1 /******************************************************************************
2 *
3 * Copyright 2015 Google, Inc.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 /************************************************************************************
20 *
21 * Filename: compat.c
22 *
23 * Description: Compatibility functions for non-bionic C libraries
24 *
25 *
26 ***********************************************************************************/
27
28 #include <features.h>
29 #include <string.h>
30 #include <sys/syscall.h>
31 #include <sys/types.h>
32 #include <unistd.h>
33
34 #include "osi/include/compat.h"
35 #include "osi/include/osi.h"
36
37 #if __GLIBC__
38 pid_t
gettid(void)39 gettid(void)
40 {
41 return syscall(SYS_gettid);
42 }
43 #endif
44
45 /* These functions from bionic
46 *
47 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
48 *
49 * Permission to use, copy, modify, and distribute this software for any
50 * purpose with or without fee is hereby granted, provided that the above
51 * copyright notice and this permission notice appear in all copies.
52 *
53 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
54 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
55 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
56 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
57 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
58 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
59 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
60 */
61
62 #if __GLIBC__
63 /*
64 * Copy src to string dst of size siz. At most siz-1 characters
65 * will be copied. Always NUL terminates (unless siz == 0).
66 * Returns strlen(src); if retval >= siz, truncation occurred.
67 */
68 size_t
strlcpy(char * dst,const char * src,size_t siz)69 strlcpy(char *dst, const char *src, size_t siz)
70 {
71 char *d = dst;
72 const char *s = src;
73 size_t n = siz;
74
75 /* Copy as many bytes as will fit */
76 if (n != 0) {
77 while (--n != 0) {
78 if ((*d++ = *s++) == '\0')
79 break;
80 }
81 }
82
83 /* Not enough room in dst, add NUL and traverse rest of src */
84 if (n == 0) {
85 if (siz != 0)
86 *d = '\0'; /* NUL-terminate dst */
87 while (*s++)
88 ;
89 }
90
91 return(s - src - 1); /* count does not include NUL */
92 }
93 #endif
94
95 #if __GLIBC__
96 /*
97 * Appends src to string dst of size siz (unlike strncat, siz is the
98 * full size of dst, not space left). At most siz-1 characters
99 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
100 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
101 * If retval >= siz, truncation occurred.
102 */
103 size_t
strlcat(char * dst,const char * src,size_t siz)104 strlcat(char *dst, const char *src, size_t siz)
105 {
106 char *d = dst;
107 const char *s = src;
108 size_t n = siz;
109 size_t dlen;
110
111 /* Find the end of dst and adjust bytes left but don't go past end */
112 while (n-- != 0 && *d != '\0')
113 d++;
114 dlen = d - dst;
115 n = siz - dlen;
116
117 if (n == 0)
118 return (dlen + strlen(s));
119
120 while (*s != '\0') {
121 if (n != 1) {
122 *d++ = *s;
123 n--;
124 }
125
126 s++;
127 }
128
129 *d = '\0';
130
131 return (dlen + (s - src)); /* count does not include NUL */
132 }
133 #endif
134