mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-16 20:02:35 +03:00
a1006b9202
git-svn-id: svn://kolibrios.org@3065 a494cfbc-eb01-0410-851d-a64ba20cac60
188 lines
4.6 KiB
C
188 lines
4.6 KiB
C
/*
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by the University of California, Berkeley. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
/*
|
|
FUNCTION
|
|
<<fgets>>---get character string from a file or stream
|
|
|
|
INDEX
|
|
fgets
|
|
INDEX
|
|
_fgets_r
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <stdio.h>
|
|
char *fgets(char *<[buf]>, int <[n]>, FILE *<[fp]>);
|
|
|
|
#include <stdio.h>
|
|
char *_fgets_r(struct _reent *<[ptr]>, char *<[buf]>, int <[n]>, FILE *<[fp]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <stdio.h>
|
|
char *fgets(<[buf]>,<[n]>,<[fp]>)
|
|
char *<[buf]>;
|
|
int <[n]>;
|
|
FILE *<[fp]>;
|
|
|
|
#include <stdio.h>
|
|
char *_fgets_r(<[ptr]>, <[buf]>,<[n]>,<[fp]>)
|
|
struct _reent *<[ptr]>;
|
|
char *<[buf]>;
|
|
int <[n]>;
|
|
FILE *<[fp]>;
|
|
|
|
DESCRIPTION
|
|
Reads at most <[n-1]> characters from <[fp]> until a newline
|
|
is found. The characters including to the newline are stored
|
|
in <[buf]>. The buffer is terminated with a 0.
|
|
|
|
The <<_fgets_r>> function is simply the reentrant version of
|
|
<<fgets>> and is passed an additional reentrancy structure
|
|
pointer: <[ptr]>.
|
|
|
|
RETURNS
|
|
<<fgets>> returns the buffer passed to it, with the data
|
|
filled in. If end of file occurs with some data already
|
|
accumulated, the data is returned with no other indication. If
|
|
no data are read, NULL is returned instead.
|
|
|
|
PORTABILITY
|
|
<<fgets>> should replace all uses of <<gets>>. Note however
|
|
that <<fgets>> returns all of the data, while <<gets>> removes
|
|
the trailing newline (with no indication that it has done so.)
|
|
|
|
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
|
|
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
|
|
*/
|
|
|
|
#include <_ansi.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "local.h"
|
|
|
|
/*
|
|
* Read at most n-1 characters from the given file.
|
|
* Stop when a newline has been read, or the count runs out.
|
|
* Return first argument, or NULL if no characters were read.
|
|
*/
|
|
|
|
char *
|
|
_DEFUN(_fgets_r, (ptr, buf, n, fp),
|
|
struct _reent * ptr _AND
|
|
char *buf _AND
|
|
int n _AND
|
|
FILE * fp)
|
|
{
|
|
size_t len;
|
|
char *s;
|
|
unsigned char *p, *t;
|
|
|
|
if (n < 2) /* sanity check */
|
|
return 0;
|
|
|
|
s = buf;
|
|
|
|
CHECK_INIT(ptr, fp);
|
|
|
|
_flockfile (fp);
|
|
#ifdef __SCLE
|
|
if (fp->_flags & __SCLE)
|
|
{
|
|
int c;
|
|
/* Sorry, have to do it the slow way */
|
|
while (--n > 0 && (c = __sgetc_r (ptr, fp)) != EOF)
|
|
{
|
|
*s++ = c;
|
|
if (c == '\n')
|
|
break;
|
|
}
|
|
if (c == EOF && s == buf)
|
|
{
|
|
_funlockfile (fp);
|
|
return NULL;
|
|
}
|
|
*s = 0;
|
|
_funlockfile (fp);
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
n--; /* leave space for NUL */
|
|
do
|
|
{
|
|
/*
|
|
* If the buffer is empty, refill it.
|
|
*/
|
|
if ((len = fp->_r) <= 0)
|
|
{
|
|
if (__srefill_r (ptr, fp))
|
|
{
|
|
/* EOF: stop with partial or no line */
|
|
if (s == buf)
|
|
{
|
|
_funlockfile (fp);
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
len = fp->_r;
|
|
}
|
|
p = fp->_p;
|
|
|
|
/*
|
|
* Scan through at most n bytes of the current buffer,
|
|
* looking for '\n'. If found, copy up to and including
|
|
* newline, and stop. Otherwise, copy entire chunk
|
|
* and loop.
|
|
*/
|
|
if (len > n)
|
|
len = n;
|
|
t = (unsigned char *) memchr ((_PTR) p, '\n', len);
|
|
if (t != 0)
|
|
{
|
|
len = ++t - p;
|
|
fp->_r -= len;
|
|
fp->_p = t;
|
|
_CAST_VOID memcpy ((_PTR) s, (_PTR) p, len);
|
|
s[len] = 0;
|
|
_funlockfile (fp);
|
|
return (buf);
|
|
}
|
|
fp->_r -= len;
|
|
fp->_p += len;
|
|
_CAST_VOID memcpy ((_PTR) s, (_PTR) p, len);
|
|
s += len;
|
|
}
|
|
while ((n -= len) != 0);
|
|
*s = 0;
|
|
_funlockfile (fp);
|
|
return buf;
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
char *
|
|
_DEFUN(fgets, (buf, n, fp),
|
|
char *buf _AND
|
|
int n _AND
|
|
FILE * fp)
|
|
{
|
|
return _fgets_r (_REENT, buf, n, fp);
|
|
}
|
|
|
|
#endif /* !_REENT_ONLY */
|