1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 /* 24 * Glenn Fowler 25 * AT&T Research 26 * 27 * return number n scaled to metric multiples of k { 1000 1024 } 28 * return string length is at most 5 chars + terminating nul 29 */ 30 31 #include <ast.h> 32 #include <lclib.h> 33 34 char* 35 fmtscale(register Sfulong_t n, int k) 36 { 37 register Sfulong_t m; 38 int r; 39 int z; 40 const char* u; 41 char suf[3]; 42 char* s; 43 char* buf; 44 Lc_numeric_t* p = (Lc_numeric_t*)LCINFO(AST_LC_NUMERIC)->data; 45 46 static const char scale[] = "bkMGTPE"; 47 48 u = scale; 49 if (n < 1000) 50 r = 0; 51 else 52 { 53 m = 0; 54 while (n >= k && *(u + 1)) 55 { 56 m = n; 57 n /= k; 58 u++; 59 } 60 if ((r = (10 * (m % k) + (k / 2)) / k) > 9) 61 { 62 r = 0; 63 n++; 64 } 65 if (k == 1024 && n >= 1000) 66 { 67 n = 1; 68 r = 0; 69 u++; 70 } 71 } 72 buf = fmtbuf(z = 8); 73 s = suf; 74 if (u > scale) 75 { 76 if (k == 1024) 77 { 78 *s++ = *u == 'k' ? 'K' : *u; 79 *s++ = 'i'; 80 } 81 else 82 *s++ = *u; 83 } 84 *s = 0; 85 if (n > 0 && n < 10) 86 sfsprintf(buf, z, "%I*u%c%d%s", sizeof(n), n, p->decimal >= 0 ? p->decimal : '.', r, suf); 87 else 88 { 89 if (r >= 5) 90 n++; 91 sfsprintf(buf, z, "%I*u%s", sizeof(n), n, suf); 92 } 93 return buf; 94 } 95