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Added support for PRINTF_NO_STACK_BUFFER #226. #227

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Added support for PRINTF_NO_STACK_BUFFER #226. #227

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595cdeb
Added support for PRINTF_NO_STACK_BUFFER #226.
silvio3105 May 30, 2026
bcf8ca6
Updated README.md #226.
silvio3105 May 30, 2026
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,7 @@ Options used both in CMake and in the library source code via a preprocessor def
| SUPPORT_WRITEBACK_SPECIFIER | YES | Support the length write-back specifier (%n) |
| SUPPORT_LONG_LONG | YES | Support long long integral types (allows for the ll length modifier and affects %p) |
| USE_DOUBLE_INTERNALLY | YES | Use the `double` for internal floating-point calculations (rather than using the single-precision `float` type |
| NO_STACK_BUFFER | NO | Define buffers as static |

In the source files themselves, these options become preprocessor definitions with a `PRINTF_` prefix; the boolean ones have value `1` OR `0` for YES or NO respectively; and the aliasing option translates into one of three definitions: `ALIAS_STANDARD_FUNCTION_NAMES_NONE`, `ALIAS_STANDARD_FUNCTION_NAMES_SOFT` or `ALIAS_STANDARD_FUNCTION_NAMES_HARD`.

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8 changes: 8 additions & 0 deletions src/printf/printf.c
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Expand Up @@ -614,7 +614,11 @@ static void print_integer_finalization(output_gadget_t* output, char* buf, print
/* An internal itoa-like function */
static void print_integer(output_gadget_t* output, printf_unsigned_value_t value, bool negative, numeric_base_t base, printf_size_t precision, printf_size_t width, printf_flags_t flags)
{
#ifdef PRINTF_NO_STACK_BUFFER
static char buf[PRINTF_INTEGER_BUFFER_SIZE] = { 0 };
#else
char buf[PRINTF_INTEGER_BUFFER_SIZE];
#endif // PRINTF_NO_STACK_BUFFER
printf_size_t len = 0U;

if (!value) {
Expand Down Expand Up @@ -1156,7 +1160,11 @@ static void print_exponential_number(output_gadget_t* output, floating_point_t n

static void print_floating_point(output_gadget_t* output, floating_point_t value, printf_size_t precision, printf_size_t width, printf_flags_t flags, bool prefer_exponential)
{
#ifdef PRINTF_NO_STACK_BUFFER
static char buf[PRINTF_DECIMAL_BUFFER_SIZE] = { 0 };
#else
char buf[PRINTF_DECIMAL_BUFFER_SIZE];
#endif // PRINTF_NO_STACK_BUFFER
printf_size_t len = 0U;

/* test for special values */
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