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    revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC revision 984 by niro, Sun May 30 11:32:42 2010 UTC
    # Line 24  Line 24 
    24   *   *
    25   *      Some code to omit the decimal point and tenths digit is sketched out   *      Some code to omit the decimal point and tenths digit is sketched out
    26   *      and "#if 0"'d below.   *      and "#if 0"'d below.
    27     *
    28     * Licensed under GPLv2, see file LICENSE in this tarball for details.
    29   */   */
    30    
    31  #include "libbb.h"  #include "libbb.h"
    32    
    33  const char* FAST_FUNC make_human_readable_str(unsigned long long size,  const char* FAST_FUNC make_human_readable_str(unsigned long long val,
    34   unsigned long block_size, unsigned long display_unit)   unsigned long block_size, unsigned long display_unit)
    35  {  {
      /* The code will adjust for additional (appended) units */  
    36   static const char unit_chars[] ALIGN1 = {   static const char unit_chars[] ALIGN1 = {
    37   '\0', 'K', 'M', 'G', 'T', 'P', 'E'   '\0', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'
    38   };   };
      static const char fmt[] ALIGN1 = "%llu";  
      static const char fmt_tenths[] ALIGN1 = "%llu.%d%c";  
    39    
    40   static char str[21] ALIGN1;  /* Sufficient for 64 bit unsigned integers */   static char *str;
    41    
    42   unsigned long long val;   unsigned frac; /* 0..9 - the fractional digit */
      int frac;  
    43   const char *u;   const char *u;
    44   const char *f;   const char *fmt;
      smallint no_tenths;  
    45    
    46   if (size == 0)   if (val == 0)
    47   return "0";   return "0";
    48    
    49   /* If block_size is 0 then do not print tenths */   fmt = "%llu";
    50   no_tenths = 0;   if (block_size > 1)
    51   if (block_size == 0) {   val *= block_size;
      no_tenths = 1;  
      block_size = 1;  
      }  
       
      u = unit_chars;  
      val = size * block_size;  
      f = fmt;  
    52   frac = 0;   frac = 0;
    53     u = unit_chars;
    54    
    55   if (display_unit) {   if (display_unit) {
    56   val += display_unit/2; /* Deal with rounding */   val += display_unit/2; /* Deal with rounding */
    57   val /= display_unit; /* Don't combine with the line above!!! */   val /= display_unit; /* Don't combine with the line above! */
    58   /* will just print it as ulonglong (below) */   /* will just print it as ulonglong (below) */
    59   } else {   } else {
    60   while ((val >= 1024)   while ((val >= 1024)
    61   && (u < unit_chars + sizeof(unit_chars) - 1)   /* && (u < unit_chars + sizeof(unit_chars) - 1) - always true */
    62   ) {   ) {
    63   f = fmt_tenths;   fmt = "%llu.%u%c";
    64   u++;   u++;
    65   frac = (((int)(val % 1024)) * 10 + 1024/2) / 1024;   frac = (((unsigned)val % 1024) * 10 + 1024/2) / 1024;
    66   val /= 1024;   val /= 1024;
    67   }   }
    68   if (frac >= 10) { /* We need to round up here. */   if (frac >= 10) { /* we need to round up here */
    69   ++val;   ++val;
    70   frac = 0;   frac = 0;
    71   }   }
    72  #if 1  #if 1
    73   /* Sample code to omit decimal point and tenths digit. */   /* If block_size is 0, dont print fractional part */
    74   if (no_tenths) {   if (block_size == 0) {
    75   if (frac >= 5) {   if (frac >= 5) {
    76   ++val;   ++val;
    77   }   }
    78   f = "%llu%*c" /* fmt_no_tenths */;   fmt = "%llu%*c";
    79   frac = 1;   frac = 1;
    80   }   }
    81  #endif  #endif
    82   }   }
    83    
    84   /* If f==fmt then 'frac' and 'u' are ignored. */   if (!str) {
    85   snprintf(str, sizeof(str), f, val, frac, *u);   /* sufficient for any width of val */
    86     str = xmalloc(sizeof(val)*3 + 2 + 3);
    87     }
    88     sprintf(str, fmt, val, frac, *u);
    89   return str;   return str;
    90  }  }
    91    
    92    
    93    /* vda's implementations of the similar idea */
    94    
    95    /* Convert unsigned long long value into compact 5-char representation.
