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printf: Partially implement floating point support.

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This commit is contained in:
Solomon Peachy 2019-12-31 00:08:58 -05:00
parent 47fc7071bf
commit dfd5c4ed80
1 changed files with 28 additions and 14 deletions
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42
src/printf.c
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@ -1,5 +1,7 @@
#include "global.h"
//#define WITH_FLOAT // this is busted still
#include <string.h>
uint32_t parse_int(const char *src, int b, int width)
@ -25,7 +27,7 @@ uint32_t parse_int(const char *src, int b, int width)
val += *src - 'A' + 10;
else if (*src >= '0' && *src <= '9')
val += *src - '0';
else
else
break;
skip:
src++;
@ -39,11 +41,12 @@ uint32_t parse_int(const char *src, int b, int width)
}
#ifdef WITH_FLOAT
static int __print_float(char *buf, int buf_len, float i, int width, int width2)
static int __print_float(char *buf, int buf_len, double i, int width, int width2)
{
char *s, *p = buf;
uint8_t use_width = width;
uint8_t use_width2 = width2;
double t;
double u = i;
if (i == 0.0f) {
s = "0.0\0";
@ -60,13 +63,13 @@ static int __print_float(char *buf, int buf_len, float i, int width, int width2)
*s = '\0';
while (i != 0.0f && (!use_width || (width > 0))) {
t = (unsigned int) u % 10.0f;
t = u % 10.0f;
*--s = (char)(t + '0');
u /= 10.0f;
width--;
}
almost:
while (width > 0) {
*buf++ = '0';
@ -74,7 +77,7 @@ almost:
}
strcpy(buf, s);
return strlen(p);
return strlen(p);
}
#endif
@ -83,7 +86,7 @@ static int __print_int(char *buf, int buf_len, int i, int base, int sign, int wi
char *s, *p = buf;
unsigned int u = (unsigned int) i;
uint8_t use_width;
int t;
int t;
use_width = width;
@ -149,7 +152,7 @@ int mcu_vsnprintf(char *str, size_t size, const char *format, va_list ap)
if (*format == 'l') {
format++;
// XXX handle LONG?
}
}
switch(*format) {
case 'c': { /* Character */
char tmp = va_arg(ap, int);
@ -158,7 +161,7 @@ int mcu_vsnprintf(char *str, size_t size, const char *format, va_list ap)
break;
}
case 'u': { /* Unsigned integer */
uint8_t tmp = __print_int(str, size-len,
uint8_t tmp = __print_int(str, size-len,
va_arg(ap, unsigned int),
10, 0, width);
str += tmp;
@ -166,16 +169,16 @@ int mcu_vsnprintf(char *str, size_t size, const char *format, va_list ap)
break;
}
case 'd': { /* Signed integer */
uint8_t tmp = __print_int(str, size-len,
uint8_t tmp = __print_int(str, size-len,
va_arg(ap, int),
10, 1, width);
str += tmp;
len += tmp;
break;
}
}
case 'p': { /* Pointer */
width = 8;
uint8_t tmp = __print_int(str, size-len,
uint8_t tmp = __print_int(str, size-len,
va_arg(ap, unsigned long),
16, 1, width);
str += tmp;
@ -201,7 +204,7 @@ int mcu_vsnprintf(char *str, size_t size, const char *format, va_list ap)
16, 0, width);
str += tmp;
len += tmp;
if (i+1 < MAC_ADDR_LEN) {
*(str++) = ':';
len++;
@ -234,7 +237,18 @@ int mcu_vsnprintf(char *str, size_t size, const char *format, va_list ap)
len++;
}
break;
}
}
#ifdef WITH_FLOAT
case 'f': { /* Floating point */
uint8_t tmp = __print_float(str, size-len,
va_arg(ap, double),
width, width);
str += tmp;
len += tmp;
break;
}
#endif
default: {
// char *ptr = va_arg(ap, char *);
// XXX insert error into output?