1 /* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
2 *
3 * GNU Library General Public License (LGPL) version 2 or later.
4 *
5 * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
6 */
7
8 #include "_stdio.h"
9
10
11 #ifdef __DO_UNLOCKED
12
13
fgets_unlocked(char * __restrict s,int n,register FILE * __restrict stream)14 char *fgets_unlocked(char *__restrict s, int n,
15 register FILE * __restrict stream)
16 {
17 register char *p;
18 int c;
19
20 __STDIO_STREAM_VALIDATE(stream);
21
22 #ifdef __UCLIBC_MJN3_ONLY__
23 #warning CONSIDER: What should fgets do if n <= 0?
24 #endif /* __UCLIBC_MJN3_ONLY__ */
25 /* Should we assert here? Or set errno? Or just fail... */
26 if (n <= 0) {
27 /* __set_errno(EINVAL); */
28 goto ERROR;
29 }
30
31 p = s;
32
33 while (--n) {
34 if (__STDIO_STREAM_CAN_USE_BUFFER_GET(stream)) {
35 if ((*p++ = __STDIO_STREAM_BUFFER_GET(stream)) == '\n') {
36 break;
37 }
38 } else {
39 if ((c = __fgetc_unlocked(stream)) == EOF) {
40 if (__FERROR_UNLOCKED(stream)) {
41 goto ERROR;
42 }
43 break;
44 }
45 if ((*p++ = c) == '\n') {
46 break;
47 }
48 }
49 }
50
51 #ifdef __UCLIBC_MJN3_ONLY__
52 #warning CONSIDER: If n==1 and not at EOF, should fgets return an empty string?
53 #endif /* __UCLIBC_MJN3_ONLY__ */
54 if (p > s) {
55 *p = 0;
56 return s;
57 }
58
59 ERROR:
60 return NULL;
61 }
62 libc_hidden_def(fgets_unlocked)
63
64 #ifndef __UCLIBC_HAS_THREADS__
65 strong_alias(fgets_unlocked,fgets)
66 libc_hidden_def(fgets)
67 #endif
68
69 #elif defined __UCLIBC_HAS_THREADS__
70
71 char *fgets(char *__restrict s, int n,
72 register FILE * __restrict stream)
73 {
74 char *retval;
75 __STDIO_AUTO_THREADLOCK_VAR;
76
77 __STDIO_AUTO_THREADLOCK(stream);
78
79 retval = fgets_unlocked(s, n, stream);
80
81 __STDIO_AUTO_THREADUNLOCK(stream);
82
83 return retval;
84 }
85 libc_hidden_def(fgets)
86
87 #endif
88