forked from KolibriOS/kolibrios
553 lines
17 KiB
C
553 lines
17 KiB
C
/*
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function for format output to the string
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Siemargl update formats as http://www.cplusplus.com/reference/cstdio/printf/, no wchar though
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http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap05.html is used too
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%g explain https://support.microsoft.com/en-us/kb/43392
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todo:
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-%e
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-simplify justifying
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-fix %o, %x
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-fix precision in %g
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-%a
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-NAN, INF
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-%n nothing printed
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-%17.18f digits maximum format
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%C as w_char L'x'
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*/
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//#include <kolibrisys.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <math.h>
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#include <stdarg.h>
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enum flags_t
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{
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flag_unsigned = 0x02,
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flag_register = 0x04,
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flag_plus = 0x08,
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flag_left_just = 0x10,
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flag_lead_zeros = 0x20,
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flag_space_plus = 0x40,
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flag_hash_sign = 0x80,
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flag_point = 0x100
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};
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int formatted_double_to_string_scientific(long double number, int format1, int format2, char *s, int flags)
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{
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strcpy(s, "%e not implemented yet, sorry");
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return strlen(s);
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}
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int formatted_double_to_string(long double number, int format1, int format2, char *s, int flags)
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{
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long double nafter, beforpointdigit;
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long long intdigit, mul;
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int div;
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int i;
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char* size;
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int fmt1;
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int fmt2;
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char buf[100], *pbuf = buf;
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char buf_low[50], *pbuf_lo = buf_low;
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if((flags & flag_point) == 0) format2 = 6; // default prec if no point spec
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size = s;
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if (number < 0) {*s++ = '-'; number = -number; }
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else
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{
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if (flags & flag_plus) *s++ = '+'; else
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if (flags & flag_space_plus) *s++ = ' ';
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}
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fmt1 = 1;
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fmt2 = format2;
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if (fmt2 > 18) fmt2 = 18; //maximum size of long long type
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beforpointdigit = floor(number + 0.00000000000001);
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nafter = number - beforpointdigit;
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//print part of number before point
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mul = 1;
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for(i = 0; i < sizeof buf - 1; i++)
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{
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mul *= 10;
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if ((beforpointdigit/mul) < 1.0) { fmt1 = i + 1; break; }
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}
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if (i == sizeof buf - 1 || fmt1 > 17)
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{
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strcpy(s, "[too big number for %f, %a]");
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return strlen(s);
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}
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mul /= 10;
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while(mul > 1)
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{
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div = beforpointdigit / mul;
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*pbuf++ = (char)div + '0';
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beforpointdigit = beforpointdigit - div * mul;
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mul /= 10;
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}
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*pbuf++=(char)beforpointdigit + '0';
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//print part of number after point
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mul = 1;
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for(i = 0; i < fmt2; i++)
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{
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nafter = nafter*10;
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mul *= 10;
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}
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intdigit = roundl(nafter);
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mul /= 10;
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for(i = 0; i < fmt2 - 1; i++)
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{
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div = intdigit / mul;
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*pbuf_lo++=(char)div + '0';
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intdigit = intdigit - div * mul;
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mul /= 10;
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if (mul == 1) break;
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}
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*pbuf_lo++ = (char)intdigit + '0';
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memcpy(s, buf, pbuf - buf); s += pbuf - buf;
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if (roundl(nafter) != 0 || fmt2 != 0)
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{
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*s++ = '.';
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memcpy(s, buf_low, pbuf_lo - buf_low); s += pbuf_lo - buf_low;
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} else if (flags & flag_hash_sign)
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*s++ = '.';
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// right justifiyng and forward zeros
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div = (s - size);
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if ((flags & flag_left_just) == 0 && div < format1)
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{
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pbuf = size;
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if ((flags & flag_lead_zeros) != 0)
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if (*pbuf == '+' || *pbuf == '-' || *pbuf == ' ') { pbuf++; div--; } // sign already at place
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for (i = 0; i < div; i++)
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size[format1 - i - 1] = pbuf[div - 1 - i];
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for (i = 0; i < format1 - div - (pbuf - size); i++)
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if (flags & flag_lead_zeros)
