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