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csv_parser.c
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csv_parser.c
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/**
* Copyright (C) 2013 Tadas Vilkeliskis <vilkeliskis.t@gmail.com>
*
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <assert.h>
#include <stdlib.h>
#include <csv_parser.h>
void csv_parser_init(csv_parser_t *parser)
{
assert(parser);
parser->state = csvps_line_start;
parser->row = -1;
parser->col = -1;
parser->nread = 0;
parser->data = NULL;
}
size_t csv_parser_execute(csv_parser_t *parser,
const csv_parser_settings_t *settings,
const char *data,
size_t data_len)
{
assert(parser);
assert(settings);
assert(data);
const char *cursor = data;
const char *field_value = NULL;
const char *data_end = data + data_len;
int r;
parser->nread = 0;
if (data_len < 1) {
return 0;
}
while (cursor < data_end) {
char ch = *cursor;
switch (parser->state) {
case csvps_line_start:
field_value = NULL;
parser->row += 1;
parser->col = -1;
if (ch == '\r' || ch == '\n') {
parser->state = csvps_line_end_begin;
} else {
parser->state = csvps_field_start;
}
break;
case csvps_field_start:
parser->col += 1;
parser->state = csvps_field_value;
field_value = cursor;
break;
case csvps_field_value:
if (ch == settings->delimiter) {
parser->state = csvps_field_end;
} else if (ch == '\r' || ch == '\n') {
parser->state = csvps_line_end_begin;
} else {
// If we previously been in csvps_field_value state
// and field_value is not set, set it right away.
// This can happen when we execute parser multiple
// times in the value state.
if (field_value == NULL) {
field_value = cursor;
}
cursor++;
if (cursor == data_end) {
if (settings->field_cb && field_value) {
r = settings->field_cb(parser,
field_value,
cursor - field_value,
parser->row,
parser->col);
if (r) {
parser->state = csvps_error;
return parser->nread;
}
}
}
parser->nread++;
}
break;
case csvps_field_end:
// callback
if (settings->field_cb && field_value) {
r = settings->field_cb(parser,
field_value,
cursor - field_value,
parser->row,
parser->col);
if (r) {
parser->state = csvps_error;
return parser->nread;
}
}
parser->state = csvps_field_start;
cursor++;
parser->nread++;
break;
case csvps_line_end_begin:
// callback
if (settings->field_cb && field_value) {
r = settings->field_cb(parser,
field_value,
cursor - field_value,
parser->row,
parser->col);
if (r) {
parser->state = csvps_error;
return parser->nread;
}
}
parser->state = csvps_line_end;
break;
case csvps_line_end:
if (ch == '\r' || ch == '\n') {
cursor++;
parser->nread++;
} else {
parser->state = csvps_line_start;
}
break;
case csvps_error:
return parser->nread;
break;
default:
assert(0 && "invalid parser state");
break;
}
}
return parser->nread;
}