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ddc98fbf JK |
1 | /* Utility target functions for GDB, and GDBserver. |
2 | ||
3 | Copyright (C) 2015 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "common-defs.h" | |
21 | #include "target/target-utils.h" | |
9904185c JK |
22 | |
23 | LONGEST | |
24 | read_alloc (gdb_byte **buf_p, int handle, read_alloc_pread_ftype *pread_func, | |
25 | int padding) | |
26 | { | |
27 | size_t buf_alloc, buf_pos; | |
28 | gdb_byte *buf; | |
29 | LONGEST n; | |
30 | int target_errno; | |
31 | ||
32 | /* Start by reading up to 4K at a time. The target will throttle | |
33 | this number down if necessary. */ | |
34 | buf_alloc = 4096; | |
35 | buf = xmalloc (buf_alloc); | |
36 | buf_pos = 0; | |
37 | while (1) | |
38 | { | |
39 | n = pread_func (handle, &buf[buf_pos], buf_alloc - buf_pos - padding, | |
40 | buf_pos, &target_errno); | |
41 | if (n <= 0) | |
42 | { | |
43 | if (n < 0 || (n == 0 && buf_pos == 0)) | |
44 | xfree (buf); | |
45 | else | |
46 | *buf_p = buf; | |
47 | if (n < 0) | |
48 | { | |
49 | /* An error occurred. */ | |
50 | return -1; | |
51 | } | |
52 | else | |
53 | { | |
54 | /* Read all there was. */ | |
55 | return buf_pos; | |
56 | } | |
57 | } | |
58 | ||
59 | buf_pos += n; | |
60 | ||
61 | /* If the buffer is filling up, expand it. */ | |
62 | if (buf_alloc < buf_pos * 2) | |
63 | { | |
64 | buf_alloc *= 2; | |
65 | buf = xrealloc (buf, buf_alloc); | |
66 | } | |
67 | } | |
68 | } | |
69 | ||
70 | char * | |
71 | read_stralloc (struct inferior *inf, const char *filename, | |
72 | read_stralloc_func_ftype *func) | |
73 | { | |
74 | gdb_byte *buffer; | |
75 | char *bufstr; | |
76 | LONGEST i, transferred; | |
77 | ||
78 | transferred = func (inf, filename, &buffer, 1); | |
79 | bufstr = (char *) buffer; | |
80 | ||
81 | if (transferred < 0) | |
82 | return NULL; | |
83 | ||
84 | if (transferred == 0) | |
85 | return xstrdup (""); | |
86 | ||
87 | bufstr[transferred] = 0; | |
88 | ||
89 | /* Check for embedded NUL bytes; but allow trailing NULs. */ | |
90 | for (i = strlen (bufstr); i < transferred; i++) | |
91 | if (bufstr[i] != 0) | |
92 | { | |
93 | warning (_("target file %s " | |
94 | "contained unexpected null characters"), | |
95 | filename); | |
96 | break; | |
97 | } | |
98 | ||
99 | return bufstr; | |
100 | } |