| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1993-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 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. |
| 8 | |
| 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. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | As a special exception, if you link the code in this file with |
| 19 | files compiled with a GNU compiler to produce an executable, |
| 20 | that does not cause the resulting executable to be covered by |
| 21 | the GNU Lesser General Public License. This exception does not |
| 22 | however invalidate any other reasons why the executable file |
| 23 | might be covered by the GNU Lesser General Public License. |
| 24 | This exception applies to code released by its copyright holders |
| 25 | in files containing the exception. */ |
| 26 | |
| 27 | #include "libioP.h" |
| 28 | #include <string.h> |
| 29 | |
| 30 | _IO_size_t |
| 31 | _IO_getline (_IO_FILE *fp, char *buf, _IO_size_t n, int delim, |
| 32 | int extract_delim) |
| 33 | { |
| 34 | return _IO_getline_info (fp, buf, n, delim, extract_delim, (int *) 0); |
| 35 | } |
| 36 | libc_hidden_def (_IO_getline) |
| 37 | |
| 38 | /* Algorithm based on that used by Berkeley pre-4.4 fgets implementation. |
| 39 | |
| 40 | Read chars into buf (of size n), until delim is seen. |
| 41 | Return number of chars read (at most n). |
| 42 | Does not put a terminating '\0' in buf. |
| 43 | If extract_delim < 0, leave delimiter unread. |
| 44 | If extract_delim > 0, insert delim in output. */ |
| 45 | |
| 46 | _IO_size_t |
| 47 | _IO_getline_info (_IO_FILE *fp, char *buf, _IO_size_t n, int delim, |
| 48 | int extract_delim, int *eof) |
| 49 | { |
| 50 | char *ptr = buf; |
| 51 | if (eof != NULL) |
| 52 | *eof = 0; |
| 53 | if (__builtin_expect (fp->_mode, -1) == 0) |
| 54 | _IO_fwide (fp, -1); |
| 55 | while (n != 0) |
| 56 | { |
| 57 | _IO_ssize_t len = fp->_IO_read_end - fp->_IO_read_ptr; |
| 58 | if (len <= 0) |
| 59 | { |
| 60 | int c = __uflow (fp); |
| 61 | if (c == EOF) |
| 62 | { |
| 63 | if (eof) |
| 64 | *eof = c; |
| 65 | break; |
| 66 | } |
| 67 | if (c == delim) |
| 68 | { |
| 69 | if (extract_delim > 0) |
| 70 | *ptr++ = c; |
| 71 | else if (extract_delim < 0) |
| 72 | _IO_sputbackc (fp, c); |
| 73 | if (extract_delim > 0) |
| 74 | ++len; |
| 75 | return ptr - buf; |
| 76 | } |
| 77 | *ptr++ = c; |
| 78 | n--; |
| 79 | } |
| 80 | else |
| 81 | { |
| 82 | char *t; |
| 83 | if ((_IO_size_t) len >= n) |
| 84 | len = n; |
| 85 | t = (char *) memchr ((void *) fp->_IO_read_ptr, delim, len); |
| 86 | if (t != NULL) |
| 87 | { |
| 88 | _IO_size_t old_len = ptr-buf; |
| 89 | len = t - fp->_IO_read_ptr; |
| 90 | if (extract_delim >= 0) |
| 91 | { |
| 92 | ++t; |
| 93 | if (extract_delim > 0) |
| 94 | ++len; |
| 95 | } |
| 96 | memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len); |
| 97 | fp->_IO_read_ptr = t; |
| 98 | return old_len + len; |
| 99 | } |
| 100 | memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len); |
| 101 | fp->_IO_read_ptr += len; |
| 102 | ptr += len; |
| 103 | n -= len; |
| 104 | } |
| 105 | } |
| 106 | return ptr - buf; |
| 107 | } |
| 108 | libc_hidden_def (_IO_getline_info) |