) \
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(GL_LINK_WARNING ("stpcpy is unportable - " \
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"use gnulib module stpcpy for portability"), \
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stpcpy (a, b))
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#endif
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/* Copy no more than N bytes of SRC to DST, returning a pointer past the
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last non-NUL byte written into DST. */
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#if @GNULIB_STPNCPY@
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# if ! @HAVE_STPNCPY@
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# define stpncpy gnu_stpncpy
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extern char *stpncpy (char *restrict __dst, char const *restrict __src,
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size_t __n);
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef stpncpy
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# define stpncpy(a,b,n) \
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(GL_LINK_WARNING ("stpncpy is unportable - " \
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"use gnulib module stpncpy for portability"), \
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stpncpy (a, b, n))
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#endif
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#if defined GNULIB_POSIXCHECK
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/* strchr() does not work with multibyte strings if the locale encoding is
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GB18030 and the character to be searched is a digit. */
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# undef strchr
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# define strchr(s,c) \
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(GL_LINK_WARNING ("strchr cannot work correctly on character strings " \
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"in some multibyte locales - " \
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"use mbschr if you care about internationalization"), \
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strchr (s, c))
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#endif
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/* Find the first occurrence of C in S or the final NUL byte. */
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#if @GNULIB_STRCHRNUL@
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# if ! @HAVE_STRCHRNUL@
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extern char *strchrnul (char const *__s, int __c_in)
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__attribute__ ((__pure__));
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef strchrnul
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# define strchrnul(a,b) \
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(GL_LINK_WARNING ("strchrnul is unportable - " \
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"use gnulib module strchrnul for portability"), \
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strchrnul (a, b))
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#endif
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/* Duplicate S, returning an identical malloc'd string. */
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#if @GNULIB_STRDUP@
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# if ! @HAVE_DECL_STRDUP@ && ! defined strdup
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extern char *strdup (char const *__s);
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef strdup
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# define strdup(a) \
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(GL_LINK_WARNING ("strdup is unportable - " \
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"use gnulib module strdup for portability"), \
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strdup (a))
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#endif
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/* Return a newly allocated copy of at most N bytes of STRING. */
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#if @GNULIB_STRNDUP@
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# if ! @HAVE_STRNDUP@
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# undef strndup
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# define strndup rpl_strndup
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# endif
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# if ! @HAVE_STRNDUP@ || ! @HAVE_DECL_STRNDUP@
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extern char *strndup (char const *__string, size_t __n);
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef strndup
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# define strndup(a,n) \
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(GL_LINK_WARNING ("strndup is unportable - " \
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"use gnulib module strndup for portability"), \
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strndup (a, n))
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#endif
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/* Find the length (number of bytes) of STRING, but scan at most
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MAXLEN bytes. If no '\0' terminator is found in that many bytes,
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return MAXLEN. */
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#if @GNULIB_STRNLEN@
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# if ! @HAVE_DECL_STRNLEN@
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extern size_t strnlen (char const *__string, size_t __maxlen)
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__attribute__ ((__pure__));
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef strnlen
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# define strnlen(a,n) \
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(GL_LINK_WARNING ("strnlen is unportable - " \
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"use gnulib module strnlen for portability"), \
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strnlen (a, n))
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#endif
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#if defined GNULIB_POSIXCHECK
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/* strcspn() assumes the second argument is a list of single-byte characters.
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Even in this simple case, it does not work with multibyte strings if the
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locale encoding is GB18030 and one of the characters to be searched is a
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digit. */
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# undef strcspn
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# define strcspn(s,a) \
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(GL_LINK_WARNING ("strcspn cannot work correctly on character strings " \
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"in multibyte locales - " \
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"use mbscspn if you care about internationalization"), \
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strcspn (s, a))
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#endif
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/* Find the first occurrence in S of any character in ACCEPT. */
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#if @GNULIB_STRPBRK@
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# if ! @HAVE_STRPBRK@
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extern char *strpbrk (char const *__s, char const *__accept)
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__attribute__ ((__pure__));
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# endif
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# if defined GNULIB_POSIXCHECK
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/* strpbrk() assumes the second argument is a list of single-byte characters.
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Even in this simple case, it does not work with multibyte strings if the
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locale encoding is GB18030 and one of the characters to be searched is a
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digit. */
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# undef strpbrk
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# define strpbrk(s,a) \
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(GL_LINK_WARNING ("strpbrk cannot work correctly on character strings " \
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"in multibyte locales - " \
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"use mbspbrk if you care about internationalization"), \
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strpbrk (s, a))
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef strpbrk
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# define strpbrk(s,a) \
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(GL_LINK_WARNING ("strpbrk is unportable - " \
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"use gnulib module strpbrk for portability"), \
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strpbrk (s, a))
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#endif
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#if defined GNULIB_POSIXCHECK
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/* strspn() assumes the second argument is a list of single-byte characters.
