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/*
Copyright(C) 2015 Brazil
Copyright(C) 2019-2022 Sutou Kouhei <kou@clear-code.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "grn_ctx.h"
#include "grn_str.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef WIN32
# include <share.h>
#else
# include <sys/select.h>
#endif /* WIN32 */
struct _grn_file_reader {
FILE *file;
bool file_need_close;
};
grn_file_reader *
grn_file_reader_open(grn_ctx *ctx, const char *path)
{
grn_file_reader *reader;
FILE *file;
bool file_need_close;
GRN_API_ENTER;
if (!path) {
ERR(GRN_INVALID_ARGUMENT, "[file-reader][open] path must not NULL");
GRN_API_RETURN(NULL);
}
if (strcmp(path, "-") == 0) {
file = stdin;
file_need_close = false;
} else {
file = grn_fopen(path, "r");
if (!file) {
SERR("[file-reader][open] failed to open path: <%s>", path);
GRN_API_RETURN(NULL);
}
file_need_close = true;
}
reader = GRN_CALLOC(sizeof(grn_file_reader));
if (!reader) {
if (file_need_close) {
fclose(file);
}
ERR(GRN_NO_MEMORY_AVAILABLE,
"[file-reader][open] failed to allocate reader: <%s>", path);
GRN_API_RETURN(NULL);
}
reader->file = file;
reader->file_need_close = file_need_close;
GRN_API_RETURN(reader);
}
void
grn_file_reader_close(grn_ctx *ctx, grn_file_reader *reader)
{
if (!reader) {
return;
}
if (reader->file_need_close) {
if (fclose(reader->file) != 0) {
GRN_LOG(ctx, GRN_LOG_ERROR,
"[file-reader][close] failed to close: <%s>",
grn_strerror(errno));
}
}
GRN_FREE(reader);
}
grn_rc
grn_file_reader_read_line(grn_ctx *ctx,
grn_file_reader *reader,
grn_obj *buffer)
{
grn_rc rc = GRN_END_OF_DATA;
for (;;) {
size_t len;
#define BUFFER_SIZE 4096
grn_rc reserve_rc = grn_bulk_reserve(ctx, buffer, BUFFER_SIZE);
if (reserve_rc != GRN_SUCCESS) {
rc = reserve_rc;
break;
}
if (!fgets(GRN_BULK_CURR(buffer), BUFFER_SIZE, reader->file)) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
int fd = grn_fileno(reader->file);
int n_fds = 1;
fd_set read_fds;
FD_ZERO(&read_fds);
FD_SET(fd, &read_fds);
int n_ready_fds = select(n_fds, &read_fds, NULL, NULL, NULL);
if (n_ready_fds != 1) {
break;
}
errno = 0;
continue;
}
break;
}
#undef BUFFER_SIZE
if (!(len = strlen(GRN_BULK_CURR(buffer)))) { break; }
GRN_BULK_INCR_LEN(buffer, len);
rc = GRN_SUCCESS;
if (GRN_BULK_CURR(buffer)[-1] == '\n') { break; }
}
return rc;
}
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