snprintf()

Lightweight and with minimal dependencies implementation of snprintf() C function. Especially it is independend from mathematical functions from math.h which are not always available for embedded platforms.

From many years I was using almost unchanged orginal implementation of Alain Magloire (v1.1) but last time I needed replacement of snprintf() function more compliant with standard implementation.

Function prototype

int snprintf(char *string, size_t length, const char *format, ...);

Input parameters

Return values

How to use it

Just copy src/snprintf.c & include/snprintf.h to your project and include snprintf.h in your code.

#include <stdio.h>

#include "snprintf.h"
  
int main(int argc, char *argv[]) {
  const char *hello = "Hello", *world = "World";
  char msg[0x100] = "";

  snprintf(msg, sizeof(msg), "%s %s!", hello, world);
  printf("%s\n", msg);
  
  return 0;
}

In src/tests-snprintf.c & include/tests-snprintf.h you can find set of tests based on MinUnit engine, which can be run by tests_snprintf() function.

#include "tests-snprintf.h"

int main(void) {
  return tests_snprintf();
}

Supported format specifiers

Supportted types

Supported lengths

Supported flags

Authors

• Mirosław Toton, mirtoto@gmail.com
• Alain Magloire, alainm@rcsm.ee.mcgill.ca