1 /*
2 * Replacements for common but usually nonstandard functions that aren't
3 * supplied by all platforms.
4 *
5 * Copyright (C) 2009 by Dan Fandrich <dan@coneharvesters.com>, et. al.
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9 #include "libbb.h"
10
11 #ifndef HAVE_STRCHRNUL
strchrnul(const char * s,int c)12 char* FAST_FUNC strchrnul(const char *s, int c)
13 {
14 while (*s != '\0' && *s != c)
15 s++;
16 return (char*)s;
17 }
18 #endif
19
20 #ifndef HAVE_USLEEP
usleep(unsigned usec)21 int FAST_FUNC usleep(unsigned usec)
22 {
23 struct timespec ts;
24 ts.tv_sec = usec / 1000000u;
25 ts.tv_nsec = (usec % 1000000u) * 1000u;
26 /*
27 * If a signal has non-default handler, nanosleep returns early.
28 * Our version of usleep doesn't return early
29 * if interrupted by such signals:
30 *
31 */
32 while (nanosleep(&ts, &ts) != 0)
33 continue;
34 return 0;
35 }
36 #endif
37
38 #ifndef HAVE_VASPRINTF
vasprintf(char ** string_ptr,const char * format,va_list p)39 int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
40 {
41 int r;
42 va_list p2;
43 char buf[128];
44
45 va_copy(p2, p);
46 r = vsnprintf(buf, 128, format, p);
47 va_end(p);
48
49 /* Note: can't use xstrdup/xmalloc, they call vasprintf (us) on failure! */
50
51 if (r < 128) {
52 va_end(p2);
53 *string_ptr = strdup(buf);
54 return (*string_ptr ? r : -1);
55 }
56
57 *string_ptr = malloc(r+1);
58 r = (*string_ptr ? vsnprintf(*string_ptr, r+1, format, p2) : -1);
59 va_end(p2);
60
61 return r;
62 }
63 #endif
64
65 #ifndef HAVE_DPRINTF
66 /* dprintf is now part of POSIX.1, but was only added in 2008 */
dprintf(int fd,const char * format,...)67 int dprintf(int fd, const char *format, ...)
68 {
69 va_list p;
70 int r;
71 char *string_ptr;
72
73 va_start(p, format);
74 r = vasprintf(&string_ptr, format, p);
75 va_end(p);
76 if (r >= 0) {
77 r = full_write(fd, string_ptr, r);
78 free(string_ptr);
79 }
80 return r;
81 }
82 #endif
83
84 #ifndef HAVE_MEMRCHR
85 /* Copyright (C) 2005 Free Software Foundation, Inc.
86 * memrchr() is a GNU function that might not be available everywhere.
87 * It's basically the inverse of memchr() - search backwards in a
88 * memory block for a particular character.
89 */
memrchr(const void * s,int c,size_t n)90 void* FAST_FUNC memrchr(const void *s, int c, size_t n)
91 {
92 const char *start = s, *end = s;
93
94 end += n - 1;
95
96 while (end >= start) {
97 if (*end == (char)c)
98 return (void *) end;
99 end--;
100 }
101
102 return NULL;
103 }
104 #endif
105
106 #ifndef HAVE_MKDTEMP
107 /* This is now actually part of POSIX.1, but was only added in 2008 */
mkdtemp(char * template)108 char* FAST_FUNC mkdtemp(char *template)
109 {
110 if (mktemp(template) == NULL || mkdir(template, 0700) != 0)
111 return NULL;
112 return template;
113 }
114 #endif
115
116 #ifndef HAVE_STRCASESTR
117 /* Copyright (c) 1999, 2000 The ht://Dig Group */
strcasestr(const char * s,const char * pattern)118 char* FAST_FUNC strcasestr(const char *s, const char *pattern)
119 {
120 int length = strlen(pattern);
121
122 while (*s) {
123 if (strncasecmp(s, pattern, length) == 0)
124 return (char *)s;
125 s++;
126 }
127 return 0;
128 }
129 #endif
130
131 #ifndef HAVE_STRSEP
132 /* Copyright (C) 2004 Free Software Foundation, Inc. */
strsep(char ** stringp,const char * delim)133 char* FAST_FUNC strsep(char **stringp, const char *delim)
134 {
135 char *start = *stringp;
136 char *ptr;
137
138 if (!start)
139 return NULL;
140
141 if (!*delim)
142 ptr = start + strlen(start);
143 else {
144 ptr = strpbrk(start, delim);
145 if (!ptr) {
146 *stringp = NULL;
147 return start;
148 }
149 }
150
151 *ptr = '\0';
152 *stringp = ptr + 1;
153
154 return start;
155 }
156 #endif
157
158 #ifndef HAVE_STPCPY
stpcpy(char * p,const char * to_add)159 char* FAST_FUNC stpcpy(char *p, const char *to_add)
160 {
161 while ((*p = *to_add) != '\0') {
162 p++;
163 to_add++;
164 }
165 return p;
166 }
167 #endif
168
169 #ifndef HAVE_GETLINE
getline(char ** lineptr,size_t * n,FILE * stream)170 ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
171 {
172 int ch;
173 char *line = *lineptr;
174 size_t alloced = *n;
175 size_t len = 0;
176
177 do {
178 ch = fgetc(stream);
179 if (ch == EOF)
180 break;
181 if (len + 1 >= alloced) {
182 alloced += alloced/4 + 64;
183 line = xrealloc(line, alloced);
184 }
185 line[len++] = ch;
186 } while (ch != '\n');
187
188 if (len == 0)
189 return -1;
190
191 line[len] = '\0';
192 *lineptr = line;
193 *n = alloced;
194 return len;
195 }
196 #endif
197
198 #ifndef HAVE_TTYNAME_R
ttyname_r(int fd,char * buf,size_t buflen)199 int ttyname_r(int fd, char *buf, size_t buflen)
200 {
201 int r;
202 char path[sizeof("/proc/self/fd/%d") + sizeof(int)*3];
203
204 if (!isatty(fd))
205 return errno == EINVAL ? ENOTTY : errno;
206 sprintf(path, "/proc/self/fd/%d", fd);
207 r = readlink(path, buf, buflen);
208 if (r < 0)
209 return errno;
210 if (r >= buflen)
211 return ERANGE;
212 buf[r] = '\0';
213 return 0;
214 }
215 #endif
216