1/* Compatibility symbols for the obsolete <regexp.h> interface.
2 Copyright (C) 1996-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20/* regexp.h now contains only an #error directive, so it cannot be
21 used in this file.
22
23 The function that would produce an 'expbuf' to use as the second
24 argument to 'step' and 'advance' was defined only in regexp.h,
25 as its definition depended on macros defined by the user. */
26
27#include <regex.h>
28#include <shlib-compat.h>
29
30#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
31
32/* Define the variables used for the interface. Avoid .symver on common
33 symbol, which just creates a new common symbol, not an alias. */
34char *loc1 __attribute__ ((nocommon));
35char *loc2 __attribute__ ((nocommon));
36compat_symbol (libc, loc1, loc1, GLIBC_2_0);
37compat_symbol (libc, loc2, loc2, GLIBC_2_0);
38
39/* Although we do not support the use we define this variable as well. */
40char *locs __attribute__ ((nocommon));
41compat_symbol (libc, locs, locs, GLIBC_2_0);
42
43
44/* Find the next match in STRING. The compiled regular expression is
45 found in the buffer starting at EXPBUF. `loc1' will return the
46 first character matched and `loc2' points to the next unmatched
47 character. */
48int
49weak_function attribute_compat_text_section
50step (const char *string, const char *expbuf)
51{
52 regmatch_t match; /* We only need info about the full match. */
53
54 expbuf += __alignof (regex_t *);
55 expbuf -= (expbuf - ((const char *) 0)) % __alignof__ (regex_t *);
56
57 if (__regexec ((const regex_t *) expbuf, string, 1, &match, REG_NOTEOL)
58 == REG_NOMATCH)
59 return 0;
60
61 loc1 = (char *) string + match.rm_so;
62 loc2 = (char *) string + match.rm_eo;
63 return 1;
64}
65compat_symbol (libc, step, step, GLIBC_2_0);
66
67
68/* Match the beginning of STRING with the compiled regular expression
69 in EXPBUF. If the match is successful `loc2' will contain the
70 position of the first unmatched character. */
71int
72weak_function attribute_compat_text_section
73advance (const char *string, const char *expbuf)
74{
75 regmatch_t match; /* We only need info about the full match. */
76
77 expbuf += __alignof__ (regex_t *);
78 expbuf -= (expbuf - ((const char *) 0)) % __alignof__ (regex_t *);
79
80 if (__regexec ((const regex_t *) expbuf, string, 1, &match, REG_NOTEOL)
81 == REG_NOMATCH
82 /* We have to check whether the check is at the beginning of the
83 buffer. */
84 || match.rm_so != 0)
85 return 0;
86
87 loc2 = (char *) string + match.rm_eo;
88 return 1;
89}
90compat_symbol (libc, advance, advance, GLIBC_2_0);
91
92
93#endif /* SHLIB_COMPAT (2.0, 2.23) */
94