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 /* Convert unsigned long long value into compact 4-char
44 * representation. Examples: "1234", "1.2k", " 27M", "123T"
45 * String is not terminated (buf[4] is untouched) */
46 void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
50 unsigned v, u, idx = 0;
52 if (ul > 9999) { // do not scale if 9999 or less
57 } while (ul >= 10000);
59 v = ul; // ullong divisions are expensive, avoid them
65 // 9999 or less: use "1234" format
66 // u is value/10, v is last digit
67 c = buf[0] = " 123456789"[u/100];
68 if (c != ' ') fmt = "0123456789";
69 c = buf[1] = fmt[u/10%10];
70 if (c != ' ') fmt = "0123456789";
72 buf[3] = "0123456789"[v];
74 // u is value, v is 1/10ths (allows for 9.2M format)
76 // value is >= 10: use "123M', " 12M" formats
77 c = buf[0] = " 123456789"[u/100];
78 if (c != ' ') fmt = "0123456789";
83 // value is < 10: use "9.2M" format
84 buf[0] = "0123456789"[u];
87 buf[2] = "0123456789"[v];
88 buf[3] = scale[idx]; /* typically scale = " kmgt..." */
92 /* Convert unsigned long long value into compact 5-char representation.
93 * String is not terminated (buf[5] is untouched) */
94 void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
98 unsigned v, u, idx = 0;
100 if (ul > 99999) { // do not scale if 99999 or less
105 } while (ul >= 100000);
107 v = ul; // ullong divisions are expensive, avoid them
113 // 99999 or less: use "12345" format
114 // u is value/10, v is last digit
115 c = buf[0] = " 123456789"[u/1000];
116 if (c != ' ') fmt = "0123456789";
117 c = buf[1] = fmt[u/100%10];
118 if (c != ' ') fmt = "0123456789";
119 c = buf[2] = fmt[u/10%10];
120 if (c != ' ') fmt = "0123456789";
122 buf[4] = "0123456789"[v];
124 // value has been scaled into 0..9999.9 range
125 // u is value, v is 1/10ths (allows for 92.1M format)
127 // value is >= 100: use "1234M', " 123M" formats
128 c = buf[0] = " 123456789"[u/1000];
129 if (c != ' ') fmt = "0123456789";
130 c = buf[1] = fmt[u/100%10];
131 if (c != ' ') fmt = "0123456789";
136 // value is < 100: use "92.1M" format
137 c = buf[0] = " 123456789"[u/10];
138 if (c != ' ') fmt = "0123456789";
142 buf[3] = "0123456789"[v];
143 buf[4] = scale[idx]; /* typically scale = " kmgt..." */
148 // Convert unsigned integer to ascii, writing into supplied buffer.
149 // A truncated result contains the first few digits of the result ala strncpy.
150 // Returns a pointer past last generated digit, does _not_ store NUL.
151 void BUG_sizeof_unsigned_not_4(void);
152 char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
154 unsigned i, out, res;
155 if (sizeof(unsigned) != 4)
156 BUG_sizeof_unsigned_not_4();
159 for (i = 1000000000; i; i /= 10) {
161 if (res || out || i == 1) {
162 if (!--buflen) break;
172 /* Convert signed integer to ascii, like utoa_to_buf() */
173 char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
175 if (buflen && n < 0) {
180 return utoa_to_buf((unsigned)n, buf, buflen);
183 // The following two functions use a static buffer, so calling either one a
184 // second time will overwrite previous results.
186 // The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
187 // It so happens that sizeof(int) * 3 is enough for 32+ bits.
188 // (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
190 static char local_buf[sizeof(int) * 3];
192 // Convert unsigned integer to ascii using a static buffer (returned).
193 char* FAST_FUNC utoa(unsigned n)
195 *(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
200 /* Convert signed integer to ascii using a static buffer (returned). */
201 char* FAST_FUNC itoa(int n)
203 *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
208 /* Emit a string of hex representation of bytes */
209 char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
212 unsigned char c = *cp++;
213 /* put lowercase hex digits */
214 *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
215 *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
221 /* Return how long the file at fd is, if there's any way to determine it. */
223 off_t FAST_FUNC fdlength(int fd)
225 off_t bottom = 0, top = 0, pos;
228 // If the ioctl works for this, return it.
230 if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
232 // FIXME: explain why lseek(SEEK_END) is not used here!
234 // If not, do a binary search for the last location we can read. (Some
235 // block devices don't do BLKGETSIZE right.)
240 pos = bottom + (top - bottom) / 2;
242 // If we can read from the current location, it's bigger.
244 if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
245 if (bottom == top) bottom = top = (top+1) * 2;
248 // If we can't, it's smaller.
257 } while (bottom + 1 != top);
263 /* It is perfectly ok to pass in a NULL for either width or for
264 * height, in which case that value will not be set. */
265 int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
267 struct winsize win = { 0, 0, 0, 0 };
268 int ret = ioctl(fd, TIOCGWINSZ, &win);
272 char *s = getenv("LINES");
273 if (s) win.ws_row = atoi(s);
275 if (win.ws_row <= 1 || win.ws_row >= 30000)
277 *height = (int) win.ws_row;
282 char *s = getenv("COLUMNS");
283 if (s) win.ws_col = atoi(s);
285 if (win.ws_col <= 1 || win.ws_col >= 30000)
287 *width = (int) win.ws_col;
293 int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
295 return tcsetattr(STDIN_FILENO, TCSANOW, tp);