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6d7e8eda | 1 | /* Copyright (C) 1994-2023 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 | 26 | |
96aa2d94 | 27 | #include <stdlib.h> |
96aa2d94 RM |
28 | #include "libioP.h" |
29 | #include <string.h> | |
30 | #include <errno.h> | |
60160d83 | 31 | #include <limits.h> |
96aa2d94 RM |
32 | |
33 | /* Read up to (and including) a TERMINATOR from FP into *LINEPTR | |
34 | (and null-terminate it). *LINEPTR is a pointer returned from malloc (or | |
35 | NULL), pointing to *N characters of space. It is realloc'ed as | |
36 | necessary. Returns the number of characters read (not including the | |
37 | null terminator), or -1 on error or EOF. */ | |
38 | ||
9964a145 | 39 | ssize_t |
7fcdb532 | 40 | __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp) |
96aa2d94 | 41 | { |
9964a145 ZW |
42 | ssize_t result; |
43 | ssize_t cur_len = 0; | |
44 | ssize_t len; | |
96aa2d94 | 45 | |
96aa2d94 | 46 | CHECK_FILE (fp, -1); |
0261d33f | 47 | _IO_acquire_lock (fp); |
7c713e28 RM |
48 | if (_IO_ferror_unlocked (fp)) |
49 | { | |
50 | result = -1; | |
51 | goto unlock_return; | |
52 | } | |
96aa2d94 | 53 | |
a09183ae AS |
54 | if (lineptr == NULL || n == NULL) |
55 | { | |
56 | __set_errno (EINVAL); | |
57 | fseterr_unlocked (fp); | |
58 | result = -1; | |
59 | goto unlock_return; | |
60 | } | |
61 | ||
96aa2d94 RM |
62 | if (*lineptr == NULL || *n == 0) |
63 | { | |
64 | *n = 120; | |
65 | *lineptr = (char *) malloc (*n); | |
66 | if (*lineptr == NULL) | |
7c713e28 | 67 | { |
a09183ae | 68 | fseterr_unlocked (fp); |
7c713e28 RM |
69 | result = -1; |
70 | goto unlock_return; | |
71 | } | |
96aa2d94 RM |
72 | } |
73 | ||
74 | len = fp->_IO_read_end - fp->_IO_read_ptr; | |
75 | if (len <= 0) | |
76 | { | |
77 | if (__underflow (fp) == EOF) | |
7c713e28 RM |
78 | { |
79 | result = -1; | |
80 | goto unlock_return; | |
81 | } | |
96aa2d94 RM |
82 | len = fp->_IO_read_end - fp->_IO_read_ptr; |
83 | } | |
84 | ||
85 | for (;;) | |
86 | { | |
9964a145 | 87 | size_t needed; |
96aa2d94 RM |
88 | char *t; |
89 | t = (char *) memchr ((void *) fp->_IO_read_ptr, delimiter, len); | |
90 | if (t != NULL) | |
91 | len = (t - fp->_IO_read_ptr) + 1; | |
a1ffb40e | 92 | if (__glibc_unlikely (len >= SSIZE_MAX - cur_len)) |
6cebdfd8 UD |
93 | { |
94 | __set_errno (EOVERFLOW); | |
a09183ae | 95 | fseterr_unlocked (fp); |
6cebdfd8 UD |
96 | result = -1; |
97 | goto unlock_return; | |
98 | } | |
77a58cad | 99 | /* Make enough space for len+1 (for final NUL) bytes. */ |
96aa2d94 RM |
100 | needed = cur_len + len + 1; |
101 | if (needed > *n) | |
102 | { | |
d1dddedf UD |
103 | char *new_lineptr; |
104 | ||
77a58cad | 105 | if (needed < 2 * *n) |
96aa2d94 | 106 | needed = 2 * *n; /* Be generous. */ |
d1dddedf UD |
107 | new_lineptr = (char *) realloc (*lineptr, needed); |
108 | if (new_lineptr == NULL) | |
7c713e28 | 109 | { |
a09183ae | 110 | fseterr_unlocked (fp); |
7c713e28 RM |
111 | result = -1; |
112 | goto unlock_return; | |
113 | } | |
d1dddedf UD |
114 | *lineptr = new_lineptr; |
115 | *n = needed; | |
96aa2d94 RM |
116 | } |
117 | memcpy (*lineptr + cur_len, (void *) fp->_IO_read_ptr, len); | |
118 | fp->_IO_read_ptr += len; | |
119 | cur_len += len; | |
120 | if (t != NULL || __underflow (fp) == EOF) | |
121 | break; | |
122 | len = fp->_IO_read_end - fp->_IO_read_ptr; | |
123 | } | |
77a58cad | 124 | (*lineptr)[cur_len] = '\0'; |
7c713e28 RM |
125 | result = cur_len; |
126 | ||
127 | unlock_return: | |
0261d33f | 128 | _IO_release_lock (fp); |
7c713e28 | 129 | return result; |
96aa2d94 | 130 | } |
7fcdb532 FW |
131 | libc_hidden_def (__getdelim) |
132 | weak_alias (__getdelim, getdelim) |