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Date: Fri, 26 May 2023 21:41:03 +0200
From: Jens Gustedt <Jens.Gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: [C23 printf 2/3] C23: implement the wN length specifiers for printf
These are mandatory for C23 and concern all types for which the
platform has `int_leastN_t` and `uint_leastN_t`. For musl these types
always coincide with `intN_t` and `uintN_t` and are always present for
N equal 8, 16, 32 and 64.
They can be added for general use since all lowercase letters were
previously reserved.
Nevertheless, users that use these modifiers will see a lot of
warnings from compilers in the beginning. This is because the
compilers have not yet integrated this form of a specifier into their
correponding extensions (gcc attributes). So unfortunately also
testing this feature may be a bit noisy for the moment.
The only architecture dependend choice is the type for N == 64, which
may be `long` or `long long`. We just mimick the test that is done in
other places to compare `UINTPTR_MAX` and `UINT64_MAX` to determine
that.
---
src/stdio/vfprintf.c | 18 ++++++++++++++++--
src/stdio/vfwprintf.c | 18 ++++++++++++++++--
2 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
index cbc79783..1a516663 100644
--- a/src/stdio/vfprintf.c
+++ b/src/stdio/vfprintf.c
@@ -33,7 +33,7 @@
enum {
BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
- ZTPRE, JPRE,
+ ZTPRE, JPRE, WPRE,
STOP,
PTR, INT, UINT, ULLONG,
LONG, ULONG,
@@ -57,7 +57,7 @@ static const unsigned char states[]['z'-'A'+1] = {
S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
S('m') = NOARG,
S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
- S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
+ S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE, S('w') = WPRE,
}, { /* 1: l-prefixed */
S('b') = ULONG, S('B') = ULONG,
S('d') = LONG, S('i') = LONG,
@@ -525,8 +525,22 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
st=0;
do {
if (OOB(*s)) goto inval;
+ wpre:
ps=st;
st=states[st]S(*s++);
+ if (st == WPRE) {
+ switch (getint(&s)) {
+ case 8: st = HHPRE; goto wpre;
+ case 16: st = HPRE; goto wpre;
+ case 32: st = BARE; goto wpre;
+#if UINTPTR_MAX >= UINT64_MAX
+ case 64: st = LPRE; goto wpre;
+#else
+ case 64: st = LLPRE; goto wpre;
+#endif
+ default: goto inval;
+ }
+ }
} while (st-1<STOP);
if (!st) goto inval;
diff --git a/src/stdio/vfwprintf.c b/src/stdio/vfwprintf.c
index dbc93f74..4320761a 100644
--- a/src/stdio/vfwprintf.c
+++ b/src/stdio/vfwprintf.c
@@ -26,7 +26,7 @@
enum {
BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
- ZTPRE, JPRE,
+ ZTPRE, JPRE, WPRE,
STOP,
PTR, INT, UINT, ULLONG,
LONG, ULONG,
@@ -50,7 +50,7 @@ static const unsigned char states[]['z'-'A'+1] = {
S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
S('m') = NOARG,
S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
- S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
+ S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE, S('w') = WPRE,
}, { /* 1: l-prefixed */
S('b') = ULONG, S('B') = ULONG,
S('d') = LONG, S('i') = LONG,
@@ -240,8 +240,22 @@ static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_
st=0;
do {
if (OOB(*s)) goto inval;
+ wpre:
ps=st;
st=states[st]S(*s++);
+ if (st == WPRE) {
+ switch (getint(&s)) {
+ case 8: st = HHPRE; goto wpre;
+ case 16: st = HPRE; goto wpre;
+ case 32: st = BARE; goto wpre;
+#if UINTPTR_MAX >= UINT64_MAX
+ case 64: st = LPRE; goto wpre;
+#else
+ case 64: st = LLPRE; goto wpre;
+#endif
+ default: goto inval;
+ }
+ }
} while (st-1<STOP);
if (!st) goto inval;
--
2.34.1
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