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pbuf[i] = '0';
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else
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pbuf[i] = ' ';
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return format1;
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}
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return s - size;
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}
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int formatted_long_to_string(long long number, int format1, int prec, char *s, int flags)
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{
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int i;
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int fmt;
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char* size = s;
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long long digit;
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long long mul;
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int div;
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char buf[100], *pbuf = buf;
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if (number == -9223372036854775807LL - 1) // overflow all our math, cant minus this
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{
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strcpy(buf, "9223372036854775808");
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pbuf += 19;
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*s++ = '-';
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goto verybig;
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}
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if (flags & flag_point) flags &= ~flag_lead_zeros; // conflicting flags
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if (number < 0) {*s++ = '-'; number = -number; }
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else
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{
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if (flags & flag_plus) *s++ = '+'; else
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if (flags & flag_space_plus) *s++ = ' ';
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}
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digit = number;
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mul = (digit < 0) ? -1 : 1;
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for(i = 0; i < sizeof buf - 2; i++)
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{
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if (digit / mul < 10) { fmt = i + 1; break; }
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mul *= 10;
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}
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// add leading zeros
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for(i = 0; i < prec - fmt; i++) *pbuf++ = '0';
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for(i = 0; i < fmt - 1; i++)
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{
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div = digit / mul;
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*pbuf++ = (char)div + '0';
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digit = digit - div * mul;
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mul /= 10;
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if (mul == 1 || mul == -1) break;
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}
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*pbuf++ = (char)digit + '0';
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verybig:
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memcpy(s, buf, pbuf - buf); s += pbuf - buf;
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// right justifiyng and forward zeros
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div = (s - size);
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if ((flags & flag_left_just) == 0 && div < format1)
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{
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pbuf = size;
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if ((flags & flag_lead_zeros) != 0)
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if (*pbuf == '+' || *pbuf == '-' || *pbuf == ' ') { pbuf++; div--; } // sign already at place
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for (i = 0; i < div; i++)
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size[format1 - i - 1] = pbuf[div - 1 - i];
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for (i = 0; i < format1 - div - (pbuf - size); i++)
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if (flags & flag_lead_zeros)
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pbuf[i] = '0';
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else
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pbuf[i] = ' ';
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return format1;
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}
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return s - size;
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}
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int formatted_hex_to_string(long long number, int fmt1, char *s, int flags)
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{
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long n;
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int i,pos;
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// int fmt;
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long size;
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int difference_pos;
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char xdigs_lower[16]="0123456789abcdef";
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char xdigs_upper[16]="0123456789ABCDEF";
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char buf[200];
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n=(long)number;
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size=(int)s;
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if (n<0) {*s='-';s++;n=-n;}
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if (n==0) {*s='0';s++;goto end;}
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for(i=0;i<200;i++) {buf[i]=0;}
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i=0;
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if (flag_register==0)
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{
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while (n>0)
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{
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buf[i]=xdigs_lower[n & 15];
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n=n>>4;
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i++;
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}
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}
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else
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{
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while (n>0)
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{
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buf[i]=xdigs_upper[n & 15];
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n=n>>4;
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i++;
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}
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}
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pos=i;
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difference_pos=i;
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for(i=pos-1;i>=0;i--)
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{
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*s=buf[i];
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s++;
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}
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if (fmt1-difference_pos>0)
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{
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for(i=difference_pos+1;i<=fmt1;i++)
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{
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*s=' ';
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s++;
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}
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}
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end:size=(int)s-size;
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return(size);
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}
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int formatted_octa_to_string(long long number, int fmt1, char *s, int flags)
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{
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long n;
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int i,pos;
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// int fmt;
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long size;
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int difference_pos;
