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Annotation of mandoc/man_hash.c, Revision 1.5

1.5     ! kristaps    1: /* $Id: man_hash.c,v 1.4 2009/03/31 13:50:19 kristaps Exp $ */
1.1       kristaps    2: /*
                      3:  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@openbsd.org>
                      4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the
                      7:  * above copyright notice and this permission notice appear in all
                      8:  * copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
                     11:  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
                     12:  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
                     13:  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     14:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     15:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
                     16:  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
                     17:  * PERFORMANCE OF THIS SOFTWARE.
                     18:  */
1.5     ! kristaps   19: #include <assert.h>
1.1       kristaps   20: #include <stdlib.h>
                     21: #include <string.h>
                     22:
                     23: #include "libman.h"
                     24:
1.5     ! kristaps   25:
1.1       kristaps   26: /* ARGUSED */
                     27: void
                     28: man_hash_free(void *htab)
                     29: {
                     30:
1.5     ! kristaps   31:        free(htab);
1.1       kristaps   32: }
                     33:
                     34:
                     35: /* ARGUSED */
                     36: void *
                     37: man_hash_alloc(void)
                     38: {
1.5     ! kristaps   39:        int             *htab;
        !            40:        int              i, j, x;
        !            41:
        !            42:        htab = calloc(26 * 4, sizeof(int));
        !            43:        if (NULL == htab)
        !            44:                return(NULL);
        !            45:
        !            46:        for (i = 1; i < MAN_MAX; i++) {
        !            47:                x = man_macronames[i][0];
        !            48:
        !            49:                assert((x >= 65 && x <= 90) ||
        !            50:                                (x >= 97 && x <= 122));
        !            51:
        !            52:                x -= (x <= 90) ? 65 : 97;
        !            53:                x *= 4;
        !            54:
        !            55:                for (j = 0; j < 4; j++)
        !            56:                        if (0 == htab[x + j]) {
        !            57:                                htab[x + j] = i;
        !            58:                                break;
        !            59:                        }
        !            60:
        !            61:                assert(j < 4);
        !            62:        }
1.1       kristaps   63:
1.5     ! kristaps   64:        return((void *)htab);
1.1       kristaps   65: }
                     66:
                     67:
                     68: int
                     69: man_hash_find(const void *arg, const char *tmp)
                     70: {
1.5     ! kristaps   71:        int              x, i, tok;
        !            72:        const int       *htab;
1.1       kristaps   73:
1.5     ! kristaps   74:        htab = (const int *)arg;
1.2       kristaps   75:
1.5     ! kristaps   76:        if (0 == (x = tmp[0]))
        !            77:                return(MAN_MAX);
        !            78:        if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
        !            79:                return(MAN_MAX);
        !            80:
        !            81:        x -= (x <= 90) ? 65 : 97;
        !            82:        x *= 4;
        !            83:
        !            84:        for (i = 0; i < 4; i++) {
        !            85:                if (0 == (tok = htab[x + i]))
        !            86:                        return(MAN_MAX);
        !            87:                if (0 == strcmp(tmp, man_macronames[tok]))
        !            88:                        return(tok);
        !            89:        }
1.1       kristaps   90:
                     91:        return(MAN_MAX);
                     92: }
                     93: