This library provides a tiny string formatting function strfmt for C. It is
basically a (very limited) snprintf replacement intended for embedded applications
with very limited space.
This is a header only library. To use it you have to define STRFMT_IMPLEMENTATION in
exactly one file including the header (before the #include). The header can be included
in other files without the definition.
The function vstrfmt is the corresponding vsnprintf replacement.
const char * strfmt(char* buf, const size_t buflen, const char* format, ...)
const char * vstrfmt(char* buf, const size_t bufLen, const char* format, va_list argp)
Differences to snprintf:
- only
%s(for strings) and%x(for unsigned int, printed as hex) are supported, no flags/precision/aligning - use
%%to print a percent sign - instead of the number of characters written the function returns a pointer to the buffer, allowing to use it directly in a function call (
log(strfmt(...)))
The buffer will always be null terminated (unless buf is NULL or bufLen is 0 in which case NULL is returned).
See the test.c file for example code.
For a more full-featured (and a bit larger) printf/snprintf implementation see here.
Public Domain / CC0