295 lines
10 KiB
C
295 lines
10 KiB
C
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/*---------------------------------------------------------------------------
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match.c
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The match() routine recursively compares a string to a "pattern" (regular
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expression), returning TRUE if a match is found or FALSE if not. This
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version is specifically for use with unzip.c: as did the previous match()
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routines from SEA and J. Kercheval, it leaves the case (upper, lower, or
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mixed) of the string alone, but converts any uppercase characters in the
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pattern to lowercase if indicated by the global var pInfo->lcflag (which
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is to say, string is assumed to have been converted to lowercase already,
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if such was necessary).
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GRR: reversed order of text, pattern in matche() (now same as match());
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added ignore_case/ic flags, Case() macro.
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PaulK: replaced matche() with recmatch() from Zip, modified to have an
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ignore_case argument; replaced test frame with simpler one.
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---------------------------------------------------------------------------
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Copyright on recmatch() from Zip's util.c (although recmatch() was almost
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certainly written by Mark Adler...ask me how I can tell :-) ):
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Copyright (C) 1990-1992 Mark Adler, Richard B. Wales, Jean-loup Gailly,
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Kai Uwe Rommel and Igor Mandrichenko.
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Permission is granted to any individual or institution to use, copy,
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or redistribute this software so long as all of the original files are
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included unmodified, that it is not sold for profit, and that this copy-
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right notice is retained.
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---------------------------------------------------------------------------
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Match the pattern (wildcard) against the string (fixed):
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match(string, pattern, ignore_case);
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returns TRUE if string matches pattern, FALSE otherwise. In the pattern:
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`*' matches any sequence of characters (zero or more)
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`?' matches any single character
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[SET] matches any character in the specified set,
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[!SET] or [^SET] matches any character not in the specified set.
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A set is composed of characters or ranges; a range looks like ``character
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hyphen character'' (as in 0-9 or A-Z). [0-9a-zA-Z_] is the minimal set of
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characters allowed in the [..] pattern construct. Other characters are
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allowed (i.e., 8-bit characters) if your system will support them.
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To suppress the special syntactic significance of any of ``[]*?!^-\'', in-
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side or outside a [..] construct, and match the character exactly, precede
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it with a ``\'' (backslash).
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Note that "*.*" and "*." are treated specially under MS-DOS if DOSWILD is
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defined. See the DOSWILD section below for an explanation. Note also
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that with VMSWILD defined, '%' is used instead of '?', and sets (ranges)
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are delimited by () instead of [].
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---------------------------------------------------------------------------*/
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/* define ToLower() in here (for Unix, define ToLower to be macro (using
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* isupper()); otherwise just use tolower() */
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#define UNZIP_INTERNAL
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#include "unzip.h"
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#if 0 /* this is not useful until it matches Amiga names insensitively */
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#ifdef AMIGA /* some other platforms might also want to use this */
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# define ANSI_CHARSET /* MOVE INTO UNZIP.H EVENTUALLY */
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#endif
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#endif /* 0 */
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#ifdef ANSI_CHARSET
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# ifdef ToLower
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# undef ToLower
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# endif
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/* uppercase letters are values 41 thru 5A, C0 thru D6, and D8 thru DE */
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# define IsUpper(c) (c>=0xC0 ? c<=0xDE && c!=0xD7 : c>=0x41 && c<=0x5A)
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# define ToLower(c) (IsUpper((uch) c) ? (unsigned) c | 0x20 : (unsigned) c)
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#endif
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#define Case(x) (ic? ToLower(x) : (x))
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#ifdef VMSWILD
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# define WILDCHAR '%'
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# define BEG_RANGE '('
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# define END_RANGE ')'
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#else
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# define WILDCHAR '?'
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# define BEG_RANGE '['
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# define END_RANGE ']'
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#endif
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#if 0 /* GRR: add this to unzip.h someday... */
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#if !(defined(MSDOS) && defined(DOSWILD))
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#define match(s,p,ic) (recmatch((ZCONST uch *)p,(ZCONST uch *)s,ic) == 1)
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int recmatch OF((ZCONST uch *pattern, ZCONST uch *string, int ignore_case));
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#endif
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#endif /* 0 */
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static int recmatch OF((ZCONST uch *pattern, ZCONST uch *string,
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int ignore_case));
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/* match() is a shell to recmatch() to return only Boolean values. */
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int match(string, pattern, ignore_case)
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ZCONST char *string, *pattern;
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int ignore_case;
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{
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#if (defined(MSDOS) && defined(DOSWILD))
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char *dospattern;
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int j = strlen(pattern);
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/*---------------------------------------------------------------------------
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Optional MS-DOS preprocessing section: compare last three chars of the
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wildcard to "*.*" and translate to "*" if found; else compare the last
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two characters to "*." and, if found, scan the non-wild string for dots.
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If in the latter case a dot is found, return failure; else translate the
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"*." to "*". In either case, continue with the normal (Unix-like) match
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procedure after translation. (If not enough memory, default to normal
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match.) This causes "a*.*" and "a*." to behave as MS-DOS users expect.
