464 lines
8.6 KiB
C
464 lines
8.6 KiB
C
/*
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* Copyright (C) 1984-2020 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information, see the README file.
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*/
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/*
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* Routines to do pattern matching.
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*/
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#include "less.h"
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extern int caseless;
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extern int utf_mode;
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/*
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* Compile a search pattern, for future use by match_pattern.
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*/
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static int
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compile_pattern2(pattern, search_type, comp_pattern, show_error)
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char *pattern;
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int search_type;
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PATTERN_TYPE *comp_pattern;
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int show_error;
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{
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if (search_type & SRCH_NO_REGEX)
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return (0);
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{
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#if HAVE_GNU_REGEX
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struct re_pattern_buffer *comp = (struct re_pattern_buffer *)
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ecalloc(1, sizeof(struct re_pattern_buffer));
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re_set_syntax(RE_SYNTAX_POSIX_EXTENDED);
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if (re_compile_pattern(pattern, strlen(pattern), comp))
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{
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free(comp);
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if (show_error)
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error("Invalid pattern", NULL_PARG);
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return (-1);
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}
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if (*comp_pattern != NULL)
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{
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regfree(*comp_pattern);
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free(*comp_pattern);
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}
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*comp_pattern = comp;
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#endif
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#if HAVE_POSIX_REGCOMP
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regex_t *comp = (regex_t *) ecalloc(1, sizeof(regex_t));
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if (regcomp(comp, pattern, REGCOMP_FLAG))
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{
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free(comp);
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if (show_error)
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error("Invalid pattern", NULL_PARG);
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return (-1);
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}
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if (*comp_pattern != NULL)
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{
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regfree(*comp_pattern);
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free(*comp_pattern);
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}
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*comp_pattern = comp;
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#endif
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#if HAVE_PCRE
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constant char *errstring;
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int erroffset;
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PARG parg;
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pcre *comp = pcre_compile(pattern,
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(utf_mode) ? PCRE_UTF8 | PCRE_NO_UTF8_CHECK : 0,
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&errstring, &erroffset, NULL);
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if (comp == NULL)
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{
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parg.p_string = (char *) errstring;
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if (show_error)
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error("%s", &parg);
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return (-1);
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}
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*comp_pattern = comp;
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#endif
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#if HAVE_PCRE2
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int errcode;
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PCRE2_SIZE erroffset;
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PARG parg;
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pcre2_code *comp = pcre2_compile((PCRE2_SPTR)pattern, strlen(pattern),
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0, &errcode, &erroffset, NULL);
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if (comp == NULL)
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{
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if (show_error)
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{
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char msg[160];
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pcre2_get_error_message(errcode, (PCRE2_UCHAR*)msg, sizeof(msg));
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parg.p_string = msg;
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error("%s", &parg);
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}
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return (-1);
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}
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*comp_pattern = comp;
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#endif
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#if HAVE_RE_COMP
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PARG parg;
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if ((parg.p_string = re_comp(pattern)) != NULL)
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{
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if (show_error)
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error("%s", &parg);
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return (-1);
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}
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*comp_pattern = 1;
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#endif
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#if HAVE_REGCMP
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char *comp;
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if ((comp = regcmp(pattern, 0)) == NULL)
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{
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if (show_error)
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error("Invalid pattern", NULL_PARG);
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return (-1);
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}
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if (comp_pattern != NULL)
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free(*comp_pattern);
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*comp_pattern = comp;
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#endif
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#if HAVE_V8_REGCOMP
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struct regexp *comp;
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reg_show_error = show_error;
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comp = regcomp(pattern);
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reg_show_error = 1;
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if (comp == NULL)
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{
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/*
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* regcomp has already printed an error message
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* via regerror().
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*/
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return (-1);
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}
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if (*comp_pattern != NULL)
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free(*comp_pattern);
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*comp_pattern = comp;
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#endif
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}
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return (0);
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}
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/*
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* Like compile_pattern2, but convert the pattern to lowercase if necessary.
