mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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165 lines
3.6 KiB
C++
165 lines
3.6 KiB
C++
/* Line-based formats.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <villas/exceptions.hpp>
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#include <villas/formats/line.hpp>
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using namespace villas;
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using namespace villas::node;
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int LineFormat::sprint(char *buf, size_t len, size_t *wbytes,
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const struct Sample *const smps[], unsigned cnt) {
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unsigned i;
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size_t off = 0;
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for (i = 0; i < cnt && off < len; i++)
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off += sprintLine(buf + off, len - off, smps[i]);
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if (wbytes)
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*wbytes = off;
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return i;
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}
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int LineFormat::sscan(const char *buf, size_t len, size_t *rbytes,
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struct Sample *const smps[], unsigned cnt) {
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unsigned i;
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size_t off = 0;
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if (skip_first_line) {
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if (!first_line_skipped) {
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while (off < len) {
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if (buf[off++] == delimiter)
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break;
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}
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first_line_skipped = true;
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}
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}
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for (i = 0; i < cnt && off < len; i++) {
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// Skip comment lines
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if (buf[off] == comment) {
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while (off < len) {
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if (buf[++off] == delimiter)
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break;
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}
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if (off == len)
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break;
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}
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off += sscanLine(buf + off, len - off, smps[i]);
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}
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if (rbytes)
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*rbytes = off;
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return i;
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}
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int LineFormat::print(FILE *f, const struct Sample *const smps[],
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unsigned cnt) {
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int ret;
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unsigned i;
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if (cnt > 0 && smps[0]->signals)
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header(f, smps[0]->signals);
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for (i = 0; i < cnt; i++) {
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size_t wbytes;
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ret = sprint(out.buffer, out.buflen, &wbytes, &smps[i], 1);
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if (ret < 0)
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return ret;
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fwrite(out.buffer, wbytes, 1, f);
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}
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return i;
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}
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int LineFormat::scan(FILE *f, struct Sample *const smps[], unsigned cnt) {
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int ret;
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unsigned i;
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ssize_t bytes;
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if (skip_first_line) {
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if (!first_line_skipped) {
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bytes = getdelim(&in.buffer, &in.buflen, delimiter, f);
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if (bytes < 0)
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return -1; // An error or eof occured
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first_line_skipped = true;
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}
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}
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for (i = 0; i < cnt && !feof(f); i++) {
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size_t rbytes;
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char *ptr;
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skip:
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bytes = getdelim(&in.buffer, &in.buflen, delimiter, f);
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if (feof(f))
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break;
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else if (bytes < 0)
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return -1; // An error or eof occured
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// Skip whitespaces, empty and comment lines
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for (ptr = in.buffer; isspace(*ptr); ptr++)
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;
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if (ptr[0] == '\0' || ptr[0] == comment)
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goto skip;
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ret = sscan(in.buffer, bytes, &rbytes, &smps[i], 1);
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if (ret < 0)
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return ret;
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}
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return i;
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}
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void LineFormat::parse(json_t *json) {
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int ret;
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json_error_t err;
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const char *delim = nullptr;
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const char *com = nullptr;
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int header = -1;
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int skip = -1;
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ret = json_unpack_ex(json, &err, 0, "{ s?: s, s?: b, s?: b, s?: s }",
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"delimiter", &delim, "header", &header,
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"skip_first_line", &skip, "comment_prefix", &com);
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if (ret)
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throw ConfigError(json, err, "node-config-format-line",
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"Failed to parse format configuration");
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if (delim) {
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if (strlen(delim) != 1)
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throw ConfigError(json, "node-config-format-line-delimiter",
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"Line delimiter must be a single character!");
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delimiter = delim[0];
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}
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if (com) {
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if (strlen(com) != 1)
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throw ConfigError(json, "node-config-format-line-comment_prefix",
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"Comment prefix must be a single character!");
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comment = com[0];
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}
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if (header >= 0)
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print_header = header;
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if (skip >= 0)
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skip_first_line = skip;
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Format::parse(json);
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}
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