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- /* dstring.c - The dynamic string handling routines used by cpio.
- Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include <stdio.h>
- #if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
- #include <string.h>
- #else
- #include <strings.h>
- #endif
- #include "dstring.h"
-
- #if __STDC__
- # define P_(s) s
- #else
- # define P_(s) ()
- #endif
- char *xmalloc P_((unsigned n));
- char *xrealloc P_((char *p, unsigned n));
-
- /* Initialiaze dynamic string STRING with space for SIZE characters. */
-
- void
- ds_init (string, size)
- dynamic_string *string;
- int size;
- {
- string->ds_length = size;
- string->ds_string = (char *) xmalloc (size);
- }
-
- /* Expand dynamic string STRING, if necessary, to hold SIZE characters. */
-
- void
- ds_resize (string, size)
- dynamic_string *string;
- int size;
- {
- if (size > string->ds_length)
- {
- string->ds_length = size;
- string->ds_string = (char *) xrealloc ((char *) string->ds_string, size);
- }
- }
-
- /* Dynamic string S gets a string terminated by the EOS character
- (which is removed) from file F. S will increase
- in size during the function if the string from F is longer than
- the current size of S.
- Return NULL if end of file is detected. Otherwise,
- Return a pointer to the null-terminated string in S. */
-
- char *
- ds_fgetstr (f, s, eos)
- FILE *f;
- dynamic_string *s;
- char eos;
- {
- int insize; /* Amount needed for line. */
- int strsize; /* Amount allocated for S. */
- int next_ch;
-
- /* Initialize. */
- insize = 0;
- strsize = s->ds_length;
-
- /* Read the input string. */
- next_ch = getc (f);
- while (next_ch != eos && next_ch != EOF)
- {
- if (insize >= strsize - 1)
- {
- ds_resize (s, strsize * 2 + 2);
- strsize = s->ds_length;
- }
- s->ds_string[insize++] = next_ch;
- next_ch = getc (f);
- }
- s->ds_string[insize++] = '\0';
-
- if (insize == 1 && next_ch == EOF)
- return NULL;
- else
- return s->ds_string;
- }
-
- char *
- ds_fgets (f, s)
- FILE *f;
- dynamic_string *s;
- {
- return ds_fgetstr (f, s, '\n');
- }
-
- char *
- ds_fgetname (f, s)
- FILE *f;
- dynamic_string *s;
- {
- return ds_fgetstr (f, s, '\0');
- }
-