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#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <json_object.h>
#include <json_tokener.h>
#include "conn.h"
#include "vali.h"
static bool buffer_grow(struct vali_buffer *buf, size_t n) {
if (buf->cap >= buf->size + n) {
return true;
}
size_t new_cap = buf->cap;
if (new_cap == 0) {
new_cap = 4096;
}
while (new_cap < buf->size + n) {
new_cap *= 2;
}
char *new_data = realloc(buf->data, new_cap);
if (new_data == NULL) {
return false;
}
buf->data = new_data;
buf->cap = new_cap;
return true;
}
static void buffer_shift(struct vali_buffer *buf, size_t n) {
if (n == buf->size) {
buf->size = 0;
} else {
memmove(buf->data, &buf->data[n], buf->size - n);
buf->size -= n;
}
}
void conn_init(struct vali_conn *conn, int fd) {
*conn = (struct vali_conn){ .fd = fd };
}
void conn_finish(struct vali_conn *conn) {
close(conn->fd);
free(conn->in.data);
free(conn->out.data);
}
bool conn_enqueue(struct vali_conn *conn, struct json_object *obj) {
const char *raw = json_object_to_json_string(obj);
size_t raw_size = strlen(raw) + 1;
if (!buffer_grow(&conn->out, raw_size)) {
return false;
}
memcpy(&conn->out.data[conn->out.size], raw, raw_size);
conn->out.size += raw_size;
json_object_put(obj);
return true;
}
bool conn_flush(struct vali_conn *conn) {
size_t n_written = 0;
bool ok = true;
while (n_written < conn->out.size) {
ssize_t n = write(conn->fd, &conn->out.data[n_written], conn->out.size - n_written);
if (n < 0) {
if (errno == EINTR) {
continue;
} else if (errno == EAGAIN) {
break;
}
ok = false;
break;
}
n_written += (size_t)n;
}
buffer_shift(&conn->out, n_written);
return ok;
}
static ssize_t conn_find_in_buf_end(struct vali_conn *conn, size_t offset, size_t len) {
for (size_t i = offset; i < offset + len; i++) {
if (conn->in.data[i] == '\0') {
return (ssize_t)i;
}
}
return -1;
}
bool conn_receive(struct vali_conn *conn, bool *eof) {
*eof = false;
if (conn_find_in_buf_end(conn, 0, conn->in.size) >= 0) {
return true;
}
while (true) {
if (!buffer_grow(&conn->in, 4096)) {
return false;
}
size_t max = conn->in.cap - conn->in.size;
ssize_t n = read(conn->fd, &conn->in.data[conn->in.size], max);
if (n < 0) {
if (errno == EINTR) {
continue;
} else if (errno == EAGAIN) {
break;
}
return false;
} else if (n == 0) {
*eof = true;
break;
}
conn->in.size += (size_t)n;
if (conn_find_in_buf_end(conn, conn->in.size - (size_t)n, (size_t)n) >= 0) {
break;
}
}
return true;
}
bool conn_dequeue(struct vali_conn *conn, struct json_object **out) {
*out = NULL;
ssize_t end = conn_find_in_buf_end(conn, 0, conn->in.size);
if (end < 0) {
return true;
}
struct json_object *obj = json_tokener_parse(conn->in.data);
size_t msg_size = (size_t)end + 1;
buffer_shift(&conn->in, msg_size);
*out = obj;
return true;
}
bool set_sockaddr_un(struct sockaddr_un *addr, const char *path) {
*addr = (struct sockaddr_un){ .sun_family = AF_UNIX };
size_t path_len = strlen(path);
if (path_len >= sizeof(addr->sun_path)) {
return false;
}
memcpy(addr->sun_path, path, path_len + 1);
return true;
}
bool set_cloexec(int fd) {
int flags = fcntl(fd, F_GETFD, 0);
if (flags < 0) {
return false;
}
flags |= FD_CLOEXEC;
return fcntl(fd, F_SETFD, flags) != -1;
}
bool set_nonblock(int fd) {
int flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
return false;
}
flags |= O_NONBLOCK;
return fcntl(fd, F_SETFL, flags) != -1;
}
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