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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
ngx_buf_t *
ngx_create_temp_buf(ngx_pool_t *pool, size_t size)
{
ngx_buf_t *b;
b = ngx_calloc_buf(pool);
if (b == NULL) {
return NULL;
}
b->start = ngx_palloc(pool, size);
if (b->start == NULL) {
return NULL;
}
/*
* set by ngx_calloc_buf():
*
* b->file_pos = 0;
* b->file_last = 0;
* b->file = NULL;
* b->shadow = NULL;
* b->tag = 0;
*
*/
b->pos = b->start;
b->last = b->start;
b->end = b->last + size;
b->temporary = 1;
return b;
}
ngx_chain_t *
ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs)
{
u_char *p;
ngx_int_t i;
ngx_buf_t *b;
ngx_chain_t *chain, *cl, **ll;
p = ngx_palloc(pool, bufs->num * bufs->size);
if (p == NULL) {
return NULL;
}
ll = &chain;
for (i = 0; i < bufs->num; i++) {
b = ngx_calloc_buf(pool);
if (b == NULL) {
return NULL;
}
/*
* set by ngx_calloc_buf():
*
* b->file_pos = 0;
* b->file_last = 0;
* b->file = NULL;
* b->shadow = NULL;
* b->tag = 0;
*
*/
b->pos = p;
b->last = p;
b->temporary = 1;
b->start = p;
p += bufs->size;
b->end = p;
cl = ngx_alloc_chain_link(pool);
if (cl == NULL) {
return NULL;
}
cl->buf = b;
*ll = cl;
ll = &cl->next;
}
*ll = NULL;
return chain;
}
ngx_int_t
ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in)
{
ngx_chain_t *cl, **ll;
ll = chain;
for (cl = *chain; cl; cl = cl->next) {
ll = &cl->next;
}
while (in) {
cl = ngx_alloc_chain_link(pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = in->buf;
*ll = cl;
ll = &cl->next;
in = in->next;
}
*ll = NULL;
return NGX_OK;
}
void
ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
ngx_chain_t **out, ngx_buf_tag_t tag)
{
ngx_chain_t *cl;
if (*busy == NULL) {
*busy = *out;
} else {
for (cl = *busy; cl->next; cl = cl->next) { /* void */ }
cl->next = *out;
}
*out = NULL;
while (*busy) {
if (ngx_buf_size((*busy)->buf) != 0) {
break;
}
#if (NGX_HAVE_WRITE_ZEROCOPY)
if ((*busy)->buf->zerocopy_busy) {
break;
}
#endif
if ((*busy)->buf->tag != tag) {
*busy = (*busy)->next;
continue;
}
(*busy)->buf->pos = (*busy)->buf->start;
(*busy)->buf->last = (*busy)->buf->start;
cl = *busy;
*busy = cl->next;
cl->next = *free;
*free = cl;
}
}
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