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#include "upb/stdc/io.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "upb/stdc/error.h"
// We can make this configurable if necessary.
#define BUF_SIZE 32768
/* upb_stdio ******************************************************************/
int upb_stdio_cmpbuf(const void *_key, const void *_elem) {
const uint64_t *ofs = _key;
const upb_stdio_buf *buf = _elem;
return (*ofs / BUF_SIZE) - (buf->ofs / BUF_SIZE);
}
static upb_stdio_buf *upb_stdio_findbuf(const upb_stdio *s, uint64_t ofs) {
// TODO: it is probably faster to linear search short lists, and to
// special-case the last one or two bufs.
return bsearch(&ofs, s->bufs, s->nbuf, sizeof(*s->bufs), &upb_stdio_cmpbuf);
}
static upb_stdio_buf *upb_stdio_rotatebufs(upb_stdio *s) {
upb_stdio_buf **reuse = NULL; // XXX
int num_reused = 0, num_inuse = 0;
// Could sweep only a subset of bufs if this was a hotspot.
for (int i = 0; i < s->nbuf; i++) {
upb_stdio_buf *buf = s->bufs[i];
if (buf->refcount > 0) {
s->bufs[num_inuse++] = buf;
} else {
reuse[num_reused++] = buf;
}
}
UPB_ASSERT(num_reused + num_inuse == s->nbuf);
memcpy(s->bufs + num_inuse, reuse, num_reused * sizeof(upb_stdio_buf*));
if (num_reused == 0) {
++s->nbuf;
s->bufs = realloc(s->bufs, s->nbuf * sizeof(*s->bufs));
s->bufs[s->nbuf-1] = malloc(sizeof(upb_stdio_buf) + BUF_SIZE);
return s->bufs[s->nbuf-1];
}
return s->bufs[s->nbuf-num_reused];
}
void upb_stdio_discard(void *src, uint64_t ofs) {
(void)src;
(void)ofs;
}
upb_bytesuccess_t upb_stdio_fetch(void *src, uint64_t ofs, size_t *bytes_read) {
(void)ofs;
upb_stdio *stdio = (upb_stdio*)src;
upb_stdio_buf *buf = upb_stdio_rotatebufs(stdio);
retry:
*bytes_read = fread(&buf->data, 1, BUF_SIZE, stdio->file);
buf->len = *bytes_read;
if (*bytes_read < (size_t)BUF_SIZE) {
// Error or EOF.
if (feof(stdio->file)) {
upb_status_seteof(&stdio->src.status);
return UPB_BYTE_EOF;
}
if (ferror(stdio->file)) {
#ifdef EINTR
// If we encounter a client who doesn't want to retry EINTR, we can easily
// add a boolean property of the stdio that controls this behavior.
if (errno == EINTR) {
clearerr(stdio->file);
goto retry;
}
#endif
upb_status_fromerrno(&stdio->src.status, errno);
return upb_errno_is_wouldblock(errno) ?
UPB_BYTE_WOULDBLOCK : UPB_BYTE_ERROR;
}
UPB_ASSERT(false);
}
return UPB_BYTE_OK;
}
void upb_stdio_copy(const void *src, uint64_t ofs, size_t len, char *dst) {
upb_stdio_buf *buf = upb_stdio_findbuf(src, ofs);
ofs -= buf->ofs;
memcpy(dst, buf->data + ofs, BUF_SIZE - ofs);
len -= (BUF_SIZE - ofs);
dst += (BUF_SIZE - ofs);
while (len > 0) {
++buf;
size_t bytes = UPB_MIN(len, BUF_SIZE);
memcpy(dst, buf->data, bytes);
len -= bytes;
dst += bytes;
}
}
const char *upb_stdio_getptr(const void *src, uint64_t ofs, size_t *len) {
upb_stdio_buf *buf = upb_stdio_findbuf(src, ofs);
ofs -= buf->ofs;
*len = BUF_SIZE - ofs;
return &buf->data[ofs];
}
#if 0
upb_strlen_t upb_stdio_putstr(upb_bytesink *sink, upb_string *str, upb_status *status) {
upb_stdio *stdio = (upb_stdio*)((char*)sink - offsetof(upb_stdio, sink));
upb_strlen_t len = upb_string_len(str);
upb_strlen_t written = fwrite(upb_string_getrobuf(str), 1, len, stdio->file);
if (written < len) {
upb_status_setf(status, UPB_ERROR, "Error writing to stdio stream.");
return -1;
}
return written;
}
uint32_t upb_stdio_vprintf(upb_bytesink *sink, upb_status *status,
const char *fmt, va_list args) {
upb_stdio *stdio = (upb_stdio*)((char*)sink - offsetof(upb_stdio, sink));
int written = vfprintf(stdio->file, fmt, args);
if (written < 0) {
upb_status_seterrf(status, "Error writing to stdio stream.");
return -1;
}
return written;
}
#endif
void upb_stdio_init(upb_stdio *stdio) {
static upb_bytesrc_vtbl bytesrc_vtbl = {
&upb_stdio_fetch,
&upb_stdio_discard,
&upb_stdio_copy,
&upb_stdio_getptr,
};
upb_bytesrc_init(&stdio->src, &bytesrc_vtbl);
//static upb_bytesink_vtbl bytesink_vtbl = {
// upb_stdio_putstr,
// upb_stdio_vprintf
//};
//upb_bytesink_init(&stdio->bytesink, &bytesink_vtbl);
}
void upb_stdio_reset(upb_stdio* stdio, FILE *file) {
stdio->file = file;
stdio->should_close = false;
}
void upb_stdio_open(upb_stdio *stdio, const char *filename, const char *mode,
upb_status *s) {
FILE *f = fopen(filename, mode);
if (!f) {
upb_status_fromerrno(s, errno);
return;
}
setvbuf(stdio->file, NULL, _IONBF, 0); // Disable buffering; we do our own.
upb_stdio_reset(stdio, f);
stdio->should_close = true;
}
void upb_stdio_uninit(upb_stdio *stdio) {
// Can't report status; caller should flush() to ensure data is written.
if (stdio->should_close) fclose(stdio->file);
stdio->file = NULL;
}
upb_bytesrc* upb_stdio_bytesrc(upb_stdio *stdio) { return &stdio->src; }
upb_bytesink* upb_stdio_bytesink(upb_stdio *stdio) { return &stdio->sink; }
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