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made nanoprintf context static to reduce call overhead and size #709

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Merged
adriweb merged 1 commit into from
Feb 27, 2026
Merged

made nanoprintf context static to reduce call overhead and size #709

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1 change: 1 addition & 0 deletions src/libc/printf/nanoprintf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@

#define NANOPRINTF_IMPLEMENTATION
#define NANOPRINTF_VISIBILITY_STATIC
#define NANOPRINTF_STATIC_GLOBALS

/**
* @remarks don't set this above 40, or there is a chance that
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11 changes: 11 additions & 0 deletions src/libc/printf/nanoprintf.h
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Expand Up @@ -761,13 +761,22 @@ typedef struct npf_cnt_putc_ctx {
int n;
} npf_cnt_putc_ctx_t;

#ifdef NANOPRINTF_STATIC_GLOBALS
static npf_cnt_putc_ctx_t pc_cnt;
#endif

static void npf_putc_cnt(int c, void *ctx) {
npf_cnt_putc_ctx_t *pc_cnt = (npf_cnt_putc_ctx_t *)ctx;
++pc_cnt->n;
pc_cnt->pc(c, pc_cnt->ctx); // sibling-call optimization
}

#ifdef NANOPRINTF_STATIC_GLOBALS
static void NPF_PUTC_IMPL(int VAL) { npf_putc_cnt((int)(VAL), &pc_cnt); }
#define NPF_PUTC(VAL) NPF_PUTC_IMPL((int)(VAL))
#else
#define NPF_PUTC(VAL) do { npf_putc_cnt((int)(VAL), &pc_cnt); } while (0)
#endif

#define NPF_EXTRACT(MOD, CAST_TO, EXTRACT_AS) \
case NPF_FMT_SPEC_LEN_MOD_##MOD: val = (CAST_TO)va_arg(args, EXTRACT_AS); break
Expand All @@ -778,7 +787,9 @@ static void npf_putc_cnt(int c, void *ctx) {
int npf_vpprintf(npf_putc pc, void *pc_ctx, char const *format, va_list args) {
npf_format_spec_t fs;
char const *cur = format;
#ifndef NANOPRINTF_STATIC_GLOBALS
npf_cnt_putc_ctx_t pc_cnt;
#endif
pc_cnt.pc = pc;
pc_cnt.ctx = pc_ctx;
pc_cnt.n = 0;
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