637 lines
20 KiB
C
637 lines
20 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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-fix precision in %g
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-%u printed as signed, %x, %o also is promoted to long long
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// FAIL 0x0FFFF7A7E as %x - signed long promotes sign, need %llx or %Lx and type conversion
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-%a
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-%n nothing printed
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-%17.18f digits maximum format
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-use %C as w_char L'x' (non standard extension)
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-radix point always '.', no LOCALEs
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*/
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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(long double number, int format1, int format2, char *s, int flags);
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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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int formatted_long_to_string(long long number, int format1, int prec, char *s, int flags);
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int formatted_hex_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags);
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int formatted_octa_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags);
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int formatted_double_special(long double number, char *s)
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// return 0 if no special values: NAN, INF. -0.0 ignored
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// http://steve.hollasch.net/cgindex/coding/ieeefloat.html
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{
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struct IEEExp {
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unsigned manl:32;
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unsigned manh:32;
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unsigned exp:15;
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unsigned sign:1;
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} *ip = (struct IEEExp *)&number;
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if (ip->exp != 0x7fff) return 0;
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if (ip->manh == 0x80000000 && ip->manl == 0) // Inf
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{
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if(ip->sign)
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strcpy(s, "-INF");
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else
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strcpy(s, "+INF");
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} else
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if (ip->manh & ~0x7fffffff)
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strcpy(s, "QNaN");
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else
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strcpy(s, "SNaN");
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return 4;
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}
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int copy_and_align(char *dest, int width, char *src, int src_len, char sign, int flags)
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// alingn number in buffer, put sign and fills additional places
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// flags used only flag_left_just and flag_lead_zeros
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// sign can be zero, 0, x, X, space, +, -
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{
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int rc = 0, sign_len;
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char fill;
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fill = (flags & flag_lead_zeros) ? '0' : ' ';
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if(sign == 'x' || sign == 'X')
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{
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sign_len = 2;
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} else
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if (sign)
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sign_len = 1;
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else
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sign_len = 0;
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if ((flags & flag_left_just) || (src_len + sign_len >= width)) // left justify or no room
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{
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if (sign)
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{
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if(sign == 'x' || sign == 'X')
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{
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dest[0] = '0';
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dest[1] = sign;
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memcpy(dest + 2, src, src_len);
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rc = src_len + 2;
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} else
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{ // single sign
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dest[0] = sign;
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memcpy(dest + 1, src, src_len);
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rc = src_len + 1;
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}
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} else
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{
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memcpy(dest, src, src_len);
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rc = src_len;
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}
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if (rc < width)
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{
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memset(dest + rc, fill, width - rc);
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rc = width;
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}
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} else // right justify and fill
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{
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rc = width;
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memcpy(dest + width - src_len, src, src_len);
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memset(dest, fill, width - src_len);
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if (flags & flag_lead_zeros)
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{
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if(sign == 'x' || sign == 'X')
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{
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dest[0] = '0';
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dest[1] = sign;
