1 /* dstring.c - The dynamic string handling routines used by cpio.
2 Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
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)
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.
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. */
19 #if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
31 char *xmalloc P_((unsigned n));
32 char *xrealloc P_((char *p, unsigned n));
34 /* Initialiaze dynamic string STRING with space for SIZE characters. */
37 ds_init (string, size)
38 dynamic_string *string;
41 string->ds_length = size;
42 string->ds_string = (char *) xmalloc (size);
45 /* Expand dynamic string STRING, if necessary, to hold SIZE characters. */
48 ds_resize (string, size)
49 dynamic_string *string;
52 if (size > string->ds_length)
54 string->ds_length = size;
55 string->ds_string = (char *) xrealloc ((char *) string->ds_string, size);
59 /* Dynamic string S gets a string terminated by the EOS character
60 (which is removed) from file F. S will increase
61 in size during the function if the string from F is longer than
62 the current size of S.
63 Return NULL if end of file is detected. Otherwise,
64 Return a pointer to the null-terminated string in S. */
67 ds_fgetstr (f, s, eos)
72 int insize; /* Amount needed for line. */
73 int strsize; /* Amount allocated for S. */
78 strsize = s->ds_length;
80 /* Read the input string. */
82 while (next_ch != eos && next_ch != EOF)
84 if (insize >= strsize - 1)
86 ds_resize (s, strsize * 2 + 2);
87 strsize = s->ds_length;
89 s->ds_string[insize++] = next_ch;
92 s->ds_string[insize++] = '\0';
94 if (insize == 1 && next_ch == EOF)
105 return ds_fgetstr (f, s, '\n');
113 return ds_fgetstr (f, s, '\0');