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Annotation of src/usr.bin/mandoc/mdoc_hash.c, Revision 1.7

1.7     ! schwarze    1: /*     $Id: mdoc_hash.c,v 1.6 2009/09/21 21:11:37 schwarze Exp $ */
1.1       kristaps    2: /*
1.2       schwarze    3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
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:
                     26: #include "libmdoc.h"
                     27:
1.7     ! schwarze   28: static u_char           table[27 * 13];
1.1       kristaps   29:
1.6       schwarze   30: /*
                     31:  * XXX - this hash has global scope, so if intended for use as a library
                     32:  * with multiple callers, it will need re-invocation protection.
                     33:  */
1.1       kristaps   34: void
1.6       schwarze   35: mdoc_hash_init(void)
1.1       kristaps   36: {
1.6       schwarze   37:        int              i, j, major;
                     38:        const char      *p;
1.1       kristaps   39:
1.6       schwarze   40:        memset(table, UCHAR_MAX, sizeof(table));
1.1       kristaps   41:
1.3       schwarze   42:        for (i = 0; i < MDOC_MAX; i++) {
1.6       schwarze   43:                p = mdoc_macronames[i];
1.1       kristaps   44:
1.6       schwarze   45:                if (isalpha((u_char)p[1]))
1.7     ! schwarze   46:                        major = 13 * (tolower((u_char)p[1]) - 97);
1.6       schwarze   47:                else
1.7     ! schwarze   48:                        major = 13 * 26;
1.6       schwarze   49:
1.7     ! schwarze   50:                for (j = 0; j < 13; j++)
1.6       schwarze   51:                        if (UCHAR_MAX == table[major + j]) {
                     52:                                table[major + j] = (u_char)i;
                     53:                                break;
                     54:                        }
1.1       kristaps   55:
1.7     ! schwarze   56:                assert(j < 13);
1.1       kristaps   57:        }
                     58: }
                     59:
                     60: int
1.6       schwarze   61: mdoc_hash_find(const char *p)
1.1       kristaps   62: {
1.6       schwarze   63:        int               major, i, j;
1.1       kristaps   64:
1.6       schwarze   65:        if (0 == p[0])
1.1       kristaps   66:                return(MDOC_MAX);
1.6       schwarze   67:        if ( ! isalpha((u_char)p[0]) && '%' != p[0])
1.4       schwarze   68:                return(MDOC_MAX);
                     69:
1.6       schwarze   70:        if (isalpha((u_char)p[1]))
1.7     ! schwarze   71:                major = 13 * (tolower((u_char)p[1]) - 97);
1.6       schwarze   72:        else if ('1' == p[1])
1.7     ! schwarze   73:                major = 13 * 26;
1.6       schwarze   74:        else
1.1       kristaps   75:                return(MDOC_MAX);
                     76:
1.6       schwarze   77:        if (p[2] && p[3])
1.1       kristaps   78:                return(MDOC_MAX);
                     79:
1.7     ! schwarze   80:        for (j = 0; j < 13; j++) {
1.6       schwarze   81:                if (UCHAR_MAX == (i = table[major + j]))
                     82:                        break;
                     83:                if (0 == strcmp(p, mdoc_macronames[i]))
                     84:                        return(i);
1.1       kristaps   85:        }
                     86:
                     87:        return(MDOC_MAX);
                     88: }