fio.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ File operations.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2015 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #undef n_FILE
  36 #define n_FILE fio
  37
  38 #ifndef HAVE_AMALGAMATION
  39 # include "nail.h"
  40 #endif
  41
  42 /* line is a buffer with the result of fgets(). Returns the first newline or
  43  * the last character read */
  44 static size_t     _length_of_line(char const *line, size_t linesize);
  45
  46 /* Read a line, one character at a time */
  47 static char *     _fgetline_byone(char **line, size_t *linesize, size_t *llen,
  48                      FILE *fp, int appendnl, size_t n SMALLOC_DEBUG_ARGS);
  49
  50 /* Workhorse */
  51 static bool_t a_file_lock(int fd, enum n_file_lock_type ft, off_t off, off_t len);
  52
  53 static size_t
  54 _length_of_line(char const *line, size_t linesize)
  55 {
  56    size_t i;
  57    NYD2_ENTER;
  58
  59    /* Last character is always '\0' and was added by fgets() */
  60    for (--linesize, i = 0; i < linesize; i++)
  61       if (line[i] == '\n')
  62          break;
  63    i = (i < linesize) ? i + 1 : linesize;
  64    NYD2_LEAVE;
  65    return i;
  66 }
  67
  68 static char *
  69 _fgetline_byone(char **line, size_t *linesize, size_t *llen, FILE *fp,
  70    int appendnl, size_t n SMALLOC_DEBUG_ARGS)
  71 {
  72    char *rv;
  73    int c;
  74    NYD2_ENTER;
  75
  76    assert(*linesize == 0 || *line != NULL);
  77    for (rv = *line;;) {
  78       if (*linesize <= LINESIZE || n >= *linesize - 128) {
  79          *linesize += ((rv == NULL) ? LINESIZE + n + 1 : 256);
  80          *line = rv = (srealloc)(rv, *linesize SMALLOC_DEBUG_ARGSCALL);
  81       }
  82       c = getc(fp);
  83       if (c != EOF) {
  84          rv[n++] = c;
  85          rv[n] = '\0';
  86          if (c == '\n')
  87             break;
  88       } else {
  89          if (n > 0) {
  90             if (appendnl) {
  91                rv[n++] = '\n';
  92                rv[n] = '\0';
  93             }
  94             break;
  95          } else {
  96             rv = NULL;
  97             goto jleave;
  98          }
  99       }
 100    }
 101    if (llen)
 102       *llen = n;
 103 jleave:
 104    NYD2_LEAVE;
 105    return rv;
 106 }
 107
 108 static bool_t
 109 a_file_lock(int fd, enum n_file_lock_type flt, off_t off, off_t len)
 110 {
 111    struct flock flp;
 112    bool_t rv;
 113    NYD2_ENTER;
 114
 115    memset(&flp, 0, sizeof flp);
 116
 117    switch (flt) {
 118    default:
 119    case FLT_READ:    rv = F_RDLCK;  break;
 120    case FLT_WRITE:   rv = F_WRLCK;  break;
 121    }
 122    flp.l_type = rv;
 123    flp.l_start = off;
 124    flp.l_whence = SEEK_SET;
 125    flp.l_len = len;
 126
 127    rv = (fcntl(fd, F_SETLK, &flp) != -1);
 128    NYD2_LEAVE;
 129    return rv;
 130 }
 131
 132 FL char *
 133 (fgetline)(char **line, size_t *linesize, size_t *cnt, size_t *llen, FILE *fp,
 134    int appendnl SMALLOC_DEBUG_ARGS)
 135 {
 136    size_t i_llen, sz;
 137    char *rv;
 138    NYD2_ENTER;
 139
 140    if (cnt == NULL) {
 141       /* Without count, we can't determine where the chars returned by fgets()
 142        * end if there's no newline.  We have to read one character by one */
 143       rv = _fgetline_byone(line, linesize, llen, fp, appendnl, 0
 144             SMALLOC_DEBUG_ARGSCALL);
 145       goto jleave;
 146    }
 147
 148    if ((rv = *line) == NULL || *linesize < LINESIZE)
 149       *line = rv = (srealloc)(rv, *linesize = LINESIZE SMALLOC_DEBUG_ARGSCALL);
 150    sz = (*linesize <= *cnt) ? *linesize : *cnt + 1;
 151    if (sz <= 1 || fgets(rv, sz, fp) == NULL) {
 152       /* Leave llen untouched; it is used to determine whether the last line
 153        * was \n-terminated in some callers */
 154       rv = NULL;
 155       goto jleave;
 156    }
 157
 158    i_llen = _length_of_line(rv, sz);
 159    *cnt -= i_llen;
