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tools/nolibc: allow different write callbacks in printf

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Decouple the formatting logic from the writing logic to later enable
writing straight to a buffer in sprintf().

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Thomas Weißschuh
2025-04-11 11:00:49 +02:00
committed by Thomas Weißschuh
parent bae3cd708e
commit f7b3eeffd4
1 changed files with 17 additions and 4 deletions
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21
tools/include/nolibc/stdio.h
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@@ -208,13 +208,15 @@ char *fgets(char *s, int size, FILE *stream)
}
/* minimal vfprintf(). It supports the following formats:
/* minimal printf(). It supports the following formats:
* - %[l*]{d,u,c,x,p}
* - %s
* - unknown modifiers are ignored.
*/
static __attribute__((unused, format(printf, 2, 0)))
int vfprintf(FILE *stream, const char *fmt, va_list args)
typedef int (*__nolibc_printf_cb)(intptr_t state, const char *buf, size_t size);
static __attribute__((unused, format(printf, 3, 0)))
int __nolibc_printf(__nolibc_printf_cb cb, intptr_t state, const char *fmt, va_list args)
{
char escape, lpref, c;
unsigned long long v;
@@ -304,7 +306,7 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
outstr = fmt;
len = ofs - 1;
flush_str:
if (_fwrite(outstr, len, stream) != 0)
if (cb(state, outstr, len) != 0)
break;
written += len;
@@ -321,6 +323,17 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
return written;
}
static int __nolibc_fprintf_cb(intptr_t state, const char *buf, size_t size)
{
return _fwrite(buf, size, (FILE *)state);
}
static __attribute__((unused, format(printf, 2, 0)))
int vfprintf(FILE *stream, const char *fmt, va_list args)
{
return __nolibc_printf(__nolibc_fprintf_cb, (intptr_t)stream, fmt, args);
}
static __attribute__((unused, format(printf, 1, 0)))
int vprintf(const char *fmt, va_list args)
{