diff options
Diffstat (limited to 'gl/m4/regex.m4')
| -rw-r--r-- | gl/m4/regex.m4 | 80 |
1 files changed, 52 insertions, 28 deletions
diff --git a/gl/m4/regex.m4 b/gl/m4/regex.m4 index 25da645e..7da6efed 100644 --- a/gl/m4/regex.m4 +++ b/gl/m4/regex.m4 @@ -1,4 +1,4 @@ -#serial 42 +#serial 48 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, # 2006, 2007 Free Software Foundation, Inc. @@ -18,9 +18,12 @@ AC_DEFUN([gl_REGEX], AC_ARG_WITH([included-regex], [AC_HELP_STRING([--without-included-regex], - [don't compile regex; this is the default on + [don't compile regex; this is the default on 32-bit systems with recent-enough versions of the GNU C - Library (use with caution on other systems)])]) + Library (use with caution on other systems). + On systems with 64-bit ptrdiff_t and 32-bit int, + --with-included-regex is the default, in case + regex functions operate on very long strings (>2GB)])]) case $with_included_regex in #( yes|no) ac_use_included_regex=$with_included_regex @@ -29,8 +32,7 @@ AC_DEFUN([gl_REGEX], # If the system regex support is good enough that it passes the # following run test, then default to *not* using the included regex.c. # If cross compiling, assume the test would fail and use the included - # regex.c. The first failing regular expression is from `Spencer ere - # test #75' in grep-2.3. + # regex.c. AC_CACHE_CHECK([for working re_compile_pattern], [gl_cv_func_re_compile_pattern_working], [AC_RUN_IFELSE( @@ -74,68 +76,91 @@ AC_DEFUN([gl_REGEX], } #endif + /* This test is from glibc bug 3957, reported by Andrew Mackey. */ + re_set_syntax (RE_SYNTAX_EGREP | RE_HAT_LISTS_NOT_NEWLINE); + memset (®ex, 0, sizeof regex); + s = re_compile_pattern ("a[^x]b", 6, ®ex); + if (s) + return 1; + + /* This should fail, but succeeds for glibc-2.5. */ + if (re_search (®ex, "a\nb", 3, 0, 3, ®s) != -1) + return 1; + + /* This regular expression is from Spencer ere test number 75 + in grep-2.3. */ re_set_syntax (RE_SYNTAX_POSIX_EGREP); - memset (®ex, 0, sizeof (regex)); + memset (®ex, 0, sizeof regex); for (i = 0; i <= UCHAR_MAX; i++) folded_chars[i] = i; regex.translate = folded_chars; s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, ®ex); /* This should fail with _Invalid character class name_ error. */ if (!s) - exit (1); + return 1; - /* This should succeed, but does not for e.g. glibc-2.1.3. */ - memset (®ex, 0, sizeof (regex)); + /* This should succeed, but does not for glibc-2.1.3. */ + memset (®ex, 0, sizeof regex); s = re_compile_pattern ("{1", 2, ®ex); if (s) - exit (1); + return 1; /* The following example is derived from a problem report against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */ - memset (®ex, 0, sizeof (regex)); + memset (®ex, 0, sizeof regex); s = re_compile_pattern ("[an\371]*n", 7, ®ex); if (s) - exit (1); + return 1; - /* This should match, but does not for e.g. glibc-2.2.1. */ + /* This should match, but does not for glibc-2.2.1. */ if (re_match (®ex, "an", 2, 0, ®s) != 2) - exit (1); + return 1; - memset (®ex, 0, sizeof (regex)); + memset (®ex, 0, sizeof regex); s = re_compile_pattern ("x", 1, ®ex); if (s) - exit (1); + return 1; - /* The version of regex.c in e.g. GNU libc-2.2.93 did not - work with a negative RANGE argument. */ + /* glibc-2.2.93 does not work with a negative RANGE argument. */ if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1) - exit (1); + return 1; /* The version of regex.c in older versions of gnulib ignored RE_ICASE. Detect that problem too. */ - memset (®ex, 0, sizeof (regex)); re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE); + memset (®ex, 0, sizeof regex); s = re_compile_pattern ("x", 1, ®ex); if (s) - exit (1); + return 1; if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0) - exit (1); + return 1; + + /* Catch a bug reported by Vin Shelton in + http://lists.gnu.org/archive/html/bug-coreutils/2007-06/msg00089.html + */ + re_set_syntax (RE_SYNTAX_POSIX_BASIC + & ~RE_CONTEXT_INVALID_DUP + & ~RE_NO_EMPTY_RANGES); + memset (®ex, 0, sizeof regex); + s = re_compile_pattern ("[[:alnum:]_-]\\\\+$", 16, ®ex); + if (s) + return 1; /* REG_STARTEND was added to glibc on 2004-01-15. Reject older versions. */ if (! REG_STARTEND) - exit (1); + return 1; /* Reject hosts whose regoff_t values are too narrow. These include glibc 2.3.5 on hosts with 64-bit ptrdiff_t and 32-bit int. */ if (sizeof (regoff_t) < sizeof (ptrdiff_t) || sizeof (regoff_t) < sizeof (ssize_t)) - exit (1); + return 1; - exit (0);]])], + return 0;]])], [gl_cv_func_re_compile_pattern_working=yes], [gl_cv_func_re_compile_pattern_working=no], dnl When crosscompiling, assume it is not working. @@ -190,9 +215,8 @@ AC_DEFUN([gl_REGEX], # Prerequisites of lib/regex.c and lib/regex_internal.c. AC_DEFUN([gl_PREREQ_REGEX], [ - AC_REQUIRE([AC_GNU_SOURCE]) + AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) AC_REQUIRE([AC_C_RESTRICT]) - AC_REQUIRE([AM_LANGINFO_CODESET]) - AC_CHECK_FUNCS_ONCE([iswctype mbrtowc mempcpy wcrtomb wcscoll]) + AC_CHECK_FUNCS_ONCE([isblank iswctype mbrtowc wcrtomb wcscoll]) AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>]) ]) |