147 lines
2.7 KiB
C++
147 lines
2.7 KiB
C++
#include "fdbclient/JsonBuilder.h"
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#include <iostream>
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JsonBuilderObject JsonBuilder::makeMessage(const char* name, const char* description) {
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JsonBuilderObject out;
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out["name"] = name;
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out["description"] = description;
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return out;
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}
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// dst must have at least len + 3 bytes available (".e" becomes "0.0e0")
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// Returns bytes written, or 0 on failure.
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int JsonBuilder::coerceAsciiNumberToJSON(const char* s, int len, char* dst) {
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if (len == 0) {
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return 0;
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}
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const char* send = s + len;
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char* wptr = dst;
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bool dot = false;
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// Allow one optional sign
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if (*s == '-') {
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*wptr++ = *s++;
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// Output not yet valid so return failure
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if (s == send) {
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return 0;
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}
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}
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// 'inf' becomes 1e99
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if (*s == 'i') {
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if (len >= 3 && (strncmp(s, "inf", 3) == 0)) {
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strcpy(wptr, "1e99");
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return 4 + wptr - dst;
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}
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// Anything else starting with 'i' is a failure
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return 0;
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}
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// Skip leading zeroes
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while (*s == '0') {
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++s;
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// If found end, number is valid and zero
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if (s == send) {
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*wptr++ = '0';
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return wptr - dst;
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}
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}
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// If a dot is found, write a zero before it
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if (*s == '.') {
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dot = true;
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*wptr++ = '0';
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*wptr++ = *s++;
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// If found end, add a zero and return
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if (s == send) {
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*wptr++ = '0';
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return wptr - dst;
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}
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// If there is no digit after the dot, write a zero
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if (!isdigit(*s)) {
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*wptr++ = '0';
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}
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}
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// Write all digits found
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while (isdigit(*s)) {
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*wptr++ = *s++;
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// If found end, number is valid so return
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if (s == send) {
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return wptr - dst;
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}
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}
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// If there is a dot, return unless its the first
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if (*s == '.') {
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if (dot) {
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return wptr - dst;
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}
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*wptr++ = *s++;
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// If found end, add a zero and return
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if (s == send) {
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*wptr++ = '0';
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return wptr - dst;
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}
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// If there are more digits write them, else write a 0
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if (isdigit(*s)) {
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do {
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*wptr++ = *s++;
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// If found end, number is valid so return
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if (s == send) {
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return wptr - dst;
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}
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} while (isdigit(*s));
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} else {
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*wptr++ = '0';
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}
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}
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// Now we can have an e or E, else stop
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if (*s == 'e' || *s == 'E') {
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*wptr++ = *s++;
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// If found end, add a zero and return
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if (s == send) {
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*wptr++ = '0';
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return wptr - dst;
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}
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// Allow one optional sign
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if (*s == '-' || *s == '+') {
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*wptr++ = *s++;
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}
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// If found end, add a zero and return
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if (s == send) {
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*wptr++ = '0';
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return wptr - dst;
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}
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// If there are more digits write then, else write a 0
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if (isdigit(*s)) {
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do {
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*wptr++ = *s++;
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// If found end, number is valid so return
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if (s == send) {
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return wptr - dst;
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}
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} while (isdigit(*s));
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} else {
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*wptr++ = '0';
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}
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}
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return wptr - dst;
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}
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