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Even in this simple case, it cannot work with multibyte strings. */
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# undef strspn
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# define strspn(s,a) \
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(GL_LINK_WARNING ("strspn cannot work correctly on character strings " \
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"in multibyte locales - " \
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"use mbsspn if you care about internationalization"), \
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strspn (s, a))
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#endif
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#if defined GNULIB_POSIXCHECK
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/* strrchr() does not work with multibyte strings if the locale encoding is
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GB18030 and the character to be searched is a digit. */
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# undef strrchr
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# define strrchr(s,c) \
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(GL_LINK_WARNING ("strrchr cannot work correctly on character strings " \
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"in some multibyte locales - " \
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"use mbsrchr if you care about internationalization"), \
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strrchr (s, c))
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#endif
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/* Search the next delimiter (char listed in DELIM) starting at *STRINGP.
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If one is found, overwrite it with a NUL, and advance *STRINGP
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to point to the next char after it. Otherwise, set *STRINGP to NULL.
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If *STRINGP was already NULL, nothing happens.
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Return the old value of *STRINGP.
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This is a variant of strtok() that is multithread-safe and supports
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empty fields.
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Caveat: It modifies the original string.
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Caveat: These functions cannot be used on constant strings.
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Caveat: The identity of the delimiting character is lost.
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Caveat: It doesn't work with multibyte strings unless all of the delimiter
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characters are ASCII characters < 0x30.
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See also strtok_r(). */
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#if @GNULIB_STRSEP@
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# if ! @HAVE_STRSEP@
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extern char *strsep (char **restrict __stringp, char const *restrict __delim);
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# endif
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# if defined GNULIB_POSIXCHECK
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# undef strsep
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# define strsep(s,d) \
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(GL_LINK_WARNING ("strsep cannot work correctly on character strings " \
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"in multibyte locales - " \
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"use mbssep if you care about internationalization"), \
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strsep (s, d))
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef strsep
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# define strsep(s,d) \
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(GL_LINK_WARNING ("strsep is unportable - " \
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"use gnulib module strsep for portability"), \
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strsep (s, d))
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#endif
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#if @GNULIB_STRSTR@
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# if @REPLACE_STRSTR@
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# define strstr rpl_strstr
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char *strstr (const char *haystack, const char *needle)
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__attribute__ ((__pure__));
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# endif
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#elif defined GNULIB_POSIXCHECK
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/* strstr() does not work with multibyte strings if the locale encoding is
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different from UTF-8:
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POSIX says that it operates on "strings", and "string" in POSIX is defined
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as a sequence of bytes, not of characters. */
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# undef strstr
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# define strstr(a,b) \
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(GL_LINK_WARNING ("strstr is quadratic on many systems, and cannot " \
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"work correctly on character strings in most " \
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"multibyte locales - " \
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"use mbsstr if you care about internationalization, " \
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"or use strstr if you care about speed"), \
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strstr (a, b))
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#endif
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/* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive
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comparison. */
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#if @GNULIB_STRCASESTR@
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# if @REPLACE_STRCASESTR@
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# define strcasestr rpl_strcasestr
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# endif
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# if ! @HAVE_STRCASESTR@ || @REPLACE_STRCASESTR@
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extern char *strcasestr (const char *haystack, const char *needle)
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__attribute__ ((__pure__));
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# endif
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#elif defined GNULIB_POSIXCHECK
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/* strcasestr() does not work with multibyte strings:
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It is a glibc extension, and glibc implements it only for unibyte
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locales. */
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# undef strcasestr
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# define strcasestr(a,b) \
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(GL_LINK_WARNING ("strcasestr does work correctly on character strings " \
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"in multibyte locales - " \
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"use mbscasestr if you care about " \
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"internationalization, or use c-strcasestr if you want " \
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"a locale independent function"), \
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strcasestr (a, b))
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#endif
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/* Parse S into tokens separated by characters in DELIM.
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If S is NULL, the saved pointer in SAVE_PTR is used as
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the next starting point. For example:
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char s[] = "-abc-=-def";
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char *sp;
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x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
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x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
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x = strtok_r(NULL, "=", &sp); // x = NULL
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// s = "abc\0-def\0"
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This is a variant of strtok() that is multithread-safe.
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For the POSIX documentation for this function, see:
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http://www.opengroup.org/susv3xsh/strtok.html
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Caveat: It modifies the original string.
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Caveat: These functions cannot be used on constant strings.
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Caveat: The identity of the delimiting character is lost.
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Caveat: It doesn't work with multibyte strings unless all of the delimiter
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characters are ASCII characters < 0x30.
