#include "core.h"
#include "config.h"
-#include "log.h"
-
-/*
- * TIPC pre-defines the following print buffers:
- *
- * TIPC_NULL : null buffer (i.e. print nowhere)
- * TIPC_CONS : system console
- * TIPC_LOG : TIPC log buffer
- *
- * Additional user-defined print buffers are also permitted.
- */
-static struct print_buf null_buf = { NULL, 0, NULL, 0 };
-struct print_buf *const TIPC_NULL = &null_buf;
-
-static struct print_buf cons_buf = { NULL, 0, NULL, 1 };
-struct print_buf *const TIPC_CONS = &cons_buf;
-
-static struct print_buf log_buf = { NULL, 0, NULL, 1 };
-struct print_buf *const TIPC_LOG = &log_buf;
-
-/*
- * Locking policy when using print buffers.
- *
- * 1) tipc_printf() uses 'print_lock' to protect against concurrent access to
- * 'print_string' when writing to a print buffer. This also protects against
- * concurrent writes to the print buffer being written to.
- *
- * 2) tipc_log_XXX() leverages the aforementioned use of 'print_lock' to
- * protect against all types of concurrent operations on their associated
- * print buffer (not just write operations).
- *
- * Note: All routines of the form tipc_printbuf_XXX() are lock-free, and rely
- * on the caller to prevent simultaneous use of the print buffer(s) being
- * manipulated.
- */
-static char print_string[TIPC_PB_MAX_STR];
-static DEFINE_SPINLOCK(print_lock);
-
-static void tipc_printbuf_move(struct print_buf *pb_to,
- struct print_buf *pb_from);
-
-#define FORMAT(PTR, LEN, FMT) \
-{\
- va_list args;\
- va_start(args, FMT);\
- LEN = vsprintf(PTR, FMT, args);\
- va_end(args);\
- *(PTR + LEN) = '\0';\
-}
-
-/**
- * tipc_printbuf_init - initialize print buffer to empty
- * @pb: pointer to print buffer structure
- * @raw: pointer to character array used by print buffer
- * @size: size of character array
- *
- * Note: If the character array is too small (or absent), the print buffer
- * becomes a null device that discards anything written to it.
- */
-void tipc_printbuf_init(struct print_buf *pb, char *raw, u32 size)
-{
- pb->buf = raw;
- pb->crs = raw;
- pb->size = size;
- pb->echo = 0;
-
- if (size < TIPC_PB_MIN_SIZE) {
- pb->buf = NULL;
- } else if (raw) {
- pb->buf[0] = 0;
- pb->buf[size - 1] = ~0;
- }
-}
-
-/**
- * tipc_printbuf_reset - reinitialize print buffer to empty state
- * @pb: pointer to print buffer structure
- */
-static void tipc_printbuf_reset(struct print_buf *pb)
-{
- if (pb->buf) {
- pb->crs = pb->buf;
- pb->buf[0] = 0;
- pb->buf[pb->size - 1] = ~0;
- }
-}
-
-/**
- * tipc_printbuf_empty - test if print buffer is in empty state
- * @pb: pointer to print buffer structure
- *
- * Returns non-zero if print buffer is empty.
- */
-static int tipc_printbuf_empty(struct print_buf *pb)
-{
- return !pb->buf || (pb->crs == pb->buf);
-}
-
-/**
- * tipc_printbuf_validate - check for print buffer overflow
- * @pb: pointer to print buffer structure
- *
- * Verifies that a print buffer has captured all data written to it.
- * If data has been lost, linearize buffer and prepend an error message
- *
- * Returns length of print buffer data string (including trailing NUL)
- */
-int tipc_printbuf_validate(struct print_buf *pb)
-{
- char *err = "\n\n*** PRINT BUFFER OVERFLOW ***\n\n";
- char *cp_buf;
- struct print_buf cb;
-
- if (!pb->buf)
- return 0;
-
- if (pb->buf[pb->size - 1] == 0) {
- cp_buf = kmalloc(pb->size, GFP_ATOMIC);
- if (cp_buf) {
- tipc_printbuf_init(&cb, cp_buf, pb->size);
- tipc_printbuf_move(&cb, pb);
- tipc_printbuf_move(pb, &cb);
- kfree(cp_buf);
- memcpy(pb->buf, err, strlen(err));
- } else {
- tipc_printbuf_reset(pb);
- tipc_printf(pb, err);
- }
- }
- return pb->crs - pb->buf + 1;
-}
-
-/**
- * tipc_printbuf_move - move print buffer contents to another print buffer
- * @pb_to: pointer to destination print buffer structure
- * @pb_from: pointer to source print buffer structure
- *
- * Current contents of destination print buffer (if any) are discarded.
- * Source print buffer becomes empty if a successful move occurs.