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} else
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if (sign) dest[0] = sign;
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} else
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{
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if(sign == 'x' || sign == 'X')
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{
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dest[width - src_len - 2] = '0';
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dest[width - src_len - 1] = sign;
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} else
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if (sign) dest[width - src_len - 1] = sign;
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}
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}
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return rc;
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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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long double norm_digit;
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long mul = 0;
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char sign = 0;
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char buf[50];
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int len;
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if((flags & flag_point) == 0) format2 = 6; // default prec if no point spec
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len = formatted_double_special(number, buf);
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if (len == 0)
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{
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if (number < 0) { sign = '-'; norm_digit = -number; }
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else
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{
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norm_digit = number;
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if (flags & flag_plus) sign = '+'; else
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if (flags & flag_space_plus) sign = ' ';
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}
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// normalize
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while (norm_digit < 1.0) { norm_digit *= 10; mul--; }
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while (norm_digit >= 10.0) { norm_digit /= 10; mul++; }
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len = formatted_double_to_string(norm_digit, 0, format2, buf, flags & ~(flag_plus | flag_space_plus));
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if (flags & flag_register)
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buf[len++] = 'E';
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else
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buf[len++] = 'e';
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len += formatted_long_to_string(mul, 0, 3, buf + len, flag_plus | flag_lead_zeros);
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}
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else
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flags &= ~flag_lead_zeros; // no need for INF, NAN
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len = copy_and_align(s, format1, buf, len, sign, flags);
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return len;
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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 sign = 0;
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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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i = formatted_double_special(number, buf);
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if (i == 0)
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{
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if (number < 0) {sign = '-'; number = -number; }
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else
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{
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if (flags & flag_plus) sign = '+'; else
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if (flags & flag_space_plus) sign = ' ';
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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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// form full number
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if (roundl(nafter) != 0 || fmt2 != 0)
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{
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*pbuf++ = '.';
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memcpy(pbuf, buf_low, pbuf_lo - buf_low); pbuf += pbuf_lo - buf_low;
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} else if (flags & flag_hash_sign)
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*pbuf++ = '.';
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}
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else
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{
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flags &= ~flag_lead_zeros; // no need for INF, NAN
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pbuf += i;
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}
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return copy_and_align(s, format1, buf, pbuf - buf, sign, flags);
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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 sign = 0;
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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(s, "-9223372036854775808");
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return strlen(s);
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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) {sign = '-'; number = -number; }
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else
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{
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if (flags & flag_plus) sign = '+'; else
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if (flags & flag_space_plus) sign = ' ';
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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 by prec
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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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return copy_and_align(s, format1, buf, pbuf - buf, sign, flags);
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}
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int formatted_hex_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags)
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{
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unsigned long long digit, mul;
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int i, div, fmt;
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char xdigs_lower[16]="0123456789abcdef";
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char xdigs_upper[16]="0123456789ABCDEF";