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See also strsep(). */
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#if @GNULIB_STRTOK_R@
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# if ! @HAVE_DECL_STRTOK_R@
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extern char *strtok_r (char *restrict s, char const *restrict delim,
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char **restrict save_ptr);
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# endif
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# if defined GNULIB_POSIXCHECK
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# undef strtok_r
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# define strtok_r(s,d,p) \
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(GL_LINK_WARNING ("strtok_r cannot work correctly on character strings " \
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"in multibyte locales - " \
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"use mbstok_r if you care about internationalization"), \
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strtok_r (s, d, p))
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# endif
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#elif defined GNULIB_POSIXCHECK
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# undef strtok_r
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# define strtok_r(s,d,p) \
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(GL_LINK_WARNING ("strtok_r is unportable - " \
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"use gnulib module strtok_r for portability"), \
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strtok_r (s, d, p))
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#endif
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/* The following functions are not specified by POSIX. They are gnulib
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extensions. */
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#if @GNULIB_MBSLEN@
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/* Return the number of multibyte characters in the character string STRING.
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This considers multibyte characters, unlike strlen, which counts bytes. */
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extern size_t mbslen (const char *string);
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#endif
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#if @GNULIB_MBSNLEN@
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/* Return the number of multibyte characters in the character string starting
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at STRING and ending at STRING + LEN. */
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extern size_t mbsnlen (const char *string, size_t len);
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#endif
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#if @GNULIB_MBSCHR@
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/* Locate the first single-byte character C in the character string STRING,
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and return a pointer to it. Return NULL if C is not found in STRING.
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Unlike strchr(), this function works correctly in multibyte locales with
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encodings such as GB18030. */
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# define mbschr rpl_mbschr /* avoid collision with HP-UX function */
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extern char * mbschr (const char *string, int c);
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#endif
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#if @GNULIB_MBSRCHR@
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/* Locate the last single-byte character C in the character string STRING,
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and return a pointer to it. Return NULL if C is not found in STRING.
|
|
Unlike strrchr(), this function works correctly in multibyte locales with
|
|
encodings such as GB18030. */
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|
# define mbsrchr rpl_mbsrchr /* avoid collision with HP-UX function */
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extern char * mbsrchr (const char *string, int c);
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#endif
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#if @GNULIB_MBSSTR@
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/* Find the first occurrence of the character string NEEDLE in the character
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|
string HAYSTACK. Return NULL if NEEDLE is not found in HAYSTACK.
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|
Unlike strstr(), this function works correctly in multibyte locales with
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encodings different from UTF-8. */
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extern char * mbsstr (const char *haystack, const char *needle);
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#endif
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#if @GNULIB_MBSCASECMP@
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/* Compare the character strings S1 and S2, ignoring case, returning less than,
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equal to or greater than zero if S1 is lexicographically less than, equal to
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or greater than S2.
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Note: This function may, in multibyte locales, return 0 for strings of
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different lengths!
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Unlike strcasecmp(), this function works correctly in multibyte locales. */
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extern int mbscasecmp (const char *s1, const char *s2);
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#endif
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#if @GNULIB_MBSNCASECMP@
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/* Compare the initial segment of the character string S1 consisting of at most
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N characters with the initial segment of the character string S2 consisting
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of at most N characters, ignoring case, returning less than, equal to or
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greater than zero if the initial segment of S1 is lexicographically less
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than, equal to or greater than the initial segment of S2.
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Note: This function may, in multibyte locales, return 0 for initial segments
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of different lengths!
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Unlike strncasecmp(), this function works correctly in multibyte locales.
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But beware that N is not a byte count but a character count! */
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|
extern int mbsncasecmp (const char *s1, const char *s2, size_t n);
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#endif
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#if @GNULIB_MBSPCASECMP@
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/* Compare the initial segment of the character string STRING consisting of
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at most mbslen (PREFIX) characters with the character string PREFIX,
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ignoring case, returning less than, equal to or greater than zero if this
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initial segment is lexicographically less than, equal to or greater than
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PREFIX.
