Inserção de string em outra string
// Insert q char c in pos n of the string str.
int strinsert(char **str, char c, int n, int q)
{
int len = my_strlen(*str);
char ins[q + 1];
char *new = malloc(len + q + 1);
memset(ins, c, q);
memset(new, 0, len + q);
ins[q] = '\0';
strncpy(new, *str, n);
new[n] = '\0';
strcat(new, ins);
strcat(new, *str + n);
return (0);
}
strinsert(&str, 'X', strlen(str) / 2, 5);
// Inserting in string str 5 'X' in the middle of the string
Grumpy Gentoo