regexp.c revision 34f9b3eef6fdadbda0a846aa4d68691ac40eace5
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* <regexp.h> library support
*/
#define _REGEXP_DECLARE
#include <ast.h>
#include <regexp.h>
#include <regex.h>
#include <align.h>
typedef struct
{
regex_t re;
char* buf;
char* cur;
unsigned int size;
} Env_t;
static void*
block(void* handle, void* data, size_t size)
{
register Env_t* env = (Env_t*)handle;
if (data || (size = roundof(size, ALIGN_BOUND2)) > (env->buf + env->size - env->cur))
return 0;
data = (void*)env->cur;
env->cur += size;
return data;
}
int
_re_comp(regexp_t* re, const char* pattern, char* handle, unsigned int size)
{
register Env_t* env = (Env_t*)handle;
register int n;
if (size <= sizeof(Env_t))
return 50;
env->buf = env->cur = (char*)env + sizeof(Env_t);
env->size = size - sizeof(Env_t);
regalloc(env, block, REG_NOFREE);
n = regcomp(&env->re, pattern, REG_LENIENT|REG_NULL);
switch (n)
{
case 0:
break;
case REG_ERANGE:
n = 11;
break;
case REG_BADBR:
n = 16;
break;
case REG_ESUBREG:
n = 25;
break;
case REG_EPAREN:
n = 42;
break;
case REG_EBRACK:
n = 49;
break;
default:
n = 50;
break;
}
re->re_nbra = env->re.re_nsub;
return n;
}
int
_re_exec(regexp_t* re, const char* subject, const char* handle, int anchor)
{
register Env_t* env = (Env_t*)handle;
register int n;
regmatch_t match[elementsof(re->re_braslist)+1];
if (regexec(&env->re, subject, elementsof(match), match, 0) || anchor && match[0].rm_so)
return 0;
re->re_loc1 = (char*)subject + match[0].rm_so;
re->re_loc2 = (char*)subject + match[0].rm_eo;
for (n = 1; n <= env->re.re_nsub; n++)
{
re->re_braslist[n-1] = (char*)subject + match[n].rm_so;
re->re_braelist[n-1] = (char*)subject + match[n].rm_eo;
}
return 1;
}
char*
_re_putc(int c)
{
static Sfio_t* sp;
if (!sp && !(sp = sfstropen()))
return 0;
if (!c)
return sfstruse(sp);
sfputc(sp, c);
return 0;
}