kolibrios/programs/develop/ktcc/trunk/libc/stdio/format_print.c

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/*
function for format output to the string
Siemargl update formats as http://www.cplusplus.com/reference/cstdio/printf/, no wchar though
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap05.html is used too
%g explain https://support.microsoft.com/en-us/kb/43392
todo:
-fix precision in %g
-%u printed as signed, %x, %o also is promoted to long long
// FAIL 0x0FFFF7A7E as %x - signed long promotes sign, need %llx or %Lx and type conversion
-%a
-%n nothing printed
-%17.18f digits maximum format
-use %C as w_char L'x' (non standard extension)
-radix point always '.', no LOCALEs
*/
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <math.h>
#include <stdarg.h>
enum flags_t
{
flag_unsigned = 0x02,
flag_register = 0x04,
flag_plus = 0x08,
flag_left_just = 0x10,
flag_lead_zeros = 0x20,
flag_space_plus = 0x40,
flag_hash_sign = 0x80,
flag_point = 0x100
};
int formatted_double_to_string(long double number, int format1, int format2, char *s, int flags);
int formatted_double_to_string_scientific(long double number, int format1, int format2, char *s, int flags);
int formatted_long_to_string(long long number, int format1, int prec, char *s, int flags);
int formatted_hex_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags);
int formatted_octa_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags);
int formatted_double_special(long double number, char *s)
// return 0 if no special values: NAN, INF. -0.0 ignored
// http://steve.hollasch.net/cgindex/coding/ieeefloat.html
{
struct IEEExp {
unsigned manl:32;
unsigned manh:32;
unsigned exp:15;
unsigned sign:1;
} *ip = (struct IEEExp *)&number;
if (ip->exp != 0x7fff) return 0;
if (ip->manh == 0x80000000 && ip->manl == 0) // Inf
{
if(ip->sign)
strcpy(s, "-INF");
else
strcpy(s, "+INF");
} else
if (ip->manh & ~0x7fffffff)
strcpy(s, "QNaN");
else
strcpy(s, "SNaN");
return 4;
}
int copy_and_align(char *dest, int width, char *src, int src_len, char sign, int flags)
// alingn number in buffer, put sign and fills additional places
// flags used only flag_left_just and flag_lead_zeros
// sign can be zero, 0, x, X, space, +, -
{
int rc = 0, sign_len;
char fill;
fill = (flags & flag_lead_zeros) ? '0' : ' ';
if(sign == 'x' || sign == 'X')
{
sign_len = 2;
} else
if (sign)
sign_len = 1;
else
sign_len = 0;
if ((flags & flag_left_just) || (src_len + sign_len >= width)) // left justify or no room
{
if (sign)
{
if(sign == 'x' || sign == 'X')
{
dest[0] = '0';
dest[1] = sign;
memcpy(dest + 2, src, src_len);
rc = src_len + 2;
} else
{ // single sign
dest[0] = sign;
memcpy(dest + 1, src, src_len);
rc = src_len + 1;
}
} else
{
memcpy(dest, src, src_len);
rc = src_len;
}
if (rc < width)
{
memset(dest + rc, fill, width - rc);
rc = width;
}
} else // right justify and fill
{
rc = width;
memcpy(dest + width - src_len, src, src_len);
memset(dest, fill, width - src_len);
if (flags & flag_lead_zeros)
{
if(sign == 'x' || sign == 'X')
{
dest[0] = '0';
dest[1] = sign;
} else
if (sign) dest[0] = sign;
} else
{
if(sign == 'x' || sign == 'X')
{
dest[width - src_len - 2] = '0';
dest[width - src_len - 1] = sign;
} else
if (sign) dest[width - src_len - 1] = sign;
}
}
return rc;
}
int formatted_double_to_string_scientific(long double number, int format1, int format2, char *s, int flags)
{
long double norm_digit;
long mul = 0;
char sign = 0;
char buf[50];
int len;
if((flags & flag_point) == 0) format2 = 6; // default prec if no point spec
len = formatted_double_special(number, buf);
if (len == 0)
{
if (number < 0) { sign = '-'; norm_digit = -number; }
else
{
norm_digit = number;
if (flags & flag_plus) sign = '+'; else
if (flags & flag_space_plus) sign = ' ';
}
// normalize
while (norm_digit < 1.0) { norm_digit *= 10; mul--; }
while (norm_digit >= 10.0) { norm_digit /= 10; mul++; }
