stroke 文件 以及文件io返回值

#include <stdio.h>#include <string.h>int main(int argc, char *argv[]){    char buf[4096], *p, *delim = ",.\n;-()& "; //注意里面有一个空格    FILE *fp;    if (argc < 2) {        printf("./a.out filename\n");        return 1;    }    fp = fopen(argv[1], "r");    while (fgets(buf, sizeof(buf), fp)) {        p = strtok(buf, delim);        if (p == NULL)            continue;        printf("%s\n", p);        while ((p = strtok(NULL, delim)) != NULL)            printf("%s\n", p);    }    fclose(fp);    return 0;}