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/*
Crown Copyright (c) 1997
This TenDRA(r) Computer Program is subject to Copyright
owned by the United Kingdom Secretary of State for Defence
acting through the Defence Evaluation and Research Agency
(DERA). It is made available to Recipients with a
royalty-free licence for its use, reproduction, transfer
to other parties and amendment for any purpose not excluding
product development provided that any such use et cetera
shall be deemed to be acceptance of the following conditions:-
(1) Its Recipients shall ensure that this Notice is
reproduced upon any copies or amended versions of it;
(2) Any amended version of it shall be clearly marked to
show both the nature of and the organisation responsible
for the relevant amendment or amendments;
(3) Its onward transfer from a recipient to another
party shall be deemed to be that party's acceptance of
these conditions;
(4) DERA gives no warranty or assurance as to its
quality or suitability for any purpose and DERA accepts
no liability whatsoever in relation to any use to which
it may be put.
*/
#include "config.h"
#if FS_STDARG
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include "c_types.h"
#include "error.h"
#include "buffer.h"
#include "ustring.h"
#include "xalloc.h"
/*
FREE A BUFFER
This routine frees the contents of the buffer bf.
*/
void free_buffer
PROTO_N ( ( bf ) )
PROTO_T ( BUFFER *bf )
{
xfree_nof ( bf->start ) ;
bf->start = NULL ;
bf->posn = NULL ;
bf->end = NULL ;
return ;
}
/*
CLEAR A BUFFER
This routine sets the current position of the buffer bf to the start
of the buffer and sets the buffer file to f. It returns bf.
*/
BUFFER *clear_buffer
PROTO_N ( ( bf, f ) )
PROTO_T ( BUFFER *bf X FILE *f )
{
bf->posn = bf->start ;
bf->file = f ;
return ( bf ) ;
}
/*
OUTPUT THE CONTENTS OF A BUFFER
This routine outputs the content of the buffer bf to the associated
file and resets the position to the start of the buffer. If fl is
true then the file is flushed.
*/
void output_buffer
PROTO_N ( ( bf, fl ) )
PROTO_T ( BUFFER *bf X int fl )
{
FILE *f = bf->file ;
if ( f ) {
string s = bf->start ;
size_t n = ( size_t ) ( bf->posn - s ) ;
if ( n ) {
IGNORE fwrite ( ( gen_ptr ) s, sizeof ( character ), n, f ) ;
if ( fl ) IGNORE fflush_v ( f ) ;
bf->posn = s ;
}
}
return ;
}
/*
EXTEND A BUFFER
This routine extends the buffer bf. s gives a pointer into the buffer,
the corresponding position in the extended buffer is returned.
*/
string extend_buffer
PROTO_N ( ( bf, s ) )
PROTO_T ( BUFFER *bf X string s )
{
string p = bf->start ;
gen_size m = ( gen_size ) ( s - p ) ;
gen_size n = ( gen_size ) ( bf->end - p ) + 500 ;
p = xrealloc_nof ( p, character, n + 12 ) ;
bf->start = p ;
bf->end = p + n ;
return ( p + m ) ;
}
/*
MAKE SPACE IN A BUFFER
This routine makes space for at least m + 1 characters in the buffer
bf following the position s. It returns the corresponding position
in the extended buffer.
*/
string stretch_buffer
PROTO_N ( ( bf, s, m ) )
PROTO_T ( BUFFER *bf X string s X gen_size m )
{
gen_size n = ( gen_size ) ( bf->end - s ) ;
while ( m >= n ) {
s = extend_buffer ( bf, s ) ;
n = ( gen_size ) ( bf->end - s ) ;
}
return ( s ) ;
}
/*
ADD A CHARACTER TO A BUFFER
This routine adds the character c to the buffer bf. Note that bf will
not necessarily be null terminated after this routine.
*/
void bfputc
PROTO_N ( ( bf, c ) )
PROTO_T ( BUFFER *bf X int c )
{
string p = bf->posn ;
if ( p == bf->end ) p = extend_buffer ( bf, p ) ;
*p = ( character ) c ;
bf->posn = p + 1 ;
return ;
}
/*
ADD A STRING TO A BUFFER
This routine adds the string s to the buffer bf. Note that this
guarantees that bf will be null terminated.
