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dff8da6b | 1 | /* Copyright (C) 1993-2024 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
96aa2d94 | 3 | |
41bdb6e2 AJ |
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. | |
96aa2d94 | 8 | |
41bdb6e2 AJ |
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 | |
40a55d20 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
96aa2d94 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. |
96aa2d94 | 17 | |
41bdb6e2 AJ |
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. */ | |
96aa2d94 RM |
26 | |
27 | #include "libioP.h" | |
28 | #include <string.h> | |
29 | ||
9964a145 ZW |
30 | size_t |
31 | _IO_getline (FILE *fp, char *buf, size_t n, int delim, | |
f63f2bfd | 32 | int extract_delim) |
0a614877 | 33 | { |
d18ea0c5 | 34 | return _IO_getline_info (fp, buf, n, delim, extract_delim, (int *) 0); |
0a614877 | 35 | } |
d18ea0c5 | 36 | libc_hidden_def (_IO_getline) |
0a614877 | 37 | |
96aa2d94 RM |
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 | ||
9964a145 ZW |
46 | size_t |
47 | _IO_getline_info (FILE *fp, char *buf, size_t n, int delim, | |
f63f2bfd | 48 | int extract_delim, int *eof) |
96aa2d94 | 49 | { |
40a55d20 | 50 | char *ptr = buf; |
0a614877 UD |
51 | if (eof != NULL) |
52 | *eof = 0; | |
076bfcf6 UD |
53 | if (__builtin_expect (fp->_mode, -1) == 0) |
54 | _IO_fwide (fp, -1); | |
00a2f9aa | 55 | while (n != 0) |
96aa2d94 | 56 | { |
9964a145 | 57 | ssize_t len = fp->_IO_read_end - fp->_IO_read_ptr; |
96aa2d94 | 58 | if (len <= 0) |
96aa2d94 | 59 | { |
0a614877 UD |
60 | int c = __uflow (fp); |
61 | if (c == EOF) | |
96aa2d94 | 62 | { |
b5d839c9 UD |
63 | if (eof) |
64 | *eof = c; | |
0a614877 UD |
65 | break; |
66 | } | |
67 | if (c == delim) | |
68 | { | |
69 | if (extract_delim > 0) | |
70 | *ptr++ = c; | |
71 | else if (extract_delim < 0) | |
d18ea0c5 | 72 | _IO_sputbackc (fp, c); |
96aa2d94 | 73 | if (extract_delim > 0) |
40a55d20 | 74 | ++len; |
8da2915d | 75 | return ptr - buf; |
96aa2d94 | 76 | } |
0a614877 UD |
77 | *ptr++ = c; |
78 | n--; | |
96aa2d94 | 79 | } |
b5d839c9 UD |
80 | else |
81 | { | |
82 | char *t; | |
9964a145 | 83 | if ((size_t) len >= n) |
b5d839c9 UD |
84 | len = n; |
85 | t = (char *) memchr ((void *) fp->_IO_read_ptr, delim, len); | |
86 | if (t != NULL) | |
87 | { | |
9964a145 | 88 | size_t old_len = ptr-buf; |
b5d839c9 UD |
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 | } | |
08cac4ac | 105 | } |
96aa2d94 RM |
106 | return ptr - buf; |
107 | } | |
d18ea0c5 | 108 | libc_hidden_def (_IO_getline_info) |