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*/
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public int
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compile_pattern(pattern, search_type, comp_pattern)
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char *pattern;
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int search_type;
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PATTERN_TYPE *comp_pattern;
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{
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char *cvt_pattern;
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int result;
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if (caseless != OPT_ONPLUS)
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cvt_pattern = pattern;
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else
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{
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cvt_pattern = (char*) ecalloc(1, cvt_length(strlen(pattern), CVT_TO_LC));
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cvt_text(cvt_pattern, pattern, (int *)NULL, (int *)NULL, CVT_TO_LC);
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}
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result = compile_pattern2(cvt_pattern, search_type, comp_pattern, 1);
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if (cvt_pattern != pattern)
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free(cvt_pattern);
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return (result);
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}
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/*
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* Forget that we have a compiled pattern.
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*/
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public void
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uncompile_pattern(pattern)
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PATTERN_TYPE *pattern;
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{
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#if HAVE_GNU_REGEX
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if (*pattern != NULL)
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{
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regfree(*pattern);
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free(*pattern);
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}
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*pattern = NULL;
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#endif
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#if HAVE_POSIX_REGCOMP
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if (*pattern != NULL)
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{
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regfree(*pattern);
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free(*pattern);
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}
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*pattern = NULL;
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#endif
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#if HAVE_PCRE
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if (*pattern != NULL)
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pcre_free(*pattern);
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*pattern = NULL;
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#endif
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#if HAVE_PCRE2
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if (*pattern != NULL)
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pcre2_code_free(*pattern);
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*pattern = NULL;
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#endif
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#if HAVE_RE_COMP
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*pattern = 0;
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#endif
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#if HAVE_REGCMP
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if (*pattern != NULL)
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free(*pattern);
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*pattern = NULL;
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#endif
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#if HAVE_V8_REGCOMP
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if (*pattern != NULL)
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free(*pattern);
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*pattern = NULL;
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#endif
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}
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/*
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* Can a pattern be successfully compiled?
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*/
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public int
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valid_pattern(pattern)
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char *pattern;
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{
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PATTERN_TYPE comp_pattern;
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int result;
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CLEAR_PATTERN(comp_pattern);
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result = compile_pattern2(pattern, 0, &comp_pattern, 0);
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if (result != 0)
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return (0);
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uncompile_pattern(&comp_pattern);
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return (1);
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}
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/*
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* Is a compiled pattern null?
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*/
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public int
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is_null_pattern(pattern)
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PATTERN_TYPE pattern;
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{
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#if HAVE_GNU_REGEX
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return (pattern == NULL);
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#endif
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#if HAVE_POSIX_REGCOMP
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return (pattern == NULL);
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#endif
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#if HAVE_PCRE
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return (pattern == NULL);
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#endif
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#if HAVE_PCRE2
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return (pattern == NULL);
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#endif
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#if HAVE_RE_COMP
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return (pattern == 0);
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#endif
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#if HAVE_REGCMP
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return (pattern == NULL);
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#endif
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#if HAVE_V8_REGCOMP
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return (pattern == NULL);
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#endif
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#if NO_REGEX
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return (pattern == NULL);
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#endif
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}
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/*
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* Simple pattern matching function.
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* It supports no metacharacters like *, etc.
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*/
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static int
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match(pattern, pattern_len, buf, buf_len, pfound, pend)
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char *pattern;
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int pattern_len;
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char *buf;
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int buf_len;
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char **pfound, **pend;
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{
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char *pp, *lp;
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char *pattern_end = pattern + pattern_len;
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char *buf_end = buf + buf_len;
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for ( ; buf < buf_end; buf++)
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{
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for (pp = pattern, lp = buf; ; pp++, lp++)
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{
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char cp = *pp;
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char cl = *lp;
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if (caseless == OPT_ONPLUS && ASCII_IS_UPPER(cp))
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cp = ASCII_TO_LOWER(cp);
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if (cp != cl)
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break;
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if (pp == pattern_end || lp == buf_end)
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break;
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}
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if (pp == pattern_end)
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{
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if (pfound != NULL)
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*pfound = buf;
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if (pend != NULL)
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*pend = lp;
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return (1);
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}
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}
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return (0);
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}
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/*
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* Perform a pattern match with the previously compiled pattern.
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* Set sp and ep to the start and end of the matched string.
