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prnf.c
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prnf.c
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/*
*/
#ifndef SECOND_PASS
#define FIRST_PASS
#define IS_SECOND_PASS false
#include <stdbool.h>
#include <stdint.h>
#include <limits.h>
#include "prnf.h"
//********************************************************************************************************
// Local defines
//********************************************************************************************************
// Include configuration file if one has been provided (see prnf.h)
#ifdef PRNF_CFG_FILE
#define prnfcfg_xstr(s) prnfcfg_str(s)
#define prnfcfg_str(s) #s
#include prnfcfg_xstr(PRNF_CFG_FILE)
#endif
#ifndef PRNF_ENG_PREC_DEFAULT
#define PRNF_ENG_PREC_DEFAULT 0
#endif
#ifndef PRNF_FLOAT_PREC_DEFAULT
#define PRNF_FLOAT_PREC_DEFAULT 3
#endif
#ifndef PRNF_WARN
#define PRNF_WARN(arg) ((void)0)
#endif
#ifndef PRNF_ASSERT
#define PRNF_ASSERT(arg) ((void)0)
#endif
#ifdef PRNF_SUPPORT_LONG_LONG
typedef long long prnf_long_t;
typedef unsigned long long prnf_ulong_t;
#define PRNF_ULONG_MAX ULLONG_MAX
#else
typedef long prnf_long_t;
typedef unsigned long prnf_ulong_t;
#define PRNF_ULONG_MAX ULONG_MAX
#if SIZE_MAX > ULONG_NAX
#warning "size_t is larger than unsigned long, and support for long long is not enabled. You should define PRNF_SUPPORT_LONG_LONG if you intend to use %z placeholders"
#endif
#endif
#ifdef PRNF_SUPPORT_DOUBLE
typedef double prnf_float_t;
#ifndef PRNF_SUPPORT_FLOAT
#define PRNF_SUPPORT_FLOAT
#endif
#else
typedef float prnf_float_t;
#endif
#define HEX_DIGITS_STRING "0123456789ABCDEF"
#if PRNF_ULONG_MAX == 4294967295U
#define INT_BUF_SIZE 10
#define FLOAT_PREC_MAX 9
#define LONG_IS_32
#elif PRNF_ULONG_MAX == 18446744073709551615U
#define INT_BUF_SIZE 20
#define FLOAT_PREC_MAX 19
#else
#ifdef PRNF_SUPPORT_LONG_LONG
#error Long Long is not 32bit or 64bit
#else
#error Long is not 32bit or 64bit
#endif
#endif
#define NO_PREFIX 0
#define IS_PGM true
#define IS_NOT_PGM false
#ifndef SIZE_MAX
#define SIZE_MAX ((size_t)(ssize_t)(-1))
#endif
#ifdef PRNF_SUPPORT_FLOAT
#include <float.h>
#endif
// Macro for reading characters from the format string. For AVR we may need to read from PROGMEM or RAM so fmt_rd_either() is used.
