C语言向文本中插入数据

[f@pc-lzs MyTest]$ cat data.dat
000000012, 3 
000000023, 1 
000000123, 1 
000000124, 5 
[f@pc-lzs MyTest]$ ./test
[f@pc-lzs MyTest]$ cat data.dat
000000001, 5 
000000012, 3 
000000023, 6 
000000080, 10 
000000123, 1 
000000124, 5 
000000255, 2 

C/C++ code

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

#define DATAFILE "data.dat"
#define TMPFILE  "tmp.dat"

int InsertData(long code, long count)
{
        FILE * pCur, * pTmp;
        long lBarCode = 0;
        long lCount = 0;
        char bFound = 0;
        char cmpRet = 0;
        char * buf = NULL;

        pCur = fopen(DATAFILE, "r");
        pTmp = fopen(TMPFILE, "w");

        while (!feof(pCur) && !bFound)
        {
                fscanf(pCur, "%ld, %ld /n", &lBarCode, &lCount);
                if (lBarCode > code)    //当前行比写入行大
                {
                        fprintf(pTmp, "%09ld, %ld /n", code, count);    //写入数据
                        fprintf(pTmp, "%09ld, %ld /n", lBarCode, lCount);  //写入原数据
                        bFound = 1;
                }
                else if (lBarCode == code)      //当前行与写入行一样
                {
                        fprintf(pTmp, "%09ld, %ld /n", code, count);    //写入数据即替换原来的
                        bFound = 1;
                }
                else    //当前行比写入行小
                {
                        fprintf(pTmp, "%09ld, %ld /n", lBarCode, lCount);  //写入原数据
                }
        }

        if (bFound)     //如果找到了把原文件后面的内容拷贝到临时文件里
        {
                buf = malloc(1024);
                while (!feof(pCur))
                {
                        lCount = fread(buf, 1, 1024, pCur);
                        fwrite(buf, 1, lCount, pTmp);
                }
        }
        else    //没找到的话就写在最后面
        {
                fprintf(pTmp, "%09ld, %ld /n", code, count);    //写入数据
        }

        fclose(pCur);
        fclose(pTmp);

        remove(DATAFILE);               //删除原文件,改文件名
        rename(TMPFILE, DATAFILE);

        free(buf);

        return 0;
}

int main(void)
{
        InsertData(1, 5);
        InsertData(23, 6);
        InsertData(80, 9);
        InsertData(255, 2);
        InsertData(80, 10);

        return 0;
}