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Annotation of mandoc/man_hash.c, Revision 1.15

1.15    ! kristaps    1: /*     $Id: man_hash.c,v 1.14 2009/09/17 07:41:28 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:  */
1.15    ! kristaps   17: #include <sys/types.h>
        !            18:
1.5       kristaps   19: #include <assert.h>
1.12      kristaps   20: #include <limits.h>
1.1       kristaps   21: #include <stdlib.h>
                     22: #include <string.h>
                     23:
                     24: #include "libman.h"
                     25:
1.13      kristaps   26: static u_char          table[26 * 6];
1.1       kristaps   27:
1.14      kristaps   28: /*
                     29:  * XXX - this hash has global scope, so if intended for use as a library
                     30:  * with multiple callers, it will need re-invocation protection.
                     31:  */
1.12      kristaps   32: void
                     33: man_hash_init(void)
1.1       kristaps   34: {
1.5       kristaps   35:        int              i, j, x;
                     36:
1.12      kristaps   37:        memset(table, UCHAR_MAX, sizeof(table));
1.5       kristaps   38:
1.9       kristaps   39:        for (i = 0; i < MAN_MAX; i++) {
1.5       kristaps   40:                x = man_macronames[i][0];
                     41:                assert((x >= 65 && x <= 90) ||
                     42:                                (x >= 97 && x <= 122));
                     43:
                     44:                x -= (x <= 90) ? 65 : 97;
1.11      kristaps   45:                x *= 6;
1.5       kristaps   46:
1.11      kristaps   47:                for (j = 0; j < 6; j++)
1.12      kristaps   48:                        if (UCHAR_MAX == table[x + j]) {
1.13      kristaps   49:                                table[x + j] = (u_char)i;
1.5       kristaps   50:                                break;
                     51:                        }
1.11      kristaps   52:                assert(j < 6);
1.5       kristaps   53:        }
1.1       kristaps   54: }
                     55:
                     56: int
1.12      kristaps   57: man_hash_find(const char *tmp)
1.1       kristaps   58: {
1.5       kristaps   59:        int              x, i, tok;
1.2       kristaps   60:
1.5       kristaps   61:        if (0 == (x = tmp[0]))
                     62:                return(MAN_MAX);
                     63:        if ( ! ((x >= 65 && x <= 90) || (x >= 97 && x <= 122)))
                     64:                return(MAN_MAX);
                     65:
                     66:        x -= (x <= 90) ? 65 : 97;
1.11      kristaps   67:        x *= 6;
1.5       kristaps   68:
1.11      kristaps   69:        for (i = 0; i < 6; i++) {
1.12      kristaps   70:                if (UCHAR_MAX == (tok = table[x + i]))
1.5       kristaps   71:                        return(MAN_MAX);
                     72:                if (0 == strcmp(tmp, man_macronames[tok]))
                     73:                        return(tok);
                     74:        }
1.1       kristaps   75:
                     76:        return(MAN_MAX);
                     77: }

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