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#include "fmt.h"
/* "foo" -> "foo "
* append padlen-srclen spaces after dest, if that is >= 0. Truncate
* only if total length is larger than maxlen. Return number of
* characters written. */
size_t fmt_fill(char* dest,size_t srclen,size_t padlen,size_t maxlen) {
long todo;
char* olddest=dest;
char* max=dest+maxlen;
if ((long)padlen<0 || (long)maxlen<0) return 0;
if (srclen>maxlen) return maxlen;
if (dest==0) {
unsigned long sum=srclen>padlen?srclen:padlen;
return sum>maxlen?maxlen:sum;
}
dest+=srclen;
for (todo=(long)(padlen-srclen); todo>0; --todo) {
if (dest>max) break;
*dest=' '; ++dest;
}
return (size_t)(dest-olddest);
}