mpaland/printf

Health v2 · maintenance only

Adoption not part of the score

3056 stars · 562 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A tiny, dependency-free, thread-safe printf/sprintf/(v)snprintf implementation in a single C file, designed for embedded systems where libc is unavailable or too large. It includes its own fast float/integer conversion routines and extensive compile-time feature trimming options.

Use cases

• replace libc printf in embedded firmware to reduce code size
• add formatted string output to a bare-metal project without linking libc
• get thread-safe, malloc-free sprintf/snprintf in C
• print floats and integers over serial UART on a microcontroller
• disable float or long long support via compile flags to shrink footprint
• use a standard-compliant printf in an IoT or RTOS project

When to choose

• you need printf-family formatting on embedded targets without libc
• code size and no dependencies are critical
• you need reentrant, thread-safe formatting with no static buffers
• you want a mature, well-tested single-file C implementation

When to avoid

• you already link against a full libc with printf
• you need wide-character or locale-aware formatting
• you need a maintained project with frequent updates
• you need C++ iostream-style or extensible custom format specifiers

Facets

library · maturity maintenance

serialization embedded developer-tools embedded-systems developer-tools iot c cpp embedded cross-platform printf sprintf snprintf libc-replacement no-dependencies thread-safe single-file tinyprintf

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