 160    while (rv[i_llen - 1] != '\n') {
 161       *line = rv = (srealloc)(rv, *linesize += 256 SMALLOC_DEBUG_ARGSCALL);
 162       sz = *linesize - i_llen;
 163       sz = (sz <= *cnt) ? sz : *cnt + 1;
 164       if (sz <= 1 || fgets(rv + i_llen, sz, fp) == NULL) {
 165          if (appendnl) {
 166             rv[i_llen++] = '\n';
 167             rv[i_llen] = '\0';
 168          }
 169          break;
 170       }
 171       sz = _length_of_line(rv + i_llen, sz);
 172       i_llen += sz;
 173       *cnt -= sz;
 174    }
 175    if (llen)
 176       *llen = i_llen;
 177 jleave:
 178    NYD2_LEAVE;
 179    return rv;
 180 }
 181
 182 FL int
 183 (readline_restart)(FILE *ibuf, char **linebuf, size_t *linesize, size_t n
 184    SMALLOC_DEBUG_ARGS)
 185 {
 186    /* TODO readline_restart(): always *appends* LF just to strip it again;
 187     * TODO should be configurable just as for fgetline(); ..or whatever.. */
 188    int rv = -1;
 189    long sz;
 190    NYD2_ENTER;
 191
 192    clearerr(ibuf);
 193
 194    /* Interrupts will cause trouble if we are inside a stdio call. As this is
 195     * only relevant if input is from tty, bypass it by read(), then */
 196    if (fileno(ibuf) == 0 && (options & OPT_TTYIN)) {
 197       assert(*linesize == 0 || *linebuf != NULL);
 198       for (;;) {
 199          if (*linesize <= LINESIZE || n >= *linesize - 128) {
 200             *linesize += ((*linebuf == NULL) ? LINESIZE + n + 1 : 256);
 201             *linebuf = (srealloc)(*linebuf, *linesize SMALLOC_DEBUG_ARGSCALL);
 202          }
 203 jagain:
 204          sz = read(0, *linebuf + n, *linesize - n - 1);
 205          if (sz > 0) {
 206             n += sz;
 207             (*linebuf)[n] = '\0';
 208             if (n > 0 && (*linebuf)[n - 1] == '\n')
 209                break;
 210          } else {
 211             if (sz < 0 && errno == EINTR)
 212                goto jagain;
 213             if (n > 0) {
 214                if ((*linebuf)[n - 1] != '\n') {
 215                   (*linebuf)[n++] = '\n';
 216                   (*linebuf)[n] = '\0';
 217                }
 218                break;
 219             } else
 220                goto jleave;
 221          }
 222       }
 223    } else {
 224       /* Not reading from standard input or standard input not a terminal. We
 225        * read one char at a time as it is the only way to get lines with
 226        * embedded NUL characters in standard stdio */
 227       if (_fgetline_byone(linebuf, linesize, &n, ibuf, 1, n
 228             SMALLOC_DEBUG_ARGSCALL) == NULL)
 229          goto jleave;
 230    }
 231    if (n > 0 && (*linebuf)[n - 1] == '\n')
 232       (*linebuf)[--n] = '\0';
 233    rv = (int)n;
 234 jleave:
 235    NYD2_LEAVE;
 236    return rv;
 237 }
 238
 239 FL void
 240 setptr(FILE *ibuf, off_t offset)
 241 {
 242    struct message self;
 243    char *cp, *linebuf = NULL;
 244    char const *cp2;
 245    int c, maybe = 1, inhead = 0, selfcnt = 0;
 246    size_t linesize = 0, filesize, cnt;
 247    NYD_ENTER;
 248
 249    memset(&self, 0, sizeof self);
 250    self.m_flag = MUSED | MNEW | MNEWEST;
 251    filesize = mailsize - offset;
 252    offset = ftell(mb.mb_otf);
 253
 254    for (;;) {
 255       if (fgetline(&linebuf, &linesize, &filesize, &cnt, ibuf, 0) == NULL) {
 256          self.m_xsize = self.m_size;
 257          self.m_xlines = self.m_lines;
 258          self.m_have = HAVE_HEADER | HAVE_BODY;
 259          if (selfcnt > 0)
 260             message_append(&self);
 261          message_append_null();
 262          if (linebuf != NULL)
 263             free(linebuf);
 264          break;
 265       }
 266
 267 #ifdef notdef
 268       if (linebuf[0] == '\0')
 269          linebuf[0] = '.';
 270 #endif
 271       /* XXX Convert CRLF to LF; this should be rethought in that
 272        * XXX CRLF input should possibly end as CRLF output? */
 273       if (cnt >= 2 && linebuf[cnt - 1] == '\n' && linebuf[cnt - 2] == '\r')
