78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/* Scheme48 interface to Henry Spencer's regular expression package.
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** Copyright (c) 1993, 1994 by Olin Shivers.
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*/
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#include <stdlib.h>
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#include "regexp.h"
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#include "cstuff.h"
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/* Make sure our exports match up w/the implementation: */
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#include "re1.h"
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#ifndef NULL
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#define NULL 0
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#endif
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/* Not multi-threaded reentrant. */
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static char *regexp_error;
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/* Stash error msg in global. */
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void regerror(char *msg) {regexp_error = msg;}
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/* Return NULL normally, error string on error.
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** Stash match info in start_vec and end_vec.
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** Returns boolean match/no-match in hit.
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*/
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char *reg_match(const char *re, const char *string, int start,
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scheme_value start_vec, scheme_value end_vec, int *hit)
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{
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regexp *prog = regcomp(re);
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int status;
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*hit = 0;
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if( !prog ) return regexp_error;
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if( VECTOR_LENGTH(start_vec) != NSUBEXP ) {
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Free(prog);
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return "Illegal start vector";
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}
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if( VECTOR_LENGTH(end_vec) != NSUBEXP ) {
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Free(prog);
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return "Illegal end vector";
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}
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regexp_error = "";
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if( regexec(prog, string+start) ) {
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int i;
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for(i=0; i<NSUBEXP; i++) {
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VECTOR_REF(start_vec,i) = ENTER_FIXNUM(prog->startp[i] - string);
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VECTOR_REF(end_vec,i) = ENTER_FIXNUM(prog->endp[i] - string);
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}
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*hit = 1;
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}
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Free(prog);
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return regexp_error;
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}
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char *filter_stringvec(const char *re, char const **stringvec, int *nummatch)
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{
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regexp *prog = regcomp(re);
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char const **p = stringvec;
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char const **q = p;
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if( !prog ) return regexp_error;
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while(*p) {
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if( regexec(prog, *p) ) *q++ = *p;
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p++;
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}
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Free(prog);
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*nummatch = q-stringvec;
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return NULL;
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}
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