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Escape flight name in JSON in case it has odd characters.

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This commit is contained in:
Oliver Jowett 2015-01-21 11:56:27 +00:00
parent ebae590653
commit cae20a8060
1 changed files with 29 additions and 1 deletions
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30
net_io.c
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@ -699,6 +699,34 @@ int decodeHexMessage(struct client *c, char *hex) {
//
// Return a description of planes in json. No metric conversion
//
// usual caveats about function-returning-pointer-to-static-buffer apply
static const char *jsonEscapeString(const char *str) {
static char buf[1024];
const char *in = str;
char *out = buf, *end = buf + sizeof(buf) - 10;
for (; *in && out < end; ++in) {
unsigned char ch = *in;
if (ch == '"' || ch == '\\') {
*out++ = '\\';
*out++ = ch;
} else if (ch < 32 || ch > 127) {
*out++ = '\\';
*out++ = 'u';
*out++ = '0';
*out++ = '0';
*out++ = (ch >> 4) & 0x0f;
*out++ = ch & 0x0f;
} else {
*out++ = ch;
}
}
*out++ = 0;
return buf;
}
char *generateAircraftJson(const char *url_path, int *len) {
time_t now = time(NULL);
struct aircraft *a = Modes.aircrafts;
@ -729,7 +757,7 @@ char *generateAircraftJson(const char *url_path, int *len) {
if (a->bFlags & MODES_ACFLAGS_SQUAWK_VALID)
p += snprintf(p, end-p, ",\"squawk\":\"%04x\"", a->modeA);
if (a->bFlags & MODES_ACFLAGS_CALLSIGN_VALID)
p += snprintf(p, end-p, ",\"flight\":\"%s\"", a->flight);
p += snprintf(p, end-p, ",\"flight\":\"%s\"", jsonEscapeString(a->flight));
if (a->bFlags & MODES_ACFLAGS_LATLON_VALID)
p += snprintf(p, end-p, ",\"lat\":%f,\"lon\":%f,\"seen_pos\":%d", a->lat, a->lon, (int)(now - a->seenLatLon));
if ((a->bFlags & MODES_ACFLAGS_AOG_VALID) && (a->bFlags & MODES_ACFLAGS_AOG))