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Annotation of src/usr.bin/mandoc/man_hash.c, Revision 1.6

1.6     ! schwarze    1: /*     $Id: man_hash.c,v 1.5 2009/08/22 23:17:40 schwarze Exp $ */
1.1       kristaps    2: /*
1.2       schwarze    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
1.2       schwarze    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:  *
1.2       schwarze    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:  */
                     17: #include <assert.h>
1.6     ! schwarze   18: #include <limits.h>
1.1       kristaps   19: #include <stdlib.h>
                     20: #include <string.h>
                     21:
                     22: #include "libman.h"
                     23:
1.6     ! schwarze   24: static u_char          table[26 * 6];
1.1       kristaps   25:
1.6     ! schwarze   26: /*
        !            27:  * XXX - this hash has global scope, so if intended for use as a library
        !            28:  * with multiple callers, it will need re-invocation protection.
        !            29:  */
1.1       kristaps   30: void
1.6     ! schwarze   31: man_hash_init(void)
1.1       kristaps   32: {
                     33:        int              i, j, x;
                     34:
1.6     ! schwarze   35:        memset(table, UCHAR_MAX, sizeof(table));
1.1       kristaps   36:
1.3       schwarze   37:        for (i = 0; i < MAN_MAX; i++) {
1.1       kristaps   38:                x = man_macronames[i][0];
                     39:                assert((x >= 65 && x <= 90) ||
                     40:                                (x >= 97 && x <= 122));
                     41:
                     42:                x -= (x <= 90) ? 65 : 97;
1.5       schwarze   43:                x *= 6;
1.1       kristaps   44:
1.5       schwarze   45:                for (j = 0; j < 6; j++)
1.6     ! schwarze   46:                        if (UCHAR_MAX == table[x + j]) {
        !            47:                                table[x + j] = (u_char)i;
1.1       kristaps   48:                                break;
                     49:                        }
1.5       schwarze   50:                assert(j < 6);
1.1       kristaps   51:        }
                     52: }
                     53:
                     54: int
1.6     ! schwarze   55: man_hash_find(const char *tmp)
1.1       kristaps   56: {
                     57:        int              x, i, tok;
                     58:
                     59:        if (0 == (x = tmp[0]))
                     60:                return(MAN_MAX);
                     61:        if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
                     62:                return(MAN_MAX);
                     63:
                     64:        x -= (x <= 90) ? 65 : 97;
1.5       schwarze   65:        x *= 6;
1.1       kristaps   66:
1.5       schwarze   67:        for (i = 0; i < 6; i++) {
1.6     ! schwarze   68:                if (UCHAR_MAX == (tok = table[x + i]))
1.1       kristaps   69:                        return(MAN_MAX);
                     70:                if (0 == strcmp(tmp, man_macronames[tok]))
                     71:                        return(tok);
                     72:        }
                     73:
                     74:        return(MAN_MAX);
                     75: }