- */
-static void tipc_printbuf_move(struct print_buf *pb_to,
- struct print_buf *pb_from)
-{
- int len;
-
- /* Handle the cases where contents can't be moved */
- if (!pb_to->buf)
- return;
-
- if (!pb_from->buf) {
- tipc_printbuf_reset(pb_to);
- return;
- }
-
- if (pb_to->size < pb_from->size) {
- strcpy(pb_to->buf, "*** PRINT BUFFER MOVE ERROR ***");
- pb_to->buf[pb_to->size - 1] = ~0;
- pb_to->crs = strchr(pb_to->buf, 0);
- return;
- }
-
- /* Copy data from char after cursor to end (if used) */
- len = pb_from->buf + pb_from->size - pb_from->crs - 2;
- if ((pb_from->buf[pb_from->size - 1] == 0) && (len > 0)) {
- strcpy(pb_to->buf, pb_from->crs + 1);
- pb_to->crs = pb_to->buf + len;
- } else
- pb_to->crs = pb_to->buf;
-
- /* Copy data from start to cursor (always) */
- len = pb_from->crs - pb_from->buf;
- strcpy(pb_to->crs, pb_from->buf);
- pb_to->crs += len;
-
- tipc_printbuf_reset(pb_from);
-}
/**
- * tipc_printf - append formatted output to print buffer
- * @pb: pointer to print buffer
+ * tipc_snprintf - append formatted output to print buffer
+ * @buf: pointer to print buffer
+ * @len: buffer length
* @fmt: formatted info to be printed
*/
-void tipc_printf(struct print_buf *pb, const char *fmt, ...)
-{
- int chars_to_add;
- int chars_left;
- char save_char;
-
- spin_lock_bh(&print_lock);
-
- FORMAT(print_string, chars_to_add, fmt);
- if (chars_to_add >= TIPC_PB_MAX_STR)
- strcpy(print_string, "*** PRINT BUFFER STRING TOO LONG ***");
-
- if (pb->buf) {
- chars_left = pb->buf + pb->size - pb->crs - 1;
- if (chars_to_add <= chars_left) {
- strcpy(pb->crs, print_string);
- pb->crs += chars_to_add;
- } else if (chars_to_add >= (pb->size - 1)) {
- strcpy(pb->buf, print_string + chars_to_add + 1
- - pb->size);
- pb->crs = pb->buf + pb->size - 1;
- } else {
- strcpy(pb->buf, print_string + chars_left);
- save_char = print_string[chars_left];
- print_string[chars_left] = 0;
- strcpy(pb->crs, print_string);
- print_string[chars_left] = save_char;
- pb->crs = pb->buf + chars_to_add - chars_left;
- }
- }
-
- if (pb->echo)
- printk("%s", print_string);
-
- spin_unlock_bh(&print_lock);
-}
-
-/**
- * tipc_log_resize - change the size of the TIPC log buffer
- * @log_size: print buffer size to use
- */
-int tipc_log_resize(int log_size)
-{
- int res = 0;
-
- spin_lock_bh(&print_lock);
- kfree(TIPC_LOG->buf);
- TIPC_LOG->buf = NULL;
- if (log_size) {
- if (log_size < TIPC_PB_MIN_SIZE)
- log_size = TIPC_PB_MIN_SIZE;
- res = TIPC_LOG->echo;
- tipc_printbuf_init(TIPC_LOG, kmalloc(log_size, GFP_ATOMIC),
- log_size);
- TIPC_LOG->echo = res;
- res = !TIPC_LOG->buf;
- }
- spin_unlock_bh(&print_lock);
-
- return res;
-}
-
-/**
- * tipc_log_resize_cmd - reconfigure size of TIPC log buffer
- */
-struct sk_buff *tipc_log_resize_cmd(const void *req_tlv_area, int req_tlv_space)
-{
- u32 value;
-
- if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
- return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
-
- value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
- if (value > 32768)
- return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
- " (log size must be 0-32768)");
- if (tipc_log_resize(value))
- return tipc_cfg_reply_error_string(
- "unable to create specified log (log size is now 0)");
- return tipc_cfg_reply_none();
-}
-
-/**
- * tipc_log_dump - capture TIPC log buffer contents in configuration message
- */
-struct sk_buff *tipc_log_dump(void)
+int tipc_snprintf(char *buf, int len, const char *fmt, ...)
{
- struct sk_buff *reply;
-
- spin_lock_bh(&print_lock);
- if (!TIPC_LOG->buf) {
- spin_unlock_bh(&print_lock);
- reply = tipc_cfg_reply_ultra_string("log not activated\n");
- } else if (tipc_printbuf_empty(TIPC_LOG)) {
- spin_unlock_bh(&print_lock);
- reply = tipc_cfg_reply_ultra_string("log is empty\n");
- } else {
- struct tlv_desc *rep_tlv;
- struct print_buf pb;
- int str_len;
+ int i;
+ va_list args;
- str_len = min(TIPC_LOG->size, 32768u);
- spin_unlock_bh(&print_lock);
- reply = tipc_cfg_reply_alloc(TLV_SPACE(str_len));
- if (reply) {
- rep_tlv = (struct tlv_desc *)reply->data;
- tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), str_len);
- spin_lock_bh(&print_lock);
- tipc_printbuf_move(&pb, TIPC_LOG);
- spin_unlock_bh(&print_lock);
- str_len = strlen(TLV_DATA(rep_tlv)) + 1;
- skb_put(reply, TLV_SPACE(str_len));
- TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
- }
- }
- return reply;
+ va_start(args, fmt);
+ i = vscnprintf(buf, len, fmt, args);
+ va_end(args);
+ return i;
}
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