C标准IO实现文件拷贝

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实现类似cp的功能，并且统计文件行数

/*************************************************************************> File Name: fgp_copy.c> Author: XXDK> Email: v.manstein@qq.com > Created Time: Mon 13 Mar 2017 12:25:28 AM PDT ************************************************************************/#include<stdio.h>#include<stdlib.h>#include<string.h>int main(int argc, const char* argv[]){if(argc != 3) {printf("usage <cmd src dest>\n");exit(-1);}FILE* fp_src = fopen(argv[1], "r");if(NULL == fp_src) {perror("fopen error\n");exit(-1);}FILE* fp_dest = fopen(argv[2], "w");if(NULL == fp_dest) {printf("fopne error\n");fclose(fp_src);exit(-1);}char buf[100] = {0};char *ret = NULL;unsigned line_count;int len = 0;while(1) {ret = fgets(buf, 100, fp_src);if(NULL == ret){break;}// 检测每一行的 \n 换行符len = strlen(buf);if('\n' == buf[len - 1]) {line_count++;}fputs(buf, fp_dest);}printf("line: %d\n", line_count);return 0;}

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