#ifdef PLATFORM_AVR
#define FMTRD(_fmt) fmt_rd_either(_fmt, is_pgm)
#else
#define FMTRD(_fmt) (*(_fmt))
#endif
enum {TYPE_NONE, TYPE_BIN, TYPE_INT, TYPE_UINT, TYPE_HEX, TYPE_STR, TYPE_PSTR, TYPE_NSTR, TYPE_CHAR, TYPE_FLOAT, TYPE_ENG}; // di u xX s S c fF eE
struct placeholder_struct
{
bool flag_minus;
bool flag_zero;
char sign_pad; //'+' or ' ' if a prepend character for positive numeric types is specified. Otherwise 0
bool prec_specified;
int width;
int prec;
bool prec_is_dynamic;
bool width_is_dynamic;
uint_least8_t size_modifier; //equal to size of int, or size of specified type (l h hh etc)
uint_least8_t type; //TYPE_x
};
struct out_struct
{
#ifdef PRNF_COL_ALIGNMENT
int col;
#endif
int char_cnt;
int size_limit;
char* buf;
void* dst_fptr_vars;
void(*dst_fptr)(void*, char);
};
struct eng_struct
{
prnf_float_t value;
char prefix;
};
// A union capable of holding any type of argument passed in the variable argument list
union varg_union
{
prnf_long_t prnf_l;
prnf_ulong_t prnf_ul;
long l;
unsigned long ul;
int i;
unsigned int ui;
prnf_float_t f;
char* str;
char c;
};
#endif //FIRST PASS
#ifdef FIRST_PASS
#define prnf_PX prnf
#define sprnf_PX sprnf
#define snprnf_PX snprnf
#define snappf_PX snappf
#define vprnf_PX vprnf
#define vsprnf_PX vsprnf
#define vsnprnf_PX vsnprnf
#define fptrprnf_PX fptrprnf
#define vfptrprnf_PX vfptrprnf
#else
#undef prnf_PX
#undef sprnf_PX
#undef snprnf_PX
#undef snappf_PX
#undef vprnf_PX
#undef vsprnf_PX
#undef vsnprnf_PX
#undef fptrprnf_PX
#undef vfptrprnf_PX
#define prnf_PX prnf_P
#define sprnf_PX sprnf_P
#define snprnf_PX snprnf_P
#define snappf_PX snappf_P
#define vprnf_PX vprnf_P
#define vsprnf_PX vsprnf_P
#define vsnprnf_PX vsnprnf_P
#define fptrprnf_PX fptrprnf_P
#define vfptrprnf_PX vfptrprnf_P
#endif
//********************************************************************************************************
// Public variables
//********************************************************************************************************
#ifdef FIRST_PASS
// Default character output, may be pointed at an application provided putchar(void*, charx)
// The void* is passed a NULL
void(*prnf_out_fptr)(void*, char) = NULL;
#endif
//********************************************************************************************************
// Private variables
//********************************************************************************************************
#ifdef FIRST_PASS
#ifdef PRNF_SUPPORT_FLOAT
#ifdef LONG_IS_32
static prnf_float_t pow10_tbl[10] = {1E0F, 1E1F, 1E2F, 1E3F, 1E4F, 1E5F, 1E6F, 1E7F, 1E8F, 1E9F};
#else
static prnf_float_t pow10_tbl[20] = {1E0F, 1E1F, 1E2F, 1E3F, 1E4F, 1E5F, 1E6F, 1E7F, 1E8F, 1E9F, 1E10F, 1E11F, 1E12F, 1E13F, 1E14F, 1E15F, 1E16F, 1E17F, 1E18F, 1E19F};
#endif
#endif
#endif
//********************************************************************************************************
// Private prototypes
//********************************************************************************************************
#ifdef FIRST_PASS
static const char* parse_placeholder(struct placeholder_struct* placeholder, const char* fmtstr, bool is_pgm);
static void print_placeholder(struct out_struct* out_info, union varg_union varg, struct placeholder_struct* placeholder);
static int core_prnf(struct out_struct* out_info, const char* fmtstr, bool is_pgm, va_list va);
#ifdef PRNF_COL_ALIGNMENT
static const char* print_col_alignment(struct out_struct* out_info, const char* fmtstr, bool is_pgm);
#endif
static void print_hex_dec(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_long_t value);
static void print_bin(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_ulong_t uvalue);
#ifdef PRNF_SUPPORT_FLOAT
static void print_float(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_float_t value, char postpend);
static const char* determine_float_msg(struct placeholder_struct* placeholder, prnf_float_t value);
static char determine_sign_char_of_float(struct placeholder_struct* placeholder, prnf_float_t value);
static void print_float_normal(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_float_t value, char postpend);
static void print_float_special(struct out_struct* out_info, struct placeholder_struct* placeholder, const char* out_msg, prnf_float_t value);
static struct eng_struct get_eng(prnf_float_t value);
static prnf_ulong_t round_float_to_ulong(prnf_float_t x);
static uint_least8_t get_prec(struct placeholder_struct* placeholder);
#endif
static void prepad(struct out_struct* out_info, struct placeholder_struct* placeholder, int source_len);
static void postpad(struct out_struct* out_info, struct placeholder_struct* placeholder, int source_len);
static bool is_type_int(uint_least8_t type);
static bool is_type_unsigned(uint_least8_t type);
static bool is_type_numeric(uint_least8_t type);
static bool is_centered_string(struct placeholder_struct* placeholder);
static bool prnf_is_digit(char x);
static char ascii_hex_digit(uint_least8_t x);
static uint_least8_t ulong2asc_revdec(char* buf, prnf_ulong_t il);
static uint_least8_t ulong2asc_revbin(char* buf, prnf_ulong_t il);
static uint_least8_t ulong2asc_revhex(char* buf, prnf_ulong_t il);
static void out_char(struct out_struct* out_info, char x);
static void out_terminate(struct out_struct* out_info);
static void print_str(struct out_struct* out_info, struct placeholder_struct* placeholder, const char* str, bool is_pgm);
static int prnf_strlen(const char* str, bool is_pgm, int max);
static int prnf_atoi(const char** fmtstr, bool is_pgm);
#ifdef PLATFORM_AVR
static char fmt_rd_either(const char* fmt, bool is_pgm);
#endif
#endif //FIRST_PASS
//********************************************************************************************************
// Public functions
//********************************************************************************************************
// On AVR platforms these _PX functions are compiled twice.
