CSV2JSON

README.md

This C code recieves a CSV data from stdin, and returns the result via stdout. You can pipe your data to put and extract both input and output.

Features

• Supports automatic numberic conversion. (decimal only)
• Supports real-time output right from stdout.

Limitations

• Does not support double quoted items (therefore not RFC 4180 compatiable)

main.c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define _CRT_SECURE_NO_WARNINGS 1
#define MAX_LINE 400

void convert(wchar_t* item);
wchar_t buffer[MAX_LINE] = { 0 };
wchar_t* tmp;
_Bool flag = 0;

int main(int argc, char** argv) {
	printf("[");
	while (fgetws(buffer, MAX_LINE, stdin) != NULL) {
		if (flag) printf(",");
		wchar_t* item = wcstok(buffer, L",", &tmp);
		do convert(item); while ((item = wcstok(NULL, L",", &tmp)) != NULL);
		printf("]");
		flag = 1;
	}
	printf("]");
}

void convert(wchar_t* item) {
	int length = wcslen(item);
	wchar_t prefix = L',';
	_Bool numberic = 1;
	if (item[length - 1] == '\n') item[--length] = 0L;
	else if(buffer == item) prefix = L'[';
	for (int i = 0; i < length; i++) if (item[i] < L'0' || item[i] > L'9') {
		numberic = 0;
		break;
	}
	if(numberic) printf("%c%ls", prefix, item);
	else printf("%c\"%ls\"", prefix, item);
}