* Copyright (C) 2006 Rob Landley
* Copyright (C) 2006 Denys Vlasenko
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * 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 */
int FAST_FUNC ndelay_on(int fd)
{
- return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK);
+ int flags = fcntl(fd, F_GETFL);
+ if (flags & O_NONBLOCK)
+ return flags;
+ fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+ return flags;
}
int FAST_FUNC ndelay_off(int fd)
{
- return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK);
+ int flags = fcntl(fd, F_GETFL);
+ if (!(flags & O_NONBLOCK))
+ return flags;
+ fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
+ return flags;
}
-int FAST_FUNC close_on_exec_on(int fd)
+void FAST_FUNC close_on_exec_on(int fd)
{
- return fcntl(fd, F_SETFD, FD_CLOEXEC);
+ fcntl(fd, F_SETFD, FD_CLOEXEC);
}
char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
}
-// Convert unsigned integer to ascii, writing into supplied buffer.
-// 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_unsigned_not_4(void);
+/* Convert unsigned integer to ascii, writing into supplied buffer.
+ * A truncated result contains the first few digits of the result ala strncpy.
+ * Returns a pointer past last generated digit, does _not_ store NUL.
+ */
char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
{
unsigned i, out, res;
- if (sizeof(unsigned) != 4)
- BUG_sizeof_unsigned_not_4();
+
if (buflen) {
out = 0;
- for (i = 1000000000; i; i /= 10) {
+
+ BUILD_BUG_ON(sizeof(n) != 4 && sizeof(n) != 8);
+ if (sizeof(n) == 4)
+ // 2^32-1 = 4294967295
+ i = 1000000000;
+#if UINT_MAX > 0xffffffff /* prevents warning about "const too large" */
+ else
+ if (sizeof(n) == 8)
+ // 2^64-1 = 18446744073709551615
+ i = 10000000000000000000;
+#endif
+ for (; i; i /= 10) {
res = n / i;
+ n = n % i;
if (res || out || i == 1) {
- if (!--buflen) break;
+ if (--buflen == 0)
+ break;
out++;
- n -= res*i;
*buf++ = '0' + res;
}
}
/* Convert signed integer to ascii, like utoa_to_buf() */
char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
{
- if (buflen && n < 0) {
+ if (!buflen)
+ return buf;
+ if (n < 0) {
n = -n;
*buf++ = '-';
buflen--;
// The following two functions use a static buffer, so calling either one a
// second time will overwrite previous results.
//
-// The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
-// It so happens that sizeof(int) * 3 is enough for 32+ bits.
+// The largest 32 bit integer is -2 billion plus NUL, or 1+10+1=12 bytes.
+// It so happens that sizeof(int) * 3 is enough for 32+ bit ints.
// (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
static char local_buf[sizeof(int) * 3];
-// Convert unsigned integer to ascii using a static buffer (returned).
+/* Convert unsigned integer to ascii using a static buffer (returned). */
char* FAST_FUNC utoa(unsigned n)
{
- *(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
+ *(utoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
return local_buf;
}
/* Convert signed integer to ascii using a static buffer (returned). */
char* FAST_FUNC itoa(int n)
{
- *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
+ *(itoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
return local_buf;
}
return p;
}
+/* Convert "[x]x[:][x]x[:][x]x[:][x]x" hex string to binary, no more than COUNT bytes */
+char* FAST_FUNC hex2bin(char *dst, const char *str, int count)
+{
+ errno = EINVAL;
+ while (*str && count) {
+ uint8_t val;
+ uint8_t c = *str++;
+ if (isdigit(c))
+ val = c - '0';
+ else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
+ val = (c|0x20) - ('a' - 10);
+ else
+ return NULL;
+ val <<= 4;
+ c = *str;
+ if (isdigit(c))
+ val |= c - '0';
+ else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
+ val |= (c|0x20) - ('a' - 10);
+ else if (c == ':' || c == '\0')
+ val >>= 4;
+ else
+ return NULL;
+
+ *dst++ = val;
+ if (c != '\0')
+ str++;
+ if (*str == ':')
+ str++;
+ count--;
+ }
+ errno = (*str ? ERANGE : 0);
+ return dst;
+}
+
/* Return how long the file at fd is, if there's any way to determine it. */
#ifdef UNUSED
off_t FAST_FUNC fdlength(int fd)
else bottom = pos;
// If we can't, it's smaller.
-
} else {
if (bottom == top) {
if (!top) return 0;
}
#endif
-char* FAST_FUNC xmalloc_ttyname(int fd)
+int FAST_FUNC bb_putchar_stderr(char ch)
{
- char *buf = xzalloc(128);
- int r = ttyname_r(fd, buf, 127);
- if (r) {
- free(buf);
- buf = NULL;
+ return write(STDERR_FILENO, &ch, 1);
+}
+
+ssize_t FAST_FUNC full_write1_str(const char *str)
+{
+ return full_write(STDOUT_FILENO, str, strlen(str));
+}
+
+ssize_t FAST_FUNC full_write2_str(const char *str)
+{
+ return full_write(STDERR_FILENO, str, strlen(str));
+}
+
+static int wh_helper(int value, int def_val, const char *env_name, int *err)
+{
+ /* 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;
}
- return buf;
+
+ if (value <= 1 || value >= 30000)
+ value = def_val;
+ return value;
}
/* It is perfectly ok to pass in a NULL for either width or for
* height, in which case that value will not be set. */
int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
{
- struct winsize win = { 0, 0, 0, 0 };
- int ret = ioctl(fd, TIOCGWINSZ, &win);
-
- if (height) {
- if (!win.ws_row) {
- char *s = getenv("LINES");
- if (s) win.ws_row = atoi(s);
- }
- if (win.ws_row <= 1 || win.ws_row >= 30000)
- win.ws_row = 24;
- *height = (int) win.ws_row;
+ 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);
}
- if (width) {
- if (!win.ws_col) {
- char *s = getenv("COLUMNS");
- if (s) win.ws_col = atoi(s);
- }
- if (win.ws_col <= 1 || win.ws_col >= 30000)
- win.ws_col = 80;
- *width = (int) win.ws_col;
- }
+ win.ws_row = 0;
+ win.ws_col = 0;
+ /* I've seen ioctl returning 0, but row/col is (still?) 0.
+ * We treat that as an error too. */
+ err = ioctl(fd, TIOCGWINSZ, &win) != 0 || win.ws_row == 0;
+ if (height)
+ *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 ret;
+ 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;
+
+ do
+ r = waitpid(pid, wstat, options);
+ while ((r == -1) && (errno == EINTR));
+ return r;
+}
+
+pid_t FAST_FUNC wait_any_nohang(int *wstat)
+{
+ return safe_waitpid(-1, wstat, WNOHANG);
+}
+
+// Wait for the specified child PID to exit, returning child's error return.
+int FAST_FUNC wait4pid(pid_t pid)
+{
+ int status;
+
+ if (pid <= 0) {
+ /*errno = ECHILD; -- wrong. */
+ /* we expect errno to be already set from failed [v]fork/exec */
+ return -1;
+ }
+ if (safe_waitpid(pid, &status, 0) == -1)
+ return -1;
+ if (WIFEXITED(status))
+ return WEXITSTATUS(status);
+ if (WIFSIGNALED(status))
+ 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