464 lines
8.6 KiB
C
464 lines
8.6 KiB
C
/*
|
|
* Copyright (C) 1984-2019 Mark Nudelman
|
|
*
|
|
* You may distribute under the terms of either the GNU General Public
|
|
* License or the Less License, as specified in the README file.
|
|
*
|
|
* For more information, see the README file.
|
|
*/
|
|
|
|
/*
|
|
* Routines to do pattern matching.
|
|
*/
|
|
|
|
#include "less.h"
|
|
|
|
extern int caseless;
|
|
extern int utf_mode;
|
|
|
|
/*
|
|
* Compile a search pattern, for future use by match_pattern.
|
|
*/
|
|
static int
|
|
compile_pattern2(pattern, search_type, comp_pattern, show_error)
|
|
char *pattern;
|
|
int search_type;
|
|
PATTERN_TYPE *comp_pattern;
|
|
int show_error;
|
|
{
|
|
if (search_type & SRCH_NO_REGEX)
|
|
return (0);
|
|
{
|
|
#if HAVE_GNU_REGEX
|
|
struct re_pattern_buffer *comp = (struct re_pattern_buffer *)
|
|
ecalloc(1, sizeof(struct re_pattern_buffer));
|
|
re_set_syntax(RE_SYNTAX_POSIX_EXTENDED);
|
|
if (re_compile_pattern(pattern, strlen(pattern), comp))
|
|
{
|
|
free(comp);
|
|
if (show_error)
|
|
error("Invalid pattern", NULL_PARG);
|
|
return (-1);
|
|
}
|
|
if (*comp_pattern != NULL)
|
|
{
|
|
regfree(*comp_pattern);
|
|
free(*comp_pattern);
|
|
}
|
|
*comp_pattern = comp;
|
|
#endif
|
|
#if HAVE_POSIX_REGCOMP
|
|
regex_t *comp = (regex_t *) ecalloc(1, sizeof(regex_t));
|
|
if (regcomp(comp, pattern, REGCOMP_FLAG))
|
|
{
|
|
free(comp);
|
|
if (show_error)
|
|
error("Invalid pattern", NULL_PARG);
|
|
return (-1);
|
|
}
|
|
if (*comp_pattern != NULL)
|
|
{
|
|
regfree(*comp_pattern);
|
|
free(*comp_pattern);
|
|
}
|
|
*comp_pattern = comp;
|
|
#endif
|
|
#if HAVE_PCRE
|
|
constant char *errstring;
|
|
int erroffset;
|
|
PARG parg;
|
|
pcre *comp = pcre_compile(pattern,
|
|
(utf_mode) ? PCRE_UTF8 | PCRE_NO_UTF8_CHECK : 0,
|
|
&errstring, &erroffset, NULL);
|
|
if (comp == NULL)
|
|
{
|
|
parg.p_string = (char *) errstring;
|
|
if (show_error)
|
|
error("%s", &parg);
|
|
return (-1);
|
|
}
|
|
*comp_pattern = comp;
|
|
#endif
|
|
#if HAVE_PCRE2
|
|
int errcode;
|
|
PCRE2_SIZE erroffset;
|
|
PARG parg;
|
|
pcre2_code *comp = pcre2_compile((PCRE2_SPTR)pattern, strlen(pattern),
|
|
0, &errcode, &erroffset, NULL);
|
|
if (comp == NULL)
|
|
{
|
|
if (show_error)
|
|
{
|
|
char msg[160];
|
|
pcre2_get_error_message(errcode, (PCRE2_UCHAR*)msg, sizeof(msg));
|
|
parg.p_string = msg;
|
|
error("%s", &parg);
|
|
}
|
|
return (-1);
|
|
}
|
|
*comp_pattern = comp;
|
|
#endif
|
|
#if HAVE_RE_COMP
|
|
PARG parg;
|
|
if ((parg.p_string = re_comp(pattern)) != NULL)
|
|
{
|
|
if (show_error)
|
|
error("%s", &parg);
|
|
return (-1);
|
|
}
|
|
*comp_pattern = 1;
|
|
#endif
|
|
#if HAVE_REGCMP
|
|
char *comp;
|
|
if ((comp = regcmp(pattern, 0)) == NULL)
|
|
{
|
|
if (show_error)
|
|
error("Invalid pattern", NULL_PARG);
|
|
return (-1);
|
|
}
|
|
if (comp_pattern != NULL)
|
|
free(*comp_pattern);
|
|
*comp_pattern = comp;
|
|
#endif
|
|
#if HAVE_V8_REGCOMP
|
|
struct regexp *comp;
|
|
reg_show_error = show_error;
|
|
comp = regcomp(pattern);
|
|
reg_show_error = 1;
|
|
if (comp == NULL)
|
|
{
|
|
/*
|
|
* regcomp has already printed an error message
|
|
* via regerror().
