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Annotation of mandoc/man_hash.c, Revision 1.6

1.6     ! kristaps    1: /* $Id: man_hash.c,v 1.5 2009/04/02 06:51:44 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:
1.6     ! kristaps   42:        htab = calloc(26 * 5, sizeof(int));
1.5       kristaps   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;
1.6     ! kristaps   53:                x *= 5;
1.5       kristaps   54:
1.6     ! kristaps   55:                for (j = 0; j < 5; j++)
1.5       kristaps   56:                        if (0 == htab[x + j]) {
                     57:                                htab[x + j] = i;
                     58:                                break;
                     59:                        }
                     60:
1.6     ! kristaps   61:                assert(j < 5);
1.5       kristaps   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;
1.6     ! kristaps   82:        x *= 5;
1.5       kristaps   83:
1.6     ! kristaps   84:        for (i = 0; i < 5; i++) {
1.5       kristaps   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: