87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
// Copyright 2007-2009 Russ Cox. All Rights Reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "re1.5.h"
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static int
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recursiveloop(char *pc, const char *sp, Subject *input, const char **subp, int nsubp)
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{
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const char *old;
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int off;
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re1_5_stack_chk();
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for(;;) {
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if(inst_is_consumer(*pc)) {
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// If we need to match a character, but there's none left, it's fail
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if(sp >= input->end)
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return 0;
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}
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switch(*pc++) {
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case Char:
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if(*sp != *pc++)
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return 0;
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case Any:
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sp++;
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continue;
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case Class:
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case ClassNot:
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if (!_re1_5_classmatch(pc, sp))
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return 0;
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pc += *(unsigned char*)pc * 2 + 1;
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sp++;
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continue;
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case NamedClass:
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if (!_re1_5_namedclassmatch(pc, sp))
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return 0;
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pc++;
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sp++;
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continue;
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case Match:
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return 1;
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case Jmp:
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off = (signed char)*pc++;
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pc = pc + off;
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continue;
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case Split:
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off = (signed char)*pc++;
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if(recursiveloop(pc, sp, input, subp, nsubp))
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return 1;
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pc = pc + off;
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continue;
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case RSplit:
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off = (signed char)*pc++;
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if(recursiveloop(pc + off, sp, input, subp, nsubp))
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return 1;
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continue;
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case Save:
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off = (unsigned char)*pc++;
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if(off >= nsubp) {
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continue;
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}
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old = subp[off];
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subp[off] = sp;
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if(recursiveloop(pc, sp, input, subp, nsubp))
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return 1;
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subp[off] = old;
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return 0;
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case Bol:
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if(sp != input->begin)
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return 0;
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continue;
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case Eol:
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if(sp != input->end)
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return 0;
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continue;
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}
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re1_5_fatal("recursiveloop");
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}
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}
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int
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re1_5_recursiveloopprog(ByteProg *prog, Subject *input, const char **subp, int nsubp, int is_anchored)
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{
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return recursiveloop(HANDLE_ANCHORED(prog->insts, is_anchored), input->begin, input, subp, nsubp);
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}
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