* 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
#include "libbb.h"
/* Turn on nonblocking I/O on a fd */
-int ndelay_on(int fd)
+void 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;
+ fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
-int ndelay_off(int fd)
+void 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;
+ fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
}
-int 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);
}
-/* Convert unsigned long long value into compact 4-char
- * representation. Examples: "1234", "1.2k", " 27M", "123T"
- * String is not terminated (buf[4] is untouched) */
-void smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
+char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
{
- const char *fmt;
- char c;
- unsigned v, u, idx = 0;
-
- if (ul > 9999) { // do not scale if 9999 or less
- ul *= 10;
- do {
- ul /= 1024;
- idx++;
- } while (ul >= 10000);
- }
- v = ul; // ullong divisions are expensive, avoid them
-
- fmt = " 123456789";
- u = v / 10;
- v = v % 10;
- if (!idx) {
- // 9999 or less: use "1234" format
- // u is value/10, v is last digit
- c = buf[0] = " 123456789"[u/100];
- if (c != ' ') fmt = "0123456789";
- c = buf[1] = fmt[u/10%10];
- if (c != ' ') fmt = "0123456789";
- buf[2] = fmt[u%10];
- buf[3] = "0123456789"[v];
- } else {
- // u is value, v is 1/10ths (allows for 9.2M format)
- if (u >= 10) {
- // value is >= 10: use "123M', " 12M" formats
- c = buf[0] = " 123456789"[u/100];
- if (c != ' ') fmt = "0123456789";
- v = u % 10;
- u = u / 10;
- buf[1] = fmt[u%10];
- } else {
- // value is < 10: use "9.2M" format
- buf[0] = "0123456789"[u];
- buf[1] = '.';
- }
- buf[2] = "0123456789"[v];
- buf[3] = scale[idx]; /* typically scale = " kmgt..." */
- }
-}
-
-/* Convert unsigned long long value into compact 5-char representation.
- * String is not terminated (buf[5] is untouched) */
-void smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
-{
- const char *fmt;
- char c;
- unsigned v, u, idx = 0;
-
- if (ul > 99999) { // do not scale if 99999 or less
- ul *= 10;
- do {
- ul /= 1024;
- idx++;
- } while (ul >= 100000);
- }
- v = ul; // ullong divisions are expensive, avoid them
-
- fmt = " 123456789";
- u = v / 10;
- v = v % 10;
- if (!idx) {
- // 99999 or less: use "12345" format
- // u is value/10, v is last digit
- c = buf[0] = " 123456789"[u/1000];
- if (c != ' ') fmt = "0123456789";
- c = buf[1] = fmt[u/100%10];
- if (c != ' ') fmt = "0123456789";
- c = buf[2] = fmt[u/10%10];
- if (c != ' ') fmt = "0123456789";
- buf[3] = fmt[u%10];
- buf[4] = "0123456789"[v];
- } else {
- // value has been scaled into 0..9999.9 range
- // u is value, v is 1/10ths (allows for 92.1M format)
- if (u >= 100) {
- // value is >= 100: use "1234M', " 123M" formats
- c = buf[0] = " 123456789"[u/1000];
- if (c != ' ') fmt = "0123456789";
- c = buf[1] = fmt[u/100%10];
- if (c != ' ') fmt = "0123456789";
- v = u % 10;
- u = u / 10;
- buf[2] = fmt[u%10];
- } else {
- // value is < 100: use "92.1M" format
- c = buf[0] = " 123456789"[u/10];
- if (c != ' ') fmt = "0123456789";
- buf[1] = fmt[u%10];
- buf[2] = '.';
- }
- buf[3] = "0123456789"[v];
- buf[4] = scale[idx]; /* typically scale = " kmgt..." */
- }
+#ifndef IFNAMSIZ
+ enum { IFNAMSIZ = 16 };
+#endif
+ return strncpy(dst, src, IFNAMSIZ);
}
-// 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);
-char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
+/* 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(void);
+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) {
+ if (sizeof(n) == 4)
+ // 2^32-1 = 4294967295
+ i = 1000000000;
+#if UINT_MAX > 4294967295 /* 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;
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 *itoa_to_buf(int n, char *buf, unsigned buflen)
+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).
-char *utoa(unsigned n)
+/* 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 *itoa(int n)
+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;
}
/* Emit a string of hex representation of bytes */
-char *bin2hex(char *p, const char *cp, int count)
+char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
{
while (count) {
unsigned char c = *cp++;
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 fdlength(int fd)
+off_t FAST_FUNC fdlength(int fd)
{
off_t bottom = 0, top = 0, pos;
long size;
}
#endif
-/* 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 get_terminal_width_height(int fd, unsigned *width, unsigned *height)
+int FAST_FUNC bb_putchar_stderr(char ch)
{
- struct winsize win = { 0, 0, 0, 0 };
- int ret = ioctl(fd, TIOCGWINSZ, &win);
+ return write(STDERR_FILENO, &ch, 1);
+}
- 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;
- }
+ssize_t FAST_FUNC full_write1_str(const char *str)
+{
+ return full_write(STDOUT_FILENO, str, strlen(str));
+}
- if (width) {
- if (!win.ws_col) {
- char *s = getenv("COLUMNS");
- if (s) win.ws_col = atoi(s);
+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)
+{
+ 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;
}
- if (win.ws_col <= 1 || win.ws_col >= 30000)
- win.ws_col = 80;
- *width = (int) win.ws_col;
}
+ if (value <= 1 || value >= 30000)
+ value = def_val;
+ return value;
+}
- return ret;
+/* 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;
+ int err;
+
+ 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);
+ return err;
+}
+
+int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
+{
+ return tcsetattr(STDIN_FILENO, TCSANOW, tp);
+}
+
+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;
}
projects / oweals / busybox.git / blobdiff