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23375: Phil Pennock: =~, zsh/regex etc. etc.

This commit is contained in:
Peter Stephenson 2007-05-01 22:05:03 +00:00
parent eb4c3d4bf2
commit 7f03c3d851
14 changed files with 392 additions and 51 deletions

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@ -1,3 +1,12 @@
2007-05-01 Peter Stephenson <p.w.stephenson@ntlworld.com>
* Phil Pennock + tweaks: 23375: configure.ac, Doc/Makefile.in,
Doc/Zsh/cond.yo, Doc/Zsh/mod_pcre.yo, Doc/Zsh/options.yo,
Src/cond.c, Src/options.c, Src/parse.c, Src/text.c, Src/zsh.h,
Src/Modules/pcre.c, Src/Modules/regex.c, Src/Modules/regex.mdd:
Add zsh/regex option, =~ syntax and related options
BASH_REMATCH, NO_CASE_MATCH, RE_MATCH_PCRE.
2007-05-01 Peter Stephenson <pws@csr.com>
* unposted: Doc/Zsh/contrib.yo: typo in widget name.

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@ -61,7 +61,7 @@ Zsh/mod_computil.yo \
Zsh/mod_datetime.yo Zsh/mod_deltochar.yo \
Zsh/mod_example.yo Zsh/mod_files.yo \
Zsh/mod_mapfile.yo Zsh/mod_mathfunc.yo Zsh/mod_newuser.yo \
Zsh/mod_parameter.yo Zsh/mod_pcre.yo \
Zsh/mod_parameter.yo Zsh/mod_pcre.yo Zsh/mod_regex.yo \
Zsh/mod_sched.yo Zsh/mod_socket.yo \
Zsh/mod_stat.yo Zsh/mod_system.yo Zsh/mod_tcp.yo \
Zsh/mod_termcap.yo Zsh/mod_terminfo.yo \

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@ -109,6 +109,20 @@ backward compatibility and should be considered obsolete.
item(var(string) tt(!=) var(pattern))(
true if var(string) does not match var(pattern).
)
item(var(string) tt(=~) var(regexp))(
true if var(string) matches the regular expression
var(regexp). If the option tt(RE_MATCH_PCRE) is set
var(regexp) is tested as a PCRE regular expression using
the tt(zsh/pcre) module, else it is tested as a POSIX
regular expression using the tt(zsh/regex) module.
If the option tt(BASH_REMATCH) is set the array
tt(BASH_REMATCH) is set to the substring that matched the pattern
followed by the substrings that matched parenthesised
subexpressions within the pattern; otherwise, the scalar parameter
tt(MATCH) is set to the substring that matched the pattern and
and the array tt(match) to the substrings that matched parenthesised
subexpressions.
)
item(var(string1) tt(<) var(string2))(
true if var(string1) comes before var(string2)
based on ASCII value of their characters.

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@ -22,14 +22,17 @@ Studies the previously-compiled PCRE which may result in faster
matching.
)
findex(pcre_match)
item(tt(pcre_match) [ tt(-a) var(arr) ] var(string))(
item(tt(pcre_match) [ tt(-v) var(var) ] [ tt(-a) var(arr) ] var(string))(
Returns successfully if tt(string) matches the previously-compiled
PCRE.
If the expression captures substrings within parentheses,
tt(pcre_match) will set the array var($match) to those
substrings, unless the tt(-a) option is given, in which
case it will set the array var(arr).
case it will set the array var(arr). Similarly, the variable
var(MATCH) will be set to the entire matched portion of the
string, unless the tt(-v) option is given, in which case the variable
var(var) will be set.
)
enditem()

