Inserting a character in the middle of a string

This is a discussion on Inserting a character in the middle of a string within the C Programming forums, part of the General Programming Boards category; I would like to insert a * in the middle of the sentence so that the output will be like ...

  1. #1
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    Inserting a character in the middle of a string

    I would like to insert a * in the middle of the sentence so that the output will be like '---*|abc'.
    I had code it out but the output doesnt seems like the one i wanted.

    It produce this output ddd---*|abc instead of just ---*|abc . I would like to know which part of the code went wrong or is there any other easier way that i can code to archieve the same objective ??

    Code:
    main(int argc,  char *argv[])
    {
    
    	int c;
    	int i=0;
    	char sentence[] = "---|abc";
    
                    textFormatting(sentence);
    
    
    
    }
    
    void textFormatting(char *garbage)
    {
    
    int j,i;
    int count;
    char temp;
    
    count = strlen(garbage);
    
    
    	for(j=0 ; j < count; j++)
    	{
    		if(*garbage != '-') // j = 3
    		{
    		garbage--;
    
    		if(*garbage == '-')
    		{
    	                        garbage++;
    			for(i = j ; i < count; i++)
    			{
    			garbage++;
    			}
    			
    
    			for(i = j ; i < count + 1 ; i++)
    			{
    			temp = *garbage;
    			garbage++;
    		                *garbage = temp;
    			garbage--;
    			garbage--;				if( i == count)
    		{
    		garbage++;
    		*garbage = '*';
    		}
    	}
    						
    	}
    	}
    	garbage++;
    
    
    	}
    
    for(i=0 ; i < count ; i++)
    {
    garbage--;
    
    }
    printf("%s\n", garbage);
    
    }

  2. #2
    and the hat of int overfl Salem's Avatar
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    > char sentence[] = "---|abc";
    Well you can't insert anything into this string, since it is already full.

    It's generally easiest to use two strings
    char sentence[] = "---|abc";
    char new[100];
    textFormatting(sentence,new,sizeof new);

    Within textFormatting(), you can use things like strncpy(), strcpy(), strcat() to move bits of strings from one to the other.

    I think this does it
    Code:
    char *p = strchr( src, '|' );
    int len = p - src;
    strncpy( dst, p, len );
    dst[len] = '\0';
    strcat( dst, "*" );
    strcat( dst, p );
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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