Edit File: pcre2_maketables.c
/************************************************* * Perl-Compatible Regular Expressions * *************************************************/ /* PCRE is a library of functions to support regular expressions whose syntax and semantics are as close as possible to those of the Perl 5 language. Written by Philip Hazel Original API code Copyright (c) 1997-2012 University of Cambridge New API code Copyright (c) 2016-2020 University of Cambridge ----------------------------------------------------------------------------- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the University of Cambridge nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ----------------------------------------------------------------------------- */ /* This module contains the external function pcre2_maketables(), which builds character tables for PCRE2 in the current locale. The file is compiled on its own as part of the PCRE2 library. It is also included in the compilation of pcre2_dftables.c as a freestanding program, in which case the macro PCRE2_DFTABLES is defined. */ #ifndef PCRE2_DFTABLES /* Compiling the library */ # ifdef HAVE_CONFIG_H # include "config.h" # endif # include "pcre2_internal.h" #endif /************************************************* * Create PCRE2 character tables * *************************************************/ /* This function builds a set of character tables for use by PCRE2 and returns a pointer to them. They are build using the ctype functions, and consequently their contents will depend upon the current locale setting. When compiled as part of the library, the store is obtained via a general context malloc, if supplied, but when PCRE2_DFTABLES is defined (when compiling the pcre2_dftables freestanding auxiliary program) malloc() is used, and the function has a different name so as not to clash with the prototype in pcre2.h. Arguments: none when PCRE2_DFTABLES is defined else a PCRE2 general context or NULL Returns: pointer to the contiguous block of data else NULL if memory allocation failed */ #ifdef PCRE2_DFTABLES /* Included in freestanding pcre2_dftables program */ static const uint8_t *maketables(void) { uint8_t *yield = (uint8_t *)malloc(TABLES_LENGTH); #else /* Not PCRE2_DFTABLES, that is, compiling the library */ PCRE2_EXP_DEFN const uint8_t * PCRE2_CALL_CONVENTION pcre2_maketables(pcre2_general_context *gcontext) { uint8_t *yield = (uint8_t *)((gcontext != NULL)? gcontext->memctl.malloc(TABLES_LENGTH, gcontext->memctl.memory_data) : malloc(TABLES_LENGTH)); #endif /* PCRE2_DFTABLES */ int i; uint8_t *p; if (yield == NULL) return NULL; p = yield; /* First comes the lower casing table */ for (i = 0; i < 256; i++) *p++ = tolower(i); /* Next the case-flipping table */ for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i); /* Then the character class tables. Don't try to be clever and save effort on exclusive ones - in some locales things may be different. Note that the table for "space" includes everything "isspace" gives, including VT in the default locale. This makes it work for the POSIX class [:space:]. From PCRE1 release 8.34 and for all PCRE2 releases it is also correct for Perl space, because Perl added VT at release 5.18. Note also that it is possible for a character to be alnum or alpha without being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must test for alnum specially. */ memset(p, 0, cbit_length); for (i = 0; i < 256; i++) { if (isdigit(i)) p[cbit_digit + i/8] |= 1u << (i&7); if (isupper(i)) p[cbit_upper + i/8] |= 1u << (i&7); if (islower(i)) p[cbit_lower + i/8] |= 1u << (i&7); if (isalnum(i)) p[cbit_word + i/8] |= 1u << (i&7); if (i == '_') p[cbit_word + i/8] |= 1u << (i&7); if (isspace(i)) p[cbit_space + i/8] |= 1u << (i&7); if (isxdigit(i)) p[cbit_xdigit + i/8] |= 1u << (i&7); if (isgraph(i)) p[cbit_graph + i/8] |= 1u << (i&7); if (isprint(i)) p[cbit_print + i/8] |= 1u << (i&7); if (ispunct(i)) p[cbit_punct + i/8] |= 1u << (i&7); if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1u << (i&7); } p += cbit_length; /* Finally, the character type table. In this, we used to exclude VT from the white space chars, because Perl didn't recognize it as such for \s and for comments within regexes. However, Perl changed at release 5.18, so PCRE1 changed at release 8.34 and it's always been this way for PCRE2. */ for (i = 0; i < 256; i++) { int x = 0; if (isspace(i)) x += ctype_space; if (isalpha(i)) x += ctype_letter; if (islower(i)) x += ctype_lcletter; if (isdigit(i)) x += ctype_digit; if (isalnum(i) || i == '_') x += ctype_word; *p++ = x; } return yield; } #ifndef PCRE2_DFTABLES /* Compiling the library */ PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION pcre2_maketables_free(pcre2_general_context *gcontext, const uint8_t *tables) { if (gcontext) gcontext->memctl.free((void *)tables, gcontext->memctl.memory_data); else free((void *)tables); } #endif /* End of pcre2_maketables.c */