Question

I have a char array in a C application that I have to split into parts of 250 so that I can send it along to another application that doesn’t accept more at one time.

How would I do that? Platform: win32.

Answer 1

From the MSDN documentation:

The strncpy function copies the initial count characters of strSource to strDest and returns strDest. If count is less than or equal to the length of strSource, a null character is not appended automatically to the copied string. If count is greater than the length of strSource, the destination string is padded with null characters up to length count. The behavior of strncpy is undefined if the source and destination strings overlap.

Note that strncpy doesn’t check for valid destination space; that is left to the programmer. Prototype:

char *strncpy( char *strDest, const char *strSource, size_t count );

Extended example:

void send250(char *inMsg, int msgLen) {     char block[250];     while (msgLen > 0)     {          int len = (msgLen>250) ? 250 : msgLen;          strncpy(block, inMsg, 250);           // send block to other entity           msgLen -= len;          inMsg  += len;     } }