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Annotation of mandoc/mdoc_hash.c, Revision 1.9

1.9     ! kristaps    1: /*     $Id: mdoc_hash.c,v 1.8 2009/07/20 20:49:22 kristaps Exp $ */
1.1       kristaps    2: /*
1.4       kristaps    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
1.3       kristaps    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:  *
1.3       kristaps    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:  */
1.8       kristaps   17: #include <sys/types.h>
                     18:
1.1       kristaps   19: #include <assert.h>
                     20: #include <ctype.h>
1.9     ! kristaps   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:
1.9     ! kristaps   28: static unsigned char   table[27 * 12];
1.6       kristaps   29:
1.1       kristaps   30:
                     31: void
1.9     ! kristaps   32: mdoc_hash_init(void)
1.1       kristaps   33: {
1.9     ! kristaps   34:        int              i, j, major;
        !            35:        const char      *p;
1.1       kristaps   36:
1.9     ! kristaps   37:        memset(table, UCHAR_MAX, sizeof(table));
1.1       kristaps   38:
1.5       kristaps   39:        for (i = 0; i < MDOC_MAX; i++) {
1.9     ! kristaps   40:                p = mdoc_macronames[i];
1.1       kristaps   41:
1.9     ! kristaps   42:                if (isalpha((u_char)p[1]))
        !            43:                        major = 12 * (tolower((u_char)p[1]) - 97);
        !            44:                else
        !            45:                        major = 12 * 26;
        !            46:
        !            47:                for (j = 0; j < 12; j++)
        !            48:                        if (UCHAR_MAX == table[major + j]) {
        !            49:                                table[major + j] = i;
        !            50:                                break;
        !            51:                        }
1.1       kristaps   52:
1.9     ! kristaps   53:                assert(j < 12);
1.1       kristaps   54:        }
                     55: }
                     56:
                     57:
                     58: int
1.9     ! kristaps   59: mdoc_hash_find(const char *p)
1.1       kristaps   60: {
1.9     ! kristaps   61:        int               major, i, j;
1.1       kristaps   62:
1.9     ! kristaps   63:        if (0 == p[0])
1.6       kristaps   64:                return(MDOC_MAX);
1.9     ! kristaps   65:        if ( ! isalpha((u_char)p[0]) && '%' != p[0])
1.1       kristaps   66:                return(MDOC_MAX);
1.6       kristaps   67:
1.9     ! kristaps   68:        if (isalpha((u_char)p[1]))
        !            69:                major = 12 * (tolower((u_char)p[1]) - 97);
        !            70:        else if ('1' == p[1])
        !            71:                major = 12 * 26;
        !            72:        else
1.1       kristaps   73:                return(MDOC_MAX);
                     74:
1.9     ! kristaps   75:        if (p[2] && p[3])
1.1       kristaps   76:                return(MDOC_MAX);
                     77:
1.9     ! kristaps   78:        for (j = 0; j < 12; j++) {
        !            79:                if (UCHAR_MAX == (i = table[major + j]))
        !            80:                        break;
        !            81:                if (0 == strcmp(p, mdoc_macronames[i]))
        !            82:                        return(i);
1.1       kristaps   83:        }
                     84:
                     85:        return(MDOC_MAX);
                     86: }
                     87: