APUE学习笔记 标准I/O库 显示文件每行的长度

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char **argv)
{
        FILE *fp;
        static char *linebuf = NULL;
        static size_t linesize = 0;
        if(argc < 2)
        {
                fprintf(stderr, "Usage...\n");
                exit(1);
        }
        fp = fopen(argv[1], "r");
        if((fp == NULL))
        {
                perror("fopen() error");
                exit(1);
        }
        while(1)
        {
                if(getline(&linebuf, &linesize, fp) < 0)
                {
                        break;
                }
                printf("%d\n", strlen(linebuf));
        }
        fclose(fp);
        return 0;
}
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