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Diffstat (limited to 'maketables.c')
| -rw-r--r-- | maketables.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/maketables.c b/maketables.c new file mode 100644 index 0000000..26a1319 --- /dev/null +++ b/maketables.c @@ -0,0 +1,157 @@ +/************************************************* +* 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 <ph10@cam.ac.uk> + + Copyright (c) 1997 University of Cambridge + +----------------------------------------------------------------------------- +Permission is granted to anyone to use this software for any purpose on any +computer system, and to redistribute it freely, subject to the following +restrictions: + +1. This software is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + +2. The origin of this software must not be misrepresented, either by + explicit claim or by omission. + +3. Altered versions must be plainly marked as such, and must not be + misrepresented as being the original software. +----------------------------------------------------------------------------- + +See the file Tech.Notes for some information on the internals. +*/ + + +/* This is a support program to generate the file chartables.c, containing +character tables of various kinds. They are built according to the local C +locale. */ + +#include <ctype.h> +#include <stdio.h> +#include <string.h> + +#include "internal.h" + +int main(void) +{ +int i; +unsigned char cbits[cbit_length]; + +printf( + "/*************************************************\n" + "* Perl-Compatible Regular Expressions *\n" + "*************************************************/\n\n" + "/* This file is automatically written by the makechartables auxiliary \n" + "program. If you edit it by hand, you might like to edit the Makefile to \n" + "prevent its ever being regenerated. */\n\n" + "/* This table is a lower casing table. */\n\n" + "unsigned char pcre_lcc[] = {\n"); + +printf(" "); +for (i = 0; i < 256; i++) + { + if ((i & 7) == 0 && i != 0) printf("\n "); + printf("%3d", tolower(i)); + if (i != 255) printf(","); + } +printf(" };\n\n"); + +printf( + "/* This table is a case flipping table. */\n\n" + "unsigned char pcre_fcc[] = {\n"); + +printf(" "); +for (i = 0; i < 256; i++) + { + if ((i & 7) == 0 && i != 0) printf("\n "); + printf("%3d", islower(i)? toupper(i) : tolower(i)); + if (i != 255) printf(","); + } +printf(" };\n\n"); + +printf( + "/* This table contains bit maps for digits, letters, 'word' chars, and\n" + "white space. Each map is 32 bytes long and the bits run from the least\n" + "significant end of each byte. */\n\n" + "unsigned char pcre_cbits[] = {\n"); + +memset(cbits, 0, sizeof(cbits)); + +for (i = 0; i < 256; i++) + { + if (isdigit(i)) cbits[cbit_digit + i/8] |= 1 << (i&7); + if (isalpha(i)) cbits[cbit_letter + i/8] |= 1 << (i&7); + if (isalnum(i) || i == '_') + cbits[cbit_word + i/8] |= 1 << (i&7); + if (isspace(i)) cbits[cbit_space + i/8] |= 1 << (i&7); + } + +printf(" "); +for (i = 0; i < cbit_length; i++) + { + if ((i & 7) == 0 && i != 0) + { + if ((i & 31) == 0) printf("\n"); + printf("\n "); + } + printf("0x%02x", cbits[i]); + if (i != cbit_length - 1) printf(","); + } +printf(" };\n\n"); + +printf( + "/* This table identifies various classes of character by individual bits:\n" + " 0x%02x white space character\n" + " 0x%02x letter\n" + " 0x%02x decimal digit\n" + " 0x%02x hexadecimal digit\n" + " 0x%02x alphanumeric or '_'\n" + " 0x%02x regular expression metacharacter or binary zero\n*/\n\n", + ctype_space, ctype_letter, ctype_digit, ctype_xdigit, ctype_word, + ctype_meta); + +printf("unsigned char pcre_ctypes[] = {\n"); + +printf(" "); +for (i = 0; i < 256; i++) + { + int x = 0; + if (isspace(i)) x += ctype_space; + if (isalpha(i)) x += ctype_letter; + if (isdigit(i)) x += ctype_digit; + if (isxdigit(i)) x += ctype_xdigit; + if (isalnum(i) || i == '_') x += ctype_word; + if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta; + + if ((i & 7) == 0 && i != 0) + { + printf(" /* "); + if (isprint(i-8)) printf(" %c -", i-8); + else printf("%3d-", i-8); + if (isprint(i-1)) printf(" %c ", i-1); + else printf("%3d", i-1); + printf(" */\n "); + } + printf("0x%02x", x); + if (i != 255) printf(","); + } + +printf("};/* "); +if (isprint(i-8)) printf(" %c -", i-8); + else printf("%3d-", i-8); +if (isprint(i-1)) printf(" %c ", i-1); + else printf("%3d", i-1); +printf(" */\n\n/* End of chartables.c */\n"); + +return 0; +} + +/* End of maketables.c */ |