 274          linebuf[--cnt - 1] = '\n';
 275       fwrite(linebuf, sizeof *linebuf, cnt, mb.mb_otf);
 276       if (ferror(mb.mb_otf)) {
 277          n_perr(_("/tmp"), 0);
 278          exit(EXIT_ERR);
 279       }
 280       if (linebuf[cnt - 1] == '\n')
 281          linebuf[cnt - 1] = '\0';
 282       if (maybe && linebuf[0] == 'F' && is_head(linebuf, cnt, FAL0)) {
 283          /* TODO char date[FROM_DATEBUF];
 284           * TODO extract_date_from_from_(linebuf, cnt, date);
 285           * TODO self.m_time = 10000; */
 286          self.m_xsize = self.m_size;
 287          self.m_xlines = self.m_lines;
 288          self.m_have = HAVE_HEADER | HAVE_BODY;
 289          if (selfcnt++ > 0)
 290             message_append(&self);
 291          msgCount++;
 292          self.m_flag = MUSED | MNEW | MNEWEST;
 293          self.m_size = 0;
 294          self.m_lines = 0;
 295          self.m_block = mailx_blockof(offset);
 296          self.m_offset = mailx_offsetof(offset);
 297          inhead = 1;
 298       } else if (linebuf[0] == 0) {
 299          inhead = 0;
 300       } else if (inhead) {
 301          for (cp = linebuf, cp2 = "status";; ++cp) {
 302             if ((c = *cp2++) == 0) {
 303                while (c = *cp++, whitechar(c))
 304                   ;
 305                if (cp[-1] != ':')
 306                   break;
 307                while ((c = *cp++) != '\0')
 308                   if (c == 'R')
 309                      self.m_flag |= MREAD;
 310                   else if (c == 'O')
 311                      self.m_flag &= ~MNEW;
 312                break;
 313             }
 314             if (*cp != c && *cp != upperconv(c))
 315                break;
 316          }
 317          for (cp = linebuf, cp2 = "x-status";; ++cp) {
 318             if ((c = *cp2++) == 0) {
 319                while ((c = *cp++, whitechar(c)))
 320                   ;
 321                if (cp[-1] != ':')
 322                   break;
 323                while ((c = *cp++) != '\0')
 324                   if (c == 'F')
 325                      self.m_flag |= MFLAGGED;
 326                   else if (c == 'A')
 327                      self.m_flag |= MANSWERED;
 328                   else if (c == 'T')
 329                      self.m_flag |= MDRAFTED;
 330                break;
 331             }
 332             if (*cp != c && *cp != upperconv(c))
 333                break;
 334          }
 335       }
 336       offset += cnt;
 337       self.m_size += cnt;
 338       ++self.m_lines;
 339       maybe = linebuf[0] == 0;
 340    }
 341    NYD_LEAVE;
 342 }
 343
 344 FL int
 345 putline(FILE *obuf, char *linebuf, size_t cnt)
 346 {
 347    int rv = -1;
 348    NYD_ENTER;
 349
 350    fwrite(linebuf, sizeof *linebuf, cnt, obuf);
 351    putc('\n', obuf);
 352    if (!ferror(obuf))
 353       rv = (int)(cnt + 1);
 354    NYD_LEAVE;
 355    return rv;
 356 }
 357
 358 FL off_t
 359 fsize(FILE *iob)
 360 {
 361    struct stat sbuf;
 362    off_t rv;
 363    NYD_ENTER;
 364
 365    rv = (fstat(fileno(iob), &sbuf) == -1) ? 0 : sbuf.st_size;
 366    NYD_LEAVE;
 367    return rv;
 368 }
 369
 370 FL char const *
 371 getdeadletter(void) /* XXX should that be in auxlily.c? */
 372 {
 373    char const *cp_base, *cp;
 374    NYD_ENTER;
 375
 376    cp = fexpand(cp_base = ok_vlook(DEAD), FEXP_LOCAL | FEXP_NSHELL);
 377    if (cp == NULL)
 378       cp = cp_base;
 379    NYD_LEAVE;
 380    return cp;
 381 }
 382
 383 FL bool_t
 384 n_file_lock(int fd, enum n_file_lock_type flt, off_t off, off_t len,
 385    size_t pollmsecs)
 386 {
 387    size_t tries;
 388    bool_t rv;
 389    NYD_ENTER;
 390
 391    for (tries = 0; tries <= FILE_LOCK_TRIES; ++tries)
 392       if ((rv = a_file_lock(fd, flt, off, len)) || pollmsecs == 0)
 393          break;
 394       else
 395          n_msleep(pollmsecs, FAL0);
 396    NYD_LEAVE;
 397    return rv;
 398 }
 399
 400 /* s-it-mode */