    96     * String is not terminated (buf[5] is untouched) */
    97    void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
    98    {
    99     const char *fmt;
    100     char c;
    101     unsigned v, u, idx = 0;
    102    
    103     if (ul > 99999) { // do not scale if 99999 or less
    104     ul *= 10;
    105     do {
    106     ul /= 1024;
    107     idx++;
    108     } while (ul >= 100000);
    109     }
    110     v = ul; // ullong divisions are expensive, avoid them
    111    
    112     fmt = " 123456789";
    113     u = v / 10;
    114     v = v % 10;
    115     if (!idx) {
    116     // 99999 or less: use "12345" format
    117     // u is value/10, v is last digit
    118     c = buf[0] = " 123456789"[u/1000];
    119     if (c != ' ') fmt = "0123456789";
    120     c = buf[1] = fmt[u/100%10];
    121     if (c != ' ') fmt = "0123456789";
    122     c = buf[2] = fmt[u/10%10];
    123     if (c != ' ') fmt = "0123456789";
    124     buf[3] = fmt[u%10];
    125     buf[4] = "0123456789"[v];
    126     } else {
    127     // value has been scaled into 0..9999.9 range
    128     // u is value, v is 1/10ths (allows for 92.1M format)
    129     if (u >= 100) {
    130     // value is >= 100: use "1234M', " 123M" formats
    131     c = buf[0] = " 123456789"[u/1000];
    132     if (c != ' ') fmt = "0123456789";
    133     c = buf[1] = fmt[u/100%10];
    134     if (c != ' ') fmt = "0123456789";
    135     v = u % 10;
    136     u = u / 10;
    137     buf[2] = fmt[u%10];
    138     } else {
    139     // value is < 100: use "92.1M" format
    140     c = buf[0] = " 123456789"[u/10];
    141     if (c != ' ') fmt = "0123456789";
    142     buf[1] = fmt[u%10];
    143     buf[2] = '.';
    144     }
    145     buf[3] = "0123456789"[v];
    146     buf[4] = scale[idx]; /* typically scale = " kmgt..." */
    147     }
    148    }
    149    
    150    /* Convert unsigned long long value into compact 4-char
    151     * representation. Examples: "1234", "1.2k", " 27M", "123T"
    152     * String is not terminated (buf[4] is untouched) */
    153    void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
    154    {
    155     const char *fmt;
    156     char c;
    157     unsigned v, u, idx = 0;
    158    
    159     if (ul > 9999) { // do not scale if 9999 or less
    160     ul *= 10;
    161     do {
    162     ul /= 1024;
    163     idx++;
    164     } while (ul >= 10000);
    165     }
    166     v = ul; // ullong divisions are expensive, avoid them
    167    
    168     fmt = " 123456789";
    169     u = v / 10;
    170     v = v % 10;
    171     if (!idx) {
    172     // 9999 or less: use "1234" format
    173     // u is value/10, v is last digit
    174     c = buf[0] = " 123456789"[u/100];
    175     if (c != ' ') fmt = "0123456789";
    176     c = buf[1] = fmt[u/10%10];
    177     if (c != ' ') fmt = "0123456789";
    178     buf[2] = fmt[u%10];
    179     buf[3] = "0123456789"[v];
    180     } else {
    181     // u is value, v is 1/10ths (allows for 9.2M format)
    182     if (u >= 10) {
    183     // value is >= 10: use "123M', " 12M" formats
    184     c = buf[0] = " 123456789"[u/100];
    185     if (c != ' ') fmt = "0123456789";
    186     v = u % 10;
    187     u = u / 10;
    188     buf[1] = fmt[u%10];
    189     } else {
    190     // value is < 10: use "9.2M" format
    191     buf[0] = "0123456789"[u];
    192     buf[1] = '.';
    193     }
    194     buf[2] = "0123456789"[v];
    195     buf[3] = scale[idx]; /* typically scale = " kmgt..." */
    196     }
    197    }
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