isalpha || ispunct

[linuxdude]

I am writing a program to see if the next character that isn't a \n \t or ' ' is a punctuation or a letter. I have this function but i get a seg fault. Does isalpha or ispunct mess with memory somehow or something??

int search_for_word(char *string,int offset){
        offset=0; /*just for this example*/
        while((!isalpha(string[offset])) || ((!ispunct(string[offset])))){
                offset++;
        }
        printf("X == %d\n",offset);
        if((isalpha(string[offset]))){
             return 1;
        }
        else{
        return 0;
}
        return 1;
}

[swoopy]

>Does isalpha or ispunct mess with memory somehow or something??
It certainly does if you let it.

> while((!isalpha(string[offset])) || ((!ispunct(string[offset])))){

Use &&:
while((!isalpha(string[offset])) && ((!ispunct(string[offset])))){

[Thantos]

isalpha and ispunct do not mess with the actual memory themselves. The information is passed by as an integer so it just a value. Use and instead of or like swoopy said but you might want to include a way to see if you hit the null character so if you do you can stop and avoid going outside of your array

[linuxdude]

Oh I did that was just an example I wrote real quickly. It is in my real code. the seg fault stopped when I changed || to &&