// On the first pass prnf_PX expands to prnf which reads the format string from RAM.
// On the second pass prnf_PX expands to prnf_P which reads the format string from PROGMEM.
int prnf_PX(const char* fmtstr, ...)
{
va_list va;
va_start(va, fmtstr);
const int ret = vprnf_PX(fmtstr, va);
va_end(va);
return ret;
}
int sprnf_PX(char* dst, const char* fmtstr, ...)
{
va_list va;
va_start(va, fmtstr);
const int ret = vsprnf_PX(dst, fmtstr, va);
va_end(va);
return ret;
}
int snprnf_PX(char* dst, size_t dst_size, const char* fmtstr, ...)
{
va_list va;
va_start(va, fmtstr);
const int ret = vsnprnf_PX(dst, dst_size, fmtstr, va);
va_end(va);
return ret;
}
int snappf_PX(char* dst, size_t dst_size, const char* fmtstr, ...)
{
va_list va;
va_start(va, fmtstr);
int chars_written = 0;
int org_len;
if(dst_size)
org_len = prnf_strlen(dst, false, (int)(dst_size-1));
else
org_len = 0;
chars_written = vsnprnf_PX(&dst[org_len], dst_size-org_len, fmtstr, va);
va_end(va);
return chars_written;
}
int fptrprnf_PX(void(*out_fptr)(void*, char), void* out_vars, const char* fmtstr, ...)
{
va_list va;
va_start(va, fmtstr);
const int ret = vfptrprnf_PX(out_fptr, out_vars, fmtstr, va);
va_end(va);
return ret;
}
int vprnf_PX(const char* fmtstr, va_list va)
{
struct out_struct out_info = {.dst_fptr = prnf_out_fptr};
return core_prnf(&out_info, fmtstr, IS_SECOND_PASS, va);
}
int vsprnf_PX(char* dst, const char* fmtstr, va_list va)
{
struct out_struct out_info = {.size_limit=INT_MAX, .buf=dst};
return core_prnf(&out_info, fmtstr, IS_SECOND_PASS, va);
}
int vsnprnf_PX(char* dst, size_t dst_size, const char* fmtstr, va_list va)
{
struct out_struct out_info = {.size_limit=dst_size, .buf=dst};
return core_prnf(&out_info, fmtstr, IS_SECOND_PASS, va);
}
int vfptrprnf_PX(void(*out_fptr)(void*, char), void* out_vars, const char* fmtstr, va_list va)
{
struct out_struct out_info = {.dst_fptr_vars=out_vars, .dst_fptr=out_fptr};
return core_prnf(&out_info, fmtstr, IS_SECOND_PASS, va);
}
//********************************************************************************************************
// Private functions
//********************************************************************************************************
// wrappers for PGM or non-PGM access
#ifdef FIRST_PASS
#ifdef PLATFORM_AVR
static char fmt_rd_either(const char* fmt, bool is_pgm)
{
return is_pgm? pgm_read_byte(fmt):(*fmt);
}
#endif
//Read from variable argument list (src) to varg union (dst)
#define READ_VARG(dst, placeholder, src) \
do \
{ \
if(placeholder.width_is_dynamic) \
{ \
placeholder.width = va_arg(va, int); \
if(placeholder.width < 0) \
{ \
placeholder.width = -placeholder.width; \
