contrib/cpio/dstring.h

   1 /* dstring.h - Dynamic string handling include file.  Requires strings.h.
   2    Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 #ifndef NULL
  19 #define NULL 0
  20 #endif
  21
  22 /* A dynamic string consists of record that records the size of an
  23    allocated string and the pointer to that string.  The actual string
  24    is a normal zero byte terminated string that can be used with the
  25    usual string functions.  The major difference is that the
  26    dynamic_string routines know how to get more space if it is needed
  27    by allocating new space and copying the current string.  */
  28
  29 typedef struct
  30 {
  31   int ds_length;                /* Actual amount of storage allocated.  */
  32   char *ds_string;              /* String.  */
  33 } dynamic_string;
  34
  35
  36 /* Macros that look similar to the original string functions.
  37    WARNING:  These macros work only on pointers to dynamic string records.
  38    If used with a real record, an "&" must be used to get the pointer.  */
  39 #define ds_strlen(s)            strlen ((s)->ds_string)
  40 #define ds_strcmp(s1, s2)       strcmp ((s1)->ds_string, (s2)->ds_string)
  41 #define ds_strncmp(s1, s2, n)   strncmp ((s1)->ds_string, (s2)->ds_string, n)
  42 #define ds_index(s, c)          index ((s)->ds_string, c)
  43 #define ds_rindex(s, c)         rindex ((s)->ds_string, c)
  44
  45 void ds_init ();
  46 void ds_resize ();
  47 char *ds_fgetname ();
  48 char *ds_fgets ();
  49 char *ds_fgetstr ();