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Annotation of src/usr.bin/mandoc/man_hash.c, Revision 1.17

1.17    ! schwarze    1: /*     $Id: man_hash.c,v 1.16 2014/03/21 22:17:01 schwarze Exp $ */
1.1       kristaps    2: /*
1.13      schwarze    3:  * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
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:  */
1.7       schwarze   17: #include <sys/types.h>
                     18:
1.1       kristaps   19: #include <assert.h>
1.8       schwarze   20: #include <ctype.h>
1.6       schwarze   21: #include <limits.h>
1.1       kristaps   22: #include <string.h>
                     23:
1.14      schwarze   24: #include "man.h"
1.12      schwarze   25: #include "mandoc.h"
1.1       kristaps   26: #include "libman.h"
                     27:
1.15      schwarze   28: #define        HASH_DEPTH       6
1.8       schwarze   29:
                     30: #define        HASH_ROW(x) do { \
1.15      schwarze   31:                if (isupper((unsigned char)(x))) \
1.8       schwarze   32:                        (x) -= 65; \
                     33:                else \
                     34:                        (x) -= 97; \
                     35:                (x) *= HASH_DEPTH; \
                     36:        } while (/* CONSTCOND */ 0)
                     37:
                     38: /*
                     39:  * Lookup table is indexed first by lower-case first letter (plus one
                     40:  * for the period, which is stored in the last row), then by lower or
                     41:  * uppercase second letter.  Buckets correspond to the index of the
                     42:  * macro (the integer value of the enum stored as a char to save a bit
                     43:  * of space).
                     44:  */
1.15      schwarze   45: static unsigned char    table[26 * HASH_DEPTH];
1.1       kristaps   46:
1.17    ! schwarze   47:
1.6       schwarze   48: /*
                     49:  * XXX - this hash has global scope, so if intended for use as a library
                     50:  * with multiple callers, it will need re-invocation protection.
                     51:  */
1.1       kristaps   52: void
1.6       schwarze   53: man_hash_init(void)
1.1       kristaps   54: {
                     55:        int              i, j, x;
                     56:
1.6       schwarze   57:        memset(table, UCHAR_MAX, sizeof(table));
1.1       kristaps   58:
1.17    ! schwarze   59:        assert(MAN_MAX < UCHAR_MAX);
1.8       schwarze   60:
1.10      schwarze   61:        for (i = 0; i < (int)MAN_MAX; i++) {
1.1       kristaps   62:                x = man_macronames[i][0];
                     63:
1.15      schwarze   64:                assert(isalpha((unsigned char)x));
1.1       kristaps   65:
1.8       schwarze   66:                HASH_ROW(x);
                     67:
                     68:                for (j = 0; j < HASH_DEPTH; j++)
1.6       schwarze   69:                        if (UCHAR_MAX == table[x + j]) {
1.15      schwarze   70:                                table[x + j] = (unsigned char)i;
1.1       kristaps   71:                                break;
                     72:                        }
1.8       schwarze   73:
                     74:                assert(j < HASH_DEPTH);
1.1       kristaps   75:        }
                     76: }
1.8       schwarze   77:
                     78: enum mant
1.6       schwarze   79: man_hash_find(const char *tmp)
1.1       kristaps   80: {
1.8       schwarze   81:        int              x, y, i;
                     82:        enum mant        tok;
1.1       kristaps   83:
1.8       schwarze   84:        if ('\0' == (x = tmp[0]))
1.1       kristaps   85:                return(MAN_MAX);
1.15      schwarze   86:        if ( ! (isalpha((unsigned char)x)))
1.1       kristaps   87:                return(MAN_MAX);
                     88:
1.8       schwarze   89:        HASH_ROW(x);
1.1       kristaps   90:
1.8       schwarze   91:        for (i = 0; i < HASH_DEPTH; i++) {
                     92:                if (UCHAR_MAX == (y = table[x + i]))
1.1       kristaps   93:                        return(MAN_MAX);
1.8       schwarze   94:
                     95:                tok = (enum mant)y;
1.1       kristaps   96:                if (0 == strcmp(tmp, man_macronames[tok]))
                     97:                        return(tok);
                     98:        }
                     99:
                    100:        return(MAN_MAX);
                    101: }