spclib

name	spclib
description	This skill should be used when the user asks to "write C code with sp.h", "use spclib", "sp.h API", "single-header C library", "modern C programming", "sp_str_t usage", "sp_alloc memory", "SP_LOG formatting", "dynamic array in C", "hash table in C", "cross-platform C code", or when working with the sp.h single-header C standard library replacement.
license	MIT

spclib - sp.h Programming Guide

sp.h is a single-header C standard library replacement providing modern, type-safe APIs for memory management, strings, containers, IO, and cross-platform system operations.

Core Principles

Always follow these rules when using sp.h:

Never Use	Use Instead
malloc/calloc/realloc	sp_alloc()
const char*	sp_str_t (ptr+len string)
strcmp/strlen	sp_str_equal() / sp_str_len()
printf	SP_LOG()
memset(&obj, 0, sizeof(obj))	SP_ZERO_INITIALIZE()
for(i=0; i<n; i++) on arrays	sp_dyn_array_for() / sp_carr_for()

Quick Reference

Setup

// In ONE C file only:
#define SP_IMPLEMENTATION
#include "sp.h"

Types

• s8/s16/s32/s64 - signed integers
• u8/u16/u32/u64 - unsigned integers
• f32/f64 - floats
• c8 - char (UTF-8)
• sp_str_t - {data, len} string (no null terminator)

String Operations

sp_str_t s = sp_str_lit("hello");     // Compile-time literal
sp_str_t v = sp_str_view(cstr);       // View from C string
bool eq = sp_str_equal(a, b);         // Compare
bool empty = sp_str_empty(s);         // Check empty

Dynamic Arrays

sp_dyn_array(int) arr = SP_NULLPTR;
sp_dyn_array_push(arr, 42);
sp_dyn_array_for(arr, i) { /* use arr[i] */ }

Directory Iteration

// Simple directory traversal
sp_fs_for(dir, it) {
  SP_LOG("Entry: {}", SP_FMT_STR(it.entry.name));
}

// Recursive directory traversal
sp_fs_for_recursive(dir, it) {
  SP_LOG("Path: {}", SP_FMT_STR(it.entry.path));
}

Hash Tables

sp_ht(sp_str_t, s32) map = SP_NULLPTR;
sp_ht_set_fns(map, sp_ht_hash_str, sp_ht_compare_str);
sp_ht_insert(map, sp_str_lit("key"), 100);
s32* val = sp_ht_getp(map, sp_str_lit("key"));

Logging

SP_LOG("Value: {}", SP_FMT_S32(x));
SP_LOG("{:fg green}Success{:reset}", SP_FMT_CSTR(""));

Module Namespaces

Search references/index.md for detailed API signatures:

Namespace	Purpose	Key Functions
sp_str_*	String operations	sp_str_lit, sp_str_equal, sp_str_empty
sp_cstr_*	C string operations	sp_cstr_len, sp_cstr_equal
sp_dyn_array_* / sp_da	Dynamic arrays	sp_dyn_array_push, sp_dyn_array_for
sp_ht_*	Hash tables	sp_ht_insert, sp_ht_getp, sp_ht_for
sp_alloc / sp_free	Memory allocation	sp_alloc, sp_realloc, sp_free
sp_io_*	File IO	sp_io_read_file, sp_io_write_file
sp_fs_*	Filesystem	sp_fs_exists, sp_fs_read, sp_fs_write, sp_fs_for, sp_fs_for_recursive
sp_ps_*	Processes	sp_ps_run, sp_ps_spawn
sp_tm_*	Time	sp_tm_now_ns, sp_tm_sleep_ms
sp_thread_*	Threads	sp_thread_create, sp_thread_join
sp_mutex_*	Mutexes	sp_mutex_init, sp_mutex_lock
sp_env_*	Environment	sp_env_get, sp_env_set
sp_os_*	Platform	sp_os_get_executable_ext
SP_LOG / SP_FMT_*	Logging	SP_LOG, SP_FMT_STR, SP_FMT_S32

Common Patterns

Zero Initialization

my_struct_t obj = SP_ZERO_INITIALIZE();

Error Handling

sp_try(expr);                    // Return if expr fails
sp_try_goto(expr);               // goto sp_try_label if expr fails
sp_try_as_goto(expr, label);     // goto label if expr fails
sp_require(ptr != NULL);         // Return if condition false
SP_ASSERT(condition);            // Assert
SP_FATAL("msg {}", SP_FMT(...)); // Log and exit

Switch Statements

switch (val) {
  case A: { break; }
  case B: { break; }
  default: { SP_UNREACHABLE_CASE(); }
}

Reference Files

For complete API documentation with full function signatures:

• references/index.md - Comprehensive API reference with all function signatures, types, and macros

Examples

Example code demonstrating sp.h usage:

File	Description
references/example/msvc.c	MSVC compiler specific examples
references/example/cli/palette.c	Terminal color palette demo
references/example/cli/prompt.c	Interactive CLI prompt example
references/example/freestanding/jit.c	Just-in-time compilation example
references/example/freestanding/embed.c	Embedded usage example

Finding APIs

When looking for a specific function:

1. Check the namespace table above
2. Search references/index.md for the pattern
3. All public APIs are prefixed with SP_API in the source