*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
-
/* We need to have separate xfuncs.c and xfuncs_printf.c because
* with current linkers, even with section garbage collection,
* if *.o module references any of XXXprintf functions, you pull in
*
* TODO: move xmalloc() and xatonum() here.
*/
-
#include "libbb.h"
/* Turn on nonblocking I/O on a fd */
* A truncated result contains the first few digits of the result ala strncpy.
* Returns a pointer past last generated digit, does _not_ store NUL.
*/
-void BUG_sizeof(void);
char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
{
unsigned i, out, res;
if (buflen) {
out = 0;
+
+ BUILD_BUG_ON(sizeof(n) != 4 && sizeof(n) != 8);
if (sizeof(n) == 4)
// 2^32-1 = 4294967295
i = 1000000000;
-#if UINT_MAX > 4294967295 /* prevents warning about "const too large" */
+#if UINT_MAX > 0xffffffff /* prevents warning about "const too large" */
else
if (sizeof(n) == 8)
// 2^64-1 = 18446744073709551615
i = 10000000000000000000;
#endif
- else
- BUG_sizeof();
for (; i; i /= 10) {
res = n / i;
n = n % i;
else bottom = pos;
// If we can't, it's smaller.
-
} else {
if (bottom == top) {
if (!top) return 0;
static int wh_helper(int value, int def_val, const char *env_name, int *err)
{
- if (value == 0) {
- char *s = getenv(env_name);
- if (s) {
- value = atoi(s);
- /* If LINES/COLUMNS are set, pretend that there is
- * no error getting w/h, this prevents some ugly
- * cursor tricks by our callers */
- *err = 0;
- }
+ /* Envvars override even if "value" from ioctl is valid (>0).
+ * Rationale: it's impossible to guess what user wants.
+ * For example: "man CMD | ...": should "man" format output
+ * to stdout's width? stdin's width? /dev/tty's width? 80 chars?
+ * We _cant_ know it. If "..." saves text for e.g. email,
+ * then it's probably 80 chars.
+ * If "..." is, say, "grep -v DISCARD | $PAGER", then user
+ * would prefer his tty's width to be used!
+ *
+ * Since we don't know, at least allow user to do this:
+ * "COLUMNS=80 man CMD | ..."
+ */
+ char *s = getenv(env_name);
+ if (s) {
+ value = atoi(s);
+ /* If LINES/COLUMNS are set, pretend that there is
+ * no error getting w/h, this prevents some ugly
+ * cursor tricks by our callers */
+ *err = 0;
}
+
if (value <= 1 || value >= 30000)
value = def_val;
return value;
{
struct winsize win;
int err;
+ int close_me = -1;
+
+ if (fd == -1) {
+ if (isatty(STDOUT_FILENO))
+ fd = STDOUT_FILENO;
+ else
+ if (isatty(STDERR_FILENO))
+ fd = STDERR_FILENO;
+ else
+ if (isatty(STDIN_FILENO))
+ fd = STDIN_FILENO;
+ else
+ close_me = fd = open("/dev/tty", O_RDONLY);
+ }
win.ws_row = 0;
win.ws_col = 0;
*height = wh_helper(win.ws_row, 24, "LINES", &err);
if (width)
*width = wh_helper(win.ws_col, 80, "COLUMNS", &err);
+
+ if (close_me >= 0)
+ close(close_me);
+
return err;
}
+int FAST_FUNC get_terminal_width(int fd)
+{
+ unsigned width;
+ get_terminal_width_height(fd, &width, NULL);
+ return width;
+}
int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
{
return tcsetattr(STDIN_FILENO, TCSANOW, tp);
}
+int FAST_FUNC get_termios_and_make_raw(int fd, struct termios *newterm, struct termios *oldterm, int flags)
+{
+//TODO: slattach, shell read might be adapted to use this too: grep for "tcsetattr", "[VTIME] = 0"
+ int r;
+
+ memset(oldterm, 0, sizeof(*oldterm)); /* paranoia */
+ r = tcgetattr(fd, oldterm);
+ *newterm = *oldterm;
+
+ /* Turn off buffered input (ICANON)
+ * Turn off echoing (ECHO)
+ * and separate echoing of newline (ECHONL, normally off anyway)
+ */
+ newterm->c_lflag &= ~(ICANON | ECHO | ECHONL);
+ if (flags & TERMIOS_CLEAR_ISIG) {
+ /* dont recognize INT/QUIT/SUSP chars */
+ newterm->c_lflag &= ~ISIG;
+ }
+ /* reads will block only if < 1 char is available */
+ newterm->c_cc[VMIN] = 1;
+ /* no timeout (reads block forever) */
+ newterm->c_cc[VTIME] = 0;
+/* IXON, IXOFF, and IXANY:
+ * IXOFF=1: sw flow control is enabled on input queue:
+ * tty transmits a STOP char when input queue is close to full
+ * and transmits a START char when input queue is nearly empty.
+ * IXON=1: sw flow control is enabled on output queue:
+ * tty will stop sending if STOP char is received,
+ * and resume sending if START is received, or if any char
+ * is received and IXANY=1.
+ */
+ if (flags & TERMIOS_RAW_CRNL_INPUT) {
+ /* IXON=0: XON/XOFF chars are treated as normal chars (why we do this?) */
+ /* dont convert CR to NL on input */
+ newterm->c_iflag &= ~(IXON | ICRNL);
+ }
+ if (flags & TERMIOS_RAW_CRNL_OUTPUT) {
+ /* dont convert NL to CR+NL on output */
+ newterm->c_oflag &= ~(ONLCR);
+ /* Maybe clear more c_oflag bits? Usually, only OPOST and ONLCR are set.
+ * OPOST Enable output processing (reqd for OLCUC and *NL* bits to work)
+ * OLCUC Map lowercase characters to uppercase on output.
+ * OCRNL Map CR to NL on output.
+ * ONOCR Don't output CR at column 0.
+ * ONLRET Don't output CR.
+ */
+ }
+ if (flags & TERMIOS_RAW_INPUT) {
+#ifndef IMAXBEL
+# define IMAXBEL 0
+#endif
+#ifndef IUCLC
+# define IUCLC 0
+#endif
+#ifndef IXANY
+# define IXANY 0
+#endif
+ /* IXOFF=0: disable sending XON/XOFF if input buf is full
+ * IXON=0: input XON/XOFF chars are not special
+ * BRKINT=0: dont send SIGINT on break
+ * IMAXBEL=0: dont echo BEL on input line too long
+ * INLCR,ICRNL,IUCLC: dont convert anything on input
+ */
+ newterm->c_iflag &= ~(IXOFF|IXON|IXANY|BRKINT|INLCR|ICRNL|IUCLC|IMAXBEL);
+ }
+ return r;
+}
+
+int FAST_FUNC set_termios_to_raw(int fd, struct termios *oldterm, int flags)
+{
+ struct termios newterm;
+
+ get_termios_and_make_raw(fd, &newterm, oldterm, flags);
+ return tcsetattr(fd, TCSANOW, &newterm);
+}
+
pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
{
pid_t r;
return WTERMSIG(status) + 0x180;
return 0;
}
+
+// Useful when we do know that pid is valid, and we just want to wait
+// for it to exit. Not existing pid is fatal. waitpid() status is not returned.
+int FAST_FUNC wait_for_exitstatus(pid_t pid)
+{
+ int exit_status, n;
+
+ n = safe_waitpid(pid, &exit_status, 0);
+ if (n < 0)
+ bb_simple_perror_msg_and_die("waitpid");
+ return exit_status;
+}
projects / oweals / busybox.git / blobdiff