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@ -319,6 +319,13 @@ will cause case-insensitive matching. For example, tt(cvs+LPAR()/+RPAR())
can match the directory tt(CVS) owing to the presence of the globbing flag
(unless the option tt(BARE_GLOB_QUAL) is unset).
)
pindex(CASE_MATCH)
cindex(case-insensitive regular expression matches, option)
cindex(regular expressions, case-insensitive matching, option)
item(tt(CASE_MATCH) <D>)(
Make regular expressions using the tt(zsh/regex) module (including
matches with tt(=~)) sensitive to case.
)
pindex(CSH_NULL_GLOB)
cindex(csh, null globbing style)
cindex(null globbing style, csh)
@ -478,6 +485,15 @@ var(xx) is set to tt(LPAR())var(a b c)tt(RPAR()), are substituted with
`var(fooabar foobbar foocbar)' instead of the default
`var(fooa b cbar)'.
)
pindex(REMATCH_PCRE)
cindex(regexp, PCRE)
cindex(PCRE, regexp)
item(tt(REMATCH_PCRE) <Z>)(
If set, regular expression matching with the tt(=~) operator will use
Perl-Compatible Regular Expressions from the PCRE library, if available.
If not set, regular expressions will use the extended regexp syntax
provided by the system libraries.
)
pindex(SH_GLOB)
cindex(sh, globbing style)
cindex(globbing style, sh)
@ -1131,6 +1147,20 @@ enditem()
subsect(Shell Emulation)
startitem()
pindex(BASH_REMATCH)
cindex(bash, BASH_REMATCH variable)
cindex(regexp, bash BASH_REMATCH variable)
item(tt(BASH_REMATCH))(
When set, matches performed with the tt(=~) operator will set the
tt(BASH_REMATCH) array variable, instead of the default tt(MATCH) and
tt(match) variables. The first element of the tt(BASH_REMATCH) array
will contain the entire matched text and subsequent elements will contain
extracted substrings. This option makes more sense when tt(KSH_ARRAYS) is
also set, so that the entire matched portion is stored at index 0 and the
first substring is at index 1. Without this option, the tt(MATCH) variable
contains the entire matched text and the tt(match) array variable contains
substrings.
)
pindex(BSD_ECHO)
cindex(echo, BSD compatible)
item(tt(BSD_ECHO) <S>)(

