Use INTERNAL_SYSCALL.
[glibc.git] / libio / iogetwline.c
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1 /* Copyright (C) 1993,1997,1998,1999,2000,2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA.
19 As a special exception, if you link the code in this file with
20 files compiled with a GNU compiler to produce an executable,
21 that does not cause the resulting executable to be covered by
22 the GNU Lesser General Public License. This exception does not
23 however invalidate any other reasons why the executable file
24 might be covered by the GNU Lesser General Public License.
25 This exception applies to code released by its copyright holders
26 in files containing the exception. */
28 #include "libioP.h"
29 #include <string.h>
30 #include <wchar.h>
32 #ifdef _LIBC
33 # define wmemcpy __wmemcpy
34 #endif
36 #if defined _LIBC || !_G_HAVE_IO_GETLINE_INFO
38 _IO_size_t
39 _IO_getwline (fp, buf, n, delim, extract_delim)
40 _IO_FILE *fp;
41 wchar_t *buf;
42 _IO_size_t n;
43 wint_t delim;
44 int extract_delim;
46 return _IO_getwline_info (fp, buf, n, delim, extract_delim, (wint_t *) 0);
49 /* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
51 Read chars into buf (of size n), until delim is seen.
52 Return number of chars read (at most n).
53 Does not put a terminating '\0' in buf.
54 If extract_delim < 0, leave delimiter unread.
55 If extract_delim > 0, insert delim in output. */
57 _IO_size_t
58 _IO_getwline_info (fp, buf, n, delim, extract_delim, eof)
59 _IO_FILE *fp;
60 wchar_t *buf;
61 _IO_size_t n;
62 wint_t delim;
63 int extract_delim;
64 wint_t *eof;
66 wchar_t *ptr = buf;
67 if (eof != NULL)
68 *eof = 0;
69 if (__builtin_expect (fp->_mode, 1) == 0)
70 _IO_fwide (fp, 1);
71 while (n != 0)
73 _IO_ssize_t len = (fp->_wide_data->_IO_read_end
74 - fp->_wide_data->_IO_read_ptr);
75 if (len <= 0)
77 wint_t wc = __wuflow (fp);
78 if (wc == WEOF)
80 if (eof)
81 *eof = wc;
82 break;
84 if (wc == delim)
86 if (extract_delim > 0)
87 *ptr++ = wc;
88 else if (extract_delim < 0)
89 INTUSE(_IO_sputbackc) (fp, wc);
90 return ptr - buf;
91 if (extract_delim > 0)
92 ++len;
94 *ptr++ = wc;
95 n--;
97 else
99 wchar_t *t;
100 if ((_IO_size_t) len >= n)
101 len = n;
102 t = wmemchr ((void *) fp->_wide_data->_IO_read_ptr, delim, len);
103 if (t != NULL)
105 _IO_size_t old_len = ptr - buf;
106 len = t - fp->_wide_data->_IO_read_ptr;
107 if (extract_delim >= 0)
109 ++t;
110 if (extract_delim > 0)
111 ++len;
113 wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr,
114 len);
115 fp->_wide_data->_IO_read_ptr = t;
116 return old_len + len;
118 wmemcpy ((void *) ptr, (void *) fp->_wide_data->_IO_read_ptr, len);
119 fp->_wide_data->_IO_read_ptr += len;
120 ptr += len;
121 n -= len;
124 return ptr - buf;
127 #endif /* Defined _LIBC || !_G_HAVE_IO_GETLINE_INFO */