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Annotation of mandoc/chars.c, Revision 1.4

1.4     ! kristaps    1: /*     $Id: chars.c,v 1.3 2009/09/22 10:07:01 kristaps Exp $ */
1.1       kristaps    2: /*
                      3:  * Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se>
                      4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      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.
                     16:  */
                     17: #include <assert.h>
                     18: #include <err.h>
                     19: #include <stdlib.h>
                     20: #include <string.h>
                     21:
                     22: #include "chars.h"
                     23:
1.2       kristaps   24: #define        PRINT_HI         126
                     25: #define        PRINT_LO         32
1.1       kristaps   26:
                     27: struct ln {
                     28:        struct ln        *next;
                     29:        const char       *code;
1.2       kristaps   30:        const char       *ascii;
                     31:        const char       *html;
1.1       kristaps   32:        size_t            codesz;
1.2       kristaps   33:        size_t            asciisz;
                     34:        size_t            htmlsz;
1.1       kristaps   35:        int               type;
                     36: #define        CHARS_CHAR       (1 << 0)
                     37: #define        CHARS_STRING     (1 << 1)
                     38: #define CHARS_BOTH      (0x03)
                     39: };
                     40:
1.4     ! kristaps   41: #define        LINES_MAX         300
1.1       kristaps   42:
1.2       kristaps   43: #define CHAR(w, x, y, z, a, b) \
                     44:        { NULL, (w), (y), (a), (x), (z), (b), CHARS_CHAR },
                     45: #define STRING(w, x, y, z, a, b) \
                     46:        { NULL, (w), (y), (a), (x), (z), (b), CHARS_STRING },
                     47: #define BOTH(w, x, y, z, a, b) \
                     48:        { NULL, (w), (y), (a), (x), (z), (b), CHARS_BOTH },
1.1       kristaps   49:
                     50: static struct ln lines[LINES_MAX] = {
                     51: #include "chars.in"
                     52: };
                     53:
                     54: struct tbl {
1.2       kristaps   55:        enum chars        type;
1.1       kristaps   56:        struct ln       **htab;
                     57: };
                     58:
                     59: static inline int        match(const struct ln *,
                     60:                                const char *, size_t, int);
                     61: static const char       *find(struct tbl *, const char *,
                     62:                                size_t, size_t *, int);
                     63:
                     64:
                     65: void
                     66: chars_free(void *arg)
                     67: {
                     68:        struct tbl      *tab;
                     69:
                     70:        tab = (struct tbl *)arg;
                     71:
                     72:        free(tab->htab);
                     73:        free(tab);
                     74: }
                     75:
                     76:
                     77: void *
                     78: chars_init(enum chars type)
                     79: {
                     80:        struct tbl       *tab;
                     81:        struct ln       **htab;
                     82:        struct ln        *pp;
                     83:        int               i, hash;
                     84:
                     85:        /*
                     86:         * Constructs a very basic chaining hashtable.  The hash routine
                     87:         * is simply the integral value of the first character.
                     88:         * Subsequent entries are chained in the order they're processed
                     89:         * (they're in-line re-ordered during lookup).
                     90:         */
                     91:
                     92:        if (NULL == (tab = malloc(sizeof(struct tbl))))
                     93:                err(1, "malloc");
1.2       kristaps   94:        tab->type = type;
1.1       kristaps   95:
1.2       kristaps   96:        htab = calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln **));
1.1       kristaps   97:        if (NULL == htab)
                     98:                err(1, "malloc");
                     99:
                    100:        for (i = 0; i < LINES_MAX; i++) {
1.2       kristaps  101:                hash = (int)lines[i].code[0] - PRINT_LO;
1.1       kristaps  102:
                    103:                if (NULL == (pp = htab[hash])) {
                    104:                        htab[hash] = &lines[i];
                    105:                        continue;
                    106:                }
                    107:
                    108:                for ( ; pp->next; pp = pp->next)
                    109:                        /* Scan ahead. */ ;
                    110:                pp->next = &lines[i];
                    111:        }
                    112:
                    113:        tab->htab = htab;
                    114:        return(tab);
                    115: }
                    116:
                    117:
                    118: const char *
                    119: chars_a2ascii(void *arg, const char *p, size_t sz, size_t *rsz)
                    120: {
                    121:
                    122:        return(find((struct tbl *)arg, p, sz, rsz, CHARS_CHAR));
                    123: }
                    124:
                    125:
                    126: const char *
                    127: chars_a2res(void *arg, const char *p, size_t sz, size_t *rsz)
                    128: {
                    129:
                    130:        return(find((struct tbl *)arg, p, sz, rsz, CHARS_STRING));
                    131: }
                    132:
                    133:
                    134: static const char *
                    135: find(struct tbl *tab, const char *p, size_t sz, size_t *rsz, int type)
                    136: {
                    137:        struct ln        *pp, *prev;
                    138:        struct ln       **htab;
                    139:        int               hash;
                    140:
                    141:        assert(p);
                    142:        assert(sz > 0);
                    143:
1.2       kristaps  144:        if (p[0] < PRINT_LO || p[0] > PRINT_HI)
1.1       kristaps  145:                return(NULL);
                    146:
                    147:        /*
                    148:         * Lookup the symbol in the symbol hash.  See ascii2htab for the
                    149:         * hashtable specs.  This dynamically re-orders the hash chain
                    150:         * to optimise for repeat hits.
                    151:         */
                    152:
1.2       kristaps  153:        hash = (int)p[0] - PRINT_LO;
1.1       kristaps  154:        htab = tab->htab;
                    155:
                    156:        if (NULL == (pp = htab[hash]))
                    157:                return(NULL);
                    158:
                    159:        if (NULL == pp->next) {
                    160:                if ( ! match(pp, p, sz, type))
                    161:                        return(NULL);
1.2       kristaps  162:
                    163:                if (CHARS_HTML == tab->type) {
                    164:                        *rsz = pp->htmlsz;
                    165:                        return(pp->html);
                    166:                }
                    167:                *rsz = pp->asciisz;
                    168:                return(pp->ascii);
1.1       kristaps  169:        }
                    170:
                    171:        for (prev = NULL; pp; pp = pp->next) {
                    172:                if ( ! match(pp, p, sz, type)) {
                    173:                        prev = pp;
                    174:                        continue;
                    175:                }
                    176:
                    177:                if (prev) {
                    178:                        prev->next = pp->next;
                    179:                        pp->next = htab[hash];
                    180:                        htab[hash] = pp;
                    181:                }
                    182:
1.2       kristaps  183:                if (CHARS_HTML == tab->type) {
                    184:                        *rsz = pp->htmlsz;
                    185:                        return(pp->html);
                    186:                }
                    187:                *rsz = pp->asciisz;
                    188:                return(pp->ascii);
1.1       kristaps  189:        }
                    190:
                    191:        return(NULL);
                    192: }
                    193:
                    194:
                    195: static inline int
                    196: match(const struct ln *ln, const char *p, size_t sz, int type)
                    197: {
                    198:
                    199:        if ( ! (ln->type & type))
                    200:                return(0);
                    201:        if (ln->codesz != sz)
                    202:                return(0);
                    203:        return(0 == strncmp(ln->code, p, sz));
                    204: }

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