X-Git-Url: https://arthur.barton.de/gitweb/?a=blobdiff_plain;f=src%2Fstorage_number.c;h=27fe5f2c722a20a62b0e0dcd45d19c48eb632840;hb=2471055410a7386a8e503b9a72a13c4117c8690b;hp=dbbf7be32908a302dc65b8468884262e748d9537;hpb=037bbc245f57e45f9e6f56c705957e38586d7218;p=netdata.git diff --git a/src/storage_number.c b/src/storage_number.c old mode 100755 new mode 100644 index dbbf7be3..27fe5f2c --- a/src/storage_number.c +++ b/src/storage_number.c @@ -1,85 +1,168 @@ +#include "common.h" -#include "log.h" -#include "storage_number.h" +extern char *print_number_lu_r(char *str, unsigned long uvalue); +extern char *print_number_llu_r(char *str, unsigned long long uvalue); -storage_number pack_storage_number(calculated_number value) +storage_number pack_storage_number(calculated_number value, uint32_t flags) { - storage_number r = 0; - if(!value) return r; - - // bit 32 = sign - // bit 31 = 0:divide, 1:multiply - // bit 30, 29, 28 = (multiplier or divider) 0-7 - // bit 27 to 25 = reserved for flags - // bit 24 to bit 1 = the value - - storage_number sign = 0, exp = 0, mul; - int m = 0; - calculated_number n = value; - - if(n < 0) { - sign = 1; - n = -n; - } - - while(m < 7 && n > (calculated_number)0x00ffffff) { - n /= 10; - m++; - } - while(m > -7 && n < (calculated_number)0x00199999) { - n *= 10; - m--; - } - - if(m <= 0) { - exp = 0; - m = -m; - } - else exp = 1; - - if(n > (calculated_number)0x00ffffff) { - error("Number " CALCULATED_NUMBER_FORMAT " is too big.", value); - n = (calculated_number)0x00ffffff; - } - - mul = m; - - r = (sign << 31) + (exp << 30) + (mul << 27) + n; - // fprintf(stderr, "PACK: %08X, sign = %d, exp = %d, mul = %d, n = " CALCULATED_NUMBER_FORMAT "\n", r, sign, exp, mul, n); - - return r; + // bit 32 = sign 0:positive, 1:negative + // bit 31 = 0:divide, 1:multiply + // bit 30, 29, 28 = (multiplier or divider) 0-6 (7 total) + // bit 27, 26, 25 flags + // bit 24 to bit 1 = the value + + storage_number r = get_storage_number_flags(flags); + if(!value) return r; + + int m = 0; + calculated_number n = value; + + // if the value is negative + // add the sign bit and make it positive + if(n < 0) { + r += (1 << 31); // the sign bit 32 + n = -n; + } + + // make its integer part fit in 0x00ffffff + // by dividing it by 10 up to 7 times + // and increasing the multiplier + while(m < 7 && n > (calculated_number)0x00ffffff) { + n /= 10; + m++; + } + + if(m) { + // the value was too big and we divided it + // so we add a multiplier to unpack it + r += (1 << 30) + (m << 27); // the multiplier m + + if(n > (calculated_number)0x00ffffff) { + error("Number " CALCULATED_NUMBER_FORMAT " is too big.", value); + r += 0x00ffffff; + return r; + } + } + else { + // 0x0019999e is the number that can be multiplied + // by 10 to give 0x00ffffff + // while the value is below 0x0019999e we can + // multiply it by 10, up to 7 times, increasing + // the multiplier + while(m < 7 && n < (calculated_number)0x0019999e) { + n *= 10; + m++; + } + + // the value was small enough and we multiplied it + // so we add a divider to unpack it + r += (0 << 30) + (m << 27); // the divider m + } + +#ifdef STORAGE_WITH_MATH + // without this there are rounding problems + // example: 0.9 becomes 0.89 + r += lrint((double) n); +#else + r += (storage_number)n; +#endif + + return r; } calculated_number unpack_storage_number(storage_number value) { - if(!value) return 0; + if(!value) return 0; - int sign = 0; - int exp = 0; + int sign = 0, exp = 0; - if(value & (1 << 31)) { - sign = 1; - value ^= 1 << 31; - } + value ^= get_storage_number_flags(value); - if(value & (1 << 30)) { - exp = 1; - value ^= 1 << 30; - } + if(value & (1 << 31)) { + sign = 1; + value ^= 1 << 31; + } - int mul = value >> 27; - value ^= mul << 27; + if(value & (1 << 30)) { + exp = 1; + value ^= 1 << 30; + } - calculated_number n = value; + int mul = value >> 27; + value ^= mul << 27; - // fprintf(stderr, "UNPACK: %08X, sign = %d, exp = %d, mul = %d, n = " CALCULATED_NUMBER_FORMAT "\n", value, sign, exp, mul, n); + calculated_number n = value; - while(mul > 0) { - if(exp) n *= 10; - else n /= 10; - mul--; - } + // fprintf(stderr, "UNPACK: %08X, sign = %d, exp = %d, mul = %d, n = " CALCULATED_NUMBER_FORMAT "\n", value, sign, exp, mul, n); - if(sign) n = -n; - return n; + while(mul > 0) { + if(exp) n *= 10; + else n /= 10; + mul--; + } + + if(sign) n = -n; + return n; +} + +int print_calculated_number(char *str, calculated_number value) +{ + char *wstr = str; + + int sign = (value < 0) ? 1 : 0; + if(sign) value = -value; + +#ifdef STORAGE_WITH_MATH + // without llrint() there are rounding problems + // for example 0.9 becomes 0.89 + unsigned long long uvalue = (unsigned long long int) llrint(value * (calculated_number)100000); +#else + unsigned long long uvalue = value * (calculated_number)100000; +#endif + +#ifdef ENVIRONMENT32 + if(uvalue > (unsigned long long)0xffffffff) + wstr = print_number_llu_r(str, uvalue); + else + wstr = print_number_lu_r(str, uvalue); +#else + do *wstr++ = (char)('0' + (uvalue % 10)); while(uvalue /= 10); +#endif + + // make sure we have 6 bytes at least + while((wstr - str) < 6) *wstr++ = '0'; + + // put the sign back + if(sign) *wstr++ = '-'; + + // reverse it + char *begin = str, *end = --wstr, aux; + while (end > begin) aux = *end, *end-- = *begin, *begin++ = aux; + // wstr--; + // strreverse(str, wstr); + + // remove trailing zeros + int decimal = 5; + while(decimal > 0 && *wstr == '0') { + *wstr-- = '\0'; + decimal--; + } + + // terminate it, one position to the right + // to let space for a dot + wstr[2] = '\0'; + + // make space for the dot + int i; + for(i = 0; i < decimal ;i++) { + wstr[1] = wstr[0]; + wstr--; + } + + // put the dot + if(wstr[2] == '\0') { wstr[1] = '\0'; decimal--; } + else wstr[1] = '.'; + + // return the buffer length + return (int) ((wstr - str) + 2 + decimal ); }