|
|
*/
|
|
return (-1);
|
|
}
|
|
if (*comp_pattern != NULL)
|
|
free(*comp_pattern);
|
|
*comp_pattern = comp;
|
|
#endif
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Like compile_pattern2, but convert the pattern to lowercase if necessary.
|
|
*/
|
|
public int
|
|
compile_pattern(pattern, search_type, comp_pattern)
|
|
char *pattern;
|
|
int search_type;
|
|
PATTERN_TYPE *comp_pattern;
|
|
{
|
|
char *cvt_pattern;
|
|
int result;
|
|
|
|
if (caseless != OPT_ONPLUS)
|
|
cvt_pattern = pattern;
|
|
else
|
|
{
|
|
cvt_pattern = (char*) ecalloc(1, cvt_length(strlen(pattern), CVT_TO_LC));
|
|
cvt_text(cvt_pattern, pattern, (int *)NULL, (int *)NULL, CVT_TO_LC);
|
|
}
|
|
result = compile_pattern2(cvt_pattern, search_type, comp_pattern, 1);
|
|
if (cvt_pattern != pattern)
|
|
free(cvt_pattern);
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* Forget that we have a compiled pattern.
|
|
*/
|
|
public void
|
|
uncompile_pattern(pattern)
|
|
PATTERN_TYPE *pattern;
|
|
{
|
|
#if HAVE_GNU_REGEX
|
|
if (*pattern != NULL)
|
|
{
|
|
regfree(*pattern);
|
|
free(*pattern);
|
|
}
|
|
*pattern = NULL;
|
|
#endif
|
|
#if HAVE_POSIX_REGCOMP
|
|
if (*pattern != NULL)
|
|
{
|
|
regfree(*pattern);
|
|
free(*pattern);
|
|
}
|
|
*pattern = NULL;
|
|
#endif
|
|
#if HAVE_PCRE
|
|
if (*pattern != NULL)
|
|
pcre_free(*pattern);
|
|
*pattern = NULL;
|
|
#endif
|
|
#if HAVE_PCRE2
|
|
if (*pattern != NULL)
|
|
pcre2_code_free(*pattern);
|
|
*pattern = NULL;
|
|
#endif
|
|
#if HAVE_RE_COMP
|
|
*pattern = 0;
|
|
#endif
|
|
#if HAVE_REGCMP
|
|
if (*pattern != NULL)
|
|
free(*pattern);
|
|
*pattern = NULL;
|
|
#endif
|
|
#if HAVE_V8_REGCOMP
|
|
if (*pattern != NULL)
|
|
free(*pattern);
|
|
*pattern = NULL;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Can a pattern be successfully compiled?
|
|
*/
|
|
public int
|
|
valid_pattern(pattern)
|
|
char *pattern;
|
|
{
|
|
PATTERN_TYPE comp_pattern;
|
|
int result;
|
|
|
|
CLEAR_PATTERN(comp_pattern);
|
|
result = compile_pattern2(pattern, 0, &comp_pattern, 0);
|
|
if (result != 0)
|
|
return (0);
|
|
uncompile_pattern(&comp_pattern);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Is a compiled pattern null?
