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/*
dbuf_string.c - Append formatted string to the dynamic buffer
version 1.2.2, March 20th, 2012
Copyright (c) 2002-2012 Borut Razem
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., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "dbuf_string.h"
/*
* Append string to the end of the buffer.
* The buffer is null terminated.
*/
int
dbuf_append_str (struct dbuf_s *dbuf, const char *str)
{
size_t len;
assert (str != NULL);
len = strlen (str);
if (dbuf_append (dbuf, str, len + 1))
{
--dbuf->len;
return 1;
}
else
return 0;
}
/*
* Prepend string to the beginning of the buffer.
* The buffer is null terminated.
*/
int
dbuf_prepend_str (struct dbuf_s *dbuf, const char *str)
{
size_t len;
assert (str != NULL);
len = strlen (str);
return (dbuf_prepend (dbuf, str, len));
}
/*
* Append single character to the end of the buffer.
* The buffer is null terminated.
*/
int
dbuf_append_char (struct dbuf_s *dbuf, char chr)
{
char buf[2];
buf[0] = chr;
buf[1] = '\0';
if (dbuf_append (dbuf, buf, 2))
{
--dbuf->len;
return 1;
}
else
return 0;
}
/*
* Prepend single character to the end of the buffer.
* The buffer is null terminated.
*/
int
dbuf_prepend_char (struct dbuf_s *dbuf, char chr)
{
char buf[2];
buf[0] = chr;
buf[1] = '\0';
return (dbuf_prepend_str (dbuf, buf));
}
/*
* Append the formatted string to the end of the buffer.
* The buffer is null terminated.
*/
int
dbuf_vprintf (struct dbuf_s *dbuf, const char *format, va_list args)
{
va_list args2;
va_copy (args2, args);
int size = vsnprintf (0, 0, format, args2) + 1;
va_end (args2);
assert (dbuf != NULL);
assert (dbuf->alloc != 0);
assert (dbuf->buf != NULL);
if (0 != _dbuf_expand (dbuf, size))
{
int len = vsprintf (&(((char *)dbuf->buf)[dbuf->len]), format, args);
if (len >= 0)
{
/* if written length is greater then the calculated one,
we have a buffer overrun! */
assert (len <= size);
dbuf->len += len;
}
return len;
}
return 0;
}
/*
* Append the formatted string to the end of the buffer.
* The buffer is null terminated.
*/
int
dbuf_printf (struct dbuf_s *dbuf, const char *format, ...)
{
va_list arg;
int len;
va_start (arg, format);
len = dbuf_vprintf (dbuf, format, arg);
va_end (arg);
return len;
}
/*
* Append line from file to the dynamic buffer
* The buffer is null terminated.
*/
size_t
dbuf_getline (struct dbuf_s *dbuf, FILE *infp)
{
int c;
char chr;
while ((c = getc (infp)) != '\n' && c != EOF)
{
chr = c;
dbuf_append (dbuf, &chr, 1);
}
/* add trailing NL */
if (c == '\n')
{
chr = c;
dbuf_append (dbuf, &chr, 1);
}
/* terminate the line without increasing the length */
if (0 != _dbuf_expand (dbuf, 1))
((char *)dbuf->buf)[dbuf->len] = '\0';
return dbuf_get_length (dbuf);
}
/*
* Remove trailing newline from the string.
* The buffer is null terminated.
* It returns the total number of characters removed.
*/
size_t
dbuf_chomp (struct dbuf_s *dbuf)
{
size_t i = dbuf->len;
size_t ret;
if (i != 0 && '\n' == ((char *)dbuf->buf)[i - 1])
{
--i;
if (i != 0 && '\r' == ((char *)dbuf->buf)[i - 1])
{
--i;
}
}
ret = dbuf->len - i;
dbuf->len = i;
/* terminate the line without increasing the length */
if (_dbuf_expand(dbuf, 1) != 0)
((char *)dbuf->buf)[dbuf->len] = '\0';
return ret;
}
/*
* Write dynamic buffer to the file.
*/
void
dbuf_write (struct dbuf_s *dbuf, FILE *dest)
{
fwrite (dbuf_get_buf (dbuf), 1, dbuf_get_length (dbuf), dest);
}
/*
* Write dynamic buffer to the file and destroy it.
*/
void
dbuf_write_and_destroy (struct dbuf_s *dbuf, FILE *dest)
{
dbuf_write (dbuf, dest);
dbuf_destroy (dbuf);
}
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