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Annotation of src/usr.bin/mandoc/mdoc_hash.c, Revision 1.11

1.11    ! schwarze    1: /*     $Id: mdoc_hash.c,v 1.10 2010/05/23 22:45:00 schwarze Exp $ */
1.1       kristaps    2: /*
1.11    ! schwarze    3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
1.1       kristaps    4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
1.2       schwarze    6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
1.1       kristaps    8:  *
1.2       schwarze    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   16:  */
1.5       schwarze   17: #include <sys/types.h>
                     18:
1.1       kristaps   19: #include <assert.h>
                     20: #include <ctype.h>
1.6       schwarze   21: #include <limits.h>
1.1       kristaps   22: #include <stdlib.h>
                     23: #include <stdio.h>
                     24: #include <string.h>
                     25:
1.10      schwarze   26: #include "mandoc.h"
1.1       kristaps   27: #include "libmdoc.h"
                     28:
1.7       schwarze   29: static u_char           table[27 * 13];
1.1       kristaps   30:
1.6       schwarze   31: /*
                     32:  * XXX - this hash has global scope, so if intended for use as a library
                     33:  * with multiple callers, it will need re-invocation protection.
                     34:  */
1.1       kristaps   35: void
1.6       schwarze   36: mdoc_hash_init(void)
1.1       kristaps   37: {
1.6       schwarze   38:        int              i, j, major;
                     39:        const char      *p;
1.1       kristaps   40:
1.6       schwarze   41:        memset(table, UCHAR_MAX, sizeof(table));
1.1       kristaps   42:
1.9       schwarze   43:        for (i = 0; i < (int)MDOC_MAX; i++) {
1.6       schwarze   44:                p = mdoc_macronames[i];
1.1       kristaps   45:
1.6       schwarze   46:                if (isalpha((u_char)p[1]))
1.7       schwarze   47:                        major = 13 * (tolower((u_char)p[1]) - 97);
1.6       schwarze   48:                else
1.7       schwarze   49:                        major = 13 * 26;
1.6       schwarze   50:
1.7       schwarze   51:                for (j = 0; j < 13; j++)
1.6       schwarze   52:                        if (UCHAR_MAX == table[major + j]) {
                     53:                                table[major + j] = (u_char)i;
                     54:                                break;
                     55:                        }
1.1       kristaps   56:
1.7       schwarze   57:                assert(j < 13);
1.1       kristaps   58:        }
                     59: }
                     60:
1.8       schwarze   61: enum mdoct
1.6       schwarze   62: mdoc_hash_find(const char *p)
1.1       kristaps   63: {
1.6       schwarze   64:        int               major, i, j;
1.1       kristaps   65:
1.6       schwarze   66:        if (0 == p[0])
1.1       kristaps   67:                return(MDOC_MAX);
1.6       schwarze   68:        if ( ! isalpha((u_char)p[0]) && '%' != p[0])
1.4       schwarze   69:                return(MDOC_MAX);
                     70:
1.6       schwarze   71:        if (isalpha((u_char)p[1]))
1.7       schwarze   72:                major = 13 * (tolower((u_char)p[1]) - 97);
1.6       schwarze   73:        else if ('1' == p[1])
1.7       schwarze   74:                major = 13 * 26;
1.6       schwarze   75:        else
1.1       kristaps   76:                return(MDOC_MAX);
                     77:
1.6       schwarze   78:        if (p[2] && p[3])
1.1       kristaps   79:                return(MDOC_MAX);
                     80:
1.7       schwarze   81:        for (j = 0; j < 13; j++) {
1.6       schwarze   82:                if (UCHAR_MAX == (i = table[major + j]))
                     83:                        break;
                     84:                if (0 == strcmp(p, mdoc_macronames[i]))
1.8       schwarze   85:                        return((enum mdoct)i);
1.1       kristaps   86:        }
                     87:
                     88:        return(MDOC_MAX);
                     89: }