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@ -3,7 +3,7 @@
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 2001, 2002, 2003, 2004 Clint Adams
* Copyright (c) 2001, 2002, 2003, 2004, 2007 Clint Adams
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
@ -40,6 +40,37 @@
static pcre *pcre_pattern;
static pcre_extra *pcre_hints;
/**/
static int
zpcre_utf8_enabled(void)
{
#if defined(MULTIBYTE_SUPPORT) && defined(HAVE_NL_LANGINFO) && defined(CODESET)
static int have_utf8_pcre = -1;
/* value can toggle based on MULTIBYTE, so don't
* be too eager with caching */
if (have_utf8_pcre < -1)
return 0;
if (!isset(MULTIBYTE))
return 0;
if ((have_utf8_pcre == -1) &&
(!strcmp(nl_langinfo(CODESET), "UTF-8"))) {
if (pcre_config(PCRE_CONFIG_UTF8, &have_utf8_pcre))
have_utf8_pcre = -2; /* erk, failed to ask */
}
if (have_utf8_pcre < 0)
return 0;
return have_utf8_pcre;
#else
return 0;
#endif
}
/**/
static int
bin_pcre_compile(char *nam, char **args, Options ops, UNUSED(int func))
@ -52,8 +83,14 @@ bin_pcre_compile(char *nam, char **args, Options ops, UNUSED(int func))
if(OPT_ISSET(ops,'m')) pcre_opts |= PCRE_MULTILINE;
if(OPT_ISSET(ops,'x')) pcre_opts |= PCRE_EXTENDED;
if (zpcre_utf8_enabled())
pcre_opts |= PCRE_UTF8;
pcre_hints = NULL; /* Is this necessary? */
if (pcre_pattern)
pcre_free(pcre_pattern);
pcre_pattern = pcre_compile(*args, pcre_opts, &pcre_error, &pcre_errptr, NULL);
if (pcre_pattern == NULL)
@ -100,37 +137,52 @@ bin_pcre_study(char *nam, UNUSED(char **args), UNUSED(Options ops), UNUSED(int f
/**/
static int
zpcre_get_substrings(char *arg, int *ovec, int ret, char *receptacle)
zpcre_get_substrings(char *arg, int *ovec, int ret, char *matchvar, char *substravar, int matchedinarr)
{
char **captures, **matches;
char **captures, **match_all, **matches;
int capture_start = 1;
if(!pcre_get_substring_list(arg, ovec, ret, (const char ***)&captures)) {
matches = zarrdup(&captures[1]); /* first one would be entire string */
if (receptacle == NULL)
setaparam("match", matches);
else
setaparam(receptacle, matches);
pcre_free_substring_list((const char **)captures);
}
if (matchedinarr)
capture_start = 0;
if (matchvar == NULL)
matchvar = "MATCH";
if (substravar == NULL)
substravar = "match";
return 0;
/* captures[0] will be entire matched string, [1] first substring */
if(!pcre_get_substring_list(arg, ovec, ret, (const char ***)&captures)) {
match_all = ztrdup(captures[0]);
setsparam(matchvar, match_all);
matches = zarrdup(&captures[capture_start]);
setaparam(substravar, matches);
pcre_free_substring_list((const char **)captures);
}
return 0;
}
/**/
static int
bin_pcre_match(char *nam, char **args, Options ops, UNUSED(int func))
{
int ret, capcount, *ovec, ovecsize;
int ret, capcount, *ovec, ovecsize, c;
char *matched_portion = NULL;
char *receptacle = NULL;
int return_value = 1;
if (pcre_pattern == NULL) {
zwarnnam(nam, "no pattern has been compiled");
return 1;
}
if(OPT_ISSET(ops,'a')) {
receptacle = *args++;
if(!*args) {
zwarnnam(nam, "not enough arguments");
return 1;
}
if(OPT_HASARG(ops,c='a')) {
receptacle = OPT_ARG(ops,c);
}
if(OPT_HASARG(ops,c='v')) {
matched_portion = OPT_ARG(ops,c);
}
if(!*args) {
zwarnnam(nam, "not enough arguments");
}
if ((ret = pcre_fullinfo(pcre_pattern, pcre_hints, PCRE_INFO_CAPTURECOUNT, &capcount)))
@ -144,18 +196,20 @@ bin_pcre_match(char *nam, char **args, Options ops, UNUSED(int func))
ret = pcre_exec(pcre_pattern, pcre_hints, *args, strlen(*args), 0, 0, ovec, ovecsize);
if (ret==0) return 0;
else if (ret==PCRE_ERROR_NOMATCH) return 1; /* no match */
if (ret==0) return_value = 0;
else if (ret==PCRE_ERROR_NOMATCH) /* no match */;
else if (ret>0) {
zpcre_get_substrings(*args, ovec, ret, receptacle);
return 0;
zpcre_get_substrings(*args, ovec, ret, matched_portion, receptacle, 0);
return_value = 0;
}
else {
zwarnnam(nam, "error in pcre_exec");
return 1;
}
return 1;
if (ovec)
zfree(ovec, ovecsize*sizeof(int));
return return_value;
}
/**/
@ -164,33 +218,63 @@ cond_pcre_match(char **a, int id)
{
pcre *pcre_pat;
const char *pcre_err;
char *lhstr, *rhre;
char *lhstr, *rhre, *avar=NULL;
int r = 0, pcre_opts = 0, pcre_errptr, capcnt, *ov, ovsize;
int return_value = 0;
if (zpcre_utf8_enabled())
pcre_opts |= PCRE_UTF8;
lhstr = cond_str(a,0,0);
rhre = cond_str(a,1,0);
pcre_pat = ov = NULL;
if (isset(BASHREMATCH))
avar="BASH_REMATCH";
switch(id) {
case CPCRE_PLAIN:
pcre_pat = pcre_compile(rhre, pcre_opts, &pcre_err, &pcre_errptr, NULL);
pcre_fullinfo(pcre_pat, NULL, PCRE_INFO_CAPTURECOUNT, &capcnt);
ovsize = (capcnt+1)*3;
ov = zalloc(ovsize*sizeof(int));
r = pcre_exec(pcre_pat, NULL, lhstr, strlen(lhstr), 0, 0, ov, ovsize);
if (r==0) return 1;
pcre_pat = pcre_compile(rhre, pcre_opts, &pcre_err, &pcre_errptr, NULL);
if (pcre_pat == NULL) {
zwarn("failed to compile regexp /%s/: %s", rhre, pcre_err);
break;
}
pcre_fullinfo(pcre_pat, NULL, PCRE_INFO_CAPTURECOUNT, &capcnt);
ovsize = (capcnt+1)*3;
ov = zalloc(ovsize*sizeof(int));
r = pcre_exec(pcre_pat, NULL, lhstr, strlen(lhstr), 0, 0, ov, ovsize);
/* r < 0 => error; r==0 match but not enough size in ov
* r > 0 => (r-1) substrings found; r==1 => no substrings
*/
if (r==0) {
zwarn("reportable zsh problem: pcre_exec() returned 0");
return_value = 1;
break;
}
else if (r==PCRE_ERROR_NOMATCH) return 0; /* no match */
else if (r<0) {
zwarn("pcre_exec() error: %d", r);
break;
}
else if (r>0) {
zpcre_get_substrings(lhstr, ov, r, NULL);
return 1;
zpcre_get_substrings(lhstr, ov, r, NULL, avar, isset(BASHREMATCH));
return_value = 1;
break;
}
break;
}
return 0;
if (pcre_pat)
pcre_free(pcre_pat);
if (ov)
zfree(ov, ovsize*sizeof(int));
return return_value;
}
static struct conddef cotab[] = {
CONDDEF("pcre-match", CONDF_INFIX, cond_pcre_match, 0, 0, CPCRE_PLAIN)
/* CONDDEF can register =~ but it won't be found */
};
/**/
@ -206,7 +290,7 @@ static struct conddef cotab[] = {
static struct builtin bintab[] = {
BUILTIN("pcre_compile", 0, bin_pcre_compile, 1, 1, 0, "aimx", NULL),
BUILTIN("pcre_study", 0, bin_pcre_study, 0, 0, 0, NULL, NULL),
BUILTIN("pcre_match", 0, bin_pcre_match, 1, 2, 0, "a", NULL)
BUILTIN("pcre_match", 0, bin_pcre_match, 1, 1, 0, "a:v:", NULL)
};

