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#include "fmt.h"
/* "foo" -> " foo"
* write padlen-srclen spaces, if that is >= 0. Then copy srclen
* characters from src. Truncate only if total length is larger than
* maxlen. Return number of characters written. */
unsigned int fmt_pad(char* dest,const char* src,unsigned int srclen,unsigned int padlen,unsigned int maxlen) {
int todo;
char* olddest=dest;
char* max=dest+maxlen;
if (dest==0) {
int sum=srclen>padlen?srclen:padlen;
return sum>maxlen?maxlen:sum;
for (; todo>0; --todo) {
if (dest>max) break;
*dest=' '; ++dest;
for (todo=srclen; todo>0; --todo) {
if (dest>max) break;
*dest=*src; ++dest; ++src;
return dest-olddest;