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char xdigs_lower[16]="012345678";
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char buf[200];
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n=number;
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size=(int)s;
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if (n<0) {*s='-';s++;n=-n;}
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if (n==0) {*s='0';s++;goto end;}
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for(i=0;i<200;i++) {buf[i]=0;}
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i=0;
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if (flag_register==0)
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{
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while (n>0)
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{
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buf[i]=xdigs_lower[n & 7];
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n=n>>3;
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i++;
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}
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}
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pos=i;
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difference_pos=i;
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for(i=pos-1;i>=0;i--)
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{
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*s=buf[i];
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s++;
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}
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if (fmt1-difference_pos>0)
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{
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for(i=difference_pos+1;i<=fmt1;i++)
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{
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*s=' ';
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s++;
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}
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}
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end:size=(int)s-size;
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return(size);
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}
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//int vsnprintf (char * s, size_t n, const char * format, va_list arg );
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int format_print(char *dest, size_t maxlen, const char *fmt0, va_list argp)
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{
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int i;
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int length;
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int fmt1, fmt2; // width, precision
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size_t pos, posc;
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long long intdigit;
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long double doubledigit;
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// float floatdigit;
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const char *fmt, *fmtc; // first point to %, fmtc points to specifier
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char *s; // pointer to current dest char
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char *str;
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char buf[200]; // buffer for current argument value print representation
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int format_flag;
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int flag_long; // 2 = long double or long long int or wchar
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int *point_to_n = NULL;
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int flags; // parsed flags
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fmt = fmt0;
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s = dest;
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pos = 0;
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while(pos < maxlen)
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{
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if (*fmt != '%') // usual char
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{
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if ('\0' == (*s++ = *fmt++)) break;
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pos++;
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continue;
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}
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if (*(fmt + 1) == '%') // %%
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{
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*s++ = '%'; pos++;
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fmt += 2;
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continue;
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}
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//checking to containg format in the string
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fmtc = fmt;
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posc = pos;
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flags = 0;
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format_flag = 0;
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flag_long = 0; // 2 = long double or long long int or wchar
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while(*fmtc != '\0' && !format_flag) // searching end of format
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{
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fmtc++; posc++;
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switch( *fmtc )
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{
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case 'a':
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format_flag = 1;
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flags |= flag_unsigned;
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break;
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case 'A':
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format_flag = 1;
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flags |= flag_unsigned | flag_register;
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break;
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case 'c': case 'd': case 'i': case 'e': case 'f': case 'g': case 's': case 'n':
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format_flag = 1;
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break;
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case 'E': case 'F': case 'G':
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format_flag = 1;
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flags |= flag_register;
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break;
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case 'l':
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flag_long = flag_long ? 2 : 1; // ll.eq.L
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break;
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case 'L':
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flag_long = 2;
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break;
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case 'o': case 'u': case 'x': case 'p':
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format_flag = 1;
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flags |= flag_unsigned;
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break;
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case 'X': case 'P':
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format_flag = 1;
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flags |= flag_unsigned | flag_register;
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break;
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case '+':
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flags |= flag_plus;
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break;
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case '-':
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flags |= flag_left_just;
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break;
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case ' ': // space
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flags |= flag_space_plus;
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break;
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case '#':
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flags |= flag_hash_sign;
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break;
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case '*': case '.': // just skip
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break;
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default:
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if(isdigit(*fmtc)) break;
