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/* Copyright (c) 1990 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Regular expression parsing routines. |
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* |
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* External symbols declared in standard.h |
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*/ |
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#include "copyright.h" |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <ctype.h> |
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#include <string.h> |
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|
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/* |
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* rexpr.c - regular expression parser (ala grep) |
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*/ |
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#define same(a,b) (a==b || (iflag && (a^b)==' ' && isalpha(a))) |
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#ifdef BSD |
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#define memcpy(to,from,len) bcopy(from,to,len) |
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#endif |
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static int advance(), cclass(); |
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static char expbuf[ESIZE]; |
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static int iflag; |
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static int circf; |
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if ((c = *sp++) == '\0') |
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return(-1); |
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if (c == '<') { |
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*ep++ = CBRC; |
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if (ep == expbuf || ep[-1] != CBRC) |
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*ep++ = CBRC; |
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continue; |
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} |
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if (c == '>') { |
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char * |
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expsave() /* save compiled string */ |
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{ |
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extern char *malloc(); |
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register char *ep; |
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if (explen == 0) |
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return(NULL); |
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if ((ep = malloc(explen+3)) == NULL) |
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if ((ep = (char *)malloc(explen+3)) == NULL) |
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return(NULL); |
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ep[0] = iflag; |
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ep[1] = circf; |
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return(ep); |
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} |
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void |
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expset(ep) /* install saved string */ |
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register char *ep; |
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{ |
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} |
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char * |
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eindex(sp) /* find the expression in str */ |
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eindex(sp) /* find the expression in string sp */ |
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register char *sp; |
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{ |
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if (circf) { |
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if (advance(sp, expbuf)) |
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return(sp); |
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/* check for match at beginning of line, watch CBRC */ |
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if (advance(sp, expbuf[0]==CBRC ? expbuf+1 : expbuf)) |
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return(sp); |
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if (circf) |
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return(NULL); |
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} |
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/* fast check for first character */ |
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if (expbuf[0]==CCHR) { |
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register c = expbuf[1]; |
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do { |
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while (*++sp) |
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if (same(*sp, c) && advance(sp, expbuf)) |
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return(sp); |
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} while (*sp++); |
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return(NULL); |
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} |
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/* regular algorithm */ |
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do { |
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while (*++sp) |
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if (advance(sp, expbuf)) |
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return(sp); |
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} while (*sp++); |
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return(NULL); |
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} |
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return(0); |
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case CBRC: |
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if (lp == expbuf) |
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continue; |
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if ((isalnum(*lp) || *lp == '_') && !(isalnum(lp[-1]) || lp[-1] == '_')) |
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continue; |
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return (0); |
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cclass(set, c, af) |
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register char *set; |
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register c; |
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int af; |
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{ |
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register n; |
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