libmdocml.c

   1 /* $Id: libmdocml.c,v 1.14 2008/11/29 14:14:21 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008 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
   7  * above copyright notice and this permission notice appear in all
   8  * copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <fcntl.h>
  22 #include <err.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include "libmdocml.h"
  29 #include "private.h"
  30
  31 #define BUFFER_LINE      BUFSIZ /* Default line-buffer size. */
  32
  33 static  int      md_run_enter(const struct md_args *,
  34                         struct md_mbuf *, struct md_rbuf *, void *);
  35 static  int      md_run_leave(const struct md_args *, struct md_mbuf *,
  36                         struct md_rbuf *, int, void *);
  37
  38 static  ssize_t  md_buf_fill(struct md_rbuf *);
  39 static  int      md_buf_flush(struct md_mbuf *);
  40
  41
  42 static ssize_t
  43 md_buf_fill(struct md_rbuf *in)
  44 {
  45         ssize_t          ssz;
  46
  47         assert(in);
  48         assert(in->buf);
  49         assert(in->bufsz > 0);
  50         assert(in->name);
  51
  52         if (-1 == (ssz = read(in->fd, in->buf, in->bufsz)))
  53                 warn("%s", in->name);
  54
  55         return(ssz);
  56 }
  57
  58
  59 static int md_buf_flush(struct md_mbuf *buf)
  60 {
  61         ssize_t          sz;
  62
  63         assert(buf);
  64         assert(buf->buf);
  65         assert(buf->name);
  66
  67         if (0 == buf->pos)
  68                 return(1);
  69
  70         sz = write(buf->fd, buf->buf, buf->pos);
  71
  72         if (-1 == sz) {
  73                 warn("%s", buf->name);
  74                 return(0);
  75         } else if ((size_t)sz != buf->pos) {
  76                 warnx("%s: short write", buf->name);
  77                 return(0);
  78         }
  79
  80         buf->pos = 0;
  81         return(1);
  82 }
  83
  84
  85 int
  86 md_buf_putchar(struct md_mbuf *buf, char c)
  87 {
  88
  89         assert(buf);
  90         return(md_buf_puts(buf, &c, 1));
  91 }
  92
  93
  94 int
  95 md_buf_putstring(struct md_mbuf *buf, const char *p)
  96 {
  97
  98         assert(buf);
  99         return(md_buf_puts(buf, p, strlen(p)));
 100 }
 101
 102
 103 int
 104 md_buf_puts(struct md_mbuf *buf, const char *p, size_t sz)
 105 {
 106         size_t           ssz;
 107
 108         assert(p);
 109         assert(buf);
 110         assert(buf->buf);
 111
 112         /* LINTED */
 113         while (buf->pos + sz > buf->bufsz) {
 114                 ssz = buf->bufsz - buf->pos;
 115                 (void)memcpy(/* LINTED */
 116                                 buf->buf + buf->pos, p, ssz);
 117                 p += (long)ssz;
 118                 sz -= ssz;
 119                 buf->pos += ssz;
 120
 121                 if ( ! md_buf_flush(buf))
 122                         return(0);
 123         }
 124
 125         (void)memcpy(/* LINTED */
 126                         buf->buf + buf->pos, p, sz);
 127         buf->pos += sz;
 128         return(1);
 129 }
 130
 131
 132 static int
 133 md_run_leave(const struct md_args *args, struct md_mbuf *mbuf,
 134                 struct md_rbuf *rbuf, int c, void *data)
 135 {
 136         assert(args);
 137         assert(mbuf);
 138         assert(rbuf);
 139
 140         /* Run exiters. */
 141         switch (args->type) {
 142         case (MD_HTML4_STRICT):
 143                 if ( ! md_exit_html4_strict(data, -1 == c ? 0 : 1))
 144                         c = -1;
 145                 break;
 146         default:
 147                 if ( ! md_exit_valid(data, -1 == c ? 0 : 1))
 148                         c = -1;
 149                 break;
 150         }
 151
 152         /* Make final flush of buffer. */
 153         if ( ! md_buf_flush(mbuf))
 154                 return(-1);
 155
 156         return(c);
 157 }
 158
 159
 160 static int
 161 md_run_enter(const struct md_args *args, struct md_mbuf *mbuf,
 162                 struct md_rbuf *rbuf, void *p)
 163 {
 164         ssize_t          sz, i;
 165         char             line[BUFFER_LINE];
 166         size_t           pos;
 167         md_line          fp;
 168
 169         assert(args);
 170         assert(mbuf);
 171         assert(rbuf);
 172
 173         /* Function ptrs to line-parsers. */
 174         switch (args->type) {
 175         case (MD_HTML4_STRICT):
 176                 fp = md_line_html4_strict;
 177                 break;
 178         default:
 179                 fp = md_line_valid;
 180                 break;
 181         }
 182
 183         pos = 0;
 184
 185 again:
 186         if (-1 == (sz = md_buf_fill(rbuf))) {
 187                 return(md_run_leave(args, mbuf, rbuf, -1, p));
 188         } else if (0 == sz && 0 != pos) {
 189                 warnx("%s: no newline at end of file", rbuf->name);
 190                 return(md_run_leave(args, mbuf, rbuf, -1, p));
 191         } else if (0 == sz)
 192                 return(md_run_leave(args, mbuf, rbuf, 0, p));
 193
 194         for (i = 0; i < sz; i++) {
 195                 /*
 196                 if ( ! isascii(rbuf->buf[i])) {
 197                         warnx("%s: non-ascii char (line %zu, col %zu)",
 198                                         rbuf->name, rbuf->line, pos);
 199                         return(md_run_leave(args, mbuf, rbuf, -1, p));
 200                 }
 201                 */
 202                 if ('\n' != rbuf->buf[i]) {
 203                         if (pos < BUFFER_LINE) {
 204                                 /* LINTED */
 205                                 line[pos++] = rbuf->buf[i];
 206                                 continue;
 207                         }
 208                         warnx("%s: line %zu too long",
 209                                         rbuf->name, rbuf->line);
 210                         return(md_run_leave(args, mbuf, rbuf, -1, p));
 211                 }
 212
 213                 line[pos] = 0;
 214                 if ( ! (*fp)(p, line))
 215                         return(md_run_leave(args, mbuf, rbuf, -1, p));
 216                 rbuf->line++;
 217                 pos = 0;
 218         }
 219
 220         goto again;
 221         /* NOTREACHED */
 222 }
 223
 224
 225 int
 226 md_run(const struct md_args *args,
 227                 const struct md_buf *out, const struct md_buf *in)
 228 {
 229         struct md_mbuf   mbuf;
 230         struct md_rbuf   rbuf;
 231         void            *data;
 232
 233         assert(args);
 234         assert(in);
 235         assert(out);
 236
 237         (void)memcpy(&mbuf, out, sizeof(struct md_buf));
 238         (void)memcpy(&rbuf, in, sizeof(struct md_buf));
 239
 240         mbuf.pos = 0;
 241         rbuf.line = 1;
 242
 243         /* Run initialisers. */
 244         switch (args->type) {
 245         case (MD_HTML4_STRICT):
 246                 data = md_init_html4_strict
 247                         (args, &mbuf, &rbuf);
 248                 break;
 249         default:
 250                 data = md_init_valid
 251                         (args, &mbuf, &rbuf);
 252                 break;
 253         }
 254
 255         /* Go into mainline. */
 256         return(md_run_enter(args, &mbuf, &rbuf, data));
 257 }