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text data bss dec hex filename 808035 611 6868 815514 c719a busybox_old 804472 611 6868 811951 c63af busybox_unstripped
292 lines
7.2 KiB
C
292 lines
7.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* Copyright (C) 2006 Rob Landley
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* Copyright (C) 2006 Denys Vlasenko
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*
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* Licensed under GPL version 2, see file LICENSE in this tarball for details.
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*/
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/* We need to have separate xfuncs.c and xfuncs_printf.c because
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* with current linkers, even with section garbage collection,
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* if *.o module references any of XXXprintf functions, you pull in
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* entire printf machinery. Even if you do not use the function
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* which uses XXXprintf.
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*
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* xfuncs.c contains functions (not necessarily xfuncs)
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* which do not pull in printf, directly or indirectly.
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* xfunc_printf.c contains those which do.
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*
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* TODO: move xmalloc() and xatonum() here.
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*/
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#include "libbb.h"
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/* Turn on nonblocking I/O on a fd */
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int FAST_FUNC ndelay_on(int fd)
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{
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return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK);
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}
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int FAST_FUNC ndelay_off(int fd)
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{
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return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK);
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}
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int FAST_FUNC close_on_exec_on(int fd)
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{
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return fcntl(fd, F_SETFD, FD_CLOEXEC);
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}
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/* Convert unsigned long long value into compact 4-char
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* representation. Examples: "1234", "1.2k", " 27M", "123T"
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* String is not terminated (buf[4] is untouched) */
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void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
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{
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const char *fmt;
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char c;
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unsigned v, u, idx = 0;
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if (ul > 9999) { // do not scale if 9999 or less
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ul *= 10;
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do {
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ul /= 1024;
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idx++;
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} while (ul >= 10000);
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}
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v = ul; // ullong divisions are expensive, avoid them
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fmt = " 123456789";
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u = v / 10;
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v = v % 10;
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if (!idx) {
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// 9999 or less: use "1234" format
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// u is value/10, v is last digit
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c = buf[0] = " 123456789"[u/100];
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if (c != ' ') fmt = "0123456789";
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c = buf[1] = fmt[u/10%10];
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if (c != ' ') fmt = "0123456789";
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buf[2] = fmt[u%10];
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buf[3] = "0123456789"[v];
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} else {
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// u is value, v is 1/10ths (allows for 9.2M format)
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if (u >= 10) {
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// value is >= 10: use "123M', " 12M" formats
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c = buf[0] = " 123456789"[u/100];
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if (c != ' ') fmt = "0123456789";
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v = u % 10;
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u = u / 10;
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buf[1] = fmt[u%10];
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} else {
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// value is < 10: use "9.2M" format
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buf[0] = "0123456789"[u];
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buf[1] = '.';
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}
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buf[2] = "0123456789"[v];
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buf[3] = scale[idx]; /* typically scale = " kmgt..." */
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}
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}
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/* Convert unsigned long long value into compact 5-char representation.
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* String is not terminated (buf[5] is untouched) */
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void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
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{
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const char *fmt;
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char c;
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unsigned v, u, idx = 0;
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if (ul > 99999) { // do not scale if 99999 or less
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ul *= 10;
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do {
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ul /= 1024;
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idx++;
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} while (ul >= 100000);
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}
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v = ul; // ullong divisions are expensive, avoid them
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fmt = " 123456789";
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u = v / 10;
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v = v % 10;
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if (!idx) {
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// 99999 or less: use "12345" format
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// u is value/10, v is last digit
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c = buf[0] = " 123456789"[u/1000];
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if (c != ' ') fmt = "0123456789";
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c = buf[1] = fmt[u/100%10];
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if (c != ' ') fmt = "0123456789";
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c = buf[2] = fmt[u/10%10];
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if (c != ' ') fmt = "0123456789";
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buf[3] = fmt[u%10];
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buf[4] = "0123456789"[v];
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} else {
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// value has been scaled into 0..9999.9 range
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// u is value, v is 1/10ths (allows for 92.1M format)
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if (u >= 100) {
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// value is >= 100: use "1234M', " 123M" formats
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c = buf[0] = " 123456789"[u/1000];
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if (c != ' ') fmt = "0123456789";
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c = buf[1] = fmt[u/100%10];
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if (c != ' ') fmt = "0123456789";
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v = u % 10;
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u = u / 10;
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buf[2] = fmt[u%10];
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} else {
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// value is < 100: use "92.1M" format
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c = buf[0] = " 123456789"[u/10];
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if (c != ' ') fmt = "0123456789";
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buf[1] = fmt[u%10];
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buf[2] = '.';
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}
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buf[3] = "0123456789"[v];
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buf[4] = scale[idx]; /* typically scale = " kmgt..." */
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}
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}
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// Convert unsigned integer to ascii, writing into supplied buffer.
