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Date: Tue, 30 May 2023 08:55:27 +0200
From: Jens Gustedt <Jens.Gustedt@...ia.fr>
To: musl@...ts.openwall.com,
jens.gustedt@...teo.eu
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 | 28 +++++++++++++++++++++++++---
src/stdio/vfwprintf.c | 28 +++++++++++++++++++++++++---
2 files changed, 50 insertions(+), 6 deletions(-)
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
index cbc79783..265fb7ad 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,
@@ -101,6 +101,12 @@ static const unsigned char states[]['z'-'A'+1] = {
S('o') = UMAX, S('u') = UMAX,
S('x') = UMAX, S('X') = UMAX,
S('n') = PTR,
+ }, { /* 8: w-prefixed */
+ S('b') = UINT, S('B') = UINT,
+ S('d') = INT, S('i') = INT,
+ S('o') = UINT, S('u') = UINT,
+ S('x') = UINT, S('X') = UINT,
+ S('n') = PTR,
}
};
@@ -447,7 +453,7 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
int w, p, xp;
union arg arg;
int argpos;
- unsigned st, ps;
+ unsigned st, ps, width=0;
int cnt=0, l=0;
size_t i;
char buf[sizeof(uintmax_t)*CHAR_BIT+3+LDBL_MANT_DIG/4];
@@ -527,9 +533,25 @@ static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg,
if (OOB(*s)) goto inval;
ps=st;
st=states[st]S(*s++);
+ if (st == WPRE) {
+ if (*s == '0') goto inval;
+ width = getint(&s);
+ }
} while (st-1<STOP);
if (!st) goto inval;
+ if (ps == WPRE) switch (width) {
+ case 8: ps = HHPRE; st = (st == UINT) ? UCHAR : ((st == INT) ? CHAR : PTR); break;
+ case 16: ps = HPRE; st = (st == UINT) ? USHORT : ((st == INT) ? SHORT : PTR); break;
+ case 32: ps = BARE; break;
+#if UINTPTR_MAX >= UINT64_MAX
+ case 64: ps = LPRE; st = (st == UINT) ? ULONG : ((st == INT) ? LONG : PTR); break;
+#else
+ case 64: ps = LLPRE; st = (st == UINT) ? ULLONG : ((st == INT) ? LLONG : PTR); break;
+#endif
+ default: goto inval;
+ }
+
/* Check validity of argument type (nl/normal) */
if (st==NOARG) {
if (argpos>=0) goto inval;
diff --git a/src/stdio/vfwprintf.c b/src/stdio/vfwprintf.c
index dbc93f74..c3e81d2a 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,
@@ -94,6 +94,12 @@ static const unsigned char states[]['z'-'A'+1] = {
S('o') = UMAX, S('u') = UMAX,
S('x') = UMAX, S('X') = UMAX,
S('n') = PTR,
+ }, { /* 8: w-prefixed */
+ S('b') = UINT, S('B') = UINT,
+ S('d') = INT, S('i') = INT,
+ S('o') = UINT, S('u') = UINT,
+ S('x') = UINT, S('X') = UINT,
+ S('n') = PTR,
}
};
@@ -163,7 +169,7 @@ static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_
int w, p, xp;
union arg arg;
int argpos;
- unsigned st, ps;
+ unsigned st, ps, width=0;
int cnt=0, l=0;
int i;
int t;
@@ -242,9 +248,25 @@ static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_
if (OOB(*s)) goto inval;
ps=st;
st=states[st]S(*s++);
+ if (st == WPRE) {
+ if (*s == L'0') goto inval;
+ width = getint(&s);
+ }
} while (st-1<STOP);
if (!st) goto inval;
+ if (ps == WPRE) switch (width) {
+ case 8: ps = HHPRE; st = (st == UINT) ? UCHAR : ((st == INT) ? CHAR : PTR); break;
+ case 16: ps = HPRE; st = (st == UINT) ? USHORT : ((st == INT) ? SHORT : PTR); break;
+ case 32: ps = BARE; break;
+#if UINTPTR_MAX >= UINT64_MAX
+ case 64: ps = LPRE; st = (st == UINT) ? ULONG : ((st == INT) ? LONG : PTR); break;
+#else
+ case 64: ps = LLPRE; st = (st == UINT) ? ULLONG : ((st == INT) ? LLONG : PTR); break;
+#endif
+ default: goto inval;
+ }
+
/* Check validity of argument type (nl/normal) */
if (st==NOARG) {
if (argpos>=0) goto inval;
--
2.34.1
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