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|
Note: This function may, in multibyte locales, return 0 if STRING is of
|
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smaller length than PREFIX!
|
|
Unlike strncasecmp(), this function works correctly in multibyte
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|
locales. */
|
|
extern char * mbspcasecmp (const char *string, const char *prefix);
|
|
#endif
|
|
|
|
#if @GNULIB_MBSCASESTR@
|
|
/* Find the first occurrence of the character string NEEDLE in the character
|
|
string HAYSTACK, using case-insensitive comparison.
|
|
Note: This function may, in multibyte locales, return success even if
|
|
strlen (haystack) < strlen (needle) !
|
|
Unlike strcasestr(), this function works correctly in multibyte locales. */
|
|
extern char * mbscasestr (const char *haystack, const char *needle);
|
|
#endif
|
|
|
|
#if @GNULIB_MBSCSPN@
|
|
/* Find the first occurrence in the character string STRING of any character
|
|
in the character string ACCEPT. Return the number of bytes from the
|
|
beginning of the string to this occurrence, or to the end of the string
|
|
if none exists.
|
|
Unlike strcspn(), this function works correctly in multibyte locales. */
|
|
extern size_t mbscspn (const char *string, const char *accept);
|
|
#endif
|
|
|
|
#if @GNULIB_MBSPBRK@
|
|
/* Find the first occurrence in the character string STRING of any character
|
|
in the character string ACCEPT. Return the pointer to it, or NULL if none
|
|
exists.
|
|
Unlike strpbrk(), this function works correctly in multibyte locales. */
|
|
# define mbspbrk rpl_mbspbrk /* avoid collision with HP-UX function */
|
|
extern char * mbspbrk (const char *string, const char *accept);
|
|
#endif
|
|
|
|
#if @GNULIB_MBSSPN@
|
|
/* Find the first occurrence in the character string STRING of any character
|
|
not in the character string REJECT. Return the number of bytes from the
|
|
beginning of the string to this occurrence, or to the end of the string
|
|
if none exists.
|
|
Unlike strspn(), this function works correctly in multibyte locales. */
|
|
extern size_t mbsspn (const char *string, const char *reject);
|
|
#endif
|
|
|
|
#if @GNULIB_MBSSEP@
|
|
/* Search the next delimiter (multibyte character listed in the character
|
|
string DELIM) starting at the character string *STRINGP.
|
|
If one is found, overwrite it with a NUL, and advance *STRINGP to point
|
|
to the next multibyte character after it. Otherwise, set *STRINGP to NULL.
|
|
If *STRINGP was already NULL, nothing happens.
|
|
Return the old value of *STRINGP.
|
|
|
|
This is a variant of mbstok_r() that supports empty fields.
|
|
|
|
Caveat: It modifies the original string.
|
|
Caveat: These functions cannot be used on constant strings.
|
|
Caveat: The identity of the delimiting character is lost.
|
|
|
|
See also mbstok_r(). */
|
|
extern char * mbssep (char **stringp, const char *delim);
|
|
#endif
|
|
|
|
#if @GNULIB_MBSTOK_R@
|
|
/* Parse the character string STRING into tokens separated by characters in
|
|
the character string DELIM.
|
|
If STRING is NULL, the saved pointer in SAVE_PTR is used as
|
|
the next starting point. For example:
|
|
char s[] = "-abc-=-def";
|
|
char *sp;
|
|
x = mbstok_r(s, "-", &sp); // x = "abc", sp = "=-def"
|
|
x = mbstok_r(NULL, "-=", &sp); // x = "def", sp = NULL
|
|
x = mbstok_r(NULL, "=", &sp); // x = NULL
|
|
// s = "abc\0-def\0"
|
|
|
|
Caveat: It modifies the original string.
|
|
Caveat: These functions cannot be used on constant strings.
|
|
Caveat: The identity of the delimiting character is lost.
|
|
|
|
See also mbssep(). */
|
|
extern char * mbstok_r (char *string, const char *delim, char **save_ptr);
|
|
#endif
|
|
|
|
/* Map any int, typically from errno, into an error message. */
|
|
#if @GNULIB_STRERROR@
|
|
# if @REPLACE_STRERROR@
|
|
# undef strerror
|
|
# define strerror rpl_strerror
|
|
extern char *strerror (int);
|
|
# endif
|
|
#elif defined GNULIB_POSIXCHECK
|
|
# undef strerror
|
|
# define strerror(e) \
|
|
(GL_LINK_WARNING ("strerror is unportable - " \
|
|
"use gnulib module strerror to guarantee non-NULL result"), \
|
|
strerror (e))
|
|
#endif
|
|
|
|
#if @GNULIB_STRSIGNAL@
|
|
# if @REPLACE_STRSIGNAL@
|
|
# define strsignal rpl_strsignal
|
|
# endif
|
|
# if ! @HAVE_DECL_STRSIGNAL@ || @REPLACE_STRSIGNAL@
|
|
extern char *strsignal (int __sig);
|
|
# endif
|
|
#elif defined GNULIB_POSIXCHECK
|
|
# undef strsignal
|
|
# define strsignal(a) \
|
|
(GL_LINK_WARNING ("strsignal is unportable - " \
|
|
"use gnulib module strsignal for portability"), \
|
|
strsignal (a))
|
|
#endif
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _GL_STRING_H */
|
|
#endif /* _GL_STRING_H */
|