Ex_3.3_expand.c

/* expand: expand short hand notation in s1 into string s2. */

#include<stdio.h>
#define MAXLINE 100

int mgetline(char s[],int maxlimit);
void expand(char s1[],char s2[]);

int main(void)
{
	char s1[MAXLINE],s2[MAXLINE];

	mgetline(s1,MAXLINE);

	expand(s1,s2);

	printf("%s",s2);

	return 0;
}

int mgetline(char s[],int lim)
{
	int i,c;

	for(i=0;i<lim-1 && (c=getchar())!=EOF && c!='\n';++i)
		s[i]=c;

	if(c=='\n')
		s[i++]=c;
	
	s[i]='\0';
}

void expand(char s1[],char s2[])
{
	int i,j,c;

	i=j=0;

	while((c=s1[i++]) != '\0')
		if(s1[i]=='-' && s1[i+1] >=c)
		{
			i++;
			while(c<s1[i])
			s2[j++]=c++;
		}
		else
			s2[j++]=c;

	s2[j]='\0';
}