|
|
*/
|
|
public int
|
|
is_null_pattern(pattern)
|
|
PATTERN_TYPE pattern;
|
|
{
|
|
#if HAVE_GNU_REGEX
|
|
return (pattern == NULL);
|
|
#endif
|
|
#if HAVE_POSIX_REGCOMP
|
|
return (pattern == NULL);
|
|
#endif
|
|
#if HAVE_PCRE
|
|
return (pattern == NULL);
|
|
#endif
|
|
#if HAVE_PCRE2
|
|
return (pattern == NULL);
|
|
#endif
|
|
#if HAVE_RE_COMP
|
|
return (pattern == 0);
|
|
#endif
|
|
#if HAVE_REGCMP
|
|
return (pattern == NULL);
|
|
#endif
|
|
#if HAVE_V8_REGCOMP
|
|
return (pattern == NULL);
|
|
#endif
|
|
#if NO_REGEX
|
|
return (pattern == NULL);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Simple pattern matching function.
|
|
* It supports no metacharacters like *, etc.
|
|
*/
|
|
static int
|
|
match(pattern, pattern_len, buf, buf_len, pfound, pend)
|
|
char *pattern;
|
|
int pattern_len;
|
|
char *buf;
|
|
int buf_len;
|
|
char **pfound, **pend;
|
|
{
|
|
char *pp, *lp;
|
|
char *pattern_end = pattern + pattern_len;
|
|
char *buf_end = buf + buf_len;
|
|
|
|
for ( ; buf < buf_end; buf++)
|
|
{
|
|
for (pp = pattern, lp = buf; ; pp++, lp++)
|
|
{
|
|
char cp = *pp;
|
|
char cl = *lp;
|
|
if (caseless == OPT_ONPLUS && ASCII_IS_UPPER(cp))
|
|
cp = ASCII_TO_LOWER(cp);
|
|
if (cp != cl)
|
|
break;
|
|
if (pp == pattern_end || lp == buf_end)
|
|
break;
|
|
}
|
|
if (pp == pattern_end)
|
|
{
|
|
if (pfound != NULL)
|
|
*pfound = buf;
|
|
if (pend != NULL)
|
|
*pend = lp;
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Perform a pattern match with the previously compiled pattern.
|
|
* Set sp and ep to the start and end of the matched string.
|
|
*/
|
|
public int
|
|
match_pattern(pattern, tpattern, line, line_len, sp, ep, notbol, search_type)
|
|
PATTERN_TYPE pattern;
|
|
char *tpattern;
|
|
char *line;
|
|
int line_len;
|
|
char **sp;
|
|
char **ep;
|
|
int notbol;
|
|
int search_type;
|
|
{
|
|
int matched;
|
|
|
|
*sp = *ep = NULL;
|
|
#if NO_REGEX
|
|
search_type |= SRCH_NO_REGEX;
|
|
#endif
|
|
if (search_type & SRCH_NO_REGEX)
|
|
matched = match(tpattern, strlen(tpattern), line, line_len, sp, ep);
|
|
else
|
|
{
|
|
#if HAVE_GNU_REGEX
|
|
{
|
|
struct re_registers search_regs;
|
|
pattern->not_bol = notbol;
|
|
pattern->regs_allocated = REGS_UNALLOCATED;
|
|
matched = re_search(pattern, line, line_len, 0, line_len, &search_regs) >= 0;
|
|
if (matched)
|
|
{
|
|
*sp = line + search_regs.start[0];
|
|
*ep = line + search_regs.end[0];
|
|
}
|
|
}
|
|
#endif
|
|
