c csv 保存函数

#include <stdio.h>
#include <stdlib.h>
#include <string>

int save_csv(const char *file_path, unsigned char *data, int row, int col);

int main() {
    int i = 0;
    const char *path = "C:\\Users\\28260\\Desktop\\test.csv";
    unsigned char data[100];
    for (int i = 0 ; i < 100; ++i) {
        data[i] = 'a' + i % ('z'-'a');
    } 
    save_csv(path, data, 10, 10);
    return 0;
} 

int save_csv(const char *file_path, unsigned char *data, int row, int col) {
    FILE *file = NULL;
    int err = 0;
    do {
        if (NULL == file_path || NULL == data)
        {
            err = -1;
            break;
        }
        file = fopen(file_path, "wb");
        if (NULL == file)
        {
            err = -2;
            break;
        }
        for (int i = 0; i < row; ++i) {            
            for (int j = 0; j < col; ++j) {
                fwrite(data++, sizeof(char), 1, file);
                fwrite(",", sizeof(char), 1, file);
            }
            fwrite("\n", sizeof(char), 1, file);
        }
        fflush(file);
    } while (0);
    if (file != NULL)
    {
        fclose(file);
    }
    return err;
}