161
Src/Modules/regex.c Normal file
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@ -0,0 +1,161 @@
/*
* regex.c
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 2007 Phil Pennock
* All Rights Reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Phil Pennock or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Phil Pennock and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Phil Pennock and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Phil Pennock and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "regex.mdh"
#include "regex.pro"
#include <regex.h>
/* we default to a vaguely modern syntax and set of capabilities */
#define ZREGEX_EXTENDED 0
/* if you want Basic syntax, make it an alternative options */
static void
zregex_regerrwarn(int r, regex_t *re, char *msg)
{
char *errbuf;
size_t errbufsz;
errbufsz = regerror(r, re, NULL, 0);
errbuf = zalloc(errbufsz*sizeof(char));
regerror(r, re, errbuf, errbufsz);
zwarn("%s: %s", msg, errbuf);
zfree(errbuf, errbufsz);
}
/**/
static int
zcond_regex_match(char **a, int id)
{
regex_t re;
regmatch_t *m, *matches = NULL;
size_t matchessz;
char *lhstr, *rhre, *s, **arr, **x;
int r, n, return_value, rcflags, reflags, nelem, start;
lhstr = cond_str(a,0,0);
rhre = cond_str(a,1,0);
rcflags = reflags = 0;
return_value = 0; /* 1 => matched successfully */
switch(id) {
case ZREGEX_EXTENDED:
rcflags |= REG_EXTENDED;
if (!isset(CASEMATCH))
rcflags |= REG_ICASE;
r = regcomp(&re, rhre, rcflags);
if (r) {
zregex_regerrwarn(r, &re, "failed to compile regex");
break;
}
/* re.re_nsub is number of parenthesized groups, we also need
* 1 for the 0 offset, which is the entire matched portion
*/
if (re.re_nsub < 0) {
zwarn("INTERNAL ERROR: regcomp() returned "
"negative subpattern count %d", re.re_nsub);
break;
}
matchessz = (re.re_nsub + 1) * sizeof(regmatch_t);
matches = zalloc(matchessz);
r = regexec(&re, lhstr, re.re_nsub+1, matches, reflags);
if (r == REG_NOMATCH) /**/;
else if (r == 0) {
return_value = 1;
if (isset(BASHREMATCH)) {
start = 0;
nelem = re.re_nsub + 1;
} else {
start = 1;
nelem = re.re_nsub;
}
arr = NULL; /* bogus gcc warning of used uninitialised */
/* entire matched portion + re_nsub substrings + NULL */
if (nelem) {
arr = x = (char **) zalloc(sizeof(char *) * (nelem + 1));
for (m = matches + start, n = start; n <= re.re_nsub; ++n, ++m, ++x) {
*x = ztrduppfx(lhstr + m->rm_so, m->rm_eo - m->rm_so);
}
*x = NULL;
}
if (isset(BASHREMATCH)) {
setaparam("BASH_REMATCH", arr);
} else {
m = matches;
s = ztrduppfx(lhstr + m->rm_so, m->rm_eo - m->rm_so);
setsparam("MATCH", s);
if (nelem)
setaparam("match", arr);
}
}
else zregex_regerrwarn(r, &re, "regex matching error");
break;
default:
DPUTS(1, "bad regex option");
break;
}
if (matches)
zfree(matches, matchessz);
regfree(&re);
return return_value;
}
static struct conddef cotab[] = {
CONDDEF("regex-match", CONDF_INFIX, zcond_regex_match, 0, 0, ZREGEX_EXTENDED)
};
/**/
int
setup_(UNUSED(Module m))
{
return 0;
}
/**/
int
boot_(Module m)
{
return !addconddefs(m->nam, cotab, sizeof(cotab)/sizeof(*cotab));
}
/**/
int
cleanup_(Module m)
{
deleteconddefs(m->nam, cotab, sizeof(cotab)/sizeof(*cotab));
return 0;
}
/**/
int
finish_(UNUSED(Module m))
{
return 0;
}

