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tiny-printf: Support snprintf()

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Add a simple version of this function for SPL. It does not check the buffer
size as this would add to the code size.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Simon Glass
2016-05-14 14:02:53 -06:00
parent 1fb67608b3
commit 5c411d88be
1 changed files with 25 additions and 2 deletions
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27
lib/tiny-printf.c
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@ -16,6 +16,9 @@
static char *bf; static char *bf;
static char zs; static char zs;
/* Current position in sprintf() output string */
static char *outstr;
static void out(char c) static void out(char c)
{ {
*bf++ = c; *bf++ = c;
@ -40,7 +43,7 @@ static void div_out(unsigned int *num, unsigned int div)
out_dgt(dgt); out_dgt(dgt);
} }
int vprintf(const char *fmt, va_list va) int _vprintf(const char *fmt, va_list va, void (*putc)(const char ch))
{ {
char ch; char ch;
char *p; char *p;
@ -133,8 +136,28 @@ int printf(const char *fmt, ...)
int ret; int ret;
va_start(va, fmt); va_start(va, fmt);
ret = vprintf(fmt, va); ret = _vprintf(fmt, va, putc);
va_end(va); va_end(va);
return ret; return ret;
} }
static void putc_outstr(char ch)
{
*outstr++ = ch;
}
/* Note that size is ignored */
int snprintf(char *buf, size_t size, const char *fmt, ...)
{
va_list va;
int ret;
va_start(va, fmt);
outstr = buf;
ret = _vprintf(fmt, va, putc_outstr);
va_end(va);
*outstr = '\0';
return ret;
}