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.
55 void BUG_sizeof_unsigned_not_4(void);
56 char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
59 if (sizeof(unsigned) != 4)
60 BUG_sizeof_unsigned_not_4();
63 for (i = 1000000000; i; i /= 10) {
65 if (res || out || i == 1) {
76 /* Convert signed integer to ascii, like utoa_to_buf() */
77 char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
79 if (buflen && n < 0) {
84 return utoa_to_buf((unsigned)n, buf, buflen);
87 // The following two functions use a static buffer, so calling either one a
88 // second time will overwrite previous results.
90 // The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
91 // It so happens that sizeof(int) * 3 is enough for 32+ bits.
92 // (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
94 static char local_buf[sizeof(int) * 3];
96 // Convert unsigned integer to ascii using a static buffer (returned).
97 char* FAST_FUNC utoa(unsigned n)
99 *(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
104 /* Convert signed integer to ascii using a static buffer (returned). */
105 char* FAST_FUNC itoa(int n)
107 *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
112 /* Emit a string of hex representation of bytes */
113 char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
116 unsigned char c = *cp++;
117 /* put lowercase hex digits */
118 *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
119 *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
125 /* Convert "[x]x[:][x]x[:][x]x[:][x]x" hex string to binary, no more than COUNT bytes */
126 char* FAST_FUNC hex2bin(char *dst, const char *str, int count)
129 while (*str && count) {
134 else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
135 val = (c|0x20) - ('a' - 10);
142 else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
143 val |= (c|0x20) - ('a' - 10);
144 else if (c == ':' || c == '\0')
156 errno = (*str ? ERANGE : 0);
160 /* Return how long the file at fd is, if there's any way to determine it. */
162 off_t FAST_FUNC fdlength(int fd)
164 off_t bottom = 0, top = 0, pos;
167 // If the ioctl works for this, return it.
169 if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
171 // FIXME: explain why lseek(SEEK_END) is not used here!
173 // If not, do a binary search for the last location we can read. (Some
174 // block devices don't do BLKGETSIZE right.)
179 pos = bottom + (top - bottom) / 2;
181 // If we can read from the current location, it's bigger.
183 if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
184 if (bottom == top) bottom = top = (top+1) * 2;
187 // If we can't, it's smaller.
196 } while (bottom + 1 != top);
202 int FAST_FUNC bb_putchar_stderr(char ch)
204 return write(STDERR_FILENO, &ch, 1);
207 static int wh_helper(int value, int def_val, const char *env_name, int *err)
210 char *s = getenv(env_name);
213 /* If LINES/COLUMNS are set, pretent that there is
214 * no error getting w/h, this prevents some ugly
215 * cursor tricks by our callers */
219 if (value <= 1 || value >= 30000)
224 /* It is perfectly ok to pass in a NULL for either width or for
225 * height, in which case that value will not be set. */
226 int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
233 /* I've seen ioctl returning 0, but row/col is (still?) 0.
234 * We treat that as an error too. */
235 err = ioctl(fd, TIOCGWINSZ, &win) != 0 || win.ws_row == 0;
237 *height = wh_helper(win.ws_row, 24, "LINES", &err);
239 *width = wh_helper(win.ws_col, 80, "COLUMNS", &err);
243 int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
245 return tcsetattr(STDIN_FILENO, TCSANOW, tp);