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#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/jemalloc_internal_includes.h"
#include "jemalloc/internal/buf_writer.h"
#include "jemalloc/internal/malloc_io.h"
static void *
buf_writer_allocate_internal_buf(tsdn_t *tsdn, size_t buf_len) {
#ifdef JEMALLOC_JET
if (buf_len > SC_LARGE_MAXCLASS) {
return NULL;
}
#else
assert(buf_len <= SC_LARGE_MAXCLASS);
#endif
return iallocztm(tsdn, buf_len, sz_size2index(buf_len), false, NULL,
true, arena_get(tsdn, 0, false), true);
}
static void
buf_writer_free_internal_buf(tsdn_t *tsdn, void *buf) {
if (buf != NULL) {
idalloctm(tsdn, buf, NULL, NULL, true, true);
}
}
static void
buf_writer_assert(buf_writer_t *buf_writer) {
assert(buf_writer != NULL);
assert(buf_writer->write_cb != NULL);
if (buf_writer->buf != NULL) {
assert(buf_writer->buf_size > 0);
} else {
assert(buf_writer->buf_size == 0);
assert(buf_writer->internal_buf);
}
assert(buf_writer->buf_end <= buf_writer->buf_size);
}
bool
buf_writer_init(tsdn_t *tsdn, buf_writer_t *buf_writer, write_cb_t *write_cb,
void *cbopaque, char *buf, size_t buf_len) {
if (write_cb != NULL) {
buf_writer->write_cb = write_cb;
} else {
buf_writer->write_cb = je_malloc_message != NULL ?
je_malloc_message : wrtmessage;
}
buf_writer->cbopaque = cbopaque;
assert(buf_len >= 2);
if (buf != NULL) {
buf_writer->buf = buf;
buf_writer->internal_buf = false;
} else {
buf_writer->buf = buf_writer_allocate_internal_buf(tsdn,
buf_len);
buf_writer->internal_buf = true;
}
if (buf_writer->buf != NULL) {
buf_writer->buf_size = buf_len - 1; /* Allowing for '\0'. */
} else {
buf_writer->buf_size = 0;
}
buf_writer->buf_end = 0;
buf_writer_assert(buf_writer);
return buf_writer->buf == NULL;
}
void
buf_writer_flush(buf_writer_t *buf_writer) {
buf_writer_assert(buf_writer);
if (buf_writer->buf == NULL) {
return;
}
buf_writer->buf[buf_writer->buf_end] = '\0';
buf_writer->write_cb(buf_writer->cbopaque, buf_writer->buf);
buf_writer->buf_end = 0;
buf_writer_assert(buf_writer);
}
void
buf_writer_cb(void *buf_writer_arg, const char *s) {
buf_writer_t *buf_writer = (buf_writer_t *)buf_writer_arg;
buf_writer_assert(buf_writer);
if (buf_writer->buf == NULL) {
buf_writer->write_cb(buf_writer->cbopaque, s);
return;
}
size_t i, slen, n;
for (i = 0, slen = strlen(s); i < slen; i += n) {
if (buf_writer->buf_end == buf_writer->buf_size) {
buf_writer_flush(buf_writer);
}
size_t s_remain = slen - i;
size_t buf_remain = buf_writer->buf_size - buf_writer->buf_end;
n = s_remain < buf_remain ? s_remain : buf_remain;
memcpy(buf_writer->buf + buf_writer->buf_end, s + i, n);
buf_writer->buf_end += n;
buf_writer_assert(buf_writer);
}
assert(i == slen);
}
void
buf_writer_terminate(tsdn_t *tsdn, buf_writer_t *buf_writer) {
buf_writer_assert(buf_writer);
buf_writer_flush(buf_writer);
if (buf_writer->internal_buf) {
buf_writer_free_internal_buf(tsdn, buf_writer->buf);
}
}
void
buf_writer_pipe(buf_writer_t *buf_writer, read_cb_t *read_cb,
void *read_cbopaque) {
/*
* A tiny local buffer in case the buffered writer failed to allocate
* at init.
*/
static char backup_buf[16];
static buf_writer_t backup_buf_writer;
buf_writer_assert(buf_writer);
assert(read_cb != NULL);
if (buf_writer->buf == NULL) {
buf_writer_init(TSDN_NULL, &backup_buf_writer,
buf_writer->write_cb, buf_writer->cbopaque, backup_buf,
sizeof(backup_buf));
buf_writer = &backup_buf_writer;
}
assert(buf_writer->buf != NULL);
ssize_t nread = 0;
do {
buf_writer->buf_end += nread;
buf_writer_assert(buf_writer);
if (buf_writer->buf_end == buf_writer->buf_size) {
buf_writer_flush(buf_writer);
}
nread = read_cb(read_cbopaque,
buf_writer->buf + buf_writer->buf_end,
buf_writer->buf_size - buf_writer->buf_end);
} while (nread > 0);
buf_writer_flush(buf_writer);
}
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