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Copy pathrecursiveloop.c
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84 lines (80 loc) · 1.74 KB
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// Copyright 2007-2009 Russ Cox. All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "re1.5.h"
static int
recursiveloop(char *pc, const char *sp, Subject *input, const char **subp, int nsubp)
{
const char *old;
int off;
for(;;) {
if(inst_is_consumer(*pc)) {
// If we need to match a character, but there's none left, it's fail
if(sp >= input->end)
return 0;
}
switch(*pc++) {
case Char:
if(*sp != *pc++)
return 0;
case Any:
sp++;
continue;
case Class:
case ClassNot:
if (!_re1_5_classmatch(pc, sp))
return 0;
pc += *(unsigned char*)pc * 2 + 1;
sp++;
continue;
case NamedClass:
if (!_re1_5_namedclassmatch(pc, sp))
return 0;
pc++;
sp++;
continue;
case Match:
return 1;
case Jmp:
off = (signed char)*pc++;
pc = pc + off;
continue;
case Split:
off = (signed char)*pc++;
if(recursiveloop(pc, sp, input, subp, nsubp))
return 1;
pc = pc + off;
continue;
case RSplit:
off = (signed char)*pc++;
if(recursiveloop(pc + off, sp, input, subp, nsubp))
return 1;
continue;
case Save:
off = (unsigned char)*pc++;
if(off >= nsubp) {
continue;
}
old = subp[off];
subp[off] = sp;
if(recursiveloop(pc, sp, input, subp, nsubp))
return 1;
subp[off] = old;
return 0;
case Bol:
if(sp != input->begin)
return 0;
continue;
case Eol:
if(sp != input->end)
return 0;
continue;
}
re1_5_fatal("recursiveloop");
}
}
int
re1_5_recursiveloopprog(ByteProg *prog, Subject *input, const char **subp, int nsubp, int is_anchored)
{
return recursiveloop(HANDLE_ANCHORED(prog->insts, is_anchored), input->begin, input, subp, nsubp);
}