C 語言字符串分割函數

strtok() 函數實現字符串分割

實例代碼：

#include <stdio.h>
#include <string.h>
int main(int argc, char ** argv)
{
	char test[] = "hello world c!!";
	char ch[] = " ";
	char * ptr = strtok(test, ch); // 實現字符串的分割
	while(ptr != NULL) 
	{		
		printf("%s\n", ptr);
		ptr = strtok(NULL, ch); 
	}
	
	return 0;
}

例子：

int is_comment(char * content)
{
	int i = 0;
	int len = strlen(content);
	while(i < len && isspace(content[i]) != 0)
	{
		++i;
	}
	if(i >= len || content[i] == '#') // empty line or comment line
		return 0;
	else
		return 1;
}


int open(FILE ** f)
{
	char *filename = "key.conf";
	if((*f = fopen(filename, "rw")) == NULL)
	{
		// no such file
		return ENOENT;
	}
	else
	{
		return 0;
	}
}

int close(FILE **f)
{
	return fclose(*f);
}


int read_id(FILE *f)
{
	char content[MAX_LENGTH];
	char *id = NULL;
	while(!feof(f))
	{
		fgets(content, MAX_LENGTH, f);
		content[strlen(content) - 2] ='\0';
		if(0 != is_comment(content))
		{
			id = strtok(content, " ");
			if(id != NULL)
			{
				printf("%s\n", id);
			}
			else
				return -1;			
		}
	}
	return 0;
}

int read_key(FILE *f)
{	
	char content[MAX_LENGTH];
	char *key;
	while(!feof(f))
	{
		fgets(content, MAX_LENGTH, f);
		content[strlen(content) - 2] ='\0';
		if(0 != is_comment(content))
		{
			key = strtok(content, " ");
			if(key != NULL)
			{
				key = strtok(NULL, " ");
				if(key != NULL)
				{
					printf("%s\n", key);
				}
				else
					return -1;
			}
			else
				return -1;
		}
	}
	return 0;
}

int read_uuid(FILE *f)
{
	char content[MAX_LENGTH];
	char *uuid;
	while(!feof(f))
	{
		fgets(content, MAX_LENGTH, f);
		content[strlen(content) - 2] ='\0';
		if(0 != is_comment(content))
		{
			uuid = strtok(content, " ");
			if(uuid != NULL)
			{
				uuid = strtok(NULL, " ");
				if(uuid != NULL)
				{
					uuid = strtok(NULL, " ");
					if(uuid != NULL)
					{
						printf("%s\n", uuid);
					}				
				}
				else
					return -1;
			}
			else
				return -1;
		}
	}
	return 0;
}

int main(int argc, char ** argv)
{
	FILE *f = NULL;
	open(&f);

	//printf("space = %d\n", isspace(' '));	
	read_id(f);
	fseek(f,0,0);
	read_key(f);
	fseek(f,0,0);
	read_uuid(f);	
	
	close(&f);
	
	return 0;
}

key.conf結構：

## comment: start with '#'


## style: plain text


## format: <unique-identifier> <encrypted-key> [uuid,...]


## uuid has upper limit for one key, the upper limit is 10




10000001 asdfgh123456i719 550E8400-E29B-11D4-A716-446655440000


10000002 asdfgh123456i710 


10000003 asdfgh123456i711 550E8400-E29B-11D4-A716-44665544asdf
10000004 asdfgh123456i712
10000005 asdfgh123456i713 550E8400-E29B-11D4-A716-44665544asdf,550E8400-E29B-11D4-A716-446655440987


# end