fgetc,fgets,getline用法

来源：互联网发布：上海微创软件技术支持编辑：程序博客网时间：2024/05/16 11:10

Linux(Ubuntu)下用法

在Ubuntu下shell中，man fgets可以看到fgetc, fgets等用法，man getline可以看到getline用法。

#include <stdio.h>int fgetc(FILE *stream);char *fgets(char *s, int size, FILE *stream);ssize_t getline(char **lineptr, size_t *n, FILE *stream);

按照用法说明，编写测试用例如下：

/* * fgetc1.c * shows how to use fgetc */#include <stdio.h>int main(){    int ch;    while ((ch = fgetc(stdin)) != EOF) {        printf("%c\n", ch);    }    return 0;}

/* * fgets1.c * shows how to use fgets */#include <stdio.h>int main(int ac, char *av[]){       const int csize = 10;    char buffer[csize];    while (fgets(buffer, csize, stdin) != NULL) {       printf("%s\n", buffer);    }       return 0;}

测试用例getline1.c和getline2.c分别从标准输入流和文件流读取一行。

/* * getline1.c * shows how to use getline */#include <stdio.h>int main(int ac, char *av[]){    size_t size = 0;    const int csize = 100;    char *buffer;    ssize_t read;    while ((read = getline(&buffer, &size, stdin)) != -1) {            printf("%s", buffer);    }    return 0;}

/* * getline2.c * shows how to get line from files */#include <stdio.h>int main(){    FILE *fp;    size_t size = 0;    ssize_t read;    char *buffer;    char *filename = "/home/cheewing/Documents/ULPP/mytest/getlinefile.dat";    if ((fp = fopen(filename, "r")) == NULL)             perror("open file \n");    while ((read = getline(&buffer, &size, fp)) != -1) {            printf("%s\n", buffer);    }    fclose(fp);    return 0;}

0 0