sprintf and snprintf question in C

rn2388 · #1 16-Jun-2004, 15:49

Hi,

My C library doesn't have the snprintf function built in.

I would like to know how to change the following code from
snprintf to sprintf.

int len =strlen(book->name);
snprintf(book->name + len, sizeof(book->name) -len -1, "%s", book->id);

Any help would be appreciated.

rn2388

dsmith · #2 16-Jun-2004, 16:11

Quote:

Originally Posted by rn2388

Hi,

My C library doesn't have the snprintf function built in.

I would like to know how to change the following code from
snprintf to sprintf.

int len =strlen(book->name);
snprintf(book->name + len, sizeof(book->name) -len -1, "%s", book->id);

Any help would be appreciated.

rn2388

Hello rn2388. Welcome to GIDForums.

You should be able to replicate this using a quick strcpy and a properly placed null.

CPP / C++ / C Code:

char* temp = (char*) malloc(strlen(book->id);
int len =strlen(book->name);

strcpy(temp,book->id);
*(temp+sizeof(book->name) - len -1) = 0;
sprintf(book->name + len, "%s", temp);

That being said, I am lost in what this is doing. I see no instance in which sizeof(book->name) - len -1 is going to result in a positive number. What am I missing?

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