1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 * Copyright (C) 2006 Rob Landley
7 * Copyright (C) 2006 Denys Vlasenko
9 * Licensed under GPLv2, see file LICENSE in this source tree.
12 /* We need to have separate xfuncs.c and xfuncs_printf.c because
13 * with current linkers, even with section garbage collection,
14 * if *.o module references any of XXXprintf functions, you pull in
15 * entire printf machinery. Even if you do not use the function
16 * which uses XXXprintf.
18 * xfuncs.c contains functions (not necessarily xfuncs)
19 * which do not pull in printf, directly or indirectly.
20 * xfunc_printf.c contains those which do.
22 * TODO: move xmalloc() and xatonum() here.
27 /* Turn on nonblocking I/O on a fd */
28 void FAST_FUNC ndelay_on(int fd)
30 int flags = fcntl(fd, F_GETFL);
31 if (flags & O_NONBLOCK)
33 fcntl(fd, F_SETFL, flags | O_NONBLOCK);
36 void FAST_FUNC ndelay_off(int fd)
38 int flags = fcntl(fd, F_GETFL);
39 if (!(flags & O_NONBLOCK))
41 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
44 void FAST_FUNC close_on_exec_on(int fd)
46 fcntl(fd, F_SETFD, FD_CLOEXEC);
49 char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
52 enum { IFNAMSIZ = 16 };
54 return strncpy(dst, src, IFNAMSIZ);
58 /* Convert unsigned integer to ascii, writing into supplied buffer.
59 * A truncated result contains the first few digits of the result ala strncpy.
60 * Returns a pointer past last generated digit, does _not_ store NUL.
62 void BUG_sizeof(void);
63 char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
70 // 2^32-1 = 4294967295
72 #if UINT_MAX > 4294967295 /* prevents warning about "const too large" */
75 // 2^64-1 = 18446744073709551615
76 i = 10000000000000000000;
83 if (res || out || i == 1) {
94 /* Convert signed integer to ascii, like utoa_to_buf() */
95 char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
104 return utoa_to_buf((unsigned)n, buf, buflen);
107 // The following two functions use a static buffer, so calling either one a
108 // second time will overwrite previous results.
110 // The largest 32 bit integer is -2 billion plus NUL, or 1+10+1=12 bytes.
111 // It so happens that sizeof(int) * 3 is enough for 32+ bit ints.
112 // (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
114 static char local_buf[sizeof(int) * 3];
116 /* Convert unsigned integer to ascii using a static buffer (returned). */
117 char* FAST_FUNC utoa(unsigned n)
119 *(utoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
124 /* Convert signed integer to ascii using a static buffer (returned). */
125 char* FAST_FUNC itoa(int n)
127 *(itoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
132 /* Emit a string of hex representation of bytes */
133 char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
136 unsigned char c = *cp++;
137 /* put lowercase hex digits */
138 *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
139 *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
145 /* Convert "[x]x[:][x]x[:][x]x[:][x]x" hex string to binary, no more than COUNT bytes */
146 char* FAST_FUNC hex2bin(char *dst, const char *str, int count)
149 while (*str && count) {
154 else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
155 val = (c|0x20) - ('a' - 10);
162 else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
163 val |= (c|0x20) - ('a' - 10);
164 else if (c == ':' || c == '\0')
176 errno = (*str ? ERANGE : 0);
180 /* Return how long the file at fd is, if there's any way to determine it. */
182 off_t FAST_FUNC fdlength(int fd)
184 off_t bottom = 0, top = 0, pos;
187 // If the ioctl works for this, return it.
189 if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
191 // FIXME: explain why lseek(SEEK_END) is not used here!
193 // If not, do a binary search for the last location we can read. (Some
194 // block devices don't do BLKGETSIZE right.)
199 pos = bottom + (top - bottom) / 2;
201 // If we can read from the current location, it's bigger.
203 if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
204 if (bottom == top) bottom = top = (top+1) * 2;
207 // If we can't, it's smaller.
216 } while (bottom + 1 != top);
222 int FAST_FUNC bb_putchar_stderr(char ch)
224 return write(STDERR_FILENO, &ch, 1);
227 ssize_t FAST_FUNC full_write1_str(const char *str)
229 return full_write(STDOUT_FILENO, str, strlen(str));
232 ssize_t FAST_FUNC full_write2_str(const char *str)
234 return full_write(STDERR_FILENO, str, strlen(str));
237 static int wh_helper(int value, int def_val, const char *env_name, int *err)
240 char *s = getenv(env_name);
243 /* If LINES/COLUMNS are set, pretend that there is
244 * no error getting w/h, this prevents some ugly
245 * cursor tricks by our callers */
249 if (value <= 1 || value >= 30000)
254 /* It is perfectly ok to pass in a NULL for either width or for
255 * height, in which case that value will not be set. */
256 int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
263 /* I've seen ioctl returning 0, but row/col is (still?) 0.
264 * We treat that as an error too. */
265 err = ioctl(fd, TIOCGWINSZ, &win) != 0 || win.ws_row == 0;
267 *height = wh_helper(win.ws_row, 24, "LINES", &err);
269 *width = wh_helper(win.ws_col, 80, "COLUMNS", &err);
273 int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
275 return tcsetattr(STDIN_FILENO, TCSANOW, tp);
278 pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
283 r = waitpid(pid, wstat, options);
284 while ((r == -1) && (errno == EINTR));
288 pid_t FAST_FUNC wait_any_nohang(int *wstat)
290 return safe_waitpid(-1, wstat, WNOHANG);
293 // Wait for the specified child PID to exit, returning child's error return.
294 int FAST_FUNC wait4pid(pid_t pid)
299 /*errno = ECHILD; -- wrong. */
300 /* we expect errno to be already set from failed [v]fork/exec */
303 if (safe_waitpid(pid, &status, 0) == -1)
305 if (WIFEXITED(status))
306 return WEXITSTATUS(status);
307 if (WIFSIGNALED(status))
308 return WTERMSIG(status) + 0x180;