tolower (static pointer + malloc + realloc) Post: 302388892

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Top Forums Programming tolower (static pointer + malloc + realloc) Post 302388892 by limmer on Thursday 21st of January 2010 07:46:01 PM

01-21-2010

Registered User

tolower (static pointer + malloc + realloc)

N00B here. This function would be easier using a char pointer along with free. But I wish to learn how to use char static pointers (they do not require free, right ?).

How do I erase the content of a static pointer ? Terminating the string works but the static pointer's content is not being erased, right ? Why is realloc not working like I want it to ?

PHP Code:


char *STRINGtoLOWERCASE(const char *IN) // converts all chars in string to lower case (will not work on non-ASCII chars) 
{
    static char *OUTPUT = NULL;
    if(OUTPUT == NULL)
    {
        OUTPUT = (char *)malloc(sizeof(IN));
    }else{
        OUTPUT[0] = '\0'; // Why will this not erase the string ???
        OUTPUT = (char *)realloc(OUTPUT, sizeof(IN));
    }
 
    int COUNT = 0; 
    while(IN[COUNT]) 
    { 
        OUTPUT[COUNT] = (char)(tolower(IN[COUNT])); // need to cast to (char) or it will return the ASCII value no the char value 
        COUNT++; 
    }

    // OUTPUT[COUNT] = '\0'; // Commenting this shows that OUTPUT is not being erased !
 
    return OUTPUT; 
}

int main(void)
{
// OUTPUT is not being erased...
puts(STRINGtoLOWERCASE("HeLlO WoRlD")); // hello world��
puts(STRINGtoLOWERCASE("HeLlO")); // hello world��
puts(STRINGtoLOWERCASE("HeLlO WoRlD"));// hello world��
    return 0;
}

limmer

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