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// A truncated result contains the first few digits of the result ala strncpy.
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// Returns a pointer past last generated digit, does _not_ store NUL.
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void BUG_sizeof_unsigned_not_4(void);
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char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
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{
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unsigned i, out, res;
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if (sizeof(unsigned) != 4)
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BUG_sizeof_unsigned_not_4();
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if (buflen) {
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out = 0;
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for (i = 1000000000; i; i /= 10) {
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res = n / i;
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if (res || out || i == 1) {
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if (!--buflen) break;
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out++;
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n -= res*i;
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*buf++ = '0' + res;
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}
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}
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}
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return buf;
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}
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/* Convert signed integer to ascii, like utoa_to_buf() */
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char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
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{
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if (buflen && n < 0) {
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n = -n;
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*buf++ = '-';
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buflen--;
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}
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return utoa_to_buf((unsigned)n, buf, buflen);
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}
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// The following two functions use a static buffer, so calling either one a
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// second time will overwrite previous results.
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//
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// The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
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// It so happens that sizeof(int) * 3 is enough for 32+ bits.
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// (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
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static char local_buf[sizeof(int) * 3];
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// Convert unsigned integer to ascii using a static buffer (returned).
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char* FAST_FUNC utoa(unsigned n)
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{
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*(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
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return local_buf;
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}
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/* Convert signed integer to ascii using a static buffer (returned). */
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char* FAST_FUNC itoa(int n)
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{
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*(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
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return local_buf;
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}
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/* Emit a string of hex representation of bytes */
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char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
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{
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while (count) {
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unsigned char c = *cp++;
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/* put lowercase hex digits */
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*p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
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*p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
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count--;
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}
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return p;
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}
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/* Return how long the file at fd is, if there's any way to determine it. */
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#ifdef UNUSED
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off_t FAST_FUNC fdlength(int fd)
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{
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off_t bottom = 0, top = 0, pos;
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long size;
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// If the ioctl works for this, return it.
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if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
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// FIXME: explain why lseek(SEEK_END) is not used here!
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// If not, do a binary search for the last location we can read. (Some
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// block devices don't do BLKGETSIZE right.)
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do {
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char temp;
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pos = bottom + (top - bottom) / 2;
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// If we can read from the current location, it's bigger.
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if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
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if (bottom == top) bottom = top = (top+1) * 2;
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else bottom = pos;
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// If we can't, it's smaller.
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} else {
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if (bottom == top) {
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if (!top) return 0;
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bottom = top/2;
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}
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else top = pos;
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}
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} while (bottom + 1 != top);
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return pos + 1;
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}
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#endif
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/* It is perfectly ok to pass in a NULL for either width or for
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* height, in which case that value will not be set. */
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int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
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{
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struct winsize win = { 0, 0, 0, 0 };
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int ret = ioctl(fd, TIOCGWINSZ, &win);
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if (height) {
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if (!win.ws_row) {
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char *s = getenv("LINES");
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if (s) win.ws_row = atoi(s);
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}
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if (win.ws_row <= 1 || win.ws_row >= 30000)
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win.ws_row = 24;
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*height = (int) win.ws_row;
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}
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if (width) {
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if (!win.ws_col) {
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char *s = getenv("COLUMNS");
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if (s) win.ws_col = atoi(s);
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}
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if (win.ws_col <= 1 || win.ws_col >= 30000)
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win.ws_col = 80;
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*width = (int) win.ws_col;
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}
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return ret;
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}
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