len = formatted_double_to_string(norm_digit, 0, format2, buf, flags & ~(flag_plus | flag_space_plus));
if (flags & flag_register)
buf[len++] = 'E';
else
buf[len++] = 'e';
len += formatted_long_to_string(mul, 0, 3, buf + len, flag_plus | flag_lead_zeros);
}
else
flags &= ~flag_lead_zeros; // no need for INF, NAN
len = copy_and_align(s, format1, buf, len, sign, flags);
return len;
}
int formatted_double_to_string(long double number, int format1, int format2, char *s, int flags)
{
long double nafter, beforpointdigit;
long long intdigit, mul;
int div;
int i;
char sign = 0;
int fmt1;
int fmt2;
char buf[100], *pbuf = buf;
char buf_low[50], *pbuf_lo = buf_low;
if((flags & flag_point) == 0) format2 = 6; // default prec if no point spec
i = formatted_double_special(number, buf);
if (i == 0)
{
if (number < 0) {sign = '-'; number = -number; }
else
{
if (flags & flag_plus) sign = '+'; else
if (flags & flag_space_plus) sign = ' ';
}
fmt1 = 1;
fmt2 = format2;
if (fmt2 > 18) fmt2 = 18; //maximum size of long long type
beforpointdigit = floor(number + 0.00000000000001);
nafter = number - beforpointdigit;
//print part of number before point
mul = 1;
for(i = 0; i < sizeof buf - 1; i++)
{
mul *= 10;
if ((beforpointdigit/mul) < 1.0) { fmt1 = i + 1; break; }
}
if (i == sizeof buf - 1 || fmt1 > 17)
{
strcpy(s, "[too big number for %f, %a]");
return strlen(s);
}
mul /= 10;
while(mul > 1)
{
div = beforpointdigit / mul;
*pbuf++ = (char)div + '0';
beforpointdigit = beforpointdigit - div * mul;
mul /= 10;
}
*pbuf++=(char)beforpointdigit + '0';
//print part of number after point
mul = 1;
for(i = 0; i < fmt2; i++)
{
nafter = nafter*10;
mul *= 10;
}
intdigit = roundl(nafter);
mul /= 10;
for(i = 0; i < fmt2 - 1; i++)
{
div = intdigit / mul;
*pbuf_lo++=(char)div + '0';
intdigit = intdigit - div * mul;
mul /= 10;
if (mul == 1) break;
}
*pbuf_lo++ = (char)intdigit + '0';
// form full number
if (roundl(nafter) != 0 || fmt2 != 0)
{
*pbuf++ = '.';
memcpy(pbuf, buf_low, pbuf_lo - buf_low); pbuf += pbuf_lo - buf_low;
} else if (flags & flag_hash_sign)
*pbuf++ = '.';
}
else
{
flags &= ~flag_lead_zeros; // no need for INF, NAN
pbuf += i;
}
return copy_and_align(s, format1, buf, pbuf - buf, sign, flags);
}
int formatted_long_to_string(long long number, int format1, int prec, char *s, int flags)
{
int i;
int fmt;
char sign = 0;
long long digit;
long long mul;
int div;
char buf[100], *pbuf = buf;
if (number == -9223372036854775807LL - 1) // overflow all our math, cant minus this
{
strcpy(s, "-9223372036854775808");
return strlen(s);
}
if (flags & flag_point) flags &= ~flag_lead_zeros; // conflicting flags
if (number < 0) {sign = '-'; number = -number; }
else
{
if (flags & flag_plus) sign = '+'; else
if (flags & flag_space_plus) sign = ' ';
}
digit = number;
mul = (digit < 0) ? -1 : 1;
for(i = 0; i < sizeof buf - 2; i++)
{
if (digit / mul < 10) { fmt = i + 1; break; }
mul *= 10;
}
// add leading zeros by prec
for(i = 0; i < prec - fmt; i++) *pbuf++ = '0';
for(i = 0; i < fmt - 1; i++)
{
div = digit / mul;
*pbuf++ = (char)div + '0';
digit = digit - div * mul;
mul /= 10;
if (mul == 1 || mul == -1) break;
}
*pbuf++ = (char)digit + '0';
return copy_and_align(s, format1, buf, pbuf - buf, sign, flags);
}
int formatted_hex_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags)
{
unsigned long long digit, mul;
int i, div, fmt;
char xdigs_lower[16]="0123456789abcdef";
char xdigs_upper[16]="0123456789ABCDEF";
char buf[50], *pbuf = buf, sign;
if (number == -9223372036854775807LL - 1) // overflow all our math, cant minus this
{
strcpy(buf, "FFFFFFFFFFFFFFFF");
pbuf += strlen(buf);
}
else
{
if (flags & flag_point) flags &= ~flag_lead_zeros; // conflicting flags
digit = number;
mul = (digit < 0) ? -1 : 1;
for(i = 0; i < sizeof buf - 2; i++)
{
if (digit / mul < 16) { fmt = i + 1; break; }
mul <<= 4;
}
// add leading zeros by prec
