copy.c

unix环境下实现的cmm语言编译器

int printf(char *msg);
void *fopen(char *file, char *mode);
char *fgets(char *buf, int n, void *file);
int	fputs(char *buf, void *file);
int ferror(void *file);
int fclose(void *file);
int main(int argc, char *argv[])
{
	char buf[1024];
	void *src, *dst;
	if (argc != 3) {
		printf("usage: copy src dst\n");
		return 1;
	}
	if ((src = fopen(argv[1], "r")) == (void *)0) {
		printf("open source file fail\n");
		return 1;
	}
	if ((dst = fopen(argv[2], "w")) == (void *)0) {
		printf("open destination file fail\n");
		return 1;
	}
	
	while (fgets(buf, sizeof buf, src))
		fputs(buf, dst);
	if (ferror(src))
		printf("copy fail\n");
	fclose(src);
	fclose(dst);
	return 0;
}