*/
void bfputs
PROTO_N ( ( bf, s ) )
PROTO_T ( BUFFER *bf X string s )
{
gen_size m = ( gen_size ) ustrlen ( s ) ;
string p = stretch_buffer ( bf, bf->posn, m ) ;
ustrcpy_v ( p, s ) ;
bf->posn = p + m ;
return ;
}
/*
ADD A FORMATTED STRING TO A BUFFER
This routine adds the string s to the buffer bf, using printf-like
format characters to print the extra arguments. Note that this
guarantees that bf will be null terminated.
*/
void bfprintf
PROTO_V ( ( BUFFER *bf, CONST char *s, ... ) ) /* VARARGS */
{
char c ;
string p ;
gen_size m ;
va_list args ;
#if FS_STDARG
va_start ( args, s ) ;
#else
BUFFER *bf ;
CONST char *s ;
va_start ( args ) ;
bf = va_arg ( args, BUFFER * ) ;
s = va_arg ( args, CONST char * ) ;
#endif
m = ( gen_size ) strlen ( s ) ;
p = stretch_buffer ( bf, bf->posn, m ) ;
/* Scan through format string */
while ( c = *( s++ ), c != 0 ) {
if ( c == '%' ) {
int ext = 0 ;
c = *( s++ ) ;
if ( c == 'l' ) {
c = *( s++ ) ;
ext = 1 ;
}
switch ( c ) {
case 'c' : {
/* '%c' -> character (passed as int) */
int ac = va_arg ( args, int ) ;
*( p++ ) = ( character ) ac ;
break ;
}
case 'd' : {
p = stretch_buffer ( bf, p, ( gen_size ) 50 ) ;
if ( ext ) {
/* '%ld' -> long */
long al = va_arg ( args, long ) ;
sprintf_v ( strlit ( p ), "%ld", al ) ;
} else {
/* '%d' -> int */
int ad = va_arg ( args, int ) ;
sprintf_v ( strlit ( p ), "%d", ad ) ;
}
p = p + ustrlen ( p ) ;
break ;
}
case 's' : {
/* '%s' -> string */
string as = va_arg ( args, string ) ;
if ( as ) {
m = ( gen_size ) ustrlen ( as ) ;
p = stretch_buffer ( bf, p, m ) ;
ustrcpy_v ( p, as ) ;
p += m ;
}
break ;
}
case 'u' : {
p = stretch_buffer ( bf, p, ( gen_size ) 50 ) ;
if ( ext ) {
/* '%lu' -> unsigned long */
unsigned long al = va_arg ( args, unsigned long ) ;
sprintf_v ( strlit ( p ), "%lu", al ) ;
} else {
/* '%u' -> unsigned */
unsigned au = va_arg ( args, unsigned ) ;
sprintf_v ( strlit ( p ), "%u", au ) ;
}
p = p + ustrlen ( p ) ;
break ;
}
case 'x' : {
/* '%x' -> char * */
char *ax = va_arg ( args, char * ) ;
if ( ax ) {
m = ( gen_size ) strlen ( ax ) ;
p = stretch_buffer ( bf, p, m ) ;
ustrcpy_v ( p, ustrlit ( ax ) ) ;
p += m ;
}
break ;
}
case '%' : {
/* '%%' -> percent */
*( p++ ) = ( character ) c ;
break ;
}
default : {
/* Other characters */
FAIL ( Unknown format character ) ;
s = "<ERROR>" ;
break ;
}
}
} else {
*( p++ ) = ( character ) c ;
}
}
*p = 0 ;
bf->posn = p ;
va_end ( args ) ;
return ;
}
/*
READ A STRING FROM A BUFFER
This routine reads at most n characters from the buffer bf into the
string s. It returns the number of characters read.
*/
gen_size bfread
PROTO_N ( ( bf, s, n ) )
PROTO_T ( BUFFER *bf X string s X gen_size n )
{
string p = bf->posn ;
gen_size m = ( gen_size ) ( bf->end - p ) ;
if ( m > n ) m = n ;
if ( m ) {
xumemcpy ( s, p, m ) ;
bf->posn = p + m ;
}
return ( m ) ;
}