mdw@git.distorted.org.uk Git - disorder/blob - lib/inputline.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2007, 2008 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20 /** @file lib/inputline.c
  21  * @brief Line input
  22  */
  23
  24 #include <config.h>
  25 #include "types.h"
  26
  27 #include <stdio.h>
  28 #include <errno.h>
  29 #include <string.h>
  30
  31 #include "log.h"
  32 #include "mem.h"
  33 #include "vector.h"
  34 #include "charset.h"
  35 #include "inputline.h"
  36
  37 /** @brief Read a line from @p fp
  38  * @param tag Used in error messages
  39  * @param fp Stream to read from
  40  * @param lp Where to store newly allocated string
  41  * @param newline Newline character or @ref CRLF
  42  * @return 0 on success, -1 on error or eof.
  43  *
  44  * The newline is not included in the string.  If the last line of a
  45  * stream does not have a newline then that line is still returned.
  46  *
  47  * If @p newline is @ref CRLF then the line is terminated by CR LF,
  48  * not by a single newline character.  The CRLF is still not included
  49  * in the string in this case.
  50  *
  51  * @p *lp is only set if the return value was 0.
  52  */
  53 int inputline(const char *tag, FILE *fp, char **lp, int newline) {
  54   struct dynstr d;
  55   int ch;
  56
  57   dynstr_init(&d);
  58   while((ch = getc(fp)),
  59         (!ferror(fp) && !feof(fp) && ch != newline)) {
  60     dynstr_append(&d, ch);
  61     if(newline == CRLF && d.nvec >= 2
  62        && d.vec[d.nvec - 2] == 0x0D && d.vec[d.nvec - 1] == 0x0A) {
  63       d.nvec -= 2;
  64       break;
  65     }
  66   }
  67   if(ferror(fp)) {
  68     error(errno, "error reading %s", tag);
  69     return -1;
  70   } else if(feof(fp)) {
  71     if(d.nvec != 0)
  72       error(0, "error reading %s: unexpected EOF", tag);
  73     return -1;
  74   }
  75   dynstr_terminate(&d);
  76   *lp = d.vec;
  77   return 0;
  78 }
  79
  80 /*
  81 Local Variables:
  82 c-basic-offset:2
  83 comment-column:40
  84 End:
  85 */