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/* dstring.c - The dynamic string handling routines used by cpio.
Copyright (C) 1990-1992, 2004, 2007, 2010, 2014-2015, 2017 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 3, 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA. */
#if defined(HAVE_CONFIG_H)
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
#include <string.h>
#else
#include <strings.h>
#endif
#include "dstring.h"
#include <xalloc.h>
/* Initialiaze dynamic string STRING with space for SIZE characters. */
void
ds_init (dynamic_string *string)
{
memset (string, 0, sizeof *string);
}
/* Free the dynamic string storage. */
void
ds_free (dynamic_string *string)
{
free (string->ds_string);
}
/* Expand dynamic string STRING, if necessary. */
void
ds_resize (dynamic_string *string, size_t len)
{
while (len + string->ds_idx >= string->ds_size)
{
string->ds_string = x2nrealloc (string->ds_string, &string->ds_size,
1);
}
}
/* Reset the index of the dynamic string S to LEN. */
void
ds_reset (dynamic_string *s, size_t len)
{
ds_resize (s, len);
s->ds_idx = len;
}
/* 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 (FILE *f, dynamic_string *s, char eos)
{
int next_ch;
/* Initialize. */
s->ds_idx = 0;
/* Read the input string. */
while ((next_ch = getc (f)) != eos && next_ch != EOF)
{
ds_resize (s, 0);
s->ds_string[s->ds_idx++] = next_ch;
}
ds_resize (s, 0);
s->ds_string[s->ds_idx] = '\0';
if (s->ds_idx == 0 && next_ch == EOF)
return NULL;
else
return s->ds_string;
}
void
ds_append (dynamic_string *s, int c)
{
ds_resize (s, 0);
s->ds_string[s->ds_idx] = c;
if (c)
{
s->ds_idx++;
ds_resize (s, 0);
s->ds_string[s->ds_idx] = 0;
}
}
void
ds_concat (dynamic_string *s, char const *str)
{
size_t len = strlen (str);
ds_resize (s, len);
memcpy (s->ds_string + s->ds_idx, str, len);
s->ds_idx += len;
s->ds_string[s->ds_idx] = 0;
}
char *
ds_fgets (FILE *f, dynamic_string *s)
{
return ds_fgetstr (f, s, '\n');
}
char *
ds_fgetname (FILE *f, dynamic_string *s)
{
return ds_fgetstr (f, s, '\0');
}
/* Return true if the dynamic string S ends with character C. */
int
ds_endswith (dynamic_string *s, int c)
{
return (s->ds_idx > 0 && s->ds_string[s->ds_idx - 1] == c);
}
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