placeholder.flag_minus = true; \
}; \
}; \
\
if(placeholder.prec_is_dynamic) \
placeholder.prec = va_arg(va, int); \
\
if(is_type_int(placeholder.type)) \
{ \
if(placeholder.size_modifier == sizeof(prnf_ulong_t)) \
dst.prnf_ul = va_arg(src, prnf_ulong_t); \
else if(placeholder.size_modifier == sizeof(long)) \
{ \
dst.ul = va_arg(src, unsigned long); \
if(is_type_unsigned(placeholder.type)) \
dst.prnf_ul = dst.ul; \
else \
dst.prnf_l = dst.l; \
} \
else \
{ \
dst.ui = va_arg(src, unsigned int); \
if(is_type_unsigned(placeholder.type)) \
dst.prnf_ul = dst.ui; \
else \
dst.prnf_l = dst.i; \
}; \
} \
else if(placeholder.type == TYPE_FLOAT || placeholder.type == TYPE_ENG) \
dst.f = (prnf_float_t)va_arg(src, double); \
\
else if(placeholder.type == TYPE_CHAR) \
dst.c = (char)va_arg(src, int); \
\
else if(placeholder.type == TYPE_STR || placeholder.type == TYPE_PSTR) \
dst.str = va_arg(src, char*); \
\
else if(placeholder.type == TYPE_NSTR) \
dst.str = (char*)va_arg(src, int*); \
\
}while(false)
static int core_prnf(struct out_struct* out_info, const char* fmtstr, bool is_pgm, va_list va)
{
struct placeholder_struct placeholder;
union varg_union varg;
while(FMTRD(fmtstr))
{
// placeholder? %[flags][width][.precision][length]type
if(FMTRD(fmtstr) == '%')
{
fmtstr++;
if(FMTRD(fmtstr) == '%')
{
out_char(out_info, '%');
fmtstr++;
}
else
{
fmtstr = parse_placeholder(&placeholder, fmtstr, is_pgm);
READ_VARG(varg, placeholder, va);
print_placeholder(out_info, varg, &placeholder);
};
}
#ifdef PRNF_COL_ALIGNMENT
// colum alignment?
else if(FMTRD(fmtstr) == '\v')
{
fmtstr++;
fmtstr = print_col_alignment(out_info, fmtstr, is_pgm);
}
#endif
else
{
out_char(out_info, FMTRD(fmtstr));
fmtstr++;
};
};
// Terminate
out_terminate(out_info);
return out_info->char_cnt;
}
// parse textual placeholder information into a placeholder_struct
static const char* parse_placeholder(struct placeholder_struct* dst, const char* fmtstr, bool is_pgm)
{
struct placeholder_struct placeholder = {.size_modifier=sizeof(int), .type=TYPE_NONE};
bool finished;
//Get flags
do
{
finished = false;
switch(FMTRD(fmtstr))
{
case '0': placeholder.flag_zero = true; break;
case '-': placeholder.flag_minus = true; break;
case '+': placeholder.sign_pad = '+'; break;
case ' ': placeholder.sign_pad = ' '; break;
case '#': PRNF_WARN(true); break; //unsupported flag
case '\'': PRNF_WARN(true); break; //unsupported flag
default : finished = true; break;
};
if(!finished)
fmtstr++;
}while(!finished);
//Get width
if(FMTRD(fmtstr) == '*')
{
placeholder.width_is_dynamic = true;
fmtstr++;
}
else
placeholder.width = prnf_atoi(&fmtstr, is_pgm);
//Get precision
if(FMTRD(fmtstr) == '.')