10
Src/Modules/regex.mdd Normal file
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@ -0,0 +1,10 @@
name=zsh/regex
link=`if test x$ac_cv_func_regcomp = xyes && \
test x$ac_cv_func_regexec = xyes && \
test x$ac_cv_func_regerror = xyes && \
test x$ac_cv_func_regfree = xyes; then echo dynamic; else echo no; fi`
load=no
autobins=""
objects="regex.o"

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@ -34,7 +34,7 @@ int tracingcond;
static char *condstr[COND_MOD] = {
"!", "&&", "||", "==", "!=", "<", ">", "-nt", "-ot", "-ef", "-eq",
"-ne", "-lt", "-gt", "-le", "-ge"
"-ne", "-lt", "-gt", "-le", "-ge", "=~"
};
/*
@ -53,14 +53,14 @@ int
evalcond(Estate state, char *fromtest)
{
struct stat *st;
char *left, *right;
char *left, *right, *overridename, overridebuf[13];
Wordcode pcode;
wordcode code;
int ctype, htok = 0, ret;
rec:
left = right = NULL;
left = right = overridename = NULL;
pcode = state->pc++;
code = *pcode;
ctype = WC_COND_TYPE(code);
@ -92,13 +92,28 @@ evalcond(Estate state, char *fromtest)
state->pc = pcode + (WC_COND_SKIP(code) + 1);
return ret;
}
case COND_REGEX:
{
char *modname = isset(REMATCHPCRE) ? "zsh/pcre" : "zsh/regex";
if (!load_module_silence(modname, 1)) {
zwarnnam(fromtest, "%s not available for regex",
modname);
return 2;
}
sprintf(overridename = overridebuf, "-%s-match", modname+4);
ctype = COND_MODI;
}
/*FALLTHROUGH*/
case COND_MOD:
case COND_MODI:
{
Conddef cd;
char *name = ecgetstr(state, EC_NODUP, NULL), **strs;
char *name = overridename;
char **strs;
int l = WC_COND_SKIP(code);
if (name == NULL)
name = ecgetstr(state, EC_NODUP, NULL);
if (ctype == COND_MOD)
strs = ecgetarr(state, l, EC_DUP, NULL);
else {
@ -139,7 +154,8 @@ evalcond(Estate state, char *fromtest)
return !cd->handler(strs, cd->condid);
} else {
zwarnnam(fromtest,
"unrecognized condition: `%s'", name);
"unrecognized condition: `%s'",
name ? name : "<null>");
}
}
/* module not found, error */

