mirror of https://github.com/ArduPilot/ardupilot
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
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#include "SIM_Aircraft.h"
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#include <AP_Filesystem/AP_Filesystem.h>
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#if USE_PICOJSON
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#include "picojson.h"
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/*
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load JSON file, returning a picojson object or nullptr on failure
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*/
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void *load_json(const char *filename)
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{
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struct stat st;
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if (AP::FS().stat(filename, &st) != 0) {
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::printf("No such json file %s\n", filename);
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return nullptr;
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}
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int fd = AP::FS().open(filename, O_RDONLY);
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if (fd == -1) {
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::printf("failed to open json %s\n", filename);
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return nullptr;
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}
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char buf[st.st_size+1];
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memset(buf, '\0', sizeof(buf));
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if (AP::FS().read(fd, buf, st.st_size) != st.st_size) {
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::printf("failed to read json %s\n", filename);
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AP::FS().close(fd);
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return nullptr;
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}
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AP::FS().close(fd);
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char *start = strchr(buf, '{');
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if (!start) {
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::printf("Invalid json %s", filename);
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return nullptr;
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}
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/*
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remove comments, as not allowed by the parser
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*/
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for (char *p = strchr(start,'#'); p; p=strchr(p+1, '#')) {
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// clear to end of line
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do {
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*p++ = ' ';
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} while (*p != '\n' && *p != '\r' && *p);
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}
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picojson::value *obj = new picojson::value;
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if (obj == nullptr) {
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::printf("Invalid allocate json for %s", filename);
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return nullptr;
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}
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std::string err = picojson::parse(*obj, start);
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if (!err.empty()) {
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::printf("parse failed for json %s", filename);
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delete obj;
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return nullptr;
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}
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return obj;
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}
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#endif // USE_PICOJSON
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