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Annotation of mandoc/man_hash.c, Revision 1.13

1.13    ! kristaps    1: /*     $Id: man_hash.c,v 1.12 2009/09/16 14:40:56 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>
1.12      kristaps   18: #include <limits.h>
1.1       kristaps   19: #include <stdlib.h>
                     20: #include <string.h>
                     21:
                     22: #include "libman.h"
                     23:
1.5       kristaps   24:
1.13    ! kristaps   25: static u_char          table[26 * 6];
1.1       kristaps   26:
                     27:
1.12      kristaps   28: void
                     29: man_hash_init(void)
1.1       kristaps   30: {
1.5       kristaps   31:        int              i, j, x;
                     32:
1.12      kristaps   33:        memset(table, UCHAR_MAX, sizeof(table));
1.5       kristaps   34:
1.9       kristaps   35:        for (i = 0; i < MAN_MAX; i++) {
1.5       kristaps   36:                x = man_macronames[i][0];
                     37:                assert((x >= 65 && x <= 90) ||
                     38:                                (x >= 97 && x <= 122));
                     39:
                     40:                x -= (x <= 90) ? 65 : 97;
1.11      kristaps   41:                x *= 6;
1.5       kristaps   42:
1.11      kristaps   43:                for (j = 0; j < 6; j++)
1.12      kristaps   44:                        if (UCHAR_MAX == table[x + j]) {
1.13    ! kristaps   45:                                table[x + j] = (u_char)i;
1.5       kristaps   46:                                break;
                     47:                        }
1.11      kristaps   48:                assert(j < 6);
1.5       kristaps   49:        }
1.1       kristaps   50: }
                     51:
                     52:
                     53: int
1.12      kristaps   54: man_hash_find(const char *tmp)
1.1       kristaps   55: {
1.5       kristaps   56:        int              x, i, tok;
1.2       kristaps   57:
1.5       kristaps   58:        if (0 == (x = tmp[0]))
                     59:                return(MAN_MAX);
                     60:        if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
                     61:                return(MAN_MAX);
                     62:
                     63:        x -= (x <= 90) ? 65 : 97;
1.11      kristaps   64:        x *= 6;
1.5       kristaps   65:
1.11      kristaps   66:        for (i = 0; i < 6; i++) {
1.12      kristaps   67:                if (UCHAR_MAX == (tok = table[x + i]))
1.5       kristaps   68:                        return(MAN_MAX);
                     69:                if (0 == strcmp(tmp, man_macronames[tok]))
                     70:                        return(tok);
                     71:        }
1.1       kristaps   72:
                     73:        return(MAN_MAX);
                     74: }