ref: 0251f35ae8cca55743aea9b708a07e128901327f
dir: /3rd/mp/mptobe.c/
#include "platform.h" // convert an mpint into a big endian byte array (most significant byte first; left adjusted) // return number of bytes converted // if p == nil, allocate and result array int mptobe(mpint *b, uchar *p, uint n, uchar **pp) { uint m; m = (mpsignif(b)+7)/8; if(m == 0) m++; if(p == nil){ n = m; p = malloc(n); if(p == nil) sysfatal("mptobe: %r"); } else { if(n < m) return -1; if(n > m) memset(p+m, 0, n-m); } if(pp != nil) *pp = p; mptober(b, p, m); return m; }