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strncpy(dest, "print format error - in % invalid char found", maxlen);
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return -1; // non format char found - user error
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}
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}
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if (format_flag == 0)
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{
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strncpy(dest, "print format error - % without format specifier", maxlen);
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return -1; // format char not found - user error
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}
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fmt1 = 0;
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fmt2 = 0;
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if (posc - pos > 1) // try to read width, precision
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{
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fmt++;
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for(i = pos + 1; i < posc; i++)
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{
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switch(*fmt)
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{
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case '0':
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if(fmt1 == 0 && (flags & flag_point) == 0) flags |= flag_lead_zeros;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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if ((flags & flag_point) == 0)
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fmt1 = fmt1 * 10 + (*fmt -'0');
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else
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fmt2 = fmt2 * 10 + (*fmt -'0');
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break;
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case '*':
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if (flag_point == 0)
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fmt1 = va_arg(argp, int);
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else
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fmt2 = va_arg(argp, int);
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break;
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case '.':
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flags |= flag_point;
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break;
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case 'l': case 'L': case '+': // valid chars - skip
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case '-': case ' ': case '#':
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break;
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default: // must be error
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strncpy(dest, "print format error - %width.precision", maxlen);
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return -1; // format char not found - user error
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}
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fmt++;
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}
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}
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// do real work - format arguments values
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length = 0;
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switch(*fmtc)
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{
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case 'n':
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point_to_n = va_arg(argp, int*);
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break;
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case 'c':
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if (pos + 1 <= maxlen)
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{
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buf[0] = (char)va_arg(argp, int);
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length = 1;
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}
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break;
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case 's': // special case - without buf
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str = va_arg(argp, char*);
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length = strlen(str);
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if ((flags & flag_point) && (length > fmt2)) length = fmt2; // cut by precision
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if (pos + length > maxlen) length = maxlen - pos;
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memcpy(s, str ,length);
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s += length;
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pos += length;
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break;
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case 'd': case 'i': case 'u': case 'U':
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if (flag_long == 0) intdigit = va_arg(argp, int); else
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if (flag_long == 1) intdigit = va_arg(argp, long); else
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if (flag_long == 2) intdigit = va_arg(argp, long long);
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length = formatted_long_to_string(intdigit, fmt1, fmt2, buf, flags);
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break;
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case 'o':
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if (flag_long == 0) intdigit = va_arg(argp, int); else
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if (flag_long == 1) intdigit = va_arg(argp, long); else
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if (flag_long == 2) intdigit = va_arg(argp, long long);
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length = formatted_octa_to_string(intdigit, fmt1, buf, flags);
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break;
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case 'p': case 'P': case 'x': case 'X':
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if (flag_long == 0) intdigit = va_arg(argp, int); else
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if (flag_long == 1) intdigit = va_arg(argp, long); else
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if (flag_long == 2) intdigit = va_arg(argp, long long);
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length=formatted_hex_to_string(intdigit, fmt1, buf, flags);
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break;
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case 'a': case 'A': case 'f': case 'F':
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if (flag_long <= 1) doubledigit = va_arg(argp, double); else
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if (flag_long == 2) doubledigit = va_arg(argp, long double);
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length = formatted_double_to_string(doubledigit, fmt1, fmt2, buf, flags);
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break;
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case 'e': case 'E':
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if (flag_long <= 1) doubledigit = va_arg(argp, double); else
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if (flag_long == 2) doubledigit = va_arg(argp, long double);
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length = formatted_double_to_string_scientific(doubledigit, fmt1, fmt2, buf, flags);
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break;
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case 'g': case 'G':
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//prec special case, this is just workaround
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if (flag_long <= 1) doubledigit = va_arg(argp, double); else
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if (flag_long == 2) doubledigit = va_arg(argp, long double);
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length = formatted_double_to_string(doubledigit, fmt1, fmt2, buf, flags);
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i = formatted_double_to_string_scientific(doubledigit, fmt1, fmt2, buf + sizeof buf / 2, flags);
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if(length > i)
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{
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memcpy(buf, buf + sizeof buf / 2, i);
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length = i;
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|
}
|
|
break;
|
|
}
|
|
if (*fmtc != 's' && length > 0) // skip multiple string copying
|
|
{
|
|
if (pos + length > maxlen) length = maxlen - pos;
|
|
memcpy(s, buf, length);
|
|
s += length;
|
|
pos += length;
|
|
}
|
|
fmt = fmtc + 1;
|
|
}
|
|
|
|
if (point_to_n) *point_to_n = pos;
|
|
return(pos);
|
|
}
|