do_wc.h

linuxunix 下的c语言实现

void do_wc(char *para, char *fname){
	if(para==NULL || fname==NULL ){
		printf("WARNING: Paraemeter[-c/-l] and File Name are compulsory. Please use 'help' command to lookout.\n");
		return;
	}
	
	unsigned long int c=0;      // counters of bytes or lines
	/* -c */
	if(!(strcmp(para,"-c"))){
		FILE *fp;

		fp=fopen(fname, "r");

		if(fp == NULL){
			perror("ERROR: occurs when open file\n");
			return;
		}
		while(fgetc(fp)!=EOF){
			c++;
		}
		printf("%s chars(bytes): %d\n", fname, c);
		fclose(fp);
		return;
	}
	/*  -l  */
	if(!(strcmp(para,"-l"))){
		FILE *fp;
		char line[128];

		fp=fopen(fname, "r");

		if(fp == NULL){
			perror("ERROR: occurs when open file\n");
			return;
		}
		while (fgets(line, 128, fp) != NULL){ 
			c++;
		}
		printf("%s lines: %d\n", fname, c);
		fclose(fp);
		return;
	}
	else
		printf("Error: invalid parameter!\n");

}