{
placeholder.prec_specified = true;
fmtstr++;
if(FMTRD(fmtstr) == '*')
{
placeholder.prec_is_dynamic = true;
fmtstr++;
}
else
placeholder.prec = prnf_atoi(&fmtstr, is_pgm);
};
//Get size modifier
switch(FMTRD(fmtstr))
{
case 'h' :
fmtstr++;
if(FMTRD(fmtstr) == 'h')
{
placeholder.size_modifier = sizeof(char);
fmtstr++;
}
else
placeholder.size_modifier = sizeof(short);
break;
case 'l' :
fmtstr++;
#ifdef PRNF_SUPPORT_LONG_LONG
if(FMTRD(fmtstr) == 'l')
{
placeholder.size_modifier = sizeof(long long);
fmtstr++;
}
else
placeholder.size_modifier = sizeof(long);
#else
PRNF_ASSERT(FMTRD(fmtstr) != 'l'); //unsupported long long
placeholder.size_modifier = sizeof(long);
#endif
break;
case 't' :
fmtstr++;
placeholder.size_modifier = sizeof(ptrdiff_t);
break;
case 'z' :
fmtstr++;
placeholder.size_modifier = sizeof(size_t);
break;
case 'L' : //unsupported long double
case 'j' : //unsupported intmax_t
PRNF_ASSERT(false);
};
//Get type
switch(FMTRD(fmtstr))
{
case 'd' :
case 'i' :
placeholder.type = TYPE_INT;
break;
case 'o' :
placeholder.type = TYPE_BIN;
break;
case 'u' :
placeholder.type = TYPE_UINT;
break;
case 'x' :
case 'X' :
placeholder.type = TYPE_HEX;
break;
#ifdef PRNF_SUPPORT_FLOAT
case 'f' :
case 'F' :
placeholder.type = TYPE_FLOAT;
break;
case 'e' :
case 'E' :
placeholder.type = TYPE_ENG;
break;
#endif
case 'S' :
#ifdef PLATFORM_AVR
placeholder.type = TYPE_PSTR;
break;
#endif
case 's' :
placeholder.type = TYPE_STR;
break;
#ifdef PRNF_SUPPORT_EXTENSIONS
case 'n' :
placeholder.type = TYPE_NSTR;
break;
#endif
case 'c' :
placeholder.type = TYPE_CHAR;
break;
default :
PRNF_ASSERT(false); //unsupported type
break;
};
fmtstr++;
//ignore zero flag for int types when precision is specified
if(placeholder.prec_specified && is_type_int(placeholder.type))
placeholder.flag_zero = false;
*dst = placeholder;
return fmtstr;
}
static void print_placeholder(struct out_struct* out_info, union varg_union varg, struct placeholder_struct* placeholder)
{
#ifdef PRNF_SUPPORT_FLOAT
struct eng_struct eng;
#endif
if(placeholder->type == TYPE_INT || placeholder->type == TYPE_UINT || placeholder->type == TYPE_HEX)
print_hex_dec(out_info, placeholder, varg.prnf_l);
else if(placeholder->type == TYPE_BIN)
print_bin(out_info, placeholder, varg.prnf_ul);
#ifdef PRNF_SUPPORT_FLOAT
else if(placeholder->type == TYPE_FLOAT)
print_float(out_info, placeholder, varg.f, NO_PREFIX);
else if(placeholder->type == TYPE_ENG)
{
eng = get_eng(varg.f);
print_float(out_info, placeholder, eng.value, eng.prefix);
}
#endif
else if(placeholder->type == TYPE_CHAR)
out_char(out_info, varg.c);
else if(placeholder->type == TYPE_STR)
print_str(out_info, placeholder, varg.str, IS_NOT_PGM);
#ifdef PLATFORM_AVR
else if(placeholder->type == TYPE_PSTR)
print_str(out_info, placeholder, varg.str, IS_PGM);
#endif
#ifdef PRNF_SUPPORT_EXTENSIONS
else if(placeholder->type == TYPE_NSTR)
{
print_str(out_info, placeholder, varg.str, IS_NOT_PGM);
prnf_free(varg.str);
};
#endif
}
//Handles both signed and unsigned integers, and hex
static void print_hex_dec(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_long_t value)
{
prnf_ulong_t uvalue;
int number_len;
int field_size; // (number digits + 0 padding for precision + sign character)
int zero_pad_len = 0;
char sign_char = 0;
char txt[INT_BUF_SIZE];
char* txt_ptr;
bool sign_char_already_output = 0;
if(is_type_unsigned(placeholder->type))
uvalue = (prnf_ulong_t)value;
else
{
uvalue = value;
if(value < 0.0)
{
sign_char = '-';
uvalue = -value;
}
else if(placeholder->sign_pad)
sign_char = placeholder->sign_pad;
};
if(placeholder->type == TYPE_HEX)
number_len = ulong2asc_revhex(txt, uvalue);
else
number_len = ulong2asc_revdec(txt, uvalue);
txt_ptr = &txt[number_len];