for(i = 0; i < prec - fmt; i++) *pbuf++ = '0';
for(i = 0; i < fmt - 1; i++)
{
div = digit / mul;
*pbuf++ = (flags & flag_register) ? xdigs_upper[div] : xdigs_lower[div];
digit = digit - div * mul;
mul >>= 4;
if (mul == 1 || mul == -1) break;
}
*pbuf++ = (flags & flag_register) ? xdigs_upper[digit] : xdigs_lower[digit];
}
sign = 0;
if(flags & flag_hash_sign)
sign = (flags & flag_register) ? 'X' : 'x';
return copy_and_align(s, fmt1, buf, pbuf - buf, sign, flags);
}
int formatted_octa_to_string(unsigned long long number, int fmt1, int prec, char *s, int flags)
{
unsigned long long digit, mul;
int i, div, fmt;
char xdigs_lower[16]="01234567";
char buf[50], *pbuf = buf;
if (number == -9223372036854775807LL - 1) // overflow all our math, cant minus this
{
strcpy(buf, "1777777777777777777777");
pbuf += strlen(buf);
}
else
{
if (flags & flag_point) flags &= ~flag_lead_zeros; // conflicting flags
digit = number;
mul = (digit < 0) ? -1 : 1;
for(i = 0; i < sizeof buf - 2; i++)
{
if (digit / mul < 8) { fmt = i + 1; break; }
mul <<= 3;
}
// add leading zeros by prec
for(i = 0; i < prec - fmt; i++) *pbuf++ = '0';
for(i = 0; i < fmt - 1; i++)
{
div = digit / mul;
*pbuf++ = xdigs_lower[div & 0x7];
digit = digit - div * mul;
mul >>= 3;
if (mul == 1 || mul == -1) break;
}
*pbuf++ = xdigs_lower[digit];
}
return copy_and_align(s, fmt1, buf, pbuf - buf, (flags & flag_hash_sign) ? '0' : 0, flags);
}
//int vsnprintf (char * s, size_t n, const char * format, va_list arg );
int format_print(char *dest, size_t maxlen, const char *fmt0, va_list argp)
{
int i;
int length;
int fmt1, fmt2; // width, precision
size_t pos, posc;
long long intdigit;
long double doubledigit;
const char *fmt, *fmtc; // first point to %, fmtc points to specifier
char *s; // pointer to current dest char
char *str;
char buf[200]; // buffer for current argument value print representation
int format_flag;
int flag_long; // 2 = long double or long long int or wchar
int *point_to_n = NULL;
int flags; // parsed flags
fmt = fmt0;
s = dest;
pos = 0;
while(pos < maxlen)
{
if (*fmt != '%') // usual char
{
if ('\0' == (*s++ = *fmt++)) break;
pos++;
continue;
}
if (*(fmt + 1) == '%') // %%
{
*s++ = '%'; pos++;
fmt += 2;
continue;
}
//checking to containg format in the string
fmtc = fmt;
posc = pos;
flags = 0;
format_flag = 0;
flag_long = 0; // 2 = long double or long long int or wchar
while(*fmtc != '\0' && !format_flag) // searching end of format
{
fmtc++; posc++;
switch( *fmtc )
{
case 'a':
format_flag = 1;
flags |= flag_unsigned;
break;
case 'A':
format_flag = 1;
flags |= flag_unsigned | flag_register;
break;
case 'c': case 'd': case 'i': case 'e': case 'f': case 'g': case 's': case 'n':
format_flag = 1;
break;
case 'E': case 'F': case 'G':
format_flag = 1;
flags |= flag_register;
break;
case 'l':
flag_long = flag_long ? 2 : 1; // ll.eq.L
break;
case 'L':
flag_long = 2;
break;
case 'o': case 'u': case 'x': case 'p':
format_flag = 1;
flags |= flag_unsigned;
break;
case 'X': case 'P':
format_flag = 1;
flags |= flag_unsigned | flag_register;
break;
case '+':
flags |= flag_plus;
break;
case '-':
flags |= flag_left_just;
break;
case ' ': // space
flags |= flag_space_plus;
break;
case '#':
flags |= flag_hash_sign;
break;
case '*': case '.': // just skip
break;
default:
if(isdigit(*fmtc)) break;
strncpy(dest, "print format error - in % invalid char found", maxlen);
return -1; // non format char found - user error
}
}
if (format_flag == 0)
{
strncpy(dest, "print format error - % without format specifier", maxlen);
return -1; // format char not found - user error
}
fmt1 = 0;
fmt2 = 0;
if (posc - pos > 1) // try to read width, precision
{
fmt++;
for(i = pos + 1; i < posc; i++)
{
switch(*fmt)
{
case '0':
if(fmt1 == 0 && (flags & flag_point) == 0) flags |= flag_lead_zeros;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
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);
}