#if HAVE_POSIX_REGCOMP
|
|
{
|
|
regmatch_t rm;
|
|
int flags = (notbol) ? REG_NOTBOL : 0;
|
|
#ifdef REG_STARTEND
|
|
flags |= REG_STARTEND;
|
|
rm.rm_so = 0;
|
|
rm.rm_eo = line_len;
|
|
#endif
|
|
matched = !regexec(pattern, line, 1, &rm, flags);
|
|
if (matched)
|
|
{
|
|
#ifndef __WATCOMC__
|
|
*sp = line + rm.rm_so;
|
|
*ep = line + rm.rm_eo;
|
|
#else
|
|
*sp = rm.rm_sp;
|
|
*ep = rm.rm_ep;
|
|
#endif
|
|
}
|
|
}
|
|
#endif
|
|
#if HAVE_PCRE
|
|
{
|
|
int flags = (notbol) ? PCRE_NOTBOL : 0;
|
|
int ovector[3];
|
|
matched = pcre_exec(pattern, NULL, line, line_len,
|
|
0, flags, ovector, 3) >= 0;
|
|
if (matched)
|
|
{
|
|
*sp = line + ovector[0];
|
|
*ep = line + ovector[1];
|
|
}
|
|
}
|
|
#endif
|
|
#if HAVE_PCRE2
|
|
{
|
|
int flags = (notbol) ? PCRE2_NOTBOL : 0;
|
|
pcre2_match_data *md = pcre2_match_data_create(3, NULL);
|
|
matched = pcre2_match(pattern, (PCRE2_SPTR)line, line_len,
|
|
0, flags, md, NULL) >= 0;
|
|
if (matched)
|
|
{
|
|
PCRE2_SIZE *ovector = pcre2_get_ovector_pointer(md);
|
|
*sp = line + ovector[0];
|
|
*ep = line + ovector[1];
|
|
}
|
|
pcre2_match_data_free(md);
|
|
}
|
|
#endif
|
|
#if HAVE_RE_COMP
|
|
matched = (re_exec(line) == 1);
|
|
/*
|
|
* re_exec doesn't seem to provide a way to get the matched string.
|
|
*/
|
|
*sp = *ep = NULL;
|
|
#endif
|
|
#if HAVE_REGCMP
|
|
*ep = regex(pattern, line);
|
|
matched = (*ep != NULL);
|
|
if (matched)
|
|
*sp = __loc1;
|
|
#endif
|
|
#if HAVE_V8_REGCOMP
|
|
#if HAVE_REGEXEC2
|
|
matched = regexec2(pattern, line, notbol);
|
|
#else
|
|
matched = regexec(pattern, line);
|
|
#endif
|
|
if (matched)
|
|
{
|
|
*sp = pattern->startp[0];
|
|
*ep = pattern->endp[0];
|
|
}
|
|
#endif
|
|
}
|
|
matched = (!(search_type & SRCH_NO_MATCH) && matched) ||
|
|
((search_type & SRCH_NO_MATCH) && !matched);
|
|
return (matched);
|
|
}
|
|
|
|
/*
|
|
* Return the name of the pattern matching library.
|
|
*/
|
|
public char *
|
|
pattern_lib_name(VOID_PARAM)
|
|
{
|
|
#if HAVE_GNU_REGEX
|
|
return ("GNU");
|
|
#else
|
|
#if HAVE_POSIX_REGCOMP
|
|
return ("POSIX");
|
|
#else
|
|
#if HAVE_PCRE2
|
|
return ("PCRE2");
|
|
#else
|
|
#if HAVE_PCRE
|
|
return ("PCRE");
|
|
#else
|
|
#if HAVE_RE_COMP
|
|
return ("BSD");
|
|
#else
|
|
#if HAVE_REGCMP
|
|
return ("V8");
|
|
#else
|
|
#if HAVE_V8_REGCOMP
|
|
return ("Spencer V8");
|
|
#else
|
|
return ("no");
|
|
#endif
|
|
#endif
|
|
#endif
|
|
#endif
|
|
#endif
|
|
#endif
|
|
#endif
|
|
}
|