//if more digits required, determine amount of zero padding to meet precision
if(placeholder->prec_specified && placeholder->prec > number_len)
zero_pad_len = placeholder->prec - number_len;
field_size = number_len + zero_pad_len + !!sign_char;
//If there will be a sign character, and width prepadding is with '0', output the sign character first
if(sign_char && placeholder->flag_zero)
{
out_char(out_info, sign_char);
sign_char_already_output = true;
};
//prepad number length to satisfy width (if specified)
prepad(out_info, placeholder, field_size);
if(sign_char && !sign_char_already_output)
out_char(out_info, sign_char);
while(zero_pad_len--)
out_char(out_info, '0');
do
{
txt_ptr--;
out_char(out_info, *txt_ptr);
}while(txt_ptr != txt);
//postpad number length to satisfy width (if specified)
postpad(out_info, placeholder, field_size);
}
static void print_bin(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_ulong_t uvalue)
{
int number_len = 0;
int zero_pad_len = 0;
prnf_ulong_t temp_ulong = uvalue;
prnf_ulong_t bit = 0;
int precision = 1;
while(temp_ulong)
{
number_len++;
temp_ulong >>= 1;
};
if(placeholder->prec_specified)
precision = placeholder->prec;
if(precision > number_len)
zero_pad_len = precision - number_len;
//prepad number length to satisfy width (if specified)
prepad(out_info, placeholder, number_len + zero_pad_len);
while(zero_pad_len--)
out_char(out_info, '0');
if(number_len)
bit = (prnf_ulong_t)1 << (number_len-1);
while(bit)
{
out_char(out_info, (uvalue & bit) ? '1':'0');
bit >>= 1;
};
//postpad number length to satisfy width (if specified)
postpad(out_info, placeholder, number_len + zero_pad_len);
}
#ifdef PRNF_SUPPORT_FLOAT
// With precision of 3 printable range is +/- 4294967.295
static void print_float(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_float_t value, char postpend)
{
const char* out_msg;
out_msg = determine_float_msg(placeholder, value);
if(out_msg)
print_float_special(out_info, placeholder, out_msg, value);
else
print_float_normal(out_info, placeholder, value, postpend);
}
// Return FLOAT_CASE_x
static const char* determine_float_msg(struct placeholder_struct* placeholder, prnf_float_t value)
{
char* retval = NULL;
int prec;
if(value < 0.0F)
value = -value;
// Determine special case messages
if(value != value)
retval = "NAN";
else if(value > FLT_MAX)
retval = "INF";
// If not NAN or INF
if(!retval)
{
// Multiply by 10^prec to move fractional digits into the integral digits
prec = get_prec(placeholder);
value *= pow10_tbl[prec];
// Check within printable range
if(value >= (prnf_float_t)PRNF_ULONG_MAX)
retval = "OVER";
};
return retval;
}
static void print_float_normal(struct out_struct* out_info, struct placeholder_struct* placeholder, prnf_float_t value, char postpend)
{
uint_least8_t prec;
uint_least8_t number_len = 1;
uint_least8_t radix_pos = -1;
prnf_ulong_t uvalue;
char sign_char;
char txt[INT_BUF_SIZE];
char* txt_ptr;
bool sign_char_already_output = false;
sign_char = determine_sign_char_of_float(placeholder, value);
// Multiply by 10^prec to move fractional digits into the integral digits
prec = get_prec(placeholder);
if(value < 0.0F)
value = -value;
value *= pow10_tbl[prec];
uvalue = round_float_to_ulong(value);
//determine number of digits
number_len = ulong2asc_revdec(txt, uvalue);
txt_ptr = &txt[number_len];
//minimum number of digits is .precision +1 as we always print a 0 on the left of the decimal point
while(number_len < prec+1)
{
number_len++;
*txt_ptr++ = '0';
};
if(prec)
{
number_len++; //+1 for decimal point
radix_pos = number_len - prec - 1;
};
if(sign_char) //+1 for sign character
number_len++;
if(postpend && uvalue) //+1 for engineering notaion?
