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Add formatting binary ``%*_b``

This commit is contained in:
Theo Arends 2024-04-02 12:55:42 +02:00
parent 31fc66f5be
commit d90f0e1cbe
1 changed files with 34 additions and 1 deletions
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35
lib/default/Ext-printf/src/ext_printf.cpp
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@ -157,6 +157,26 @@ char * U64toHex(uint64_t value, char *str) {
}
*/
char * ToBinary(uint32_t value, char *str, uint32_t zeroleads) {
str[32] = 0; // end of string
for (uint32_t i=0; i<32; i++) { // 32 digits in uint32_t
str[31 - i] = (char)(value & 1)+'0';
value = value >> 1;
}
if (zeroleads < 32) {
uint32_t max_zeroes = 32 - zeroleads;
while (max_zeroes) {
if (str[0] == '0') {
memmove(str, str +1, strlen(str));
} else {
break;
}
max_zeroes--;
}
}
return str;
}
char * U64toHex(uint64_t value, char *str, uint32_t zeroleads) {
// str must be at least 17 bytes long
str[16] = 0; // end of string
@ -235,7 +255,7 @@ int32_t ext_vsnprintf_P(char * out_buf, size_t buf_len, const char * fmt_P, va_l
const uint32_t ALLOC_SIZE = 12;
static const char * allocs[ALLOC_SIZE] = {}; // initialized to zeroes
uint32_t alloc_idx = 0;
static char hex[20]; // buffer used for 64 bits, favor RAM instead of stack to remove pressure
static char hex[34]; // buffer used for 64 bits, favor RAM instead of stack to remove pressure
for (; *fmt != 0; ++fmt) {
int32_t decimals = -2; // default to 2 decimals and remove trailing zeros
@ -306,6 +326,19 @@ int32_t ext_vsnprintf_P(char * out_buf, size_t buf_len, const char * fmt_P, va_l
}
}
break;
// '%_b' outputs an unsigned int to binary
case 'b': // Binary, decimals indicates the zero prefill
{
if (cur_val < min_valid_ptr) { new_val_str = ext_invalid_mem; }
else {
if ((decimals < 0) || (decimals > 32)) { decimals = 1; }
ToBinary(*(uint32_t*)cur_val, hex, decimals);
new_val_str = copyStr(hex);
if (new_val_str == nullptr) { goto free_allocs; }
allocs[alloc_idx++] = new_val_str;
}
}
break;
/*
case 'V': // 2-byte values, decimals indicates the length, default 2
{