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Annotation of mandoc/man_hash.c, Revision 1.10

1.10    ! kristaps    1: /*     $Id: man_hash.c,v 1.9 2009/06/16 19:55:28 kristaps Exp $ */
1.1       kristaps    2: /*
1.8       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
1.7       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:  *
1.7       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:  */
1.5       kristaps   17: #include <assert.h>
1.1       kristaps   18: #include <stdlib.h>
                     19: #include <string.h>
                     20:
                     21: #include "libman.h"
                     22:
1.5       kristaps   23:
1.1       kristaps   24: /* ARGUSED */
                     25: void
                     26: man_hash_free(void *htab)
                     27: {
                     28:
1.5       kristaps   29:        free(htab);
1.1       kristaps   30: }
                     31:
                     32:
                     33: /* ARGUSED */
                     34: void *
                     35: man_hash_alloc(void)
                     36: {
1.5       kristaps   37:        int             *htab;
                     38:        int              i, j, x;
                     39:
1.10    ! kristaps   40:        /* Initialised to -1. */
        !            41:
        !            42:        htab = malloc(26 * 5 * sizeof(int));
1.5       kristaps   43:        if (NULL == htab)
                     44:                return(NULL);
1.10    ! kristaps   45:        for (i = 0; i < 26 * 5; i++)
        !            46:                htab[i] = -1;
1.5       kristaps   47:
1.9       kristaps   48:        for (i = 0; i < MAN_MAX; i++) {
1.5       kristaps   49:                x = man_macronames[i][0];
                     50:
                     51:                assert((x >= 65 && x <= 90) ||
                     52:                                (x >= 97 && x <= 122));
                     53:
                     54:                x -= (x <= 90) ? 65 : 97;
1.6       kristaps   55:                x *= 5;
1.5       kristaps   56:
1.6       kristaps   57:                for (j = 0; j < 5; j++)
1.10    ! kristaps   58:                        if (-1 == htab[x + j]) {
1.5       kristaps   59:                                htab[x + j] = i;
                     60:                                break;
                     61:                        }
                     62:
1.6       kristaps   63:                assert(j < 5);
1.5       kristaps   64:        }
1.1       kristaps   65:
1.5       kristaps   66:        return((void *)htab);
1.1       kristaps   67: }
                     68:
                     69:
                     70: int
                     71: man_hash_find(const void *arg, const char *tmp)
                     72: {
1.5       kristaps   73:        int              x, i, tok;
                     74:        const int       *htab;
1.1       kristaps   75:
1.5       kristaps   76:        htab = (const int *)arg;
1.2       kristaps   77:
1.5       kristaps   78:        if (0 == (x = tmp[0]))
                     79:                return(MAN_MAX);
                     80:        if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
                     81:                return(MAN_MAX);
                     82:
                     83:        x -= (x <= 90) ? 65 : 97;
1.6       kristaps   84:        x *= 5;
1.5       kristaps   85:
1.6       kristaps   86:        for (i = 0; i < 5; i++) {
1.10    ! kristaps   87:                if (-1 == (tok = htab[x + i]))
1.5       kristaps   88:                        return(MAN_MAX);
                     89:                if (0 == strcmp(tmp, man_macronames[tok]))
                     90:                        return(tok);
                     91:        }
1.1       kristaps   92:
                     93:        return(MAN_MAX);
                     94: }
                     95:

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