number_len++;
//If there will be a sign character, and width prepadding is with '0', output the sign character first
if(sign_char && placeholder->flag_zero)
{
out_char(out_info, sign_char);
sign_char_already_output = true;
};
//prepad number length to satisfy width (if specified)
prepad(out_info, placeholder, number_len);
if(sign_char && !sign_char_already_output)
out_char(out_info, sign_char);
do
{
if(radix_pos-- == 0)
out_char(out_info, '.');
txt_ptr--;
out_char(out_info, *txt_ptr);
}while(txt_ptr != txt);
if(postpend && uvalue)
out_char(out_info, postpend);
//postpad number length to satisfy width (if specified)
postpad(out_info, placeholder, number_len);
}
// Floating point special cases
// "NAN" , "-INF" , "INF" , "+INF" , " INF" , "-OVER" , "OVER" , "+OVER" , " OVER"
static void print_float_special(struct out_struct* out_info, struct placeholder_struct* placeholder, const char* out_msg, prnf_float_t value)
{
struct placeholder_struct ph = *placeholder;
int msg_len;
char sign_char;
sign_char = determine_sign_char_of_float(placeholder, value);
ph.type = TYPE_STR;
ph.prec = 1; // Must be non-0 or prepad/postpad may center the msg which is not what we want
msg_len = prnf_strlen(out_msg, false, INT_MAX);
if(sign_char)
msg_len++;
//prepad length to satisfy width (if specified)
prepad(out_info, &ph, msg_len);
if(sign_char)
out_char(out_info, sign_char);
while(*out_msg)
out_char(out_info, *out_msg++);
postpad(out_info, &ph, msg_len);
}
// +, - , <space> or 0
static char determine_sign_char_of_float(struct placeholder_struct* placeholder, prnf_float_t value)
{
char sign_char = 0;
bool neg = (value < 0.0F);
bool nan = (value != value);
// Determine sign character
if(neg)
sign_char = '-';
else if(!nan)
{
if(placeholder->sign_pad)
sign_char = placeholder->sign_pad;
};
return sign_char;
}
#endif //^PRNF_SUPPORT_FLOAT^
static void print_str(struct out_struct* out_info, struct placeholder_struct* placeholder, const char* str, bool is_pgm)
{
int source_len;
int cnt;
source_len = prnf_strlen(str, is_pgm, INT_MAX);
if(placeholder->prec_specified && placeholder->prec < source_len && !is_centered_string(placeholder))
source_len = placeholder->prec;
prepad(out_info, placeholder, source_len);
cnt = source_len;
while(cnt--)
{
out_char(out_info, FMTRD(str));
str++;
};
postpad(out_info, placeholder, source_len);
}
#ifdef PRNF_COL_ALIGNMENT
// print colum alignment \v<col><pad char>
// if \v is encountered without <col> output \v
// if \v is encountered with <col>, but <pad char> is the string terminator, output nothing
static const char* print_col_alignment(struct out_struct* out_info, const char* fmtstr, bool is_pgm)
{
int col = 0;
char pad_char;
bool got_col = false;
got_col = prnf_is_digit(FMTRD(fmtstr));
col = prnf_atoi(&fmtstr, is_pgm);
pad_char = FMTRD(fmtstr);
if(pad_char < 0x20)
pad_char = 0;
if(!got_col)
out_char(out_info, '\v');
else if(pad_char)
{
while(out_info->col < col)
out_char(out_info, pad_char);
fmtstr++;
};
return fmtstr;
}
#endif
static int prnf_strlen(const char* str, bool is_pgm, int max)
{
(void)is_pgm;
int retval = 0;
if(str)
{
while(FMTRD(str) && retval < max)
{
str++;
retval++;
};
};
return retval;
}
static int prnf_atoi(const char** fmtstr, bool is_pgm)
{
(void)is_pgm;
int value = 0;
//Get width
while(prnf_is_digit(FMTRD(*fmtstr)))
{
value *=10;
value += FMTRD(*fmtstr)&0x0F;