nginx/src/core/ngx_buf.c

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/*
* Copyright (C) 2002-2004 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;
if (!(b = ngx_calloc_buf(pool))) {
return NULL;
}
if (!(b->start = ngx_palloc(pool, size))) {
return NULL;
}
b->pos = b->start;
b->last = b->start;
b->end = b->last + size;
b->temporary = 1;
/*
b->file_pos = 0;
b->file_last = 0;
b->file = NULL;
b->shadow = NULL;
b->tag = 0;
*/
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;
if (!(p = ngx_palloc(pool, bufs->num * bufs->size))) {
return NULL;
}
ll = &chain;
for (i = 0; i < bufs->num; i++) {
if (!(b = ngx_calloc_buf(pool))) {
return NULL;
}
b->pos = p;
b->last = p;
b->temporary = 1;
b->start = p;
p += bufs->size;
b->end = p;
/*
b->file_pos = 0;
b->file_last = 0;
b->file = NULL;
b->shadow = NULL;
b->tag = 0;
*/
if (!(cl = ngx_alloc_chain_link(pool))) {
return NULL;
}
cl->buf = b;
*ll = cl;
ll = &cl->next;
}
*ll = NULL;
return chain;
}
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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) {
ngx_test_null(cl, ngx_alloc_chain_link(pool), 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 *tl;
if (*busy == NULL) {
*busy = *out;
} else {
for (tl = *busy; /* void */ ; tl = tl->next) {
if (tl->next == NULL) {
tl->next = *out;
break;
}
}
}
*out = NULL;
while (*busy) {
if (ngx_buf_size((*busy)->buf) != 0) {
break;
}
#if (HAVE_WRITE_ZEROCOPY)
if ((*busy)->buf->zerocopy_busy) {
break;
}
#endif
if ((*busy)->buf->tag != tag) {
*busy = (*busy)->next;
continue;
}
(*busy)->buf->pos = (*busy)->buf->last = (*busy)->buf->start;
tl = *busy;
*busy = (*busy)->next;
tl->next = *free;
*free = tl;
}
}