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@ -88,11 +88,13 @@ static struct optname optns[] = {
{{NULL, "banghist", OPT_NONBOURNE}, BANGHIST},
{{NULL, "bareglobqual", OPT_EMULATE|OPT_ZSH}, BAREGLOBQUAL},
{{NULL, "bashautolist", 0}, BASHAUTOLIST},
{{NULL, "bashrematch", 0}, BASHREMATCH},
{{NULL, "beep", OPT_ALL}, BEEP},
{{NULL, "bgnice", OPT_EMULATE|OPT_NONBOURNE},BGNICE},
{{NULL, "braceccl", OPT_EMULATE}, BRACECCL},
{{NULL, "bsdecho", OPT_EMULATE|OPT_SH}, BSDECHO},
{{NULL, "caseglob", OPT_ALL}, CASEGLOB},
{{NULL, "casematch", OPT_ALL}, CASEMATCH},
{{NULL, "cbases", 0}, CBASES},
{{NULL, "cdablevars", OPT_EMULATE}, CDABLEVARS},
{{NULL, "chasedots", OPT_EMULATE}, CHASEDOTS},
@ -201,6 +203,7 @@ static struct optname optns[] = {
{{NULL, "rcquotes", OPT_EMULATE}, RCQUOTES},
{{NULL, "rcs", OPT_ALL}, RCS},
{{NULL, "recexact", 0}, RECEXACT},
{{NULL, "rematchpcre", 0}, REMATCHPCRE},
{{NULL, "restricted", OPT_SPECIAL}, RESTRICTED},
{{NULL, "rmstarsilent", OPT_BOURNE}, RMSTARSILENT},
{{NULL, "rmstarwait", 0}, RMSTARWAIT},

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@ -2124,6 +2124,12 @@ par_cond_triple(char *a, char *b, char *c)
ecstr(a);
ecstr(c);
ecadd(ecnpats++);
} else if ((b[0] == Equals || b[0] == '=') &&
(b[1] == '~' || b[1] == Tilde) && ~b[2]) {
ecadd(WCB_COND(COND_REGEX, 0));
ecstr(a);
ecstr(c);
ecadd(ecnpats++);
} else if (b[0] == '-') {
if ((t0 = get_cond_num(b + 1)) > -1) {
ecadd(WCB_COND(t0 + COND_NT, 0));

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@ -640,7 +640,7 @@ gettext2(Estate state)
{
static char *c1[] = {
"=", "!=", "<", ">", "-nt", "-ot", "-ef", "-eq",
"-ne", "-lt", "-gt", "-le", "-ge"
"-ne", "-lt", "-gt", "-le", "-ge", "=~"
};
int ctype;
@ -724,7 +724,7 @@ gettext2(Estate state)
}
break;
default:
if (ctype <= COND_GE) {
if (ctype < COND_MOD) {
/* Binary test: `a = b' etc. */
taddstr(ecgetstr(state, EC_NODUP, NULL));
taddstr(" ");

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@ -519,8 +519,9 @@ struct timedfn {
#define COND_GT 13
#define COND_LE 14
#define COND_GE 15
#define COND_MOD 16
#define COND_MODI 17
#define COND_REGEX 16
#define COND_MOD 17
#define COND_MODI 18
typedef int (*CondHandler) _((char **, int));
@ -1588,11 +1589,13 @@ enum {
BANGHIST,
BAREGLOBQUAL,
BASHAUTOLIST,
BASHREMATCH,
BEEP,
BGNICE,
BRACECCL,
BSDECHO,
CASEGLOB,
CASEMATCH,
CBASES,
CDABLEVARS,
CHASEDOTS,
@ -1695,6 +1698,7 @@ enum {
RCQUOTES,
RCS,
RECEXACT,
REMATCHPCRE,
RESTRICTED,
RMSTARSILENT,
RMSTARWAIT,

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@ -1135,7 +1135,8 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \
erand48 open_memstream \
wctomb iconv \
grantpt unlockpt ptsname \
htons ntohs)
htons ntohs \
regcomp regexec regerror regfree)
AC_FUNC_STRCOLL
if test x$enable_cap = xyes; then