int zlog_buf_vprintf(zlog_buf_t * a_buf, const char *format, va_list args)
{
va_list ap;
size_t size_left;
int nwrite;
if (!a_buf->start) {
zc_error("pre-use of zlog_buf_resize fail, so can't convert");
return -1;
}
va_copy(ap, args);
size_left = a_buf->end_plus_1 - a_buf->tail;
nwrite = vsnprintf(a_buf->tail, size_left, format, ap);
if (nwrite >= 0 && nwrite < size_left) {
a_buf->tail += nwrite;
//*(a_buf->tail) = '\0';
return 0;
} else if (nwrite < 0) {
zc_error("vsnprintf fail, errno[%d]", errno);
zc_error("nwrite[%d], size_left[%ld], format[%s]", nwrite, size_left, format);
return -1;
} else if (nwrite >= size_left) {
int rc;
//zc_debug("nwrite[%d]>=size_left[%ld],format[%s],resize", nwrite, size_left, format);
rc = zlog_buf_resize(a_buf, nwrite - size_left + 1);
if (rc > 0) {
zc_error("conf limit to %ld, can't extend, so truncate", a_buf->size_max);
va_copy(ap, args);
size_left = a_buf->end_plus_1 - a_buf->tail;
vsnprintf(a_buf->tail, size_left, format, ap);
a_buf->tail += size_left - 1;
//*(a_buf->tail) = '\0';
zlog_buf_truncate(a_buf);
return 1;
} else if (rc < 0) {
zc_error("zlog_buf_resize fail");
return -1;
} else {
//zc_debug("zlog_buf_resize succ, to[%ld]", a_buf->size_real);
va_copy(ap, args);
size_left = a_buf->end_plus_1 - a_buf->tail;
nwrite = vsnprintf(a_buf->tail, size_left, format, ap);
if (nwrite < 0) {
zc_error("vsnprintf fail, errno[%d]", errno);
zc_error("nwrite[%d], size_left[%ld], format[%s]", nwrite, size_left, format);
return -1;
} else {
a_buf->tail += nwrite;
//*(a_buf->tail) = '\0';
return 0;
}
}
}
return 0;
}
int zlog_buf_printf_dec64(zlog_buf_t * a_buf, uint64_t ui64, int width)
{
unsigned char *p;
char *q;
unsigned char tmp[ZLOG_INT64_LEN + 1];
size_t num_len, zero_len, out_len;
uint32_t ui32;
if (a_buf->size_real < 0) {
zc_error("pre-use of zlog_buf_resize fail, so can't convert");
return -1;
}
p = tmp + ZLOG_INT64_LEN;
if (ui64 <= ZLOG_MAX_UINT32_VALUE) {
/*
* To divide 64-bit numbers and to find remainders
* on the x86 platform gcc and icc call the libc functions
* [u]divdi3() and [u]moddi3(), they call another function
* in its turn. On FreeBSD it is the qdivrem() function,
* its source code is about 170 lines of the code.
* The glibc counterpart is about 150 lines of the code.
*
* For 32-bit numbers and some divisors gcc and icc use
* a inlined multiplication and shifts. For example,
* unsigned "i32 / 10" is compiled to
*
* (i32 * 0xCCCCCCCD) >> 35
*/
ui32 = (uint32_t) ui64;
do {
*--p = (unsigned char) (ui32 % 10 + '0');
} while (ui32 /= 10);
} else {
do {
*--p = (unsigned char) (ui64 % 10 + '0');
} while (ui64 /= 10);
}
/* zero or space padding */
num_len = (tmp + ZLOG_INT64_LEN) - p;
if (width > num_len) {
zero_len = width - num_len;
out_len = width;
} else {
zero_len = 0;
out_len = num_len;
}
if ((q = a_buf->tail + out_len) > a_buf->end) {
int rc;
//zc_debug("size_left not enough, resize");
rc = zlog_buf_resize(a_buf, out_len - (a_buf->end - a_buf->tail));
if (rc > 0) {
size_t len_left;
zc_error("conf limit to %ld, can't extend, so output", a_buf->size_max);
len_left = a_buf->end - a_buf->tail;
if (len_left <= zero_len) {
zero_len = len_left;
num_len = 0;
} else if (len_left > zero_len) {
/* zero_len not changed */
num_len = len_left - zero_len;
}
memset(a_buf->tail, '0', zero_len);
memcpy(a_buf->tail + zero_len, p, num_len);
a_buf->tail += len_left;
//*(a_buf->tail) = '\0';
zlog_buf_truncate(a_buf);
return 1;
} else if (rc < 0) {
zc_error("zlog_buf_resize fail");
return -1;
} else {
//zc_debug("zlog_buf_resize succ, to[%ld]", a_buf->size_real);
q = a_buf->tail + out_len; /* re-calculate p*/
}
}
memset(a_buf->tail, '0', zero_len);
memcpy(a_buf->tail + zero_len, p, num_len);
a_buf->tail = q;
//*(a_buf->tail) = '\0';
return 0;
}
/* if width > num_len, 0 padding, else output num */
int zlog_buf_printf_dec32(zlog_buf_t * a_buf, uint32_t ui32, int width)
{
unsigned char *p;
char *q;
unsigned char tmp[ZLOG_INT32_LEN + 1];
size_t num_len, zero_len, out_len;
if (a_buf->size_real < 0) {
zc_error("pre-use of zlog_buf_resize fail, so can't convert");
return -1;
}
p = tmp + ZLOG_INT32_LEN;
do {
*--p = (unsigned char) (ui32 % 10 + '0');
} while (ui32 /= 10);
/* zero or space padding */
num_len = (tmp + ZLOG_INT32_LEN) - p;
if (width > num_len) {
zero_len = width - num_len;
out_len = width;
} else {
zero_len = 0;
out_len = num_len;
}
if ((q = a_buf->tail + out_len) > a_buf->end) {
int rc;
//zc_debug("size_left not enough, resize");
rc = zlog_buf_resize(a_buf, out_len - (a_buf->end - a_buf->tail));
if (rc > 0) {
size_t len_left;
zc_error("conf limit to %ld, can't extend, so output", a_buf->size_max);
len_left = a_buf->end - a_buf->tail;
if (len_left <= zero_len) {
zero_len = len_left;
num_len = 0;
} else if (len_left > zero_len) {
/* zero_len not changed */
num_len = len_left - zero_len;
}
memset(a_buf->tail, '0', zero_len);
memcpy(a_buf->tail + zero_len, p, num_len);
a_buf->tail += len_left;
//*(a_buf->tail) = '\0';
zlog_buf_truncate(a_buf);
return 1;
} else if (rc < 0) {
zc_error("zlog_buf_resize fail");
return -1;
} else {
//zc_debug("zlog_buf_resize succ, to[%ld]", a_buf->size_real);
q = a_buf->tail + out_len; /* re-calculate p*/
}
}
memset(a_buf->tail, '0', zero_len);
memcpy(a_buf->tail + zero_len, p, num_len);
a_buf->tail = q;
//*(a_buf->tail) = '\0';
return 0;
}