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Annotation of mandoc/mdoc_hash.c, Revision 1.12

1.12    ! kristaps    1: /*     $Id: mdoc_hash.c,v 1.11 2009/09/17 07:41:28 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:  */
1.12    ! kristaps   17: #ifdef HAVE_CONFIG_H
        !            18: #include "config.h"
        !            19: #endif
        !            20:
1.8       kristaps   21: #include <sys/types.h>
                     22:
1.1       kristaps   23: #include <assert.h>
                     24: #include <ctype.h>
1.9       kristaps   25: #include <limits.h>
1.1       kristaps   26: #include <stdlib.h>
                     27: #include <stdio.h>
                     28: #include <string.h>
                     29:
                     30: #include "libmdoc.h"
                     31:
1.10      kristaps   32: static u_char           table[27 * 12];
1.6       kristaps   33:
1.11      kristaps   34: /*
                     35:  * XXX - this hash has global scope, so if intended for use as a library
                     36:  * with multiple callers, it will need re-invocation protection.
                     37:  */
1.1       kristaps   38: void
1.9       kristaps   39: mdoc_hash_init(void)
1.1       kristaps   40: {
1.9       kristaps   41:        int              i, j, major;
                     42:        const char      *p;
1.1       kristaps   43:
1.9       kristaps   44:        memset(table, UCHAR_MAX, sizeof(table));
1.1       kristaps   45:
1.5       kristaps   46:        for (i = 0; i < MDOC_MAX; i++) {
1.9       kristaps   47:                p = mdoc_macronames[i];
1.1       kristaps   48:
1.9       kristaps   49:                if (isalpha((u_char)p[1]))
                     50:                        major = 12 * (tolower((u_char)p[1]) - 97);
                     51:                else
                     52:                        major = 12 * 26;
                     53:
                     54:                for (j = 0; j < 12; j++)
                     55:                        if (UCHAR_MAX == table[major + j]) {
1.10      kristaps   56:                                table[major + j] = (u_char)i;
1.9       kristaps   57:                                break;
                     58:                        }
1.1       kristaps   59:
1.9       kristaps   60:                assert(j < 12);
1.1       kristaps   61:        }
                     62: }
                     63:
                     64: int
1.9       kristaps   65: mdoc_hash_find(const char *p)
1.1       kristaps   66: {
1.9       kristaps   67:        int               major, i, j;
1.1       kristaps   68:
1.9       kristaps   69:        if (0 == p[0])
1.6       kristaps   70:                return(MDOC_MAX);
1.9       kristaps   71:        if ( ! isalpha((u_char)p[0]) && '%' != p[0])
1.1       kristaps   72:                return(MDOC_MAX);
1.6       kristaps   73:
1.9       kristaps   74:        if (isalpha((u_char)p[1]))
                     75:                major = 12 * (tolower((u_char)p[1]) - 97);
                     76:        else if ('1' == p[1])
                     77:                major = 12 * 26;
                     78:        else
1.1       kristaps   79:                return(MDOC_MAX);
                     80:
1.9       kristaps   81:        if (p[2] && p[3])
1.1       kristaps   82:                return(MDOC_MAX);
                     83:
1.9       kristaps   84:        for (j = 0; j < 12; j++) {
                     85:                if (UCHAR_MAX == (i = table[major + j]))
                     86:                        break;
                     87:                if (0 == strcmp(p, mdoc_macronames[i]))
                     88:                        return(i);
1.1       kristaps   89:        }
                     90:
                     91:        return(MDOC_MAX);
                     92: }