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char buf[50], *pbuf = buf, sign;
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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, "FFFFFFFFFFFFFFFF");
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pbuf += strlen(buf);
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}
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else
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{
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if (flags & flag_point) flags &= ~flag_lead_zeros; // conflicting flags
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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 < 16) { fmt = i + 1; break; }
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mul <<= 4;
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}
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// add leading zeros by prec
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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++ = (flags & flag_register) ? xdigs_upper[div] : xdigs_lower[div];
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digit = digit - div * mul;
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mul >>= 4;
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if (mul == 1 || mul == -1) break;
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}
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*pbuf++ = (flags & flag_register) ? xdigs_upper[digit] : xdigs_lower[digit];
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}
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sign = 0;
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if(flags & flag_hash_sign)
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sign = (flags & flag_register) ? 'X' : 'x';
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return copy_and_align(s, fmt1, buf, pbuf - buf, sign, flags);
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}
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int formatted_octa_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags)
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{
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unsigned long long digit, mul;
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int i, div, fmt;
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char xdigs_lower[16]="01234567";
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char buf[50], *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, "1777777777777777777777");
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pbuf += strlen(buf);
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}
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else
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{
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if (flags & flag_point) flags &= ~flag_lead_zeros; // conflicting flags
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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 < 8) { fmt = i + 1; break; }
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mul <<= 3;
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}
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// add leading zeros by prec
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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++ = xdigs_lower[div & 0x7];
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digit = digit - div * mul;
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mul >>= 3;
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if (mul == 1 || mul == -1) break;
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}
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*pbuf++ = xdigs_lower[digit];
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}
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return copy_and_align(s, fmt1, buf, pbuf - buf, (flags & flag_hash_sign) ? '0' : 0, flags);
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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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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)
|
|
fmt1 = fmt1 * 10 + (*fmt -'0');
|
|
else
|
|
fmt2 = fmt2 * 10 + (*fmt -'0');
|
|
break;
|
|
case '*':
|
|
if (flag_point == 0)
|
|
fmt1 = va_arg(argp, int);
|
|
else
|
|
fmt2 = va_arg(argp, int);
|
|
break;
|
|
case '.':
|
|
flags |= flag_point;
|
|
break;
|
|
case 'l': case 'L': case '+': // valid chars - skip
|
|
case '-': case ' ': case '#':
|
|
break;
|
|
default: // must be error
|
|
strncpy(dest, "print format error - %width.precision", maxlen);
|
|
return -1; // format char not found - user error
|
|
}
|
|
fmt++;
|
|
}
|
|
}
|
|
|
|
// do real work - format arguments values
|
|
length = 0;
|
|
switch(*fmtc)
|
|
{
|
|
case 'n':
|
|
point_to_n = va_arg(argp, int*);
|
|
break;
|
|
case 'c':
|
|
if (pos + 1 <= maxlen)
|
|
{
|
|
buf[0] = (char)va_arg(argp, int);
|
|
length = 1;
|
|
}
|
|
break;
|
|
case 's': // special case - without buf
|
|
str = va_arg(argp, char*);
|
|
length = strlen(str);
|
|
if ((flags & flag_point) && (length > fmt2)) length = fmt2; // cut by precision
|
|
if (pos + length > maxlen) length = maxlen - pos;
|
|
memcpy(s, str ,length);
|
|
s += length;
|
|
pos += length;
|
|
break;
|
|
case 'd': case 'i': case 'u': case 'U':
|
|
if (flag_long == 0) intdigit = va_arg(argp, int); else
|
|
if (flag_long == 1) intdigit = va_arg(argp, long); else
|
|
if (flag_long == 2) intdigit = va_arg(argp, long long);
|
|
length = formatted_long_to_string(intdigit, fmt1, fmt2, buf, flags);
|
|
break;
|
|
case 'o':
|
|
if (flag_long == 0) intdigit = va_arg(argp, int); else
|
|
if (flag_long == 1) intdigit = va_arg(argp, long); else
|
|
if (flag_long == 2) intdigit = va_arg(argp, long long);
|
|
length = formatted_octa_to_string(intdigit, fmt1, fmt2, buf, flags);
|
|
break;
|
|
case 'p': case 'P': case 'x': case 'X':
|
|
if (flag_long == 0) intdigit = va_arg(argp, int); else
|
|
if (flag_long == 1) intdigit = va_arg(argp, long); else
|
|
if (flag_long == 2) intdigit = va_arg(argp, long long);
|
|
length=formatted_hex_to_string(intdigit, fmt1, fmt2, buf, flags);
|
|
break;
|
|
case 'a': case 'A': case 'f': case 'F':
|
|
if (flag_long <= 1) doubledigit = va_arg(argp, double); else
|
|
if (flag_long == 2) doubledigit = va_arg(argp, long double);
|
|
length = formatted_double_to_string(doubledigit, fmt1, fmt2, buf, flags);
|
|
break;
|
|
case 'e': case 'E':
|
|
if (flag_long <= 1) doubledigit = va_arg(argp, double); else
|
|
if (flag_long == 2) doubledigit = va_arg(argp, long double);
|
|
length = formatted_double_to_string_scientific(doubledigit, fmt1, fmt2, buf, flags);
|
|
break;
|
|
case 'g': case 'G':
|
|
//prec special case, this is just workaround
|
|
if (flag_long <= 1) doubledigit = va_arg(argp, double); else
|
|
if (flag_long == 2) doubledigit = va_arg(argp, long double);
|
|
length = formatted_double_to_string(doubledigit, fmt1, fmt2, buf, flags);
|
|
i = formatted_double_to_string_scientific(doubledigit, fmt1, fmt2, buf + sizeof buf / 2, flags);
|
|
if(length > i)
|
|
{
|
|
memcpy(buf, buf + sizeof buf / 2, i);
|
|
length = i;
|
|
}
|
|
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);
|
|
}
|