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Date: Wed, 31 May 2023 16:05:43 +0200
From: Jens Gustedt <Jens.Gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: [C23 scanf 3/3] C23: implement wN and wfN specifiers for scanf functions
---
src/stdio/vfscanf.c | 30 ++++++++++++++++++++++++++++++
src/stdio/vfwscanf.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+)
diff --git a/src/stdio/vfscanf.c b/src/stdio/vfscanf.c
index f72ac9c9..f8ace92f 100644
--- a/src/stdio/vfscanf.c
+++ b/src/stdio/vfscanf.c
@@ -41,6 +41,15 @@ static void store_int(void *dest, int size, unsigned long long i)
}
}
+static int getint(unsigned char const**s) {
+ int i=0;
+ if (**s != '0') for (; isdigit(**s); (*s)++) {
+ if (i > INT_MAX/10U || **s-'0' > INT_MAX-10*i) i = -1;
+ else i = 10*i + (**s-'0');
+ }
+ return i;
+}
+
static void *arg_n(va_list ap, unsigned int n)
{
void *p;
@@ -57,6 +66,7 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
{
int width;
int size;
+ int fast16;
int alloc = 0;
int base;
const unsigned char *p;
@@ -150,6 +160,26 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
case 'L':
size = SIZE_L;
break;
+ case 'w':
+ // See if "fast" is requested. Difference is only
+ // relevant for a fast type of minimum width 16.
+ fast16 = SIZE_h;
+ if (*p == 'f') {
+ fast16 = SIZE_def;
+ ++p;
+ }
+ switch (getint(&p)) {
+ default: goto fmt_fail;
+ case 8: size = SIZE_hh; break;
+ case 16: size = fast16; break;
+ case 32: size = SIZE_def; break;
+#if UINTPTR_MAX >= UINT64_MAX
+ case 64: size = SIZE_l; break;
+#else
+ case 64: size = SIZE_ll; break;
+#endif
+ }
+ break;
case 'b': case 'd': case 'i': case 'o': case 'u': case 'x':
case 'a': case 'e': case 'f': case 'g':
case 'A': case 'E': case 'F': case 'G': case 'X':
diff --git a/src/stdio/vfwscanf.c b/src/stdio/vfwscanf.c
index 17f5a2f9..6fe2749c 100644
--- a/src/stdio/vfwscanf.c
+++ b/src/stdio/vfwscanf.c
@@ -41,6 +41,15 @@ static void store_int(void *dest, int size, unsigned long long i)
}
}
+static int getint(wchar_t const**s) {
+ int i=0;
+ if (**s != L'0') for (i=0; iswdigit(**s); (*s)++) {
+ if (i > INT_MAX/10U || **s-L'0' > INT_MAX-10*i) i = -1;
+ else i = 10*i + (**s-L'0');
+ }
+ return i;
+}
+
static void *arg_n(va_list ap, unsigned int n)
{
void *p;
@@ -87,6 +96,7 @@ int vfwscanf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
{
int width;
int size;
+ int fast16;
int alloc;
const wchar_t *p;
int c, t;
@@ -173,6 +183,26 @@ int vfwscanf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
case 'L':
size = SIZE_L;
break;
+ case 'w':
+ // See if "fast" is requested. Difference is only
+ // relevant for a fast type of minimum width 16.
+ fast16 = SIZE_h;
+ if (*p == 'f') {
+ fast16 = SIZE_def;
+ ++p;
+ }
+ switch (getint(&p)) {
+ default: goto fmt_fail;
+ case 8: size = SIZE_hh; break;
+ case 16: size = fast16; break;
+ case 32: size = SIZE_def; break;
+#if UINTPTR_MAX >= UINT64_MAX
+ case 64: size = SIZE_l; break;
+#else
+ case 64: size = SIZE_ll; break;
+#endif
+ }
+ break;
case 'b': case 'd': case 'i': case 'o': case 'u': case 'x':
case 'a': case 'e': case 'f': case 'g':
case 'A': case 'E': case 'F': case 'G': case 'X':
--
2.34.1
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