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*/
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public int
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match_pattern(pattern, tpattern, line, line_len, sp, ep, notbol, search_type)
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PATTERN_TYPE pattern;
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char *tpattern;
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char *line;
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int line_len;
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char **sp;
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char **ep;
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int notbol;
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int search_type;
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{
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int matched;
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*sp = *ep = NULL;
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#if NO_REGEX
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search_type |= SRCH_NO_REGEX;
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#endif
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if (search_type & SRCH_NO_REGEX)
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matched = match(tpattern, strlen(tpattern), line, line_len, sp, ep);
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else
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{
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#if HAVE_GNU_REGEX
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{
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struct re_registers search_regs;
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pattern->not_bol = notbol;
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pattern->regs_allocated = REGS_UNALLOCATED;
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matched = re_search(pattern, line, line_len, 0, line_len, &search_regs) >= 0;
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if (matched)
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{
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*sp = line + search_regs.start[0];
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*ep = line + search_regs.end[0];
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}
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}
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#endif
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#if HAVE_POSIX_REGCOMP
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{
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regmatch_t rm;
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int flags = (notbol) ? REG_NOTBOL : 0;
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#ifdef REG_STARTEND
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flags |= REG_STARTEND;
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rm.rm_so = 0;
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rm.rm_eo = line_len;
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#endif
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matched = !regexec(pattern, line, 1, &rm, flags);
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if (matched)
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{
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#ifndef __WATCOMC__
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*sp = line + rm.rm_so;
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*ep = line + rm.rm_eo;
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#else
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*sp = rm.rm_sp;
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*ep = rm.rm_ep;
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#endif
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}
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}
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#endif
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#if HAVE_PCRE
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{
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int flags = (notbol) ? PCRE_NOTBOL : 0;
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int ovector[3];
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matched = pcre_exec(pattern, NULL, line, line_len,
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0, flags, ovector, 3) >= 0;
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if (matched)
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{
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*sp = line + ovector[0];
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*ep = line + ovector[1];
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}
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}
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#endif
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#if HAVE_PCRE2
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{
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int flags = (notbol) ? PCRE2_NOTBOL : 0;
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pcre2_match_data *md = pcre2_match_data_create(3, NULL);
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matched = pcre2_match(pattern, (PCRE2_SPTR)line, line_len,
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0, flags, md, NULL) >= 0;
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if (matched)
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{
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PCRE2_SIZE *ovector = pcre2_get_ovector_pointer(md);
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*sp = line + ovector[0];
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*ep = line + ovector[1];
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}
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pcre2_match_data_free(md);
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}
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#endif
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#if HAVE_RE_COMP
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matched = (re_exec(line) == 1);
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/*
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* re_exec doesn't seem to provide a way to get the matched string.
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*/
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*sp = *ep = NULL;
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#endif
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#if HAVE_REGCMP
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*ep = regex(pattern, line);
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matched = (*ep != NULL);
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if (matched)
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*sp = __loc1;
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#endif
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#if HAVE_V8_REGCOMP
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#if HAVE_REGEXEC2
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matched = regexec2(pattern, line, notbol);
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#else
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matched = regexec(pattern, line);
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#endif
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if (matched)
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{
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*sp = pattern->startp[0];
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*ep = pattern->endp[0];
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}
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#endif
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}
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matched = (!(search_type & SRCH_NO_MATCH) && matched) ||
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((search_type & SRCH_NO_MATCH) && !matched);
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return (matched);
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}
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/*
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* Return the name of the pattern matching library.
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*/
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public char *
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pattern_lib_name(VOID_PARAM)
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{
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#if HAVE_GNU_REGEX
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return ("GNU");
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#else
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#if HAVE_POSIX_REGCOMP
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return ("POSIX");
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#else
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#if HAVE_PCRE2
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return ("PCRE2");
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#else
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#if HAVE_PCRE
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return ("PCRE");
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#else
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#if HAVE_RE_COMP
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return ("BSD");
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#else
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#if HAVE_REGCMP
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return ("V8");
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#else
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#if HAVE_V8_REGCOMP
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return ("Spencer V8");
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#else
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return ("no");
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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}
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