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 GPL version 2, see file LICENSE in this tarball for details.
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 int FAST_FUNC ndelay_on(int fd)
30 return fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
33 int FAST_FUNC ndelay_off(int fd)
35 return fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NONBLOCK);
38 int FAST_FUNC close_on_exec_on(int fd)
40 return fcntl(fd, F_SETFD, FD_CLOEXEC);
43 char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
46 enum { IFNAMSIZ = 16 };
48 return strncpy(dst, src, IFNAMSIZ);
52 /* Convert unsigned integer to ascii, writing into supplied buffer.
53 * A truncated result contains the first few digits of the result ala strncpy.
54 * Returns a pointer past last generated digit, does _not_ store NUL.
56 void BUG_sizeof(void);
57 char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
64 // 2^32-1 = 4294967295
66 #if UINT_MAX > 4294967295 /* prevents warning about "const too large" */
69 // 2^64-1 = 18446744073709551615
70 i = 10000000000000000000;
77 if (res || out || i == 1) {
88 /* Convert signed integer to ascii, like utoa_to_buf() */
89 char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
98 return utoa_to_buf((unsigned)n, buf, buflen);
101 // The following two functions use a static buffer, so calling either one a
102 // second time will overwrite previous results.
104 // The largest 32 bit integer is -2 billion plus NUL, or 1+10+1=12 bytes.
105 // It so happens that sizeof(int) * 3 is enough for 32+ bit ints.
106 // (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
108 static char local_buf[sizeof(int) * 3];
110 /* Convert unsigned integer to ascii using a static buffer (returned). */
111 char* FAST_FUNC utoa(unsigned n)
113 *(utoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
118 /* Convert signed integer to ascii using a static buffer (returned). */
119 char* FAST_FUNC itoa(int n)
121 *(itoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
126 /* Emit a string of hex representation of bytes */
127 char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
130 unsigned char c = *cp++;
131 /* put lowercase hex digits */
132 *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
133 *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
139 /* Convert "[x]x[:][x]x[:][x]x[:][x]x" hex string to binary, no more than COUNT bytes */
140 char* FAST_FUNC hex2bin(char *dst, const char *str, int count)
143 while (*str && count) {
148 else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
149 val = (c|0x20) - ('a' - 10);
156 else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
157 val |= (c|0x20) - ('a' - 10);
158 else if (c == ':' || c == '\0')
170 errno = (*str ? ERANGE : 0);
174 /* Return how long the file at fd is, if there's any way to determine it. */
176 off_t FAST_FUNC fdlength(int fd)
178 off_t bottom = 0, top = 0, pos;
181 // If the ioctl works for this, return it.
183 if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
185 // FIXME: explain why lseek(SEEK_END) is not used here!
187 // If not, do a binary search for the last location we can read. (Some
188 // block devices don't do BLKGETSIZE right.)
193 pos = bottom + (top - bottom) / 2;
195 // If we can read from the current location, it's bigger.
197 if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
198 if (bottom == top) bottom = top = (top+1) * 2;
201 // If we can't, it's smaller.
210 } while (bottom + 1 != top);
216 int FAST_FUNC bb_putchar_stderr(char ch)
218 return write(STDERR_FILENO, &ch, 1);
221 ssize_t FAST_FUNC full_write1_str(const char *str)
223 return full_write(STDOUT_FILENO, str, strlen(str));
226 ssize_t FAST_FUNC full_write2_str(const char *str)
228 return full_write(STDERR_FILENO, str, strlen(str));
231 static int wh_helper(int value, int def_val, const char *env_name, int *err)
234 char *s = getenv(env_name);
237 /* If LINES/COLUMNS are set, pretent that there is
238 * no error getting w/h, this prevents some ugly
239 * cursor tricks by our callers */
243 if (value <= 1 || value >= 30000)
248 /* It is perfectly ok to pass in a NULL for either width or for
249 * height, in which case that value will not be set. */
250 int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
257 /* I've seen ioctl returning 0, but row/col is (still?) 0.
258 * We treat that as an error too. */
259 err = ioctl(fd, TIOCGWINSZ, &win) != 0 || win.ws_row == 0;
261 *height = wh_helper(win.ws_row, 24, "LINES", &err);
263 *width = wh_helper(win.ws_col, 80, "COLUMNS", &err);
267 int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
269 return tcsetattr(STDIN_FILENO, TCSANOW, tp);