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---------------------------------------------------------------------------*/
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if ((dospattern = (char *)malloc(j+1)) != NULL) {
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strcpy(dospattern, pattern);
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if (!strcmp(dospattern+j-3, "*.*")) {
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dospattern[j-2] = '\0'; /* nuke the ".*" */
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} else if (!strcmp(dospattern+j-2, "*.")) {
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char *p = strchr(string, '.');
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if (p) { /* found a dot: match fails */
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free(dospattern);
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return 0;
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}
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dospattern[j-1] = '\0'; /* nuke the end "." */
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}
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j = recmatch((uch *)dospattern, (uch *)string, ignore_case);
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free(dospattern);
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return j == 1;
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} else
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#endif /* MSDOS && DOSWILD */
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return recmatch((uch *)pattern, (uch *)string, ignore_case) == 1;
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}
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static int recmatch(p, s, ic)
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ZCONST uch *p; /* sh pattern to match */
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ZCONST uch *s; /* string to which to match it */
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int ic; /* true for case insensitivity */
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/* Recursively compare the sh pattern p with the string s and return 1 if
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* they match, and 0 or 2 if they don't or if there is a syntax error in the
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* pattern. This routine recurses on itself no more deeply than the number
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* of characters in the pattern. */
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{
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unsigned int c; /* pattern char or start of range in [-] loop */
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/* Get first character, the pattern for new recmatch calls follows */
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c = *p++;
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/* If that was the end of the pattern, match if string empty too */
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if (c == 0)
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return *s == 0;
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/* '?' (or '%') matches any character (but not an empty string) */
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if (c == WILDCHAR)
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return *s ? recmatch(p, s + 1, ic) : 0;
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/* '*' matches any number of characters, including zero */
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#ifdef AMIGA
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if (c == '#' && *p == '?') /* "#?" is Amiga-ese for "*" */
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c = '*', p++;
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#endif /* AMIGA */
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if (c == '*') {
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if (*p == 0)
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return 1;
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for (; *s; s++)
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if ((c = recmatch(p, s, ic)) != 0)
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return (int)c;
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return 2; /* 2 means give up--match will return false */
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}
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/* Parse and process the list of characters and ranges in brackets */
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if (c == BEG_RANGE) {
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int e; /* flag true if next char to be taken literally */
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ZCONST uch *q; /* pointer to end of [-] group */
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int r; /* flag true to match anything but the range */
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if (*s == 0) /* need a character to match */
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return 0;
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p += (r = (*p == '!' || *p == '^')); /* see if reverse */
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for (q = p, e = 0; *q; q++) /* find closing bracket */
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if (e)
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e = 0;
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else
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if (*q == '\\') /* GRR: change to ^ for MS-DOS, OS/2? */
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e = 1;
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else if (*q == END_RANGE)
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break;
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if (*q != END_RANGE) /* nothing matches if bad syntax */
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return 0;
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for (c = 0, e = *p == '-'; p < q; p++) { /* go through the list */
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if (e == 0 && *p == '\\') /* set escape flag if \ */
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e = 1;
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else if (e == 0 && *p == '-') /* set start of range if - */
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c = *(p-1);
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else {
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unsigned int cc = Case(*s);
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if (*(p+1) != '-')
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for (c = c ? c : *p; c <= *p; c++) /* compare range */
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if ((unsigned)Case(c) == cc) /* typecast for MSC bug */
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return r ? 0 : recmatch(q + 1, s + 1, ic);
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c = e = 0; /* clear range, escape flags */
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}
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}
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return r ? recmatch(q + 1, s + 1, ic) : 0; /* bracket match failed */
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}
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/* if escape ('\'), just compare next character */
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if (c == '\\' && (c = *p++) == 0) /* if \ at end, then syntax error */
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return 0;
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/* just a character--compare it */
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#ifdef QDOS
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return QMatch(Case((uch)c), Case(*s)) ? recmatch(p, ++s, ic) : 0;
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#else
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return Case((uch)c) == Case(*s) ? recmatch(p, ++s, ic) : 0;
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#endif
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} /* end function recmatch() */
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int iswild(p) /* originally only used for stat()-bug workaround in */
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ZCONST char *p; /* VAX C, Turbo/Borland C, Watcom C, Atari MiNT libs; */
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{ /* now used in process_zipfiles() as well */
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for (; *p; ++p)
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if (*p == '\\' && *(p+1))
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++p;
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#ifdef VMS
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else if (*p == '%' || *p == '*')
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#else /* !VMS */
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#ifdef AMIGA
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else if (*p == '?' || *p == '*' || (*p=='#' && p[1]=='?') || *p == '[')
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#else /* !AMIGA */
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else if (*p == '?' || *p == '*' || *p == '[')
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#endif /* ?AMIGA */
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#endif /* ?VMS */
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#ifdef QDOS
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return (int)p;
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#else
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return TRUE;
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#endif
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return FALSE;
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} /* end function iswild() */
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#ifdef TEST_MATCH
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#define put(s) {fputs(s,stdout); fflush(stdout);}
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void main()
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{
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char pat[256], str[256];
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for (;;) {
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put("Pattern (return to exit): ");
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gets(pat);
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if (!pat[0])
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break;
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for (;;) {
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put("String (return for new pattern): ");
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gets(str);
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if (!str[0])
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break;
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pipeit("Case sensitive: %s insensitive: %s\n",
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match(str, pat, 0) ? "YES" : "NO",
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match(str, pat, 1) ? "YES" : "NO");
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}
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}
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EXIT(0);
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}
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#endif /* TEST_MATCH */
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