linux c 读取文件行数

linux c 读取文件行数参照wc 系统命令编写的函数如下：
#include <fcntl.h>
#include <stdlib.h>
#define MAXBSIZE 65536
u_long file_wc(char *file)
{
register u_char *p;
register short gotsp;
register int ch, len;
register u_long linect, charct;
int fd;
u_char buf[MAXBSIZE];
if (file) {
if ((fd = open(file, O_RDONLY, 0)) < 0)
return -1;
for (gotsp = 1; len = read(fd, buf, MAXBSIZE);) {
if (len == -1)
return -1;
charct += len;
for (p = buf; len--;) {
ch = *p++;
if (ch == '\n')
++linect;
if (isspace(ch))
gotsp = 1;
else if (gotsp) {
gotsp = 0;
}
}
}
}
return linect;
}
测试c
#include <stdlib.h>
int main(int argc,char *argv[])
{
u_long row;
row